Academic literature on the topic 'Post-subduction magmatism'
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Journal articles on the topic "Post-subduction magmatism"
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Gower, Charles F., and Thomas E. Krogh. "A U–Pb geochronological review of the Proterozoic history of the eastern Grenville Province." Canadian Journal of Earth Sciences 39, no. 5 (May 1, 2002): 795–829. http://dx.doi.org/10.1139/e01-090.
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The geological evolution of the eastern Grenville Province can be subdivided into three stages. During the first stage, namely pre-Labradorian (> 1710 Ma) and Labradorian (17101600 Ma) events, a continental-marginal basin was created and subsequently destroyed during accretion of a magmatic arc formed over a south-dipping subduction zone. Subduction was short-lived and arrested, leading to a passive continental margin. The second stage addresses events between 1600 and 1230 Ma. The passive margin lasted until 1520 Ma, following which a continental-margin arc was constructed during Pinwarian (15201460 Ma) orogenesis. Elsonian (14601230 Ma) distal-inboard, mafic and anorthositic magmatism, decreasing in age northward, is explained by funnelled flat subduction, possibly associated with an overridden spreading centre. As the leading edge of the lower plate advanced, it was forced beneath the Paleoproterozoic Torngat orogen root between the Archean Superior and North Atlantic cratons, achieving its limit of penetration by 1290 Ma. Static north-northeast-trending rifting then ensued, with mafic magmatism flanked by felsic products to the north and south. Far-field orogenic effects heralded the third stage, lasting from 1230 to 955 Ma. Until 1180 Ma, the eastern Grenville Province was under the distal, mild influence of Elzevirian orogenesis. From 1180 to 1120 Ma, mafic and anorthositic magmatism occurred, attributed to back-arc tectonism inboard of a post-Elzevirian Laurentian margin. Quiescence then prevailed until Grenvillian (1080980 Ma) continentcontinent collision. Grenvillian orogenesis peaked in different places at different times as thrusting released stress, thereby precipitating its shift elsewhere (pressure-point orogenesis). High-grade metamorphism, thrusting and minor magmatism characterized the Exterior Thrust Zone, in contrast to voluminous magmatism in the Interior Magmatic Belt. Following final deformation, early posttectonic anorthositicalkalicmafic magmatism (985975 Ma) and late posttectonic monzoniticsyenitegranite magmatism (975955 Ma) brought the active geological evolution of this region to a close.
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Nardi, Lauro V. S., Jorge Plá-Cid, Maria de Fátima Bitencourt, and Larissa Z. Stabel. "Geochemistry and petrogenesis of post-collisional ultrapotassic syenites and granites from southernmost Brazil: the Piquiri Syenite Massif." Anais da Academia Brasileira de Ciências 80, no. 2 (June 2008): 353–71. http://dx.doi.org/10.1590/s0001-37652008000200014.
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The Piquiri Syenite Massif, southernmost Brazil, is part of the post-collisional magmatism related to the Neoproterozoic Brasiliano-Pan-African Orogenic Cycle. The massif is about 12 km in diameter and is composed of syenites, granites, monzonitic rocks and lamprophyres. Diopside-phlogopite, diopside-biotite-augite-calcic-amphibole, are the main ferro-magnesian paragenesis in the syenitic rocks. Syenitic and granitic rocks are co-magmatic and related to an ultrapotassic, silica-saturated magmatism. Their trace element patterns indicate a probable mantle source modified by previous, subduction-related metasomatism. The ultrapotassic granites of this massif were produced by fractional crystallization of syenitic magmas, and may be considered as a particular group of hypersolvus and subsolvus A-type granites. Based upon textural, structural and geochemical data most of the syenitic rocks, particularly the fine-grained types, are considered as crystallized liquids, in spite of the abundance of cumulatic layers, schlieren, and compositional banding. Most of the studied samples are metaluminous, with K2O/Na2O ratios higher than 2. The ultrapotassic syenitic and lamprophyric rocks in the Piquiri massif are interpreted to have been produced from enriched mantle sources, OIB-type, like most of the post-collisional shoshonitic, sodic alkaline and high-K tholeiitic magmatism in southernmost Brazil. The source of the ultrapotassic and lamprophyric magmas is probably the same veined mantle, with abundant phlogopite + apatite + amphibole that reflects a previous subduction-related metasomatism.
