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Academic literature on the topic 'Volcanism'

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Published: 4 June 2021

Last updated: 31 July 2024

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Journal articles on the topic "Volcanism"

Tripathi, C. "Volcanism in Gondwanas." Journal of Palaeosciences 36 (December 31, 1987): 285–89. http://dx.doi.org/10.54991/jop.1987.1587.

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In India the Lower Permian event is marked by a major volcanic episode in the Himalayan belt and rift faulting in the Peninsula which gave rise to various Gondwana basins. The Lower Cretaceous major volcanic episode represented by the Rajmahal Trap represents the termination of Gondwana sedimentation. Lower Permian volcanism is represented by the Panjal Volcanics in Kashmir Basin and its equivalent, the Volcanics in Spiti-Zanskar Basin and Rotung Volcanics (Abor Volcanics) in Arunachal Pradesh. In Karakarom Basin of Ladakh, volcanism is associated with Changtash and Aqtash formations of Permian age. The Agglomeratic Slates in Kashmir are supposed to have originated as explosive volcanism in the form of pyroclastic which was followed later by flows of the Panjal Volcanics represented by subaqueous and subaerial tholeiitic basalt with occasional basaltic, andesitic and rhyolitic volcanics. The Agglomeratic slates are divided into two divisions, the Lower Diamicites and the Upper Pyroclastic. At the base of the Pyroclastic division and at the top of the Diamictite division, we get Eurydesma-Deltopecten Fauna of Lower Permian age. It is thus established that volcanism in Kashmir, Spiti-Zanskar and Ladakh is restricted to Lower Permian only. The sills and dykes associated with the underlying sequence in Syringothyris Limestone and Fenestella Shale in Kashmir, in Lipak and Po Formations in Spiti are related to this volcanism.

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McDOUGALL, IAN. "Age of volcanism and its migration in the Samoa Islands." Geological Magazine 147, no. 5 (February 10, 2010): 705–17. http://dx.doi.org/10.1017/s0016756810000038.

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AbstractPotassium–argon (K–Ar) ages on whole rock samples have been measured on lavas from the subaerial Samoa Islands, which form a broadly linear volcanic chain that extends from the ESE to the WNW for about 360 km. The Manu'a Islands near the southeast limit of the chain exhibit youthful ages, with most <0.4 Ma, in keeping with the geological observations. Tutuila consists of several volcanoes, and previous work yielded a mean K–Ar age of 1.26 ± 0.15 Ma for the shield-building volcanism. Upolu, to the WNW of Tutuila, gives a mean age of 2.15 ± 0.35 Ma for the shield-building phase, represented by the Fagaloa Volcanics, with much of the island covered by significantly younger volcanic rocks. Savai'i, further to the WNW, is dominated by youthful volcanism, extending into historic times. In a restricted area, adjacent to the NE coast of Savai'i, previously thought to have volcanic rocks correlating with the Fagaloa Volcanics of Upolu, the ages are much younger than those on Upolu, lying between 0.32 and 0.42 Ma. Considering only the subaerial volcanism from Ta'u to Upolu, but also including Vailulu'u, the volcanism has migrated in a systematic ESE direction at 130 ± 8 mm a−1 over 300 km in the last 2.2 Ma. This rate is nearly twice that obtained from GPS measurements of Pacific Plate motion of 72 mm a−1 at N64°W in this area. However, if the much older age of shield-building volcanism from the submarine foundations of Savai'i is included, the regression yields a volcanic migration rate of 72 ± 14 mm a−1, in keeping with the measured GPS rate and consistent with a hotspot origin for the island chain. This suggests that the volcanic migration rates determined from the age of subaerial volcanism can be considerably overestimated, and this is now evident in other Pacific Ocean island chains. Clearly, the ages of the main shield-building volcanism from subaerial volcanism are minima, and if the older submarine lavas can be measured, these may yield a migration rate more in keeping with current plate motions.

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Smellie, John L. "Chapter 3.2a Bransfield Strait and James Ross Island: volcanology." Geological Society, London, Memoirs 55, no. 1 (2021): 227–84. http://dx.doi.org/10.1144/m55-2018-58.

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AbstractFollowing more than 25 years of exploration and research since the last regional appraisal, the number of known subaerially exposed volcanoes in the northern Antarctic Peninsula region has more than trebled, from less than 15 to more than 50, and that total must be increased at least three-fold if seamounts in Bransfield Strait are included. Several volcanoes remain unvisited and there are relatively few detailed studies. The region includes Deception Island, the most prolific active volcano in Antarctica, and Mount Haddington, the largest volcano in Antarctica. The tectonic environment of the volcanism is more variable than elsewhere in Antarctica. Most of the volcanism is related to subduction. It includes very young ensialic marginal basin volcanism (Bransfield Strait), back-arc alkaline volcanism (James Ross Island Volcanic Group) and slab-window-related volcanism (seamount offshore of Anvers Island), as well as volcanism of uncertain origin (Anvers and Brabant islands; small volcanic centres on Livingston and Greenwich islands). Only ‘normal’ arc volcanism is not clearly represented, possibly because active subduction virtually ceased atc.4 Ma. The eruptive environment for the volcanism varied between subglacial, marine and subaerial but a subglacial setting is prominent, particularly in the James Ross Island Volcanic Group.

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SIMKIN, T. "Monitoring Volcanism: Volcanic Hazards." Science 245, no. 4913 (July 7, 1989): 83–84. http://dx.doi.org/10.1126/science.245.4913.83.

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Ganelin, A. V., E. V. Vatrushkina, and M. V. Luchitskaya. "Geochemistry and geochronology of cretaceous volcanism of Chauna region, Central Chukotka." Геохимия 64, no. 1 (January 15, 2019): 20–42. http://dx.doi.org/10.31857/s0016-752564120-42.

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New geochronological and geochemical data on the age and composition of Cretaceous volcanism of Palyavaam River basin (Central Chukotka, Chauna region) are presented. First complex is composed of rhyolites, ignimbrites and felsic tuffs of Chauna Group of Okhotsk-Chukotka volcanic belt (OCVB). Second complex is represented by volcanic rocks of latite-shoshonite series of Early Cretaceous age, distinguished as Etchikun’ Formation. Its origin is still debatable. Some researchers refer deposits of Etchikun’ Formation to magmatic stage before OCVB activity. Other authors include in Chauna Group composition. Obtained data indicate heterogeneity of Etchikun’ Fomation volcanics and allow to divide them in two groups. Andesites of the first group (Etchikun’ Formation sensu stricto) have Early Cretaceous age and belong to magmatic stage before OCVB activity. Andesites of the second group correlate in age and composition with OCVB volcanic rocks. They occur at the base of Chauna Group and indicate homodromous character of volcanism evolution in the Central-Chukotka of Okhotsk-Chukotka volcanic belt.

