Relevant bibliographies by topics / Magmatismo Triassico

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Academic literature on the topic 'Magmatismo Triassico'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Magmatismo Triassico"

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Fang, Wei, Li-Qun Dai, Yong-Fei Zheng, Zi-Fu Zhao, and Li-Tao Ma. "Tectonic transition from oceanic subduction to continental collision: New geochemical evidence from Early-Middle Triassic mafic igneous rocks in southern Liaodong Peninsula, east-central China." GSA Bulletin 132, no. 7-8 (November 18, 2019): 1469–88. http://dx.doi.org/10.1130/b35278.1.

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Abstract In contrast to the widespread occurrence of mafic arc magmatism during oceanic subduction, there is a general lack of such magmatism during continental subduction. This paradigm is challenged by the discovery of Early-Middle Triassic mafic igneous rocks from the southeastern margin of the North China Block (NCB), which was subducted by the South China Block (SCB) during the Triassic. Zircon U-Pb dating for these mafic rocks yields 247 ± 2–244 ± 5 Ma for their emplacement, coeval with the initial collision between the two continental blocks. These Triassic mafic rocks generally exhibit ocean island basalt (OIB)-like trace element distribution patterns, intermediate (87Sr/86Sr)i ratios of 0.7057–0.7091, weakly negative εNd(t) values of –1.2 to –3.8, and εHf(t) values of –1.3 to –3.2. Such geochemical features indicate origination from a metasomatic mantle source with involvement of felsic melts derived from dehydration melting of the previously subducting Paleo-Tethyan oceanic crust. The syn-magmatic zircons of Triassic age show variable Hf-O isotopic compositions, indicating that the crustal component was composed of both altered basaltic oceanic crust and terrigenous sediment. High Fe/Mn and Zn/Fe ratios suggest that the mantle source would mainly consist of ultramafic pyroxenites. The melt-mobile incompatible trace elements were further fractionated relative to melt-immobile trace elements during partial melting of these pyroxenites, giving rise to basaltic melts with OIB-like geochemical signatures. The mafic magmatism may be caused by tectonic extension due to rollback of the subducting Paleo-Tethyan oceanic slab in response to the initial collision of the NCB and SCB in the Early Triassic. Therefore, the syn-subduction mafic magmatism provides new geochemical evidence for tectonic transition from oceanic subduction to continental collision in east-central China.
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De Min, Angelo, Matteo Velicogna, Luca Ziberna, Massimo Chiaradia, Antonio Alberti, and Andrea Marzoli. "Triassic magmatism in the European Southern Alps as an early phase of Pangea break-up." Geological Magazine 157, no. 11 (April 30, 2020): 1800–1822. http://dx.doi.org/10.1017/s0016756820000084.

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AbstractMagmatic rocks from the Dolomites, Carnic and Julian Alps, Italy, have been sampled to investigate the origin and geodynamic setting of Triassic magmatism in the Southern Alps. Basaltic, gabbroic and lamprophyric samples have been characterized for their petrography, mineral chemistry, whole-rock major and trace elements, and Sr, Nd and Pb isotopic compositions. Geothermobarometric estimates suggest that the basaltic magmas crystallized mostly at depths of 14–20 km. Isotopic data show variable degrees of crustal contamination decreasing westwards, probably reflecting a progressively more restitic nature of the crust, which has been variably affected by melting during the Permian period. Geochemical and isotopic data suggest that the mantle source was metasomatized by slab-derived fluids. In agreement with previous studies and based on geological evidence, we argue that this metasomatism was not contemporaneous with the Ladinian–Carnian magmatism but was related to previous subduction episodes. The lamprophyres, which likely originated some 20 Ma later by lower degrees of melting and at higher pressures with respect to the basaltic suite, suggest that the mantle source regions of Triassic magmatism in the Dolomites was both laterally and vertically heterogeneous. We conclude that the orogenic signatures of the magmas do not imply any coeval subduction in the surrounding of Adria. We rather suggest that this magmatism is related to the Triassic rifting episodes that affected the western Mediterranean region and that were ultimately connected to the rifting events that caused the break-up of Pangea during the Late Triassic – Early Jurassic period.
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Pál-Molnár, Elemér, Luca Kiri, Réka Lukács, István Dunkl, Anikó Batki, Máté Szemerédi, Enikő Eszter Almási, Edina Sogrik, and Szabolcs Harangi. "Timing of magmatism of the Ditrău Alkaline Massif, Romania – A review based on new U–Pb and K/Ar data." Central European Geology 64, no. 1 (May 29, 2021): 18–37. http://dx.doi.org/10.1556/24.2021.00001.

