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Academic literature on the topic 'Igneous intrusives'

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Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Igneous intrusives"

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Feininger, Tomas, and Alan K. Goodacre. "The eight classical Monteregian hills at depth and the mechanism of their intrusion." Canadian Journal of Earth Sciences 32, no. 9 (September 1, 1995): 1350–64. http://dx.doi.org/10.1139/e95-109.

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The eight classical Monteregian hills are monadnocks on the St. Lawrence Lowlands and adjacent Appalachian foothills in a swath that sweeps 80 km eastward from Montréal. Gravity anomalies suggest the presence of about 200 km3 of mafic and ultramafic Monteregian rocks at depth. Mounts Royal, Saint-Bruno, and Rougemont are interpreted to be pluglike intrusions atop large laccoliths that were fed by magma that spread laterally along the buried Precambrian–Paleozoic unconformity. Mounts Saint-Hilaire, Saint-Grégoire, and Yamaska lie at higher stratigraphic levels in flat-lying sedimentary host rocks. These six intrusions filled the lower parts of breccia pipes formed by the explosive upward escape of volatiles. Late-stage settling of the cooling intrusions dragged downward an encircling collar of baked host rocks. The two easternmost hills (Brome and Shefford) are interpreted to be thin intrusive sheets emplaced along Appalachian thrusts. Stepwise emplacement of magma in the thick cover rocks in the east promoted contamination and may account for the presence of quartz-bearing felsic rocks. Igneous rocks along the deeply buried unconformity in the east and felsic rocks, all undetectable by gravity, could add substantially to the total volume of the Monteregians. The absence of Monteregian intrusives west of Montréal (apart from Oka) is explained by the removal through erosion of Paleozoic cover rocks. The Monteregian intrusives developed only in cover rocks; feeders in the Precambrian basement are possibly small and may be covered by Quaternary deposits. Monteregian magmatism was a major event, out of all proportion to the small intrusions presently exposed, and may have emplaced as much as 1000 km3 of igneous rock.
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Dean, Mark T., and Nicholas Turner. "Conodont Colour Alteration Index (CAI) values for the Carboniferous of Scotland." Transactions of the Royal Society of Edinburgh: Earth Sciences 85, no. 3 (1994): 211–20. http://dx.doi.org/10.1017/s0263593300003606.

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AbstractConodont elements from Scottish Carboniferous rocks have been reviewed for Colour Alteration Index(CAI) data, and most values range between 1 and 1·5. Assuming a local average geothermal gradient similar to that of today, the observed and predicted CAI values generally fit well. Only a few of the samples analysed were influenced by local igneous intrusives. The CAI range shown lies within the immature (early dry gas) to mature (perhapsmid-oil window) stages of hydrocarbon generation, and this suggests that burial maturation (where CAI values are 1-5) could account for locally generated oil, where this occurred away from igneous intrusions. Alkali-dolerite and tholeiitic intrusives are, however, widespread in the Midland Valley of Scotland, and an understanding of their thermal effects has implications for both coal and petroleum exploration. The insensitivity of conodonts to low temperatures is noted, and the relevance, application and potential of various other palaeothermometers is discussed. Locally, the qualitative study of spore colour (SCI) appears useful.
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Lynas, B. D. T., C. C. Rundle, and R. W. Sanderson. "A note on the age and pyroxene chemistry of the igneous rocks of the Shelve Inlier, Welsh Borderland." Geological Magazine 122, no. 6 (November 1985): 641–47. http://dx.doi.org/10.1017/s0016756800032040.

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AbstractGeological survey, electron microprobe analyses of clinopyroxenes and isotopic age determinations have revealed that the intrusive dolerites and basic–intermediate lavas of the Shelve Ordovician Inlier are part of a co-magmatic suite which show transitional affinities between tholeiites and alkali basalts. The ages of most of the intrusives are shown to be mid-Ordovician.
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Sparlin, Mark A., and Richard D. Lewis. "Interpretation of the magnetic anomaly over the Omaha Oil Field, Gallatin County, Illinois." GEOPHYSICS 59, no. 7 (July 1994): 1092–99. http://dx.doi.org/10.1190/1.1443665.

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A 40 nanoTesla (nT) magnetic anomaly identified in an aeromagnetic survey over southern Illinois contours as a localized magnetic high on the west flank of a regional magnetic low. This magnetic anomaly is generally coincident with the Omaha Oil Field in northwest Gallatin County, Illinois. It was initially assumed that cultural sources of steel associated with this oil field were the primary source of the magnetic feature; however, similar oil fields overflown by the survey do not exhibit magnetic anomalies in the data set. The Luther Rister et ux ♯1 well, drilled near the apex of the Omaha structural dome, encountered two zones of ultramafic intrusive rock containing 9.0 percent by volume magnetite. These intrusives were identified to be alnöites which are a class of mantle‐derived ultramafic rock that can be associated with the incipient stages of crustal rifting. A ground magnetic survey verified the presence of the anomaly, and provided detailed data for 3-D modeling of the source. Petrophysical evaluations, magnetic susceptibility measurements and thin section modal analysis were made on drill cuttings from the ultramafic intrusives encountered in the Luther Rister ♯1 well. These measurements were made to constrain the 3-D magnetic modeling by the petrophysical characteristics of the source. After removal of the regional magnetic field, the resulting 140 nT residual magnetic anomaly was successfully modeled using two ultramafic sills with an igneous feeder plug. The two igneous sills adequately account for the structural closure exhibited in the Omaha Oil Field and raise the interesting possibility of other hydrocarbon trapping structures generated by intrusives emplaced into the sedimentary section.
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Ritchie, J. D., J. L. Swallow, J. G. Mitchell, and A. C. Morton. "Jurassic ages from intrusives and extrusives within the Forties igneous province." Scottish Journal of Geology 24, no. 1 (June 1988): 81–88. http://dx.doi.org/10.1144/sjg24010081.