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Smellie, John L. "Chapter 1.2 Antarctic volcanism: volcanology and palaeoenvironmental overview." Geological Society, London, Memoirs 55, no. 1 (2021): 19–42. http://dx.doi.org/10.1144/m55-2020-1.

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AbstractSince Jurassic time (c.200 Ma), Antarctica has had a greater diversity of volcanism than other southern continents. It includes: (1) voluminous mafic and felsic volcanism associated with the break-up of Gondwana; (2) a long-lived continental margin volcanic arc, including back-arc alkaline volcanism linked to slab rollback; (3) small-volume mafic alkaline volcanism associated with slab-window formation; and (4) one of Earth's major continental rift zones, the West Antarctic Rift System (WARS), with its numerous large alkaline central volcanoes. Several of Antarctica's volcanoes are still active. This chapter is a review of the major volcanic episodes and their principal characteristics, in their tectonic, volcanological and palaeoenvironmental contexts. Jurassic Gondwana break-up was associated with large-scale volcanism that caused global environmental changes and associated mass extinctions. The volcanic arc was a major extensional arc characterized by alternating volcanic flare-ups and lulls. The Neogene rift-related alkaline volcanism is dominated by effusive glaciovolcanic eruptions, overwhelmingly as both pāhoehoe- and ‘a‘ā-sourced lava-fed deltas. The rift is conspicuously poor in pyroclastic rocks due to the advection and removal of tephra erupted during glacial intervals. Volcanological investigations of the Neogene volcanism have also significantly increased our knowledge of the critical parameters and development of the Antarctic Ice Sheet.

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Kitsopoulos, K. "MAGMA GENERATION AND MIXING IN THE EARLIEST VOLCANIC CENTRE OF SANTORINI (AKROTIRI PENINSULA). MINERAL CHEMISTRY EVIDENCE FROM THE AKROTIRI PYROCLASTICS." Bulletin of the Geological Society of Greece 43, no. 5 (July 31, 2017): 2625. http://dx.doi.org/10.12681/bgsg.11669.

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Santorini is a dominant expression of magma generation and subsequent volcanism in the Meditereanean area, where a calk-alkaline, high-alumina, basalt-andesite-dacite type of volcanism was expressed from eight centres. The volcanics of the Akrotiri peninsula are considered to be the products of the earliest (Pliocene Pleistocene) volcanic centre. The present study has investigated the mineral chemistry of some major pyrogenic phenocrysts, such as plagioclase and Fe-Ti oxides, of the Akrotiri pyroclatics unit, which have undergone a notable zeolitization procedure. The results are compatible with magma mixing mechanism of a primitive mantle derived, saturated, of mafic composition component with silicic magma in shallow crustal depths.

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Ludden, John, Claude Hubert, and Clement Gariépy. "The tectonic evolution of the Abitibi greenstone belt of Canada." Geological Magazine 123, no. 2 (March 1986): 153–66. http://dx.doi.org/10.1017/s0016756800029800.

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AbstractBased on structural, geochemical, sedimentological and geochronological studies, we have formulated a model for the evolution of the late Archaean Abitibi greenstone belt of the Superior Province of Canada. The southern volcanic zone (SVZ) of the belt is dominated by komatiitic to tholeiitic volcanic plateaux and large, bimodal, mafic-felsic volcanic centres. These volcanic rocks were erupted between approximately 2710 Ma and 2700 Ma in a series of rift basins formed as a result of wrench-fault tectonics.The SVZ superimposes an older volcanic terrane which is characterized in the northern volcanic zone (NVZ) of the Abitibi belt and is approximately 2720 Ma or older. The NVZ comprises basaltic to andesitic and dacitic subaqueous massive volcanics which are cored by comagmatic sill complexes and layered mafic-anorthositic plutonic complexes. These volcanics are overlain by felsic pyroclastic rocks that were comagmatic with the emplacement of tonalitic plutons at 2717 ±2 Ma.The tectonic model envisages the SVZ to have formed in a series of rift basins which dissected an earlier formed volcanic arc (the NVZ). Analogous rift environments have been postulated for the Hokuroko basin of Japan, the Taupo volcanic zone of New Zealand and the Sumatra and Nicaragua arcs. The difference between rift related ‘submergent’ volcanism in the SVZ and ‘emergent’ volcanism in the NVZ resulted in the contrasting metallogenic styles, the former being characterized by syngenetic massive sulphide deposits, whilst the latter was dominated by epigenetic ‘porphyry-type’ Cu(Au) deposits.

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CITRONI, SERGIO B., MIGUEL A. S. BASEI, OSWALDO SIGA JR., and JOSÉ M. DOS REIS NETO. "Volcanism and stratigraphy of the Neoproterozoic Campo Alegre Basin, SC, Brazil." Anais da Academia Brasileira de Ciências 73, no. 4 (December 2001): 581–97. http://dx.doi.org/10.1590/s0001-37652001000400012.

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The depositional succession of the Campo Alegre Basin (Santa Catarina - southern Brazil) was investigated having the evolution of the volcanic activity as background. The different stratigraphic units are interpreted as belonging to different volcanic stages: Bateias Formation, conglomerates and sandstones, related with a pre-volcanic stage; Campo Alegre Group, at the main volcanic stage, with each different formation corresponding to different episodes of volcanism - Rio Negrinho Formation, corresponding to the basic volcanism, Avenca Grande Formation to ignimbritic event, Serra de São Miguel Formation to the acid volcanism and Fazenda Uirapuru Formation, related to an explosive event; Rio Turvo and Arroio Água Fria formations correspond respectively to inner and extra-caldera deposits.

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Griffiths, Chris J., and Richard D. J. Oglethorpe. "The stratigraphy and geochronology of Adelaide Island." Antarctic Science 10, no. 4 (December 1998): 462–75. http://dx.doi.org/10.1017/s095410209800056x.

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The Mesozoic-Cenozoic volcanic arc of the Antarctic Peninsula is represented on Adelaide Island by a sedimentary and volcanic succession intruded by plutons. 40Ar-39 Ar step-heating age spectra have been obtained from volcanic rocks and hornblende separates from sedimentary clasts of plutonic origin. These spectra show evidence for some argon loss, but, in general, have plateau ages which are consistent with the mapped stratigraphy and with other geochronological controls, suggesting that they approximate to original ages. As a result the following events in the evolution of Adelaide Island can be recognized:1) mostly marine Mesozoic sedimentation, 2) Early Cretaceous (c. 141 Ma) plutonism (recorded in clasts from conglomerates), 3) Cretaceous volcanism, 4) Late Cretaceous (possibly Tertiary) sedimentation, 5) Early Tertiary volcanism, which was acidic in eastern outcrops and intermediate elsewhere, and 6) Eocene intermediate volcanism and deposition of arc-derived conglomerates. Volcanism was possibly coeval with known Palaeocene-Eocene plutonic activity on Adelaide Island (part of the Antarctic Peninsula Batholith) and with volcanism of similar age in northern Alexander Island and the South Shetland Islands. The volcanism on Adelaide Island and the South Shetland Islands, at least, was associated with a westward migration of the Antarctic Peninsula arc.