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Soper, N. J. "The Newer Granite problem: a geotectonic view." Geological Magazine 123, no. 3 (May 1986): 227–36. http://dx.doi.org/10.1017/s0016756800034725.
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AbstractThe Siluro–Devonian suite of granitic plutons in the British Caledonides known as the Newer Granites, together with their associated extrusive rocks, represent one of the most extensively researched examples of calc-alkaline magmatism apparently related to orogeny. Although recent chemical studies have credibly interpreted some of the Scottish intrusions and volcanic rocks as part of a continental-margin magmatic arc generated by the subduction of lapetus oceanic lithosphere beneath Laurentia, insurmountable problems of distribution and timing arise when attempts are made to relate the magmatic activity as a whole to a traditional two-plate collision model for the orogeny.Newer Granite magmatism is here discussed in the context of more mobilistic models for the post-Grampian evolution of the British Caledonides which involve E–W closure between Laurentia and Baltica, terminated by collision in the Silurian, followed by the northward accretion of Gondwana-derived terranes in the early Devonian. The former produced the Main Caledonian tectonometamorphism of the Northern Highlands of Scotland, the latter the Late Caledonian deformation of the slate belts in the paratectonic Caledonides. These models imply much more complex convergence geometries which can, in principle, account for the whole Newer Granite suite as a series of subduction-generated magmatic arcs overlapping in space and time.The model proposed involves three late Caledonian magmatic arcs in addition to the Ordovician ‘Borrowdale arc’ which is not considered in this paper. One is related to Laurentia–Baltica convergence with westward subduction beneath the Scottish sector of the Laurentian margin in the Ordovician and Early Silurian, which generated the early members of the Newer Granite suite in the Highlands; a second is related to northward Silurian–early Devonian subduction at the Solway Line, which generated the younger Newer Granites and volcanic rocks north of the Highland Border; and a third, related to northward accretion of the Armorican terrane in early Devonian time, produced intrusive and extrusive magmatism as far south as Southeast Ireland and the English Midlands.
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Ross, Gerald M. "Evolution of Precambrian continental lithosphere in Western Canada: results from Lithoprobe studies in Alberta and beyond." Canadian Journal of Earth Sciences 39, no. 3 (March 1, 2002): 413–37. http://dx.doi.org/10.1139/e02-012.
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The Precambrian lithosphere of western Canada was assembled into the present crustal configuration between ca. 2.01.78 Ga by plate collisions, sometimes accompanied by arc magmatism, with subsequent cooling of the lithosphere since ca. 1.7 Ga. Collisional processes inferred along preserved plate sutures include (1) subduction of oceanic lithosphere and accretion of Proterozoic arc crust to the western Rae Province; (2) marginal basin consumption and tectonic entrapment of the Hearne Province between coeval subductioncollision zones; and (3) amagmatic marginal basin closure, perhaps analogous to the roots of small collisional orogens, such as the Pyrenees. Seismic reflection profiles acquired during the Lithoprobe Alberta Basement Transect have captured images of syn- to post-collisional structures along these sutures and evidence for crustal-scale thrust imbrication and rigid body accretion of Archean crust with preservation of precollisional tectonic fabric. The degree to which lithospheric mantle beneath Archean crustal blocks was preserved during these collisions is unknown, although tectonic geometries imply significant thermal and (or) mechanical interaction. Post-collisional, intrusive mafic magmatism is imaged widely in both seismic reflection and refraction surveys. These magmatic events are demonstrably Proterozoic, based on crosscutting relationships seen on seismic reflection profiles and geochronology of lower crustal xenoliths, and are comparable in scale to Phanerozoic igneous provinces (e.g., large igneous provinces) but have little preserved surface manifestation. Reactivation of Precambrian basement structures is limited or very subtle, reflecting strength control by the mantle on stress transmission and crustal failure. Long-wavelength elastic deformation of the crust during the Phanerozoic occurred in regions associated with, or adjacent to, Proterozoic mafic magmatism, suggesting local rheologic control of anomalous Phanerozoic paleotopography.