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Ogunyele, Abimbola, Olatunde Adegbuyi, Miracle Odindu, and Tunde Erinfolami. "Geochemical Characteristics and Petrogenesis of Basement Rocks in Idoani Area, Ondo State, Southwestern Nigeria." International Journal of Advanced Geosciences 5, no. 2 (October 28, 2017): 102. http://dx.doi.org/10.14419/ijag.v5i2.8377.

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Idoani area of Ondo State is an extension of the Upper Proterozoic Igarra Schist Belt of the Southwestern Nigerian Basement Complex. The area comprises mainly of metasedimentary rocks with subordinate amount of intrusives. Quartz-mica schist, phyllite, quartzite and banded gneiss are the dominant rock types in the area. These metasediments are intruded by the Older granite and other minor intrusives (pegmatite, aplite, dolerite dyke, quartz vein). Idoani rocks, as revealed by petrographic studies, are rich in quartz, alkali and plagioclase feldspars and mica with a low amount of opaque minerals. Geochemical studies and petrochemical variation diagrams show that the rocks are sub-alkaline, medium-K calc-alkaline to shoshonitic, peraluminous, and characterized by intermediate-high silica content and low-moderate amount of mafic oxides. Petrological and geochemical studies revealed that the quartz-mica schist and phyllite are metapelites while the quartzite is a meta-arkose, derived from a granitic – quartz-monzonitic source. The banded gneisses were probably derived from a hybrid sedimentary–igneous protoliths while the granite is of magmatic origin.
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Ridgway, Jeff R., and Mark A. Zumberge. "Deep‐towed gravity surveys in the southern California Continental Borderland." GEOPHYSICS 67, no. 3 (May 2002): 777–87. http://dx.doi.org/10.1190/1.1484521.

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We surveyed two sites in the southern California continental borderland with a newly developed instrument, a towed deep ocean gravimeter—a gravity sensor that can be towed a few tens of meters above the sea floor. During its development phase, we used the instrument to survey two regions off the coast of southern California. The first was along two tracks in the San Diego Trough. The second was over a seamount‐like feature named Emery Knoll. Results of the trough survey reveal a basin with a geometry consistent with seismic data. We observed no significant density contrast across the San Diego Trough fault in the near‐surface sediments. The survey of Emery Knoll shed light on the question of the origin of this structure; modeling the knoll to determine its bulk density suggested a nearly uniform structure surrounded by sedimentary basins with a more massive central intrusive body. Derived densities of 2850 kg/m3 for the knoll and 3050 kg/m3 for the central intrusion assume that no deep unmodeled sources exist directly underneath the knoll. The gravity data favor a model of metamorphic basement rock uplifted and containing igneous intrusives.
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Klötzli, Urs, Jolanta Burda, Qiu-Li Li, Yu Liu, Gyula Jakab, Lucian Ionescu, and Paul Tibuleac. "Petrochronological Evidence for a Three-Stage Magmatic Evolution of the Youngest Nepheline Syenites from the Ditrău Alkaline Massif, Romania." Minerals 12, no. 5 (May 23, 2022): 657. http://dx.doi.org/10.3390/min12050657.