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Dissertations / Theses on the topic "Volcanism"

Smith, R. T. "Eruptive and depositional models for units 3 and 4 of the 1.85 ka Taupo eruption: Implications for the nature of large-scale 'wet' eruptions." Thesis, University of Canterbury. Geological Science, 1998. http://hdl.handle.net/10092/5928.

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Phreatomagmatic eruptions result from the explosive interaction between magma and some external source of water, and produce deposits which are usually distinctive in nature from those of magmatic eruptions. The widespread deposits of large-scale phreatomagmatic eruptions (usually termed Phreatoplinian) are poorly studied relative to their magmatic counterparts and, consequently, current models for large-scale phreatomagmatic volcanism remain speculative. The Hatepe ash and Rotongaio ash (units 3 and 4 of the 1.85 ka Taupo eruption) are two classical widespread phreatomagmatic fall deposits. These have been examined in fine detail and sampled, for the first time, at a mm-scale, with the intention of quantifying vertical and lateral variations within these deposits and improving our understanding of the eruptive mechanisms and depositional processes during large-scale 'wet' eruptions. The Hatepe ash (1.75 km3) is a widespread (>15 000 km2, individual subunit bt values = 4.4 to 5.5 km), multiple-bedded, poorly-sorted pumiceous fall deposit. The fines-rich character and widespread occurrence of ash aggregates in the proximal to medial dispersal areas are indicators of a phreatomagmatic origin. Subunits contain multiple layers with a wide range of dispersal and grain size characteristics, and a number of distinctive primary lithofacies have been defined which characterise the changes in eruptive conditions and main depositional modes during Hatepe volcanism. The predominantly fine grained clasts (Mdø= 3.3-4.5), along with perhaps 20-25 wt.% liquid, were transported and deposited in the form of damp to wet 'mud lumps' and accretionary lapilli. Dispersal was from dense, 'wet' plumes which promoted the cohesion and aggregation of liquid-coated fine particles. This mode of transport and deposition was dominant during relatively long-lived episodes of relatively low discharge rate, with higher water/magma ratios at the vent and liquid/particle ratios in plumes. When magma discharge rate was relatively high and water/magma ratios low, fines-poor, plinian-style deposits (Mdø = -2.2 to 0.63) were produced by discrete particle fall from high (~25-30 km), relatively 'dry' plumes. Minor, short-lived fluctuations in discharge rate produced episodes of mixed discrete and ash aggregate fall which produced poly- and bimodal deposits (Mdø = 2.5-3) in proximal and inner-medial areas. Lateral emplacement by dilute, turbulent pyroclastic density currents was important in the proximal environment. The range and indices of Hatepe ash juvenile clast vesicularities (50-90%, and 75% vesicles, respectively) indicate that fragmentation was driven by magmatic volatiles but that water played some part in quenching. The minimal variation in juvenile clast vesicularity through the deposit and between the facies types indicates that the state of the Hatepe magma remained a uniform foam, and that the mechanism of fragmentation (but not the water/magma ratio) was consistent throughout Hatepe volcanism. Facies analysis and mapping of internal variations in ash dispersal confirm that the Hatepe ash is not the product of simple sustained magma discharge, but was actually the result of a continuous but highly irregular flux, with fluctuations in magma supply, sometimes over very short time intervals, resulting in a range of eruptive styles and depositional modes. The Rotongaio ash (0.8 km3) is a widespread (>10 000 km2, subunit bt values = 2.9 to 5km), poorly-sorted fall deposit with abundant evidence for the important involvement of liquid water at the vent and in the plume. Modes of deposition were similar to the Hatepe ash; dominantly damp to wet mud lump fallout (Mdø= 3.9 to 5.5), but with minor episodes of discrete particle fall (Mdø = -1.1 to 1.9) and mixed discrete and aggregate fall (Mdø= 1.2 to 2.9) caused by fluctuations in discharge rate. An additional depositional mode in medial areas during Rotongaio volcanism was by dilute, turbulent density currents, derived from particle-laden downbursts from the umbrella region of dense, wet, convectively-unstable plumes. Such a process may account for occurrences of cross-stratification in the medial-distal parts of other widespread ash falls. Secondary processes such as fluvial erosion and reworking, and soft-sediment deformation and slurry-flow were important depositional modes that operated syneruptively during Rotongaio (and Hatepe ash) volcanism. The very close association in time and space between primary and secondary lithofacies implies that there was a strong genetic link between the style of primary eruptive processes and the nature and extent of the secondary modification. In many cases the 'secondary' processes formed a continuum with primary depositional processes, influenced by the liquid/particle ratio of ash fallout and inherent to the mode of eruption. Throughout deposition of the Rotongaio ash a delicate balance always existed between primary accumulation, erosion and redeposition. The Rotongaio ash differs from the Hatepe ash, and most other widespread ash fall deposits, in a number of important ways which indicate the Rotongaio ash is not a typical phreatoplinian deposit; 1) it is extremely finely laminated in proximal exposures and many of these beds cannot be traced into the medial environment indicating it is the product of multiple, discrete and non-sustained explosions which dispersed material along a number of axes and with a wide range of thinning rates, 2) juvenile clasts are mostly poorly- to non-vesicular and clast populations span a very wide range of densities (0-65% vesicles) indicating that the Rotongaio magma was partially degassed and heterogeneous (unlike the Hatepe ash and other pumiceous phreatoplinian deposits), and fragmentation was driven not by vesiculation, but largely by external volatiles, 3) the lack of any significant coarse component compared to the Hatepe ash at anyone site supports a fundamentally different mode of fragmentation for Rotongaio volcanism and vent processes which probably involved significant recycling of clasts through the vent. Detailed analysis of the Hatepe ash and Rotongaio ash has provided some interesting insights into the nature of large-scale phreatomagmatic eruptions. Ash dispersal patterns for subunits of the two deposits indicate that 'wet' and 'dry' plumes, even of comparatively small magnitudes (0.02 to 0.8 km3 subunit volumes) behave in distinctive ways which hint at fundamentally different dynamics of dispersal. Assessment of lateral variations in clast size populations suggest the differences between proximal strongly fines-segregated 'dry' facies and the fines-rich 'wet' facies is an artefact controlled mostly by the initial liquid/solid ratio in the plume rather than the mechanism of fragmentation.