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Castillo, P. R. "The cause and source of post-subduction arc magmatism in Baja California, Mexico." Geochimica et Cosmochimica Acta 70, no. 18 (August 2006): A88. http://dx.doi.org/10.1016/j.gca.2006.06.089.
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Trubelja, Fabijan, Klaus Peter Burgath, and Vesna Marchig. "Triassic Magmatism in the Area of the Central Dinarides (Bosnia and Herzegovina): Geochemical Resolving of Tectonic Setting." Geologia Croatica 57, no. 2 (2004): 159–70. http://dx.doi.org/10.4154/gc.2004.13.
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Triassic magmatic rocks in the Central Dinarides in Bosnia and Herze-govina are known from two separate geotectonic units: (1) the AdriaticCarbonate Platform (Outer Dinarides) and (2) the Palaeozoic–Triassicallochthonous complex. They are assigned to the same regional, genetic and geochemical unit. Their emplacement age is inferred from contacts with the surrounding marble and sedimentary rocks (post-Anisian for intrusives and Ladinian for effusives).The magmatic rocks display different levels of emplacement and crystallization (intrusive, effusive and dyke rocks). They represent different stages of magmatic differentiation, from gabbro/basalt via diorite/andesite to granodiorite/dacite and granites. The most frequent dyke rock is diabase. Pillow basalts indicate eruption under subaquaticconditions. Pyroclastic rocks within the volcano-sedimentary unit point to the temporary explosive character of orogenic magmatic activity. Most rocks are affected and modified by post-magmatic alteration and hydrothermal fluids. This led to the formation of spilite, keratophyre, quartz keratophyre and rarely K spilite.New geochemical data support the opinion that subduction was the main process which triggered the Triassic magmatic activity in the Central Dinarides. Although some of the investigated rocks reveal MORB characteristics (in the selected geochemical discriminations), most samples are enriched in all elements which are reported as characteristicfor arc magmatism at convergent margins including incorporationof sediments.
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Pundir, Shailendra, Vikas Adlakha, Santosh Kumar, and Saurabh Singhal. "Closure of India–Asia collision margin along the Shyok Suture Zone in the eastern Karakoram: new geochemical and zircon U–Pb geochronological observations." Geological Magazine 157, no. 9 (February 24, 2020): 1451–72. http://dx.doi.org/10.1017/s0016756819001547.
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AbstractNew whole-rock geochemical analyses along with laser ablation multi-collector inductively coupled plasma mass spectrometry U–Pb zircon ages of the granite–rhyolite from the Karakoram Batholith, exposed along the Shyok Valley, NW India, have been performed to understand the timing and geochemical evolution of these magmatic bodies and their implications for the geodynamic evolution of the Karakoram Batholith. New geochronological data on granites and rhyolites along with previously published geochronological data indicate that the Karakoram Batholith evolved during Albian time (~110–100 Ma) owing to the subduction of Tethys oceanic lithosphere along the Shyok Suture Zone. This region witnessed a period of no magmatism during ~99–85 Ma. Following this, the Kohistan–Ladakh arc and Karakoram Batholith evolved as a single entity in Late Cretaceous and early Palaeogene times. Late Cretaceous (~85 Ma) rhyolite intrusions within the Karakoram Batholith show calc-alkaline subduction-related signatures with a highly peraluminous nature (molar A/CNK = 1.42–1.81). These intrusions may have resulted from c. ~13.8 % to ~34.5 % assimilation of pre-existing granites accompanied by fractional crystallization during the ascent of the magma. The contamination of mantle wedge-derived melts with crust of the active continental margin of the Karakoram most likely enhanced the high peraluminous nature of the rhyolite magma, as has been constrained by assimilation fractional crystallization modelling. Two granite samples from the contact of the Shyok Metamorphic Complex and Karakoram Batholith indicate that the post-collisional Miocene magmatism was not only confined along the Karakoram Fault zone but also extends ~30 km beyond the Shyok–Muglib strand.