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The Ditrău Alkaline Massif (DAM) is an igneous massif in the Eastern Carpathian Mountains of Romania. Numerous geochronological and geochemical studies have proposed a long formation history (ca. 70 m.y.) of the DAM from Middle Triassic to Cretaceous times, which is hardly reconcilable with geochemical evolutionary models and the geotectonic environment during the Mesozoic in this part of the Eastern Carpathian Mountains. In order to put tighter age constraints on the igneous processes forming the DAM, two nepheline syenites from the so-called Ghiduţ and Lăzarea suites were investigated. Based on field and geochemical evidence, the two rock suites represent the younger part of the DAM intrusives. Detailed zircon characterization, in situ zircon SIMS U-Pb dating, and geochemical modelling were used to establish the timing of zircon crystallization and thus to set time constraints on the igneous formation of these parts of the DAM. The intrusion of the dated Ghiduţ suite sample took place at 232 ± 1 Ma in the Karnium, whereas the Lăzarea suite nepheline syenite sample was intruded at 225 ± 1 Ma in the Norium. Together with published geochemical and geochronological data, three different magmatic events can thus be identified: Ghiduţ suite at 231.1 ± 0.8 Ma, Ditrău suite at 230.7 ± 0.2 Ma, and Lăzarea suite at 224.9 ± 1.1 Ma. Although the ages of the events 1 and 2 are statistically indistinguishable, the combination of geochemical and petrochronological data certainly favor independent intrusion events. Thus, the igneous events forming the younger parts of the DAM encompassed a time span of ca. 13 m.y. Additionally, each igneous event can tentatively be divided in an older syenitic stage and a younger nepheline syenitic one, each with an age difference of some 100,000 years. No indication of any post 215 Ma igneous or hydrothermal activity was found. The new data and interpretation significantly improve our understanding of the temporal and geochemical evolution of the DAM and of alkaline complexes as such, demonstrating that the underlying igneous processes (melt generation, assimilation, fractionation, and the duration of plumbing systems) work on the same time scale for both sorts of magmatic rock suites.
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Nwachukwu, M. A., L. I. Nwosu, P. A. Uzoije, and C. A. Nwoko. "1D resistivity inversion technique in the mapping of igneous intrusives; A step to sustainable quarry development." Journal of Sustainable Mining 16, no. 4 (2017): 127–38. http://dx.doi.org/10.1016/j.jsm.2017.11.001.

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Ukpabi, N., and E. Etuk. "Petrographic Analysis and Total organic content (TOC) of Mudstone Inclusions in Igneous Intrusives in Lower Benue Trough, Nigeria." Advances in Research 3, no. 1 (January 10, 2015): 60–70. http://dx.doi.org/10.9734/air/2015/11962.

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Dissertations / Theses on the topic "Igneous intrusives"

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Pattison, Christopher Ian. "Igneous intrusions in the Bowen Basin." Thesis, Queensland University of Technology, 1990. https://eprints.qut.edu.au/35967/1/35967_Pattison_1990.pdf.

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Igneous intrusions, in the form of stocks, sills and dykes are abundant in the Bowen Basin. They are predominantly Early Cretaceous in age, exclusively epizonal in origin and range in composition from dolerite to granodioriteldacite. All rock units within the basin, up to and including the Clematis Group, are intruded to some degree. This study assesses the distribution, form, petrology and mode of emplacement of plutons, igneous sills and dykes occurring in the Bowen Basin, and considers their relationship to the prevailing structure. The tectonic implications of the findings are then assessed. Igneous sills occur in two geographically distinct domains, one in the northern Bowen Basin and the other in the central Bowen Basin. The sills emanated from pre-existing, north to north-northwest trending reverse faults, and preferentially intruded coal seams. The boundaries to sill intrusion are marked by major northeast trending basement structures. These basement structures occur at regular intervals throughout the basin, and correspond with the localisation of plutonic and dyke activity, anomalous structural disturbance, and changes in the gross structure of the basin. They are interpreted as transfer faults that were inherited from an Early Permian, basin-forming extensional episode. Petrological evidence indicates that the plutons and sills occurring in the northern Bowen Basin are petrogenetically related, and that a progressive variation in their chemistry occurs across the axis of the basin from east to west. Intrusions in the east belong to the calc-alka1ine rock suite, while those in the west belong to the syenitic suite. This transition is inte1preted in terms of increased crustal contamination as the magma migrated from a source area to the east along a buried, shallow-dipping detachment surface that extends under the basin. This detachment was inherited from the above mentioned extensional phase and is intimately linked to structures that penetrate up-section through the basin succession. Reactivation of the transfer faults during the Early Cretaceous initiated the emplacement of dykes, and the synchronous development of northeast trending normal and wrenchstyle faults. The dykes exhibit characteristics that indicate they were self-propagating, and can be regarded as good palaeostress indicators. This phase corresponded with a major compressional event that involved the reactivation of pre-existing thrust structures, deformation of the Folded Zone and eastern margins of the Nebo Synclinorium and Mimosa Syncline, and the rapid preferential uplift of the central Bowen Basin region.
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Newman, Rowena Jane. "Igneous and hydrothermal minerals and textures in the offshore Canterbury Basin." Thesis, University of Canterbury. Geological Sciences, 2015. http://hdl.handle.net/10092/10856.

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The Canterbury Basin is located on a passive margin on the east coast of the South Island, developed by the rifting of the New Zealand continental fragment from Antarctica in the Late Cretaceous. Well cuttings produced during petroleum exploration in the offshore Canterbury Basin have been examined for secondary minerals and textures. Minerals and textures have been identified primarily from optical examination in reflected light, with a particular focus on producing high-resolution images. Additional identifications are made using thin sections, SEM, XRD and XRF analysis. The focus of this study is the Clipper-1 well in the Clipper sub-basin as it contains the most abundant mineralisation and covers the full depth of the Canterbury Basin sedimentary sequence. Examination of cuttings from this well has revealed intrusive igneous carbonates and native metals including iron, aluminium and copper. The trace element concentrations in the igneous carbonates indicates they are derived from crustal material. Textures indicating fluidisation and recrystallisation of sedimentary material are also present. The proposed mechanism for producing these unusual mineral assemblages is a late Pliocene or younger mafic intrusion into the schist basement of the Canterbury Basin. The igneous carbonates are inferred to be derived from melting of carbonates in the schist. The native metals have been produced from melt due to highly reducing conditions produced by interaction of the intrusion with coal and limestone. The combination of native metals and igneous carbonates with a conspicuous absence of typical silicate igneous rocks is inferred to represent a new type of intrusive environment that has not previously been described in the scientific literature.
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Burns, Claire Elizabeth Graham. "Intrusive igneous control on groundwater in the Triassic sandstones of Northern Ireland." Thesis, Queen's University Belfast, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.669657.