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Hellwig, Bridget M. "The viscosity of dacitic liquids measured at conditions relevant to explosive arc volcanism determing the influence of temperature, silicate composition, and dissolved volatile content /." Diss., Columbia, Mo. : University of Missouri-Columbia, 2006. http://hdl.handle.net/10355/4597.

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Thesis (M.S.)--University of Missouri-Columbia, 2006.
The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file viewed on (February 7, 2007) Includes bibliographical references.

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Watson, Sarah Penelope. "Hotspots and volcanism." Thesis, University of Cambridge, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.386840.

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García, Pérez Olaya. "The explosive volcanism of Teide-Pico Viejo volcanic complex, Canary Island." Doctoral thesis, Universitat de Barcelona, 2013. http://hdl.handle.net/10803/130923.

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The explosive events in Teide Pico Viejo (TPV) complex in Tenerife Island (Spain) have traditionally been restricted to the subplinian eruption of Montaña Blanca, which occurred about 2000 years ago. A recent revision of the stratigraphy of TPV shows that phonolitic explosive activity has been significant during the Holocene, with several distinct episodes related to eruptions ranging from Strombolian to sub-plinian. Using field, mineralogical and geochemical stratigraphic correlations, we have identified 11 phonolitic explosive eruptions related to the satellite domes present all around TPV complex. One of the most representative eruptions is that of El Boqueron (5,660 yBP), a dome that generated an explosive event of VEI 3 with a minimum volume of 4-6x107 m3 and produced a plume with a height of up to 9km above sea level (MER 6.9-8.2x105 kg/s, during 9-15 h). The occurrence of these explosive events in the recent eruptive record of TPV is of major importance in evaluating the risk imposed by the volcanic complex on Tenerife. These eruptions have generated a wide range of direct hazards, such as fallout, emplacement of pyroclastic density currents, debris flows, lahars, and rock avalanches, which could occur again in case of a renewal of volcanic activity. The results obtained in our study are relevant to define realistic and precise eruptive scenarios for TPV and to assess its associated hazard, a necessary step in the evaluation and mitigations of volcanic risk in Tenerife
El complejo volcánico Teide Pico Viejo (TPV) es un stratovolcano situado en la isla de Tenerife, Islas Canarias, y ha sido considerado por la UNESCO el sistema volcánico activo más peligroso en Europa. Los eventos explosivos en el complejo TPV se han limitado tradicionalmente a la erupción subplinian de Montaña Blanca, que ocurrió hace unos 2000 años. Una reciente revisión de la estratigrafía muestra que la actividad explosiva fonolítica asociada a TPV ha sido significativa durante el Holoceno, presentado distintos episodios relacionados con erupciones que varían en tamaño de estromboliano a sub-pliniano. A través de las correlaciones estratigráficas obtenidas mediante observaciones de campo y datos de mineralógicos y geoquímicos, se han identificado 11 erupciones explosivas fonolítica relacionados con los domos satélite presentes en todo complejo TPV. Una de las erupciones más representativa es El Boquerón (5660 YBP), un domo que generó un evento explosivo de VEI 3 con un volumen mínimo de 4-6x107 m3 y produjo una columna con una altura de hasta 9 kilometros sobre el nivel del mar ( MER 6.9-8.2x105 kg / s, durante 9-15 h). La ocurrencia de estos eventos explosivos en el reciente registro eruptivo del complejo TPV es de gran importancia para evaluar el riesgo impuesto por el complejo volcánico en Tenerife. Estas erupciones han generado una amplia gama de amenazas directas, como los depósitos de caida, emplazamiento de las corrientes piroclásticas densidad, flujo de derrubios, lahares y avalanchas de roca, lo que podría ocurrir de nuevo en caso de renovación de la actividad volcánica. Los resultados obtenidos en nuestro estudio son relevantes para definir escenarios eruptivos realista y precisos para el complejo TPV y para evaluar su riesgo asociado, un paso necesario en la evaluación y mitigación del riesgo volcánico en Tenerife

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Watt, Sebastian F. L. "Records of volcanism and controls on volcanic processes in southern Chile." Thesis, University of Oxford, 2010. http://ora.ox.ac.uk/objects/uuid:41cf206e-2cef-4108-9267-5e9217aee96d.

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This thesis describes volcanic records from the Andean southern volcanic zone, based on the collection of field data between Calbuco and Puyuhuapi volcanic centres, with a particular focus on the Hualaihue peninsula, combined with existing records from the region as a whole. These data, extending the understanding of the volcanic history of southern Chile, are examined for evidence of spatial or temporal variability, which may be used to explore underlying controls on volcanic processes. All three volcanoes on the Hualaihue peninsula have been active in the Holocene. A large mafic scoria unit from Apagado is unusually primitive, providing a potential window into primary magma generation in the arc. Dynamically similar eruptions occurred at Hornopirén and widely along the regional scale Liquiñe-Ofqui fault zone (LOFZ). Although the Hualaihue centres are closely related, petrological evidence indicates a complex magmatic storage system. Effusive activity is predominant at Yate and Hornopirén, and the tephrostratigraphy of the Hualaihue area is dominated by units from Calbuco volcano, to the north. The 2008 eruption of Chaitén provided an analogue for past large explosive eruptions in the region, with tephra deposition reflecting variable eruption intensity in a changing wind field. The regional tectonic setting and the LOFZ influence dyke ascent, volcano morphology and, as demonstrated at Yate, edifice stability, determining the orientation of collapse. Explosive eruption records over the post-glacial period also indicate a limited response of volcanism to deglaciation, suggesting a control on magma storage arising from changing crustal stress regimes, both at the arc front and along the LOFZ. On short timescales, large earthquakes are shown to influence eruption rate across the arc, implying a triggering role for dynamic seismic stresses. This work demonstrates the existence of a range of external forces affecting Chilean arc volcanism, but the degree to which these are quantifiable is strongly constrained by the quality of the available data.

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Buck, Adrian. "The Mt. Marcella volcanics : middle Triassic convergent margin volcanism in Southeast Queensland." Thesis, Queensland University of Technology, 2008. https://eprints.qut.edu.au/20171/1/Adrian_Buck_Thesis.pdf.