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Pease, V., J. H. Scarrow, I. G. Nobre Silva, and A. Cambeses. "Devonian magmatism in the Timan Range, Arctic Russia — subduction, post-orogenic extension, or rifting?" Tectonophysics 691 (November 2016): 185–97. http://dx.doi.org/10.1016/j.tecto.2016.02.002.
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Whalen, Joseph B. "The Topsails igneous suite, western Newfoundland: an Early Silurian subduction-related magmatic suite?" Canadian Journal of Earth Sciences 26, no. 12 (December 1, 1989): 2421–34. http://dx.doi.org/10.1139/e89-207.
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The Topsails igneous suite contains several Late Ordovician to Early Silurian volcanic and intrusive sequences, which overlie and intrude Early to Middle Ordovician oceanic and arc rocks. The oldest components of this suite may represent calc-alkaline, continental-arc magmatism. The younger components are bimodal, with felsic compositions vastly predominating, and include a major (> 2200 km2) alkaline (A-type) granite complex. These felsic components have similarities to peralkaline suites formed in unusual subduction-related settings. Younger mafic components resemble within-plate basalts emplaced in a continental setting.Silurian magmatic activity in the Canadian Appalachians is widespread, includes diverse magmatic types, and has contrasting metamorphic and tectonic overprinting, even in contiguous areas. These features and the probability of major post-Silurian displacements in the orogen render correlation and interpretation difficult. Tectonic models that consider basin closure and major plate movements to be complete by Middle Ordovician time fail to adequately explain the Silurian activity. Available data best fit a model that relates Late Ordovician to Silurian magmatic activity to the opening and closing of small, discontinuous basins, portions of which may have been floored by oceanic crust.
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Sommer, Carlos A., Evandro F. Lima, Lauro V. S. Nardi, Joaquim D. Liz, and Breno L. Waichel. "The evolution of Neoproterozoic magmatism in Southernmost Brazil: shoshonitic, high-K tholeiitic and silica-saturated, sodic alkaline volcanism in post-collisional basins." Anais da Academia Brasileira de Ciências 78, no. 3 (September 2006): 573–89. http://dx.doi.org/10.1590/s0001-37652006000300015.
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The Neoproterozoic shoshonitic and mildly alkaline bimodal volcanism of Southernmost Brazil is represented by rock assemblages associated to sedimentary successions, deposited in strike-slip basins formed at the post-collisional stages of the Brasilian/Pan-African orogenic cycle. The best-preserved volcano sedimentary associations occur in the Camaquã and Campo Alegre Basins, respectively in the Sul-riograndense and Catarinense Shields and are outside the main shear belts or overlying the unaffected basement areas. These basins are characterized by alternation of volcanic cycles and siliciclastic sedimentation developed dominantly on a continental setting under subaerial conditions. This volcanism and the coeval plutonism evolved from high-K tholeiitic and calc-alkaline to shoshonitic and ended with a silica-saturated sodic alkaline magmatism, and its evolution were developed during at least 60 Ma. The compositional variation and evolution of post-collisional magmatism in southern Brazil are interpreted as the result mainly of melting of a heterogeneous mantle source, which includes garnet-phlogopite-bearing peridotites, veined-peridotites with abundant hydrated phases, such as amphibole, apatite and phlogopite, and eventually with the addition of an asthenospheric component. The subduction-related metasomatic character of post-collisional magmatism mantle sources in southern Brazil is put in evidence by Nb-negative anomalies and isotope features typical of EM1 sources.
Dissertations / Theses on the topic "Post-subduction magmatism"
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Filippi, Marco. "Évolution structurelle et métamorphique des roches du socle varisque des Alpes en comparaison avec autres domaines de la chaîne varisque européenne." Thesis, Université Côte d'Azur, 2021. http://www.theses.fr/2021COAZ4017.