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This thesis describes the processes adopted to form the major conclusion that igneous dykes that traverse the Belfast Groundwater Body impede the movement of groundwater in the aquifer to a significant extent. Chapter one introduces the project and its purpose. Chapters two and three are to a large extent literature based, with Chapter two focusing on generic techniques and examples of relevant research on an international scale, where Chapter three focuses on literature specific to the study are" and facilitates a discussion of aquifer behaviour and the formation of an initial conceptual model for groundwater flow. Chapter four describes the re-appraisal of the geological model for the study area using a recently published airborne magnetic geophysical dataset (Tellus). The progression of this Chapter sees the geological model described in the context of the hydrogeological behaviour of the study area, and a discussion at the end facilitates the description of a geological conceptual model of an igneous dyke and an improved understanding of the processes controlling groundwater movement in the Sherwood Sandstone aquifer. Chapter five uses the conceptual understanding developed from previous chapters to construct a numerical model in FeFlow as a tool to assess aquifer sensitivities. The model described progresses from the most basic homogeneous and isotropic representation of the groundwater flow system, and progresses through nine scenarios to be inclusive of homogeneity (transsmissivity and recharge), homogeneous vertical anisotropy, and with the inclusion of three-tier transmissive igneous dyke zones. Chapter six discusses the findings of the research, drawing comparisons from literature, Tellus, and numerical modelling. The discussion includes the schematic understanding of groundwater movement through the aquifer Inclusive of igneous dykes under various pressures. The discussion ends with some recommendations for the implementation of the conceptual model within an industrial and regulatory context. Chapter seven states the major conclusions formed from the research, and makes recommendations for future work.
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Wigley, Rochelle Anne. "The geochemistry of the Karoo igneous volcanic and intrusive rocks of Botswana." Master's thesis, University of Cape Town, 1995. http://hdl.handle.net/11427/21335.

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Bibliography: pages 183-191.
The Mesozoic basalts and dolerites of Botswana underlie an estimated area of 150 000km2 and form part of the Karoo Igneous Province of southern Africa. The distribution of Karoo basalts in Botswana is limited essentially to three main sub-basins, the Central Kalahari Subbasin, northern Botswana and the Tuli Syncline and a major dyke swarm, with a WNW strike, extends across Botswana from the Namibian to Zimbabwean borders. This dissertation is a reconnaissance study which concentrates on the recognition and definition of distinct geocheinical sub-groups within the Karoo volcanic and intrusive rocks of · Botswana. 128 new whole rock samples were analyzed for major and trace element concentrations, in addition to the 70 whole rock analyses from Botswana which were available in the UCT database.· Mineral analyses and rare earth element compositions for selected samples are also presented. The basalts and dolerites of Botswana are assigned to one of the three geochemical lineages, i.e. the low-K20, the high-K20 and the felsite lineages on the basis of Si02, MgO and K20 concentrations. A number of distinct geochemical sub-groups· are recognised within these lineages according to whole rock compositions, normative mineralogy, petrography and outcrop character. The low-K20 lineage is subdivided into two main sub-groups on the basis of the Ti02 and Zr concentrations, i.e. the LTZ- and HTZ-type basalt and dolerite sub-groups. The LTZtype basalt sub-group (with ~2% Ti02 and ~250ppm Zr) represents the bulk of the Botswana dataset where the LTZ basalts of Botswana are shown to be lateral equivalents to the Lesotho Formation basalts of the Central Karoo area, considerably expanding the known outcrop area of this basalt type. Two dolerites are the only samples of intrusive equivalents of this voluminous LTZ basalt type in Botswana.,
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Al-Jawadi, A. F. "Minor igneous intrusions of the Lake District : geochronology, geochemistry and petrology." Thesis, University of Newcastle Upon Tyne, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376308.

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Buick, Ian S. "The petrology and geochemistry of granitic rocks from the Entia domal structure, Harts Range, eastern Arunta Block, Central Australia /." Title page, contents and abstract only, 1985. http://web4.library.adelaide.edu.au/theses/09SM/09smb932.pdf.

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Christodoulou, C. "Petrology of the plutonic rocks of the Macquarie Island Complex /." Title page, contents and abstract only, 1990. http://web4.library.adelaide.edu.au/theses/09PH/09phc556.pdf.

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Miggins, Daniel Paul. "Temporal and geochemical insights related to volcanic and plutonic activity within Big Bend National Park, Texas." To access this resource online via ProQuest Dissertations and Theses @ UTEP, 2009. http://0-proquest.umi.com.lib.utep.edu/login?COPT=REJTPTU0YmImSU5UPTAmVkVSPTI=&clientId=2515.