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Triassic igneous rocks in southeast Queensland show a number of subduction related geochemical characteristics. Extensive calc-alkalic granitoids chains characterise the region and define the ancient arc setting. Despite good evidence that an arc was present, Triassic volcanic rocks are relatively sparse in southeast Queensland. The Mt Marcella Volcanics, of the northern Esk Trough are a previously poorly understood piece of the Middle Triassic convergent margin of southeast Queensland. A three stage model is proposed for the eruptive development of the Middle Triassic (245- 230Ma) volcanic succession that involves; 1) The Middle Triassic basalt, comprising coalesced lava flows covering as much as 500km2 with an estimated eruptive volume in the order of 50km3. 2) The Penwhaupell Volcanic Centre, a concentration of inter-bedded lavas and pyroclastic rocks dominated by dacite that forms a volcanic pile exceeding 2km stratigraphic thickness and representing an eruptive volume of approximately 48km3. 3) The Ettiewyn Caldera, representing the catastrophic culmination of the Mt Marcella Volcanics event, with a sequence of caldera out-flow and in-fill andesite ignimbrites and post-caldera lavas with a total eruptive volume in the order of 130km3. The “Penwhaupell Volcanic Centre” and the “Ettiewyn Caldera” are two new sub-divisions and the proposed names, for the lower and upper sequences of the previously undifferentiated Mt Marcella Volcanics. The Mt Marcella Volcanics magma compositions show cogenetic characteristics that define three evolutionary pathways; 1) a mildly alkali series, from basaltic-andesite to trachy-dacite related through fractionation dominated by plagioclase and clinopyroxene 2) an amphibole series, basaltic-andesite to hornblende dacite through fractionation dominated by plagioclase and hornblende under hydrous conditions, and 3) a pyroxene series, from basaltic-andesite to pyroxene andesite through fractionation dominated by plagioclase and pyroxene. Quantitative petrogenetic models generally support the proposed fractional crystallisation pathway, however weaknesses are acknowledged, with good results for the major elements and REE off-set by generally poor results for the LILE. Despite the inconclusive trace element results for the modelled fractionation, strong geochemical similarities and cogenetic relationships have been established. A typical arc-like geochemical signature including a pronounced Nb depletion characterises the Mt Marcella Volcanics. However, the geochemical character within the Middle Triassic volcanic succession reveals an unusual transition from an OIB character of the Middle Triassic basalts, to the Andean arc character of later Mt Marcella Volcanics. The implications of this could have profound impact on our understanding of how southeast Queensland’s Triassic tectonic setting operated by providing support for hotspot activity rather than subduction-driven activity.

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Buck, Adrian. "The Mt. Marcella volcanics : middle Triassic convergent margin volcanism in Southeast Queensland." Queensland University of Technology, 2008. http://eprints.qut.edu.au/20171/.

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Hartley, Margaret Elizabeth. "Post glacial volcanism and magmatism on the Askja volcanic system, North Iceland." Thesis, University of Edinburgh, 2012. http://hdl.handle.net/1842/5845.

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Postglacial activity on the Askja volcanic system, north Iceland, has been dominated by basaltic volcanism. Over 80% of Askja's postglacial basalts fall within a relatively narrow compositional range containing between 4 and 8 wt.% MgO. The 'main series' is further divided into two groups separated by a distinct compositional gap evident in major and trace element concentrations. The most evolved basalts formed by fractional crystallisation within shallow magma reservoirs, followed by the extraction of residual liquid from a semi-rigid, interconnected crystal network. This process is analogous to the formation of melt segregations within single lava flows, and was responsible for generating several small-volume, aphyric basaltic lavas erupted along caldera ring fractures surrounding the Oskjuvatn (Askja lake) caldera in the early 20th century. Further examples of evolved basalt are found throughout Askja's postglacial volcanic record. However, Askja's early postglacial output is dominated by more primitive compositions. Some of the most primitive basalts erupted within the Askja caldera are found in phreatomagmatic tuff cone sequences which crop out in the walls of Oskjuvatn caldera. one such tuff sequence has been dated at between 2.9 and 3.6 ka. This tuff cone shares geochemical source characteristics, such as Nb/La and Nb/Zr, with basaltic tephras erupted during precursory activity to the Plinian-phreatoplinian eruption of 28th-29th March 1875. It may therefore be considered to be compositionally representative of the primitive basaltic magmas supplied to Askja during the postglacial period. The predominance of relatively primitive basalt (6.8 wt.% MgO) within Askia's postglacial lava succession suggests that it did not have a permanent shallow magma chamber during the postglacial period. It is envisaged that the postglacial Askja magmas evolved by a process of polybaric factionation in transient, sill-like magma storage zones located at various levels in the crust. The most primitive magmas erupted directly from deeper reservoirs, while the more evolved magmas experienced longer crustal residence times. The buoyant rise of volatile-enriched melt from these sill-like bodies, without mobilising phenocryst phases, explains the observation that almost all lavas on Askja's eastern and southern lava aprons are essentially aphyric. The 28th-29th March 1975 eruption marked the climax of a volcanotectonic episode on the Askja volanic system lasting from late 1874 to early 1876. Fissure eruptions also occurred at the Sveinagja graben, 45-65 km north of Askja, between February and October 1875, producing the Nyjahraun lava. A strong similarity exists between whole-rock major element concentrations from Myjahraun and the Askja 20th century basalts. This has led to the suggestion that these basalts originated from a common shallow magma reservoir beneath Askja central volcano, with the Nyjahraun eruptions being fed by a lateral dyke extending northwards from Askja. This theory also offers an explanation for the observation that the volume of phyolitic ejecta from 28th-29th March 1875 is significantly less than the volume of Oskjuvatn caldera, which was formed as a result of this eruption. New major and trace element data from whole-rock and glass samples indicated that Nyjahraun and the Askja 20th century basalts did not share a common parental magma. A detailed investigation of historical accounts from explorers and scientists who visited Askja between 1875 and 1932 reveals that Oskjuvatn caldera took over 40 years to reach its current form, and that its size in 1876 was equal to the volume erupted on 28th-29th March 1875. Small injections of magma into an igneous intrusion complex beneath Askja, coupled with background deflation, are sufficient to provide the required accommodation space for continued caldera collapse after 1876. Lateral flow is therefore not required to explain the volume of Oskjuvatn caldera, nor the eruption of evolved basaltic magma on the Askja volcanic system in 1875. It has been conjectured that the Holuhraun lava, located at the southern tip of the Askja volcanic system, was also connected with the 1874-76 Askja volcanotectonic episode. However, major and trace element data from whole-rock samples, glass and melt inclusions receal the Holuhraun is geochemically more similar to basalts erupted on the Bardarbunga-Veidivotn volcanic system than to postglacial basalts from Askja. The division between the 'Askja' and 'Veidivotn' geochemical signatures appears to be linked to east-west-striking lineations in the region south of Askja. This indicates that a particular geochemical signature is not necessarily confined to the tectonic expression of a single volcanic system, and has important implications for the identification and delineation of individual volcanic systems beneath the northwest sector of Vatnajokull.