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AbstractThe timing of Triassic magmatism of the Ditrău Alkaline Massif (Eastern Carpathians, Romania) is important for constraining the tectonic framework and emplacement context of this igneous suite during the closure of Paleotethys and coeval continental rifting, as well as formation of back-arc basins.Our latest geochronological data refine the previously reported ages ranging between 237.4 ± 9.1 and 81.3 ± 3.1 Ma. New K/Ar and U–Pb age data combined with all recently (post-1990) published ages indicate a relatively short magmatic span (between 238.6 ± 8.9 Ma and 225.3 ± 2.7 Ma; adding that the most relevant U–Pb ages scatter around ∼230 Ma) of the Ditrău Alkaline Massif. The age data complemented by corresponding palinspastic reconstructions shed light on the paleogeographic environment wherein the investigated igneous suite was formed.The magmatism of the Ditrău Alkaline Massif could be associated with an intra-plate, rift-related extensional tectonic setting at the southwestern margin of the East European Craton during the Middle–Late Triassic (Ladinian–Norian) period.
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Asvesta, Argyro, and Sarantis Dimitriadis. "Magma–sediment interaction during the emplacement of syn-sedimentary silicic and mafic intrusions and lavas into and onto Triassic strata (Circum-Rhodope Belt, northern Greece)." Geologica Carpathica 64, no. 3 (June 1, 2013): 181–94. http://dx.doi.org/10.2478/geoca-2013-0013.

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Abstract Within the Circum-Rhodope Belt in northern Greece, Middle Triassic neritic carbonate metasediments are locally intercalated with quartz-feldspar-phyric metarhyolites. In the same belt, Upper Triassic pelagic lime-marl-layered metasediments are similarly intercalated with low-grade metamorphosed basalt, dolerite and minor andesite and trachydacite. We interpret these sequences as due to magmatism active during the rifting event that eventually led to the opening of the Vardar Ocean. Despite the overprint of Late Jurassic deformation and low greenschist metamorphism, peperitic textures produced by magma-wet sediment interaction are well preserved at the contacts between the silicic volcanic rocks and the originally wet unconsolidated neritic carbonate sediments, suggesting contemporaneous magmatism and sedimentation. The mafic and intermediate volcanic rocks lack peperitic textures at their contacts with the pelagic sedimentary rocks. Thin margin parallel banding in the sedimentary members of the sequence indicates thermally affected original contacts with the mafic volcanic rocks only locally and at a microscopic scale. The absence of peperite in this case is attributed to the consolidated state of the sediments at the time of the mafic magma emplacement.
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Moiseev, A. V., M. V. Luchitskaya, I. V. Gul’pa, V. B. Khubanov, and B. V. Belyatsky. "Vendian and Permian-Triassic plagiogranite magmatism of the Ust’-Belaya Mountains, West-Koryak fold system, Northeastern of Russia." Геотектоника, no. 1 (April 1, 2019): 87–114. http://dx.doi.org/10.31857/s0016-853x2019187-114.

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Vendian and Permian-Triassic plagiogranite magmatism is distinguished for Ust’-Belsky and Algansky terranes of West-Koryak fold system. U–Pb zircon ages from Vendian and Permian-Triassic plagiogranites are 556 ± 3 Ma (SIMS), 538 ± 7 Ma (LA–ICP–MS) and 235 ± 2 Ma (SIMS) consequently. It is revealed, that Vendian and Permian-Triassic plagiogranites are mainly low-K and low-Al. Sr–Nd isotopy and rare-earth element patterns allow supposing their formation by partial melting of primarily mantle substrate or by fractional crystallization of basic magma. Vendian plagiogranites formed within active margin in ensimatic island arc simultaneously with deposition of lower part of volcanic-sedimentary complex of Otrozhninskaya slice. We suggest the Permian-Triassic plagiogranites were being formed within the limits of Ust’-Belsky segment of Koni-Taigonos arc during partial melting of melanocratic ophiolite material build up as fragments in accretionary structure of that arc or by fractional crystallization of basic magmas melted from the similar substrate.
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Ivanov, K. S., and Yu V. Erokhin. "On time of the triassic rifts system origin in West Siberia." Доклады Академии наук 486, no. 1 (May 10, 2019): 88–92. http://dx.doi.org/10.31857/s0869-5652486188-92.