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L’évolution tectonique de la chaine varisque méridionale est certainement moins comprise que celle de la chaine varisque de l’Europe centrale. La raison la plus importante est la rééquilibration alpine des roches varisques, qui est particulièrement puissante dans la zone axiale des Alpes. Au contraire, la rééquilibration alpine des socles varisques dans les domaines externes des Alpes n’est pas omniprésente et ils bien préservent l’héritage varisque. Pour cette raison, les domaines externes des Alpes sont importants pour comprendre la chaine varisque méridionale. Les sujets de cette Thèse sont les roches varisques du socle de l’Argentera-Mercantour (domaine helvétique), du domaine Sud-Alpine, et du Massif des Maures-Tanneron. Ce dernier a été ici considéré parce que il est le segment de chaine varisque le plus proche des Alpes et donc une excellente référence pour établir une corrélation entre le varisque "alpine" et le varisque européen. L’objectif de ce projet est la description quantitative de l’évolution tectonique varisque et alpine de ces socles. Le projet a prévu l’étude géologique-structurale du terrain à différentes échelles, intégré avec des analyses micro-structurelles et chimiques des roches et des minéraux. Les conditions métamorphiques des roches sont estimées par les méthodes de la thermo-barométrie et de la modélisation pétrologique et intégrées par des datations relatives et absoutes. Ce faisant, il a été possible de examiner différentes phases tectoniques varisques et alpines, depuis le début du Cambrien jusqu’à le Tertiaire, dans le cadre géodynamique et paléogéographique des deux chaines. Les résultats se réfèrent à quatre phases tectoniques principales, depuis la subduction de l’océan varisque jusqu’à la collision alpineThe tectonic evolution of the Southern Variscan belt is still poorly understood in comparison with that of the central European Variscan belt. That is mostly due to intense late-Variscan to Alpine re-working, which is particularly pervasive in the axial zone of the Alps. At odds, the Variscan rocks of the external domains of the Alps are little affected by the Alpine re-equilibration. For these reasons, these domains well preserve the Variscan record and are of the greatest importance for constraining the evolution of the Southern Variscan belt.This thesis is focused on the Variscan basement rocks in the Argentera-Mercantour Massif (Helvetic domain), Orobic basement (Southalpine domain), and Maures-Tanneron Massif (southern Alpine foreland). The latter is included as a benchmark for the Variscan belt just outside the Alpine area. The aim of the research is to provide new constrains on the Variscan and Alpine tectonic evolution of the external domains of the Alps, as well as of the Alpine foreland.This study required structural mapping (1:10.000 to 1:100 scale) integrated by microstructural, chemical, and mineral-chemical analyses. Metamorphic conditions that affected the Variscan basements have been estimated in terms of pressure and temperature and constrained in time by relative and absolute ages. By doing so, several stages of the Variscan and Alpine tectonics are here addressed, from early Cambrian to Tertiary times, and discussed in light of the geodynamic and paleogeographic reference models for both the Variscan and Alpine belts. The results refer to four main tectonic stages of Southern Variscan belt, from the subduction of the Variscan Ocean to the Alpine collision
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Ormerod, D. S. "Late- to post-subduction magmatic transitions in the Western Great Basin, U.S.A." Thesis, Open University, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233247.
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Robinson, Frank Alexander. "Geochronological and geochemical constraints on the lithospheric evolution of the Arabian shield, Saudi Arabia: understanding plutonic rock petrogenesis in an accretionary orogen." Thesis, 2014. http://hdl.handle.net/2440/84674.