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Spinks, Karl D. "Rift architecture and Caldera volcanism in the Taupo Volcanic Zone, New Zealand." Thesis, University of Canterbury. Geological Sciences, 2005. http://hdl.handle.net/10092/4944.

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The Taupo Volcanic Zone (TVZ) is investigated to determine the interaction of regional structure and volcanism. A three-tiered approach is employed involving (i) analysis of rift geometry and segmentation in Modem TVZ(<300 ka) from remote sensing and digital topographic data; (ii) fault kinematic data collected along the length of TVZ; and (iii) combining new and existing volcanological data for TVZ. Modem TVZ is a NNE-SSW trending intra-arc rift zone, subject to dextral transtension, and characterised by a segmented axial rift zone with a number of offset and variably oriented rift segments. These segments are subject to varying degrees of extension, and a general correlation exists between the amount of extension and the volume and style of volcanism in each segment. Segments with the highest degrees of extension correspond to the Okataina and Taupo Caldera Complexes in the central rhyolitic zone of Modem TVZ, while segments with a higher degree of dextral transtension correspond to the volumetrically-subordinate andesitic extremities. The influence of the structural framework on the shape and formation of calderas in Modem TVZ has been inferred from remote sensing and ground-based structural analysis. Detailed analysis of caldera structure and geometry in Modem TVZ indicates that caldera evolution is largely a function of caldera location relative to the axial rift zone. Calderas peripheral to the rift are simple, single-event structures, while those located within the axial rift zone are multiple-event caldera complexes with geometries dictated by their coincidence with rift faulting. These results show that in Modem TVZ the type, volume, and spatial distribution of magmatic activity is strongly influenced by rift structure and kinematics. The inter-relationship between rift geometry and caldera-complex development is particularly clear at the intra-rift Okataina Caldera Complex (OCC). OCC is located at a step-over in the rift where local rotation of the extension direction accompanies the development of a major transfer zone. Three main collapse events are spatially concentrated in a zone of orthogonal extension within the transfer zone. The 28 x 22 km OCC is elongate parallel to the extension direction, with a complicated topographic margin largely controlled by regional faulting. Major embayments occur on each side of OCC where it is intersected by adjacent rift segments. These are contiguous with two intra-caldera dome complexes forming two overlapping linear vent zones, which transect the caldera complex. The development of volcanism at OCC records the progressive interaction between offset rift segments and the propagation of overlapping rift segment axes. As rift propagation proceeded, a diffuse zone of volcanism progressively concentrated in the centre of the transfer zone then divided into two spatially restricted eruptive centres as through-going faults became established. Field investigations at OCC reveal a major revision to the eruptive stratigraphy that has implications for the development of the caldera and for hazard assessment in northern TVZ. Kawerau Ignimbrite is a partially welded pumice-rich ignimbrite that fills Puhipuhi Basin on the eastern side of the caldera complex and forms a thick terrace in and around the Kawerau township area. Within Puhipuhi Basin it is ~100 m thick, exposed on clear-felled knolls and locally forms jointed bluffs in thickest sections where it is valley ponded. Originally mapped as Kaingaroa Ignimbrite, it was subsequently considered distinct and renamed Kawerau Ignimbrite by Beresford & Cole (2000) with an accepted age of 240 ka. In Puhipuhi basin the Kawerau Ignimbrite overlies both the ~280 ka Matahina and ~65 ka Rotoiti ignimbrites and also the older tephras of the 43-31 ka Mangaone Subgroup. Whole-rock and glass geochemistry tie the ignimbrite specifically to the 33 ka Unit I eruptive phase of the subgroup, vastly increasing the eruptive volume of that unit and implying caldera collapse in this recent phase of OCC activity. Two pumice compositions are identified, reflecting eruption of two distinct magma bodies. Vertical variation in the ignimbrite records rapid depletion of a subordinate dacitic magma such that pumices of this composition are rare beyond proximal exposures. Lithic and pumice size distribution data indicate a source within OCC to the west of Puhipuhi basin. The residual volume of the ignimbrite is <15 km3, but estimates of the original volume approach 50 km3 when intra-caldera volumes are considered. Kawerau Ignimbrite thus represents the largest eruption from OCC in the last 65 ka since the Rotoiti event, and is the youngest partially-welded ignimbrite in TVZ.

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Carn, Simon Anthony. "Persistent volcanism in Indonesia." Thesis, University of Cambridge, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.624364.

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Books on the topic "Volcanism"

Ollier, Cliff. Volcanoes. Oxford: Basil Blackwell, 1988.

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H, Stauffer Peter, Decker Robert Wayne 1927-, and Wright Thomas L. 1935-, eds. Volcanism in Hawaii. Washington, DC: U.S. Geological Survey, 1987.

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Ollier, Cliff. Volcanoes. Oxford, UK: Blackwell, 1988.

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Schmincke, Hans-Ulrich. Volcanism. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-642-18952-4.

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Bardintzeff, Jacques-Marie. Les volcans. Genève: Editions Minerva, 2004.

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Bardintzeff, Jacques-Marie. Les volcans. Genève: Liber, 1997.

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Bell, Keith, and Jörg Keller, eds. Carbonatite Volcanism. Berlin, Heidelberg: Springer Berlin Heidelberg, 1995. http://dx.doi.org/10.1007/978-3-642-79182-6.

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Robert, Lattanzio, Sadd James, Stansfield David, Corporation for Community College Television., and Magic Lantern Communications, eds. Volcanism [videorecording]. Toronto: CCC Television, 1992.

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Faraone, Domenico. I vulcani e l'uomo: Miti, leggende e storia. Napoli: Liguori, 2002.

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Jean-Claude, Thouret, Chester David K, Ollier Cliff, Joyce B, and International Association of Geomorphology. Working Group on "Volcanic Geomorphology"., eds. Volcanic landforms, processes and hazards. Berlin: Gebrüder Borntraeger, 2005.

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Book chapters on the topic "Volcanism"

Németh, Károly. "Volcanic Geoheritage in the Light of Volcano Geology." In Geoheritage, Geoparks and Geotourism, 1–24. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-07289-5_1.