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It is commonly supposed that a very substantial volume of early basalt magmatism effused synchronously on Siberia platform and West Siberia in a very short time interval at 249.4 ± 0.5 Ma (Reichow et al., 2002, etc.). This magmatism and induced climate change are considered as a main reason of the most catastrophic in the Earth history extinction at the border of Permian and Triassic time. But these conclusions were based on incomplete and unrepresentative data on West Siberia. We have obtained by analysis of pyroxenes monofraction from kainotype basalts of Guslinskaya P-430 well Ar-Ar age 268.4 ± 7.5 Ma. In Taurovskaya 503 well this age is 268.1 ± 7.5 Ma. Hence, volcanism in axial rift zones of the basement of West Siberia plate began earlier than that considered before and significantly earlier than on Siberia platform.
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Vernikovsky, Valery A., Antonina Vernikovskaya, Vasilij Proskurnin, Nikolay Matushkin, Maria Proskurnina, Pavel Kadilnikov, Alexander Larionov, and Alexey Travin. "Late Paleozoic–Early Mesozoic Granite Magmatism on the Arctic Margin of the Siberian Craton during the Kara-Siberia Oblique Collision and Plume Events." Minerals 10, no. 6 (June 25, 2020): 571. http://dx.doi.org/10.3390/min10060571.

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We present new structural, petrographic, geochemical and geochronological data for the late Paleozoic–early Mesozoic granites and associated igneous rocks of the Taimyr Peninsula. It is demonstrated that large volumes of granites were formed due to the oblique collision of the Kara microcontinent and the Siberian paleocontinent. Based on U-Th-Pb isotope data for zircons, we identify syncollisional (315–282 Ma) and postcollisional (264–248 Ma) varieties, which differ not only in age but also in petrochemical and geochemical features. It is also shown that as the postcollisional magmatism was coming to an end, Siberian plume magmatism manifested in the Kara orogen and was represented by basalts and dolerites of the trap formation (251–249 Ma), but also by differentiated and individual intrusions of monzonites, quartz monzonites and syenites (Early–Middle Triassic) with a mixed crustal-mantle source. We present a geodynamic model for the formation of the Kara orogen and discuss the relationship between collisional and trap magmatism.
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Sazonov, Anatoly M., Aleksei E. Romanovsky, Igor F. Gertner, Elena A. Zvyagina, Tatyana S. Krasnova, Oleg M. Grinev, Sergey A. Silyanov, and Yurii V. Kolmakov. "Genesis of Precious Metal Mineralization in Intrusions of Ultramafic, Alkaline Rocks and Carbonatites in the North of the Siberian Platform." Minerals 11, no. 4 (March 29, 2021): 354. http://dx.doi.org/10.3390/min11040354.

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The gold and platinum-group elements (PGE) mineralization of the Guli and Kresty intrusions was formed in the process of polyphase magmatism of the central type during the Permian and Triassic age. It is suggested that native osmium and iridium crystal nuclei were formed in the mantle at earlier high-temperature events of magma generation of the mantle substratum in the interval of 765–545 Ma and were brought by meimechite melts to the area of development of magmatic bodies. The pulsating magmatism of the later phases assisted in particle enlargement. Native gold was crystallized at a temperature of 415–200 °C at the hydrothermal-metasomatic stages of the meimechite, melilite, foidolite and carbonatite magmatism. The association of minerals of precious metals with oily, resinous and asphaltene bitumen testifies to the genetic relation of the mineralization to carbonaceous metasomatism. Identifying the carbonaceous gold and platinoid ore formation associated genetically with the parental formation of ultramafic, alkaline rocks and carbonatites is suggested.
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Riley, T. R., M. J. Flowerdew, R. J. Pankhurst, P. T. Leat, I. L. Millar, C. M. Fanning, and M. J. Whitehouse. "A revised geochronology of Thurston Island, West Antarctica, and correlations along the proto-Pacific margin of Gondwana." Antarctic Science 29, no. 1 (August 30, 2016): 47–60. http://dx.doi.org/10.1017/s0954102016000341.