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Wilson, Kelly. "RARE EARTH ELEMENTS AT HICKS DOME, SOUTHERN ILLINOIS, THEIR MODE OF MINERALIZATION AND RELATIONSHIP WITH IGNEOUS INTRUSIONS." OpenSIUC, 2019. https://opensiuc.lib.siu.edu/theses/2581.

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Rare earth elements (REE) are an increasingly important group of metals due to their role in the development of modern technologies. Despite being abundant within the Earth’s crust recoverable ores are uncommon, and their mineralization isn’t as well understood as other abundant ore types. In this work, the mineralization of REE occurring in outcrop samples at Hicks Dome, a cryptoexplosive feature that resides in the Wauboukigou Alnöite Province in southeastern Illinois, was studied to determine the mode of mineralization and the origin of the REE. Xenotime-(Y) was identified with a scanning electron microscope in an intrusive breccia and emplaced during or shortly after the uplift which created the oval doming of the Paleozoic section. Whole rock REE concentrations from ultramafic dikes at Hicks Dome closely match global averages of lamprophyres and carbonatites, with a steep La to Lu slope, and enrichment of light rare earth elements. Hicks Dome has unique characteristics relative to the other intrusions in the Province, such as elevated REE, Th, and doming. These traits indicate that the dome was more closely related to an intrusive body at depth that sourced heat, volatile gases, and a suite of rare elements. Based on these data, the REE mineralization and thorium associated with the siliceous breccia is directly related to the alkaline ultramafic intrusion at Hicks Dome. The volatile rich, hot fluids emanating from the ultramafic magma supplied REE and thorium were mixed with the regional fluids responsible for the IKFD.
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Hulley, Vierah. "Reactions between country rock xenoliths and the magma of Uitkomst Complex, with implications for the origin of the sulphide mineralisation." Pretoria : [s.n.], 2005. http://upetd.up.ac.za/thesis/available/etd-05282008-101011.

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Books on the topic "Igneous intrusives"

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Bateman, Paul Charles. Cowtrack Mountain and Glass Mountain quadrangles, California and Nevada--analytic data. [Reston, Va.?]: Dept. of the Interior, U.S. Geological Survey, 1987.

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Bateman, Paul Charles. Cowtrack Mountain and Glass Mountain quadrangles, California and Nevada--analytic data: Modal and chemical data on the granitic rocks of the Cowtrack Mountain and Glass Mountain quadrangles. Washington: U.S. G.P.O., 1988.

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Robb, L. J. Deuteric alteration and uranium mineralization processes in leucogranite intrusions from the Namaqualand Metamorphic Complex. Johannesburg: University of the Witwatersrand, 1985.

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Pattison, David R. M. The Ballachulish Igneous Complex and aureole: A field guide. Edinburgh: Edinburgh Geological Society, 2001.

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V, Vlasov G., and Institut tektoniki i geofiziki (Rossiĭskai͡a︡ akademii͡a︡ nauk), eds. Subvulkanicheskie intruzii kislogo sostava: Morfologii͡a︡, fat͡s︡ialʹnyĭ sostav, petrologii͡a︡, metallogenii͡a︡. Moskva: "Nauka", 1994.

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služba, Česká geologická, and International Union of Geodesy and Geophysics. General Assembly, eds. Eurogranites 2015: 'Variscan plutons of the Bohemian Massif' : post-conference field trip following the 26th IUGG General Assembly in Prague, July 3rd-8th, 2015. Prague: Czech Geological Survey, 2015.

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Wang, Te-tzu. The mesozoic volcanic-intrusive complexes and their metallogenic relations in east China. Beijing, China: Science Press, 1996.

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Reynolds, Richard L. Paleomagnetic and ⁴⁰Ar/³⁹Ar results from the Grant intrusive breccia and comparison to the Permian Downeys Bluff sill--evidence for Permian igneous activity at Hicks Dome, southern Illinois Basin. Washington: U.S. G.P.O., 1997.

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Curtis, Peter. The geology of younger intrusive alkali complexes in the southwestern Nuba Mountains, Sudan: Results of reconnaissance mapping. Hannover: Bundesanstalt für Geowissenschaften und Rohstoffe, 1985.

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Brooks, Charles Kent. The East Greenland rifted volcanic margin. Copenhagen: Geological Survey of Denmark and Greenland, 2011.

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Book chapters on the topic "Igneous intrusives"

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Faure, Gunter. "Differentiated Gabbro Intrusives." In Origin of Igneous Rocks, 351–78. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-662-04474-2_7.

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Scheffers, Anja M., Simon M. May, and Dieter H. Kelletat. "Igneous Intrusive Landforms." In Landforms of the World with Google Earth, 57–74. Dordrecht: Springer Netherlands, 2015. http://dx.doi.org/10.1007/978-94-017-9713-9_3.

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Park, R. G. "Emplacement of igneous intrusions." In Foundations of Structural Geology, 94–99. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-011-6576-1_11.