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AbstractVolcanic geoheritage relates to the geological features of a region that are associated with the formation of a volcanic terrain in diverse geoenvironmental conditions. These features include the volcanic processes, volcanic landforms and/or the eruptive products of volcanism that form the geological architecture of that region. Volcanic geoheritage is expressed through the landscape and how it forms and evolves through volcanic processes on various spatio-temporal scales. In this sense it is directly linked to the processes of how magma released, transported to the surface and fragmented, the styles of eruption and accumulation of the eruptive products. Volcanic geoheritage is directly linked to the natural processes that generated them. Geocultural aspects are treated separately through volcanic geosite identification and their valorization stages. Identification of volcanic geosites, based on various valorization techniques, have been applied successfully in the past decades to many geological heritage elements. Volcanism directly impacts societal, cultural, and traditional development of communities, hence the “living with volcanoes” concept and indigenous aspects and knowledge about volcanism can and should play important roles in these valorization methods through co-development, transdisciplinary approaches by including interconnected scientists in discussions with local communities. Elements of volcanism and volcanic geoheritage benefit of the geoculture of society so volcanic geoheritage sites are ideal locations for community geoeducation where resilience toward volcanic hazard could be explored and applied more effectively than it is done today. Geoparks within volcanic terrains or volcanism-influenced regions should be the flagship conservation, education and tourism sites for this message. Volcanism can be an integral part of processes operating in sedimentary basins. Here volcanic eruptive products and volcanic processes contribute to the sediment fill and geological features that characterize the geoheritage of that region.

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Schmincke, Hans-Ulrich. "Introduction." In Volcanism, 1–12. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-642-18952-4_1.

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Schmincke, Hans-Ulrich. "Strombolian, Hawaiian and Plinian Eruptions and the Mount St. Helens Eruption 1980." In Volcanism, 155–76. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-642-18952-4_10.

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Schmincke, Hans-Ulrich. "Pyroclastic Flows, Block and Ash Flows, Surges and the Laacher See Eruption." In Volcanism, 177–208. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-642-18952-4_11.

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Schmincke, Hans-Ulrich. "Fire and Water." In Volcanism, 209–28. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-642-18952-4_12.

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Schmincke, Hans-Ulrich. "Volcanic Hazards, Volcanic Catastrophes, and Disaster Mitigation." In Volcanism, 229–58. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-642-18952-4_13.

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Schmincke, Hans-Ulrich. "Volcanoes and Climate." In Volcanism, 259–72. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-642-18952-4_14.

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Schmincke, Hans-Ulrich. "Man and Volcanoes: The Benefits." In Volcanism, 273–90. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-642-18952-4_15.

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Schmincke, Hans-Ulrich. "Plate Tectonics." In Volcanism, 13–20. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-642-18952-4_2.

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Schmincke, Hans-Ulrich. "Magma." In Volcanism, 21–34. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-642-18952-4_3.

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Conference papers on the topic "Volcanism"

Зонов, Ю. Б., and О. В. Левченко. "ZONING OF LANDSCAPES AREAS OF THE MODERN VOLCANISM OF KAMCHATKA." In Геосистемы Северо-Восточной Азии. Crossref, 2021. http://dx.doi.org/10.35735/tig.2021.11.81.016.

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В настоящей статье сделана попытка провести зонирование ландшафтов районов современного вулканизма Камчатки и выявить пространства с типовыми природными признаками. Эти признаки напрямую коррелируются со степенью интенсивности и характером проявления современного вулканизма. Рассматривается ландшафтообразующая роль современного вулканизма, которая заключается в модификации ландшафтов различного ранга в зависимости от объёма и типа поступающего вулканического материала. In this article, an attempt is made to zoning the landscapes of the areas of modern volcanism in Kamchatka and to identify spaces with typical natural features. These signs are directly correlated with the degree of intensity and nature of the manifestation of modern volcanism. The landscape-forming role of modern volcanism is considered, which consists in the modification of landscapes of various ranks, depending on the volume and type of incoming volcanic material.

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Satyana, A. H. "Trilogy Of Southeast Sundaland Terranes: Re-Uniting Drifted Terranes of Southeast Sundaland Using Common Marker ff The Late Cretaceous Volcanics to Volcanic-Clastics of The Meratus Mountains, South Sulawesi, And Sumba - Implications For Petroleum Opportunities." In Indonesian Petroleum Association 44th Annual Convention and Exhibition. Indonesian Petroleum Association, 2021. http://dx.doi.org/10.29118/ipa21-g-39.

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Amalgamation and dispersion of terranes characterized the growth and slivering of Southeast Sundaland into the present configuration of central Indonesia. Amalgamation of the Paternoster-West Sulawesi terrane which docked, in mid-Cretaceous time, onto the Southwest Borneo terrane, thus closed the Meso-Tethys Ocean at the Meratus suture. This made Sundaland expand its area to the east and southeast. In the Late Cretaceous time, the Ceno-Tethys oceanic plate subducted beneath Southeast Sundaland, giving rise to coeval volcanism in the Meratus Mountains and the surrounding areas. Dispersion of some terranes in Southeast Sundaland occurred in the Paleogene through successive rifting and the opening of the Makassar Straits and the Flores Sea, with an eastern drift of South Sulawesi and Sumba away from Southeast Kalimantan to their present positions. Prior to the dispersion, the Meratus Mountains, South Sulawesi, and Sumba (called here the Trilogy of Southeast Sundaland) were united or adjacent to each other and underwent similar Late Cretaceous volcanism. The Late Cretaceous Volcanics and/or Volcanic-Clastics are therefore the common marker of their union. Our field studies in 2018-2019 at Sumba, South Sulawesi, and the Meratus Mountains (South Kalimantan) in the program, called the “Trilogy of Southeast Sundaland Terranes,” sampled the Late Cretaceous volcanics/ volcanic-clastics in these areas to prove that they were once united. Petrographic, petrochemical, isotopic, and geochronological data of the rock formations, based on the recent and previous analyses, show that these rocks, in the three terranes, are co-genetic spatially and temporally thus indicating their previous unity. The paired Paleogene dispersions of South Sulawesi from South Kalimantan, and successively Sumba from South Sulawesi, had resulted in rifted structures in the present Makassar Straits, the Flores Sea, and offshore Sumba. The rifted structures contain source rocks, reservoirs, seals, and structural-stratigraphic traps. Oil has been discovered therein, so further exploration is required since these objectives have not been sufficiently explored in the past and are thus still interesting.

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Blatter, Dawnika, Seth Burgess, and Julie M. Donnelly-Nolan. "EARLY PRIMITIVE VOLCANISM AT CLEAR LAKE VOLCANIC FIELD, CA." In Cordilleran Section-117th Annual Meeting-2021. Geological Society of America, 2021. http://dx.doi.org/10.1130/abs/2021cd-363121.

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Bonessi, Jacob M., Tyrone O. Rooney, Andrew LaVigne, Christopher Svoboda, Guillaume Girard, Robert Moucha, Eric Brown, Carol A. Stein, and Seth Stein. "SILICIC VOLCANISM OF THE PORCUPINE VOLCANICS: IMPLICATIONS FOR MAGMA DIFFERENTIATION DURING THE TERMINAL STAGES OF VOLCANISM WITHIN THE MIDCONTINENT RIFT." In GSA Annual Meeting in Indianapolis, Indiana, USA - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018am-321887.