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AbstractThe continental margin of Gondwana preserves a record of long-lived magmatism from the Andean Cordillera to Australia. The crustal blocks of West Antarctica form part of this margin, with Palaeozoic–Mesozoic magmatism particularly well preserved in the Antarctic Peninsula and Marie Byrd Land. Magmatic events on the intervening Thurston Island crustal block are poorly defined, which has hindered accurate correlations along the margin. Six samples are dated here using U-Pb geochronology and cover the geological history on Thurston Island. The basement gneisses from Morgan Inlet have a protolith age of 349±2 Ma and correlate closely with the Devonian–Carboniferous magmatism of Marie Byrd Land and New Zealand. Triassic (240–220 Ma) magmatism is identified at two sites on Thurston Island, with Hf isotopes indicating magma extraction from Mesoproterozoic-age lower crust. Several sites on Thurston Island preserve rhyolitic tuffs that have been dated at 182 Ma and are likely to correlate with the successions in the Antarctic Peninsula, particularly given the pre-break-up position of the Thurston Island crustal block. Silicic volcanism was widespread in Patagonia and the Antarctic Peninsula at ~ 183 Ma forming the extensive Chon Aike Province. The most extensive episode of magmatism along the active margin took place during the mid-Cretaceous. This Cordillera ‘flare-up’ event of the Gondwana margin is also developed on Thurston Island with granitoid magmatism dated in the interval 110–100 Ma.
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Vozárová, Anna, Sergey Presnyakov, Katarína Šarinová, and Miloš Šmelko. "First evidence for Permian-Triassic boundary volcanism in the Northern Gemericum: geochemistry and U-Pb zircon geochronology." Geologica Carpathica 66, no. 5 (October 1, 2015): 375–91. http://dx.doi.org/10.1515/geoca-2015-0032.

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AbstractSeveral magmatic events based on U-Pb zircon geochronology were recognized in the Permian sedimentary succession of the Northern Gemeric Unit (NGU). The Kungurian magmatic event is dominant. The later magmatism stage was documented at the Permian-Triassic boundary. The detrital zircon assemblages from surrounding sediments documented the Sakmarian magmatic age. The post-orogenic extensional/transtensional faulting controlled the magma ascent and its emplacement. The magmatic products are represented by the calc-alkaline volcanic rocks, ranging from basaltic metaandesite to metarhyolite, associated with subordinate metabasalt. The whole group of the studied NGU Permian metavolcanics has values for the Nb/La ratio at (0.44–0.27) and for the Nb/U ratio at (9.55–4.18), which suggests that they represent mainly crustal melts. Magma derivation from continental crust or underplated crust is also indicated by high values of Y/Nb ratios, ranging from 1.63 to 4.01. The new206U–238Pb zircon ages (concordia age at 269 ± 7 Ma) confirm the dominant Kungurian volcanic event in the NGU Permian sedimentary basin. Simultaneously, the Permian-Triassic boundary volcanism at 251 ± 4 Ma has been found for the first time. The NGU Permian volcanic activity was related to a polyphase extensional tectonic regime. Based on the new and previous U-Pb zircon ages, the bulk of the NGU Permian magmatic activity occurred during the Sakmarian and Kungurian. It was linked to the post-orogenic transpression/transtension tectonic movements that reflected the consolidation of the Variscan orogenic belt. The Permian-Triassic boundary magmatism was accompanied by extension, connected with the beginning of the Alpine Wilson cycle.
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Dissertations / Theses on the topic "Magmatismo Triassico"

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Filipponi, Alessandro. "Modellizzazione petrogenetica dell’origine e dell’evoluzione dei complessi intrusivi di Predazzo e dei Monti Monzoni." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/15559/.

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I Complessi Intrusivi di Predazzo e dei Monti Monzoni hanno età Ladinica (circa 220-240 Ma) e sono intrusi nelle sequenze carbonatiche del Triassico medio-inferiore delle Dolomiti Occidentali. L’affinità shoshonitica che li caratterizza è in apparente contrasto con il regime geodinamico estensionale esistente. Le teorie evolutive proposte per motivare questa impronta sono molteplici: fusione parziale di un mantello metasomatizzato, subduzione, transpressione, miscelamento tra magmi mantellici e crostali. Tutte le analisi disponibili in letteratura definiscono, su diagrammi di Harker e multielemento normalizzati, trend evolutivi coerenti tipici di suite comagmatiche. La modellizzazione di un mantello in risalita adiabatica mostra che è possibile ottenere un fuso parentale arricchito in elementi incompatibili fondendo parzialmente una piccola percentuale (2-3%) di mantello eterogeneo costituito da un Mantello Primitivo (96-97%) e una piccola frazione (3-4%) di Mantello metasomatizzato ad anfibolo simile a quello affiorante nella Zona d’Ultimo. I risultati della modellizzazione sono stati confrontati con i liquidi parentali proposti in letteratura, come il gabbro CB13. Anche se le concentrazioni calcolate di Nb e di Sr si discostano da quelle osservate, gli altri elementi in traccia sono perfettamente riprodotti dalla modelizzazione. Si riesce a riprodurre la maggior parte delle litologie presenti nei due Complessi Intrusivi per cristallizzazione frazionata a partire da un unico fuso a composizione CB13.
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Sloman, L. E. "Middle triassic Magmatism in the Dolomites, Northern Italy." Thesis, University of Oxford, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379987.