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The Arabian-Nubian shield reflects the complex interplay between juvenile oceanic and continental arc fragments accreted during the final stages of Gondwanian super continental assembly. To date, much of the geochronological and geochemical data from the Arabian Shield, Saudi Arabia, is absent or poorly constrained and extrapolated from neighbouring Middle Eastern and African countries. Little attention has been paid to the petrogenesis and tectonic significance of the plutonic rocks pursuant to lithospheric orogenesis. A total of 137 samples from 26 geological units were collected from the Midyan, Hijaz, Asir, Tathlith, Afif, Ad Dawadimi and Ha’il terranes with particular emphasis on accretionary suture zone and within plate setting relationships. Extensive data bases are constructed using zircon U-Pb geochronology and Hf isotopes to evaluate Gondwanian significance and whole rock major and trace element geochemistry, Nd, Sm, Sr isotopes and zircon geochemistry to determine their petrogenetic properties. These parameters provide new insight into changing mantle conditions beneath collisional sutures (Yanbu, Nabitah and Halaban) and within plate asthenospheric upwelling. 19 granitic units are subdivided into metaluminous, peraluminous and peralkaline groups that possess distinguished island arc (~950-730Ma), syncollisional (~<730-636Ma), post tectonic (~<636-600Ma) and anorogenic (<600Ma) U-Pb geochronology. These magmatic phases represent accretionary cycles initiating from the dismantlement of Rodinia, closure of the Mozambique Ocean and final Gondwana amalgamation. Evidence for final assembly is recorded at ~525Ma (Najd fault reactivation) which is now the youngest dated magmatism in the Arabian-Nubian Shield and warrants repositioning of the regional unconformity at ~542Ma. Emplacement of sampled Arabian Shield classic A-type post-tectonic and anorogenic granitoids falls into three categories: 1) Intrude sutures immediately following collision which contain extensive mafic cumulate fractionation and N-MORB affiliation. 2) Plate boundary juxtaposed suites without obvious mafic cumulates, but posses contaminated N-MORB geochemistry. 3) Within plate granitoids isolated from plate boundaries and also without obvious mafic cumulates, but with a distinctive enriched (OIB) like asthenospheric mantle source. All categories produce similar felsic endmembers, but contain isotopically distinct mantle source. These are differentiated using a newly developed geochemical scheme (contaminated and enriched mantle granitoids) that is successfully applied to regional Arabian-Nubian examples. The diachronous Nabitah Orogenic Belt symbolises collision and subduction between western oceanic and eastern continental terranes that was terminated by the appearance of category 1 post-tectonic granitoids. This long lived (~50Ma) granitic magmatism contains mingling textures, discrete crystallisation ages, distinguished zircon morphologies and isotopically less juvenile mafics that geochronologically and geochemically reflect magmatic pulsing from a contaminated lower crustal MASH zone. The transition from N-MORB like mafics to isotopically enriched granitoids (isotopically similar to category 3 suites) reflects subduction magmatism followed by slab tear and asthenospheric influx. Conversely, the appearance of category 3 anorogenic plutons is characterised by widespread, tightly constrained (<10Ma) magmatism that is geochemically enriched, economic and symbolic of lithospheric delamination and asthenospheric (OIB like) upwelling. Differences between category 1, 2 and 3 zircon geochemistry constrain further contaminated and enriched mantle source behaviour that produces similar felsic products from distinguished petrogenetic processes. In summary, the work presented in this thesis establishes clear distinctions between accretionary syncollisional suites and anorogenic suites, but more significantly, post-orogenic plutons confined to suture zones from those confined to within plate settings. This allows new petrogenetic insights into changing juvenile mantle beneath the Arabian Shield.Thesis (Ph.D.) -- University of Adelaide, School of Earth and Environmental Sciences, 2014
Book chapters on the topic "Post-subduction magmatism"
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Apen, Francisco E., John Wakabayashi, Howard W. Day, Sarah M. Roeske, A. Kate Souders, and Trevor A. Dumitru. "Regional-scale correlations of accreted units in the Franciscan Complex, California, USA: A record of long-lived, episodic subduction accretion." In Plate Tectonics, Ophiolites, and Societal Significance of Geology: A Celebration of the Career of Eldridge Moores. Geological Society of America, 2021. http://dx.doi.org/10.1130/2021.2552(11).
