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Articles de revues sur le sujet « Intraplate magmatism »

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Auteur : Grafiati
Publié le 4 mai 2024

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1

Goodenough, K. M., I. M. Coulson et F. Wall. « Intraplate alkaline magmatism : mineralogy and petrogenesis ». Mineralogical Magazine 67, no 5 (octobre 2003) : 829–30. http://dx.doi.org/10.1180/0670829.

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2

Pirajno, Franco, Reimar Seltmann, Nigel J. Cook et Alexander S. Borisenko. « Special issue “Metallogeny of intraplate magmatism” ». Ore Geology Reviews 35, no 2 (avril 2009) : 111–13. http://dx.doi.org/10.1016/j.oregeorev.2008.12.002.

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3

Bourdon, B. « U-series Constraints on Intraplate Basaltic Magmatism ». Reviews in Mineralogy and Geochemistry 52, no 1 (1 janvier 2003) : 215–54. http://dx.doi.org/10.2113/0520215.

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4

Haller, Miguel J., Gabriela I. Massaferro, Viviana I. Alric, César R. Navarrete et Nilda Menegatti. « Cenozoic intraplate magmatism of central Patagonia, Argentina ». Journal of South American Earth Sciences 102 (octobre 2020) : 102650. http://dx.doi.org/10.1016/j.jsames.2020.102650.

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Dirks, Paul, Hielke Jelsma et Hubert Munyanyiwa. « Intraplate magmatism and tectonics of southern Africa ». Journal of African Earth Sciences 28, no 2 (février 1999) : 285–87. http://dx.doi.org/10.1016/s0899-5362(99)00004-4.

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Kampunzu, A. B. « Intraplate Magmatism and Tectonics of Southern Africa ». Gondwana Research 1, no 3-4 (octobre 1998) : 424–25. http://dx.doi.org/10.1016/s1342-937x(05)70867-4.

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7

Likhanov, I. I., et V. V. Reverdatto. « The first U-Pb (SHRIMP-II) evidence of the Franklin tectonic event at the western margin of the Siberian craton ». Доклады Академии наук 486, no 5 (20 juin 2019) : 567–71. http://dx.doi.org/10.31857/s0869-56524865567-571.

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Geochemical and isotope-geochronological evidence of the manifestation of Late Riphean intraplate magmatism within the Chernorechensky massif at the western margin of the Siberian craton were obtained. These rocks crystallized from high-temperature and anhydrous (water unsaturated) magmas with high concentrations of alkalis, iron, and, mostly incompatible elements, which is typical for anorogenic A-type granites in intraplate extension setting. Their U-Pb zircon age 723 ± 6 Ma can be correlated with the Franklin rift event widely manifested in the north of Laurentia, associated with the breakup of Rodinia. The synchronous successions and similar style of magmatic activity and concomitant rifting, as well as a similar sequence of tectonic-thermal events along the Arctic margin of Rodinia support the spatial proximity of Siberia and the North Atlantic cratons at this time as proposed for the paleogeographic reconstructions.
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Bassias, Yannis, et Lucien Leclaire. « The Davie Ridge in the Mozambique Channel : Crystalline basement and intraplate magmatism ». Neues Jahrbuch für Geologie und Paläontologie - Monatshefte 1990, no 2 (20 mars 1990) : 67–90. http://dx.doi.org/10.1127/njgpm/1990/1990/67.

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9

Mjelde, R., P. Wessel et R. D. Muller. « Global pulsations of intraplate magmatism through the Cenozoic ». Lithosphere 2, no 5 (15 septembre 2010) : 361–76. http://dx.doi.org/10.1130/l107.1.

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Touret, Jacques L. R., et Jan M. Huizenga. « Precambrian intraplate magmatism : high temperature, low pressure crustal granulites ». Journal of African Earth Sciences 28, no 2 (février 1999) : 367–82. http://dx.doi.org/10.1016/s0899-5362(99)00010-x.

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11

Hanson, R. E., R. E. Harmer, T. G. Blenkinsop, D. S. Bullen, I. W. D. Dalziel, W. A. Gose, R. P. Hall et al. « Mesoproterozoic intraplate magmatism in the Kalahari Craton : A review ». Journal of African Earth Sciences 46, no 1-2 (septembre 2006) : 141–67. http://dx.doi.org/10.1016/j.jafrearsci.2006.01.016.