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Dickinson, Jenni Michelle. "Jura-triassic magmatism and porphyry Au-Cu mineralization at the Pine Deposit, Toodoggone District, North-central British Columbia." Thesis, University of British Columbia, 2006. http://hdl.handle.net/2429/3959.

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The Pine, Fin, and Mex porphyry Au-Cu ± Mo systems are all located within a 10 km² area in the Toodoggone district, along the eastern margin of the Stikine terrane in British Columbia. Multiple episodes of porphyry-style mineralization are associated with these three magmatic centres. The Fin monzogranite is the oldest dated pluton in the district, with a U-Pb zircon emplacement age of 217.8 ± 0.6 Ma. A cross-cutting main-stage quartz-pyrite-chalcopyrite ± molybdenite ± sphalerite vein gives an older Re-Os molybdenite mineralization age of 221.0 ± 1.4 Ma. Hence the vein probably cross-cuts a slightly older, undated magmatic phase. Lead isotope values for sulphide minerals from main-stage veins indicate that magmatic-derived fluids interacted with country rocks and possibly other fluids. The Pine quartz monzonite (U-Pb zircon emplacement age of 197.6 ± 0.5 Ma) intrudes, alters, and locally mineralizes Toodoggone Formation Duncan Member andesite tuff (U-Pb zircon age of 200.9 ± 0.4 Ma). High-grade (0.57 g/t Au and 0.15% Cu) mineralization occurs in main-stage quartz-magnetite chalcopyrite-pyrite veins and disseminated throughout the potassic alteration zone in the Pine quartz monzonite stock. Late-stage anhydrite-pyrite ± specular hematite ± chalcopyrite, quartz-pyrite ± chalcopyrite, and pyrite ± chalcopyrite veins and related phyllic alteration cross-cut earlier veins. Propylitic alteration occurs distal to the potassic core of Pine in the Fin monzogranite and Duncan Member andesite. Limited fluid inclusion data, in combination with S and Pb isotope values for veins and host rocks, suggest that the main-stage fluid was magmatic-derived and deposited metals at 430 to 550 °C and depths of about 5.5 km. Late-stage fluids were also probably derived from the Pine quartz monzonite but interacted with Takla Group country rock prior to metal deposition. Metals were deposited at temperatures of 330 to 430 °C and depths of about 5.0 to 5.5 km. The final mineralization phase of the Pine porphyry system is temporally constrained by the emplacement of weakly mineralized syenite dykes (U-Pb zircon age of 193.8 ± 0.5 Ma). The final stage of magmatism in the Pine-Fin-Mex area is defined by the emplacement of rhyolite dykes (U-Pb zircon age of 193.6±0.4 Ma).
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Rey, Hernández-González Álvaro Felipe del. "Permian-Triassic plutonism in the chilean frontal Andes (28°-28° 30'S): a key evidence of the geodynamic evolution of the Southwestern margin of Pangea and its implications to the Andean Orogenesis." Tesis, Universidad de Chile, 2016. http://repositorio.uchile.cl/handle/2250/143564.