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Guliyev, Ibrahim S. "Mud Volcanism in Azerbaijan." In RECENT GEODYNAMICS, GEORISK AND SUSTAINABLE DEVELOPMENT IN THE BLACK SEA TO CASPIAN SEA REGION. AIP, 2006. http://dx.doi.org/10.1063/1.2190728.

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Hou, Dongmei, Chao Li, Pengyu Gao, Xun Yuan, Xiaolong Zhang, and Zhong Cheng. "Sedimentary Evolution of Delta and Reservoir Distribution Under the Control of a Volcanic System." In ADIPEC. SPE, 2023. http://dx.doi.org/10.2118/215985-ms.

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Abstract The BZ34-9 oilfield is a clastic reservoir discovered in the Oligocene strata in the southern part of the Bohai Bay Basin. The volcanic system here is intermixed with a clastic reservoir that spans more than 1000 meters. In its upper part, it overlies about 2000 meters of Miocene strata. Volcanic activity has influenced the deposition and filling of the lacustrine and played a key role in controlling the distribution of clastic reservoirs. Based on 3D seismic data and lithological data from 74 wells, four types of volcanic were identified and extracted according to seismic sequences. Establish and clearly state the reciprocal relationship between volcanism and sedimentation. The study of volcanic stratigraphic framework reflects the environmental change of volcanoes from terrestrial to marine, which is consistent with the understanding of the sedimentary environment from paleontological and sedimentary facies studies. Small-scale volcanism predates the formation of the early Oligocene strata, and a regional eruption center to the south and east of the BZ34-9 oilfield provides the tectonic setting for the basin evolution. The early Oligocene strata was deposited in a shallow lake environment, thin-bed distributary channels are developed in the near-source facies belt near the central volcano, and thick-bed mouth dams are developed in the far-source facies belt. Volcanoes of this period influenced the distribution of clastic reservoirs by the effusion facies and intrusive facies near conical craters. Water depth becomes deeper when the late Oligocene strata are deposited, thick-bed continuous underwater distributary channels and an estuary dam is developed in the sedimentary area. Volcanic activity was moderate until the last major eruption. During this period, the hydrothermal vent in the far-source facies belt is the main factor affecting the distribution of clastic reservoirs. It is of great significance for the further fine description of reservoirs and regional exploration.

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Ackerson, Michael R., Todd K. Knobbe, Elizabeth Pettitt, E. Bruce Watson, and Morgan F. Schaller. "WHERE VOLCANISM AND THE ATMOSPHERE MEET: GAS COMPOSITIONS OF VOLCANIC PUMICE CLASTS." In GSA Annual Meeting in Indianapolis, Indiana, USA - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018am-323344.

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Streck, Martin J., William McIntosh, and Mark L. Ferns. "CO-CRBG RHYOLITE VOLCANISM REASSESSED." In 68th Annual Rocky Mountain GSA Section Meeting. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016rm-276108.

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King, Scott D. "STABLE HOTSPOT VOLCANISM ON VENUS." In GSA Annual Meeting in Indianapolis, Indiana, USA - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018am-318245.

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McBride, Marie J., Briony Horgan, and Samuel J. Lawrence. "SPECTRAL ANALYSIS OF EXPLOSIVE AND EFFUSIVE VOLCANISM IN THE MARIUS HILLS VOLCANIC COMPLEX." In GSA Annual Meeting in Indianapolis, Indiana, USA - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018am-321659.

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Reports on the topic "Volcanism"

Heiken, G., D. Krier, and M. G. Snow. Intracaldera volcanism and sedimentation - Creede Caldera, Colorado. Office of Scientific and Technical Information (OSTI), June 1997. http://dx.doi.org/10.2172/484542.

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Edwards, B. R., J. K. Russell, R. G. Anderson, and M. Harder. Overview of Neogene to Recent volcanism in the Atlin volcanic district, Northern Cordilleran volcanic province, northwestern British Columbia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2003. http://dx.doi.org/10.4095/214025.

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Jackson, L. E. Pleistocene Subglacial Volcanism near Fort Selkirk, Yukon Territory. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1989. http://dx.doi.org/10.4095/127498.

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Bruce M. Crowe, Frank V. Perry, Greg A. Valentine, and Lynn M. Bowker. Volcanism Studies: Final Report for the Yucca Mountain Project. Office of Scientific and Technical Information (OSTI), December 1998. http://dx.doi.org/10.2172/12111.

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Fallas, K. M., and W. Matthews. Age dating of a bentonite in the Duo Lake Formation, western Mackenzie Mountains, Northwest Territories. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/328830.

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In the Misty Creek Embayment of the western Mackenzie Mountains, Duo Lake Formation locally includes minor volcanic deposits associated with Marmot Formation volcanism. A bentonite layer from an outcrop of graptolitic shale found in NTS map area 106-B, in the upper part of the Duo Lake Formation, was sampled for U-Pb zircon dating. Analytical results yielded a dominant population of grains with a concordia age of 439.8 ± 3.0 Ma, interpreted as the age of deposition. Minor inherited zircon populations yielded ages ranging from approximately 1200 to 2850 Ma. Observed graptolites from the same outcrop likely range from Middle Ordovician to Early Silurian and are compatible with the interpreted U-Pb age of the bentonite. Previously known Middle and Late Ordovician volcanic activity in the Misty Creek Embayment is here expanded to include Early Silurian activity, and serves as a proxy for the timing of active extensional tectonism in the basin.

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Hickson, C. J. Character of volcanism, volcanic hazards, and risk, northern end of the Cascade magmatic arc, British Columbia and Washington State. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1994. http://dx.doi.org/10.4095/203253.

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Klöcking, M., K. Czarnota, D. C. Champion, A. L. Jaques, and D. R. Davies. Spatio-temporal evolution of Australian lithosphere-asthenosphere boundary from mafic volcanism. Geoscience Australia, 2020. http://dx.doi.org/10.11636/135075.

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Valentine, G. A., and J. E. Bossert. Numerical simulation of explosive volcanism and its effects on the atmosphere. Office of Scientific and Technical Information (OSTI), December 1998. http://dx.doi.org/10.2172/334239.

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Mortensen, J. K., R. I. Thorpe, W. A. Padgham, J. E. King, and W J Davis. U-Pb zircon ages for felsic volcanism in Slave Porvince, N.W.T. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1988. http://dx.doi.org/10.4095/126606.

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Crowe, B., F. Perry, M. Murrell, J. Poths, G. A. Valentine, S. Wells, L. Bowker, K. Finnegan, J. Geissman, and L. McFadden. Status of volcanism studies for the Yucca Mountain Site Characterization Project. Office of Scientific and Technical Information (OSTI), February 1995. http://dx.doi.org/10.2172/42463.

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