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Mason, Roger. "Metamorphism associated with igneous intrusions." In Petrology of the metamorphic rocks, 57–93. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-010-9603-4_3.

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Mason, Roger. "Metamorphism associated with igneous intrusions." In Petrology of the metamorphic rocks, 57–93. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-017-2590-3_3.

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McBirney, Alexander R. "Constitutional Zone Refining of Layered Intrusions." In Origins of Igneous Layering, 437–52. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-017-2509-5_13.

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Naldrett, A. J., G. Cameron, G. Gruenewaldt, and M. R. Sharpe. "The Formation of Stratiform PGE Deposits in Layered Intrusions." In Origins of Igneous Layering, 313–97. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-017-2509-5_10.

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Robins, B., L. Haukvik, and S. Jansen. "The Organization and Internal Structure of Cyclic Units in the Honningsvåg Intrusive Suite, North Norway: Implications for Intrusive Mechanisms, Double-Diffusive Convection and Pore-Magma Infiltration." In Origins of Igneous Layering, 287–312. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-017-2509-5_9.

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Irvine, T. N. "Layering and Related Structures in the Duke Island and Skaergaard Intrusions: Similarities, Differences, and Origins." In Origins of Igneous Layering, 185–245. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-017-2509-5_6.

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Cruden, A. R., K. J. W. McCaffrey, and A. P. Bunger. "Geometric Scaling of Tabular Igneous Intrusions: Implications for and." In Physical Geology of Shallow Magmatic Systems, 11–38. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-14084-1_1000.

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Conference papers on the topic "Igneous intrusives"

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Mulholland, P., S. Testa, and M. Woodfin. "Tertiary Igneous Intrusives - Establishing Their Presence to Reduce Exploration Risk." In 61st EAGE Conference and Exhibition. European Association of Geoscientists & Engineers, 1999. http://dx.doi.org/10.3997/2214-4609.201407628.

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Kershaw, Charles Thomas, Daniel R. Hummer, and F. Brett Denny. "MINERALOGY OF IGNEOUS INTRUSIVES AT HICK’S DOME AND THEIR ECONOMIC VIABILITY." In 54th Annual GSA North-Central Section Meeting - 2020. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020nc-348163.

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Rodriguez, C., J. Hernandez, S. Villarroel, K. Lyons, E. Galvan, and M. El-Toukhy. "Potential Igneous Intrusions Offshore Mexico: Exploration Significance." In 81st EAGE Conference and Exhibition 2019. European Association of Geoscientists & Engineers, 2019. http://dx.doi.org/10.3997/2214-4609.201901552.

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Karvinen, S., A. Heinonen, and C. Beier. "Apatite as a tracer for magmatic-hydrothermal ore-forming processes." In Project KO5125 ARLIN Arctic Layered Intrusions as a Source of Critical Metals for Green Economy European Neighbourhood Instrument Cross-Border Cooperation Programme Kolarctic 2014-2020. GI KSC RAS, 2021. http://dx.doi.org/10.31241/arlin.2021.019.

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This project focuses on the trace element chemistry of igneous apatite in various magmatic systems with the use of in situ analytical techniques. The composition of apatite may possibly be used as a tracer for various magmatic-hydrothermal processes due to the breadth of chemical substitutions possible within the structure. Apatite is found in many mineralized layered intrusions as a minor phase. Apatite may be utilized in the tracking of metasomatic fluids in layered intrusions or in geochronological studies in the absence of other commonly used phases i.e. zircon. Apatite accumulations can be exploited economically for phosphorus and possibly for rare earth elements as well.
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Cariddi, Bruna, Vincenza Guarino, Alberto Zanetti, Vincenzo Morra, and Leone Melluso. "A Hidden Intrusive Complex Below Somma-Vesuvius: Insights from Igneous Xenoliths." In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.322.

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Pena, Victor, Supratik Sarkar, Kurt J. Marfurt, and Sergio Chávez‐Pérez. "Mapping igneous intrusive and extrusive from 3D seismic in Chicontepec Basin, Mexico." In SEG Technical Program Expanded Abstracts 2009. Society of Exploration Geophysicists, 2009. http://dx.doi.org/10.1190/1.3255831.

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Biasi, Joseph, Sarah Slotznick, Leif Karlstrom, Samantha Lofman, and London Warburton. "A NOVEL METHOD TO DETERMINE THE TRANSPORT LIFETIMES OF IGNEOUS INTRUSIONS." In GSA Connects 2022 meeting in Denver, Colorado. Geological Society of America, 2022. http://dx.doi.org/10.1130/abs/2022am-381006.

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Xu, Dekui, Gang Peng, Gongli Liu, Xiaojie Zhang, and Zongyu Zhen. "The application of phase versus offset information on prediction for intrusive igneous rock." In SEG Technical Program Expanded Abstracts 2017. Society of Exploration Geophysicists, 2017. http://dx.doi.org/10.1190/segam2017-17653840.1.