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Ryazantsev, A. V., A. V. Pilitsina, I. A. Novikov et K. E. Degtyarev. « CARBONIFEROUS 40Ar/39Ar AGE OF THE RARE METAL-ENRICHED RHYOLITES AND IGNIMBRITES IN THE SAKMARA ALLOCHTHON OF THE SOUTHERN URALS, THEIR GEOCHEMICAL FEATURES AND GEODYNAMIC SETTING ». Proceedings of higher educational establishments. Geology and Exploration, no 3 (25 juin 2018) : 23–32. http://dx.doi.org/10.32454/0016-7762-2018-3-23-32.

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In the structure of the Sakmara allochthon of the Southern Uralssequence with rhyolites and ignimbrites locally occures. They have Nb-Zr-REE geochemical specialization. This sequence unconformably overlays folded Paleozoic complexes, including the Devonian ones. Rhyolite contains K-feldspar and quartz phenocrysts, K-feldspar glomeroporphyrites and granite xenolith. Geochemical features of the rhyolites show intraplate-originated affinities and A-type granite composition.40Ar/39Ar age of the felsitic matrix of the rhyolites of 303±2 Ma defines the age of the volcanic complex origin. For feldspar phenocrysts the age of 306±3 Ma and 337±3 Ma is obtained. The first value coincides to the matrix age and connected with formation of the volcanic complex. The second value belongs, apparently, to xenogenic material. Obtained age values reflect the evolution of Carboniferous active continental margin magmatism, widespread in different structural zones of the Urals. Rare-metal rhyolites characterize the final late Carboniferous intraplate (rift-related) back-arc magmatism at the active continental margin. Volcanism preceded to a collision-related ophiolitic thrust nappes emplacement.
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Brombin, Valentina, Costanza Bonadiman, Fred Jourdan, Guido Roghi, Massimo Coltorti, Laura E. Webb, Sara Callegaro et al. « Intraplate magmatism at a convergent plate boundary : The case of the Cenozoic northern Adria magmatism ». Earth-Science Reviews 192 (mai 2019) : 355–78. http://dx.doi.org/10.1016/j.earscirev.2019.03.016.

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14

BRIGGS, R. M., et W. F. MCDONOUGH. « Contemporaneous Convergent Margin and Intraplate Magmatism, North Island, New Zealand ». Journal of Petrology 31, no 4 (1 août 1990) : 813–51. http://dx.doi.org/10.1093/petrology/31.4.813.

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15

Pirajno, Franco, Richard E. Ernst, Alexander S. Borisenko, Geliy Fedoseev et Evgeniy A. Naumov. « Intraplate magmatism in Central Asia and China and associated metallogeny ». Ore Geology Reviews 35, no 2 (avril 2009) : 114–36. http://dx.doi.org/10.1016/j.oregeorev.2008.10.003.

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16

Gordienko, I. V., R. A. Badmatsyrenova, V. S. Lantseva et A. L. Elbaev. « Selenga ore district in Western Transbaikalia : structural and mineragenetic zoning, genetic types of deposits and geodynamic settings of ore localization ». Геология рудных месторождений 61, no 5 (18 novembre 2019) : 3–36. http://dx.doi.org/10.31857/s0016-77706153-36.

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Based on complex structural, geological, and mineragenetic metallogenic studies, taking into account the results of earlier subject-specific, prospecting, mapping, and exploration works, it has been established that Upper Paleozoic and Early Mesozoic tectono-magmatic structures are widely developed within the ore district. They are associated with the development of the transregional Upper Paleozoic Selenga-Vitim volcano-plutonic belt of riftogenic type as well as with the formation of the Early Mesozoic Western Transbaikalian zone of intraplate magmatism. The main commercially important mineral raw material resources of the Selenga ore district which are located in the ore clusters (the Kunaley, Kizhinga, Cheremshanka-Oshurkovo, Tashir etal.) and beyond their bounds are associated with the Late Paleozoic-Mesozoic magmatic activity. It is shown that molybdenum and beryllium are the main ore mineral resources within the investigated ore district which establish its mineragenetic features. The new material characteristics of the Upper Paleozoic and Early Mesozoic intraplate magmatic complexes and the associated deposits of mineral raw materials (Mo, Be, Ti, quartz, fluorite and apatite raw materials) and other promising ore objects of gold, uranium and rare-earth-barium-strontium mineralization are obtained. The geodynamic conditions of their formation and the main age boundaries of the ore-forming processes are revealed, the prospects of mining in the Selenga ore district and the involvement of this ore potential in the program of the regions economic modernization are estimated.
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17

Kim, Cheolhong, Naing Aung Khant, Yongmun Jeon, Heejung