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ABSTRACT The Franciscan Complex of California, the type example of an exhumed accretionary complex, records a protracted history of voluminous subduction accretion along the western margin of North America. Recent geochronological work has improved our knowledge of the timing of accretion, but the details of the accretionary history are disputed, in part, due to uncertainties in regional-scale correlations of different units. We present new detrital zircon U-Pb ages from two sites on opposite sides of San Francisco Bay in central California that confirm previously proposed correlations. Both sites are characterized by a structurally higher blueschist-facies unit (Angel Island unit) underlain by a prehnite-pumpellyite-facies unit (Alcatraz unit). The Angel Island unit yields maximum depositional ages (MDAs) ranging from 112 ± 1 Ma to 114 ± 1 Ma (±2σ), and the Alcatraz unit yields MDAs between 94 ± 2 Ma and 99 ± 1 Ma. Restoration of post-subduction dextral displacement suggests these sites were originally 44–78 km apart and much closer to other Franciscan units that are now exposed farther south in the Diablo Range. Comparison with detrital zircon dates from the Diablo Range supports correlations of the Bay Area units with certain units in the Diablo Range. In contrast, correlations with Franciscan units in the northern Coast Ranges of California are not robust: some units are clearly older than those in the Bay Area whereas others exhibit distinct differences in provenance. Integration of age data from throughout the Franciscan Complex indicates long-lived and episodic accretion from the Early Cretaceous to Paleogene. Although minor, sporadic accretion began earlier, significant accretion occurred during the interval 123–80 Ma and was followed by minor accretion at ca. 53–49 Ma. Periods of accretion and nonaccretion were associated with arc magmatism in the Sierra Nevada–Klamath region, cessation of arc activity, and reorganization of paleodrainage systems, which implicates plate dynamics and sediment availability as major controls on the development of the Franciscan Complex.
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Abdollah, Saidi, Khan Nazer Nasser, Hadi Pourjamali Zahra, and Farzad Kiana. "The Breaking of the Iranian Block during the Cretaceous and the Opening of New Oceanic Basins within the Tethys Ocean: The Case of the Sabzevar-Nain Basin and Its Geodynamic History." In Earth’s Crust and Its Evolution - From Pangea to the Present Continents. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.105440.
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The Jurassic subduction of the Neo-Tethys oceanic crust under the western continental margin of the Iranian Block has led to the fragmentation of the Iranian Block in the back-arc basin, leading to the opening of three oceanic basins around it. The ophiolitic belts surrounding central Iran are the indicators of the closure of these basins. The Sabzevar-Nain Basin is one of these basins, which has been created between the micro-block of central Iran in the south and the Alborz Mountain Ranges in the north. This basin opened in the late Jurassic as a rift and then became a trough in the early Cretaceous. Finally, this basin developed into an oceanic basin in the early late Cretaceous. The sedimentation in this basin can be divided into pre-rift, syn-rift and oceanic environments. All of these sediments are strongly folded and faulted. The closure of this basin started during the Paleocene with a subduction under the southern margin of the Alborz Mountain Ranges. The collision event between the northern margin of the micro-block of central Iran and the southern margin of the Alborz Mountain Ranges occurred in the early Eocene. The result of this event was the creation of a wide collision zone, forming a volcanic arc and a back arc basin on the active of the Alborz Mountain Ranges, an ophiolitic belt, and post- collision intrusion masses that appear everywhere in the collision zone. In the point of lithology, these intrusion masses are composed of granite, diorite, and granodiorite. The magmatic activities that started in the Paleocene-early Eocene continued until early Quaternary.
Conference papers on the topic "Post-subduction magmatism"
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Tuffield, Lauren. "Aegean magmatism: Subduction or post-subduction?" In Goldschmidt2022. France: European Association of Geochemistry, 2022. http://dx.doi.org/10.46427/gold2022.10123.
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Quandt, Dennis, Peter Micheuz, Walter Kurz, and Kurt Krenn. "FLUID INCLUSIONS OF VEIN PRECIPITATES HOSTED IN THE TROODOS PILLOW LAVAS: IMPLICATIONS FOR THE POST-MAGMATIC STRUCTURAL EVOLUTION OF SUPRA-SUBDUCTION ZONES." In GSA Annual Meeting in Seattle, Washington, USA - 2017. Geological Society of America, 2017. http://dx.doi.org/10.1130/abs/2017am-302874.
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Negrete-Aranda, Raquel, Juan Contreras, and Ronald Spelz-Madero. "POST-SUBDUCTION VOLCANISM IN THE BAJA CALIFORNIA PENINSULA, MEXICO: THE EFFECTS OF REGIONAL THERMAL ANOMALIES AND ITS IMPLICATIONS ON THE MAGMATIC EVOLUTION OF BAJA CALIFORNIA VOLCANISM FOLLOWING A MAJOR TECTONIC RECONFIGURATION." In GSA Connects 2022 meeting in Denver, Colorado. Geological Society of America, 2022. http://dx.doi.org/10.1130/abs/2022am-383597.
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