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Robertson, Paul, Brock Howell, Jack Wells, Jacob Siebach, Christopher Sovine, Jared Abbott, Daniel H. Natter, et al. "GEOPHYSICAL MAPPING OF IGNEOUS INTRUSIONS IN THE EASTERN UINTA MOUNTAINS, NORTHEASTERN UTAH." In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-282386.

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McClay*, Kenneth R., and Nicola Scarselli. "Igneous Intrusions and Volcanic Complexes in the North West Shelf Passive Margin." In International Conference and Exhibition, Melbourne, Australia 13-16 September 2015. Society of Exploration Geophysicists and American Association of Petroleum Geologists, 2015. http://dx.doi.org/10.1190/ice2015-2209057.

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Reports on the topic "Igneous intrusives"

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Currie, K. L. Geology of Fogo Island, Newfoundland - a study of the form and emplacement of igneous intrusions. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1997. http://dx.doi.org/10.4095/208656.

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Hervet, M., O. van Breemen, and M. D. Higgins. U-Pb igneous crystallization ages of intrusive rocks near the southeastern margin of the Lac-St-Jean Anorthosite Complex, Grenville Province, Quebec. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1994. http://dx.doi.org/10.4095/195177.

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Pantaleone, Scott, and Shuvajit Bhattacharya. Core-based reservoir and geomechanical properties of the Tyonek Formation, Hemlock Conglomerate, Talkeetna Formation, and the Mesozoic igneous intrusive complex (basement) in the Cook Inlet basin, Alaska. Alaska Division of Geological & Geophysical Surveys, March 2020. http://dx.doi.org/10.14509/30428.

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Williamson, M. C., B. M. Saumur, S. E. Grasby, and T. Hadlari. Field studies of High Arctic Large Igneous Province (HALIP) intrusions, Axel Heiberg Island and Ellesmere Island, Nunavut (GEM-2 report of activities, western Arctic region). Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2017. http://dx.doi.org/10.4095/306303.

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Tweet, Justin S., Vincent L. Santucci, Kenneth Convery, Jonathan Hoffman, and Laura Kirn. Channel Islands National Park: Paleontological resource inventory (public version). National Park Service, September 2020. http://dx.doi.org/10.36967/nrr-2278664.

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Channel Island National Park (CHIS), incorporating five islands off the coast of southern California (Anacapa Island, San Miguel Island, Santa Barbara Island, Santa Cruz Island, and Santa Rosa Island), has an outstanding paleontological record. The park has significant fossils dating from the Late Cretaceous to the Holocene, representing organisms of the sea, the land, and the air. Highlights include: the famous pygmy mammoths that inhabited the conjoined northern islands during the late Pleistocene; the best fossil avifauna of any National Park Service (NPS) unit; intertwined paleontological and cultural records extending into the latest Pleistocene, including Arlington Man, the oldest well-dated human known from North America; calichified “fossil forests”; records of Miocene desmostylians and sirenians, unusual sea mammals; abundant Pleistocene mollusks illustrating changes in sea level and ocean temperature; one of the most thoroughly studied records of microfossils in the NPS; and type specimens for 23 fossil taxa. Paleontological research on the islands of CHIS began in the second half of the 19th century. The first discovery of a mammoth specimen was reported in 1873. Research can be divided into four periods: 1) the few early reports from the 19th century; 2) a sustained burst of activity in the 1920s and 1930s; 3) a second burst from the 1950s into the 1970s; and 4) the modern period of activity, symbolically opened with the 1994 discovery of a nearly complete pygmy mammoth skeleton on Santa Rosa Island. The work associated with this paleontological resource inventory may be considered the beginning of a fifth period. Fossils were specifically mentioned in the 1938 proclamation establishing what was then Channel Islands National Monument, making CHIS one of 18 NPS areas for which paleontological resources are referenced in the enabling legislation. Each of the five islands of CHIS has distinct paleontological and geological records, each has some kind of fossil resources, and almost all of the sedimentary formations on the islands are fossiliferous within CHIS. Anacapa Island and Santa Barbara Island, the two smallest islands, are primarily composed of Miocene volcanic rocks interfingered with small quantities of sedimentary rock and covered with a veneer of Quaternary sediments. Santa Barbara stands apart from Anacapa because it was never part of Santarosae, the landmass that existed at times in the Pleistocene when sea level was low enough that the four northern islands were connected. San Miguel Island, Santa Cruz Island, and Santa Rosa Island have more complex geologic histories. Of these three islands, San Miguel Island has relatively simple geologic structure and few formations. Santa Cruz Island has the most varied geology of the islands, as well as the longest rock record exposed at the surface, beginning with Jurassic metamorphic and intrusive igneous rocks. The Channel Islands have been uplifted and faulted in a complex 20-million-year-long geologic episode tied to the collision of the North American and Pacific Places, the initiation of the San Andreas fault system, and the 90° clockwise rotation of the Transverse Ranges, of which the northern Channel Islands are the westernmost part. Widespread volcanic activity from about 19 to 14 million years ago is evidenced by the igneous rocks found on each island.
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Dare, S. A. S., D. E. Ames, P. C. Lightfoot, S. J. Barnes, and G. Beaudoin. Mineral chemistry and supporting databases for TGI4 project on "Trace elements in Fe-oxides from fertile and barren igneous complexes: Investigating their use as a vectoring tool in the intrusions that host Ni-Cu-PGE deposits". Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2014. http://dx.doi.org/10.4095/293640.