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Magíster en Ciencias, Mención Geología Geólogo
Tradicionalmente, el magmatismo del Pérmico tardío Triásico ha sido atribuido a un periodo caracterizado por intensas condiciones extensionales. Varias hipótesis han sido propuestas para explicar la extensión continental observada, incluyendo el cese de la subducción y desprendimiento del slab. No obstante, todas aquellas ideas sólo explican el magmatismo de manera local y fallan en dar un marco tectónico regional para todo el magmatismo de aquel periodo a lo largo del margen continental chileno argentino. Asimismo, tampoco entregan una explicación clara de cómo aquella configuración tectónica cambió y dio origen a la subducción Andina al comienzo del Jurásico, ni tampoco entregan relaciones genéticas con el resto de la actividad ígnea coetánea observada a lo largo del margen. Esta investigación aporta nuevas perspectivas para el plutonismo del Paleozoico tardío Triásico de la Cordillera Frontal Chilena usando nuevas edades U Pb en zircón (SHRIMP II, LA-ICPMS); isotopos de O, Lu Hf, Sm Nd, Rb Sr y Re Os; y análisis geoquímicos de elementos mayores y trazas. Una detallada comparación con unidades coetáneas que extienden desde los 21° hasta los 40°S permite presentar un nuevo modelo a escala regional para aquel periodo de tiempo, a la vez de su conexión con la Orogénesis Andina. Los resultados indican que el plutonismo estudiado presenta una tendencia continua desde elevados niveles de influencia continental (Carbonífero medio) hacia signaturas más mantélicas (Triásico). A pesar de su continuidad, es posible separar la actividad ígnea entre unidades con o sin afinidades mantélicas hace 270 Ma (Pérmico medio) usando valores isotópicos de δ18O. Además, anomalías negativas de Nb Ta en conjunto con anomalías positivas de Pb, permiten inferir magmatismo de subducción durante todo el periodo estudiado. Por su parte, signaturas de εNdi y 87Sr/86Sri evidencian una fuente proveniente de la corteza continental inferior la cual se vio afectada por diversos componentes corticales. El magmatismo del Carbonífero medio Pérmico tardío se encuentra caracterizado por valores altos de δ18O (δ18O>6.5 ) y bajos de εHfi (εHfi<0); es predominantemente metaluminoso, calco-alcalino a calco-alcalino de alto K y mayoritariamente del tipo I. Estas características describen plutones formados a partir de magmas relacionados con subducción, los cuales se emplazaron en una corteza continental de espesor normal a engrosado, lugar donde adquirieron el aporte de material cortical y/o la influencia de sedimentos. La simultánea ocurrencia del evento orogénico San Rafael (aprox. 284 276 Ma) permite describir un ambiente orogénico para el magmatismo: la Orogénesis Gondwánica, proceso ligado a la formación del supercontinente de Pangea. Al sur de los 31°S, la ausencia de magmatismo posterior a los 300 Ma en el territorio chileno puede ser explicada a partir de la progresiva somerización del slab, la cual eventualmente terminó con el establecimiento de un segmento de flat slab (en Chile) durante gran parte del Pérmico temprano (300 290 Ma). Este proceso no solo restringió el magmatismo en Chile, al mismo tiempo lo desplazó hacia el este, hacia territorio argentino, en donde magmatismo tipo I relacionado a subducción puede ser observado entre 33° y 36°S. El magmatismo del Pérmico medio Triásico presenta valores bajos de δ18O (δ18O<6.5 ) y más positivos de εHfi (εHfi = -3 to +3); y es predominantemente peraluminoso, calco-alcalino a calco-alcalino de alto K, y del tipo I, S y A. En términos generales, sus patrones de elementos traza evidencian condiciones de corteza continental adelgazada. Zonación química Oeste Este (i.e., granitoides de arco del tipo I ocurren en mayor abundancia hacia el Oeste, mientras que granitos de intraplaca del tipo A más hacia el Este en los Andes Frontales Chilenos, 28° 28°30'S) permiten inferir condiciones extensionales en un ambiente de subducción causado por slab rollback con consecuente colapso del orógeno. La condición de slab rollback provocó extensión intensa y su relacionado magmatismo en la región de tras arco con respecto al arco magmático previo (Carbonífero medio Pérmico medio). Parte del consiguiente magmatismo se produjo debido a anatexis de una corteza continental inferior adelgazada, la cual se fundió debido a la acumulación de basaltos formados después de la descompresión causada durante el colapso del orógeno; al mismo tiempo con magmatismo asociado a subducción. De manera análoga al periodo anterior, el magmatismo extensional al sur de los 31°S fue desplazado hacia el continente (hacia Argentina) debido a una somerización del slab, o flat slab, al mismo tiempo de preponderantes condiciones de slab rollback. La razón detrás la extensión producto de rollback recae en bajas velocidades de subducción durante el periodo del supercontinente Pangea. Cuando Pangea comenzó su desmembramiento (ca. 200 Ma), un aumento en la velocidad de subducción finalizó las condiciones de slab rollback. La consiguiente actividad ígnea fue desplazada hacia el Oeste (en territorio chileno), en posible asociación con un aumento en el ángulo de subducción, ocurriendo principalmente en la cuña mantélica sobreyaciente al slab. Finalmente, este proceso explicaría la transición entre el magmatismo Triásico y Jurásico, es decir, al momento del inicio de la Orogénesis Andina.
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Kinney, Sean Thomas. "Re-evaluating the timescale of rift and post-rift magmatism on the Eastern North American Margin via zircon U-Pb geochronology." Thesis, 2021. https://doi.org/10.7916/d8-hwtn-b231.

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The modern plate tectonic paradigm provides a predictive model to understand what mediates dynamic processes at both plate margins and intraplate settings. At some locations on the Earth, the geological record provides evidence of apparent violations of this theoretical framework. In this dissertation, I examine a region on the rifted continental margin of Eastern North America, where at least four distinct episodes of magmatism occurred (in the Late Triassic, Early Jurassic, Early Cretaceous) since the onset of rifting and ultimate breakup of the supercontinent Pangea. It also coincides with a present-day low seismic velocity anomaly in the upper mantle. No other region on the Eastern North American Margin has a record of such anomalous dynamic processes occurring and persisting for more than 200 Myr. In this dissertation, I primarily use zircon U-Pb geochronology to establish the basic chronological framework in which magmatic and magmatic-hydrothermal systems in this region existed and persisted, establishing the temporal parameter space in which it will be possible to test geodynamic mechanisms for their formation. In Chapter 2, I use ultra-high precision zircon U-Pb geochronology via Chemical Abrasion-Isotope Dilution-Thermal Ionization Mass Spectrometry (CA-ID-TIMS) to test whether the onset of magmatism in the largest igneous body in this region (the White Mountain Batholith) is linked to the eruption of the vast flood basalts within the Central Atlantic Magmatic Province (CAMP) and whether its apparent duration is indeed > 50 Myr, as previous workers using whole rock K-Ar and mineral Ar-Ar geochronologic methods suggest. My work uncovered a previously unknown episode of rift-related magmatism in the region that precedes the both the CAMP and the emplacement of the White Mountain Batholith by 3 – 5 Myr. In Chapter 3, I use a combination of high-precision zircon U-Pb geochronology and absolute plate motion models to test whether the Cretaceous igneous province in this region resulted from hot spot magmatism as North America moved over the purported Great Meteor Hotspot. These results cannot falsify the hotspot hypothesis and the new zircon U-Pb ages therefore provide the best available chronological constraints for one of the longest-lived hot spot tracks on the Earth. In Chapter 4, motivated by the confirmation of age discrepancies between low- and intermediate-temperature chronometers and the zircon U-Pb ages presented in Chapter 2, I use a combination of both CA-ID-TIMS and LA-ICP-MS zircon U-Pb geochronologic techniques to place constraints on the timing and duration of magmatism for the Late Triassic-Early Jurassic province. The results of this chapter demonstrate that the magmatism of the White Mountain Magma Series occurs in discrete pulses through much of the Jurassic. Together with zircon Hf isotopic analyses from select samples, I synthesize these age results and construct a hypothesis testing framework in which it will be possible for future investigators to unravel the geodynamic complexities in this region. I provide recommendations for future work and emphasize the need for unified approaches coupling geochronology, geochemistry, and geophysics, to test the range of possible mechanisms responsible for these episodes of anomalous tectono-magmatic activity.
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Roberts, Sarah Elizabeth. "Breccia of Frog Lakes : reconstructing Triassic volcanism and subduction initiation in the east-central Sierra Nevada, California." Thesis, 2014. http://hdl.handle.net/1805/4085.

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Indiana University-Purdue University Indianapolis (IUPUI)
The Antler and Sonoma orogenies occurred along the southwest-trending passive Pacific margin of North America during the Paleozoic concluding with the accretion of the McCloud Arc. A southeast-trending sinistral transform fault truncated the continental margin in the Permian, becoming a locus for initiation of an east-dipping subduction zone creating the Sierran magmatic arc. Constrained in age between two early Triassic tuff layers, the volcanic clasts in the breccia of Frog Lakes represent one of the earliest records of mafic magmatism in the eastern Sierra Nevada. Tholeiitic rock clasts found in the breccia of Frog Lakes in the Saddlebag Lake pendant in the east central Sierra Nevada range in composition from 48% to 63% SiO2. Boninites produced by early volcanism of subduction initiation by spontaneous nucleation at the Izu-Bonin-Mariana arc are more depleted in trace element concentrations than the clasts while andesites from the northern volcanic zone of the Andes produced on crust 50 km thick have similar levels of enrichment and provide a better geochemical modern analogue. Textural analysis of the breccia of Frog Lakes suggest a subaqueous environment of deposition from a mature magmatic arc built on continental crust > 50 km thick during the Triassic. The monzodiorites of Saddlebag and Odell Lakes are temporal intrusive equivalents of the breccia of Frog Lakes and zircon geochemistry indicates a magmatic arc petrogenesis.
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Book chapters on the topic "Magmatismo Triassico"