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Harris, L. B., P. Adiban, and E. Gloaguen. The role of enigmatic deep crustal and upper mantle structures on Au and magmatic Ni-Cu-PGE-Cr mineralization in the Superior Province. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/328984.

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Aeromagnetic and ground gravity data for the Canadian Superior Province, filtered to extract long wavelength components and converted to pseudo-gravity, highlight deep, N-S trending regional-scale, rectilinear faults and margins to discrete, competent mafic or felsic granulite blocks (i.e. at high angles to most regional mapped structures and sub-province boundaries) with little to no surface expression that are spatially associated with lode ('orogenic') Au and Ni-Cu-PGE-Cr occurrences. Statistical and machine learning analysis of the Red Lake-Stormy Lake region in the W Superior Province confirms visual inspection for a greater correlation between Au deposits and these deep N-S structures than with mapped surface to upper crustal, generally E-W trending, faults and shear zones. Porphyry Au, Ni, Mo and U-Th showings are also located above these deep transverse faults. Several well defined concentric circular to elliptical structures identified in the Oxford Stull and Island Lake domains along the S boundary of the N Superior proto-craton, intersected by N- to NNW striking extensional fractures and/or faults that transect the W Superior Province, again with little to no direct surface or upper crustal expression, are spatially associated with magmatic Ni-Cu-PGE-Cr and related mineralization and Au occurrences. The McFaulds Lake greenstone belt, aka. 'Ring of Fire', constitutes only a small, crescent-shaped belt within one of these concentric features above which 2736-2733 Ma mafic-ultramafic intrusions bodies were intruded. The Big Trout Lake igneous complex that hosts Cr-Pt-Pd-Rh mineralization west of the Ring of Fire lies within a smaller concentrically ringed feature at depth and, near the Ontario-Manitoba border, the Lingman Lake Au deposit, numerous Au occurrences and minor Ni showings, are similarly located on concentric structures. Preliminary magnetotelluric (MT) interpretations suggest that these concentric structures appear to also have an expression in the subcontinental lithospheric mantle (SCLM) and that lithospheric mantle resistivity features trend N-S as well as E-W. With diameters between ca. 90 km to 185 km, elliptical structures are similar in size and internal geometry to coronae on Venus which geomorphological, radar, and gravity interpretations suggest formed above mantle upwellings. Emplacement of mafic-ultramafic bodies hosting Ni-Cr-PGE mineralization along these ringlike structures at their intersection with coeval deep transverse, ca. N-S faults (viz. phi structures), along with their location along the margin to the N Superior proto-craton, are consistent with secondary mantle upwellings portrayed in numerical models of a mantle plume beneath a craton with a deep lithospheric keel within a regional N-S compressional regime. Early, regional ca. N-S faults in the W Superior were reactivated as dilatational antithetic (secondary Riedel/R') sinistral shears during dextral transpression and as extensional fractures and/or normal faults during N-S shortening. The Kapuskasing structural zone or uplift likely represents Proterozoic reactivation of a similar deep transverse structure. Preservation of discrete faults in the deep crust beneath zones of distributed Neoarchean dextral transcurrent to transpressional shear zones in the present-day upper crust suggests a 'millefeuille' lithospheric strength profile, with competent SCLM, mid- to deep, and upper crustal layers. Mechanically strong deep crustal felsic and mafic granulite layers are attributed to dehydration and melt extraction. Intra-crustal decoupling along a ductile décollement in the W Superior led to the preservation of early-formed deep structures that acted as conduits for magma transport into the overlying crust and focussed hydrothermal fluid flow during regional deformation. Increase in the thickness of semi-brittle layers in the lower crust during regional metamorphism would result in an increase in fracturing and faulting in the lower crust, facilitating hydrothermal and carbonic fluid flow in pathways linking SCLM to the upper crust, a factor explaining the late timing for most orogenic Au. Results provide an important new dataset for regional prospectively mapping, especially with machine learning, and exploration targeting for Au and Ni-Cr-Cu-PGE mineralization. Results also furnish evidence for parautochthonous development of the S Superior Province during plume-related rifting and cannot be explained by conventional subduction and arc-accretion models.
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Thermal effects of thin igneous intrusions on diagenetic reactions in a Tertiary basin of southwestern Washington. US Geological Survey, 1995. http://dx.doi.org/10.3133/b2085c.

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Middle Eocene intrusive igneous rocks of the Central Appalachian Valley and Ridge province-setting, chemistry, and implications for crustal structure. US Geological Survey, 1992. http://dx.doi.org/10.3133/b1839j.

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Paleomagnetic and 40Ar/39Ar results from the Grant intrusive breccia and coparison to the Permian Downeys Bluff Sill; evidence for Permian igneous activity at Hicks Dome, southern Illinois Basin. US Geological Survey, 1997. http://dx.doi.org/10.3133/b2094g.

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