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Kontak, D. J., A. H. Clark, E. Farrar, and D. F. Strong. "The rift-associated Permo-Triassic magmatism of the Eastern Cordillera: a precursor to the Andean orogeny." In Magmatism at a Plate Edge, 36–44. Boston, MA: Springer US, 1985. http://dx.doi.org/10.1007/978-1-4899-5820-4_5.

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Conference papers on the topic "Magmatismo Triassico"

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Colpron, Maurice, Patrick J. Sack, James L. Crowley, and Murray M. Allan. "LATE TRIASSIC TO MIDDLE JURASSIC MAGMATISM IN THE INTERMONTANE TERRANES OF YUKON." In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-280151.

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Colpron, Maurice, James L. Crowley, and Patrick J. Sack. "LATE TRIASSIC – JURASSIC MAGMATISM, METALLOGENY AND TECTONICS IN THE INTERMONTANE TERRANES OF YUKON." In 115th Annual GSA Cordilleran Section Meeting - 2019. Geological Society of America, 2019. http://dx.doi.org/10.1130/abs/2019cd-329176.

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Riggs, Nancy R., Stephen J. Reynolds, M. Robinson Cecil, Taylor B. Sanchez, and Andrew P. Barth. "SOUTHWEST LAURENTIAN LOWER-MIDDLE TRIASSIC SEDIMENTARY STRATA AND THE RECORD OF EARLIEST CORDILLERAN ARC MAGMATISM." In GSA Annual Meeting in Seattle, Washington, USA - 2017. Geological Society of America, 2017. http://dx.doi.org/10.1130/abs/2017am-304868.

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Li, Zengda. "TRIASSIC MAGMATISM IN SOUTHERN BEISHAN OROGEN, NW CHINA: ZIRCON U–PB GEOCHRONOLOGY, PETROGENESIS AND TECTONIC IMPLICATIONS." In GSA Annual Meeting in Seattle, Washington, USA - 2017. Geological Society of America, 2017. http://dx.doi.org/10.1130/abs/2017am-293933.

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Eby, G. Nelson. "THE COASTAL NEW ENGLAND AND WHITE MOUNTAIN IGNEOUS PROVINCES: TRIASSIC-JURASSIC INTRAPLATE MAGMATISM IN NORTHEASTERN US AND SOUTHEASTERN CANADA." In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-283047.

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Kwiatkowski, Chad, Nancy R. Riggs, and Stephen J. Reynolds. "EARLY CORDILLERAN ARC MAGMATISM RECORDED BY DETRITAL ZIRCON GRAINS IN LOWER TO MIDDLE TRIASSIC STRATA OF SOUTHWESTERN NORTH AMERICA." In GSA 2020 Connects Online. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020am-359886.

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Massoll, Wesley Gareth, and Todd A. LaMaskin. "A “FINAL” PULSE OF MAGMATISM IN THE WALLOWA TERRANE, NORTHEASTERN OREGON: LATE TRIASSIC (NORIAN) SLAB DETACHMENT RECORDED IN THE HURWAL FM., SOUTHERN WALLOWA MOUNTAINS." In 112th Annual GSA Cordilleran Section Meeting. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016cd-274609.

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del Rey, Álvaro, Katja Deckart, Katja Deckart, Noah J. Planavsky, Noah J. Planavsky, César Arriagada, César Arriagada, Fernando Martínez, and Fernando Martínez. "TECTONIC EVOLUTION OF THE SOUTHWESTERN MARGIN OF PANGEA AND ITS GLOBAL IMPLICATIONS: EVIDENCE FROM THE MID PERMIAN-TRIASSIC MAGMATISM ALONG THE CHILEAN-ARGENTINE BORDER." In GSA Annual Meeting in Phoenix, Arizona, USA - 2019. Geological Society of America, 2019. http://dx.doi.org/10.1130/abs/2019am-340577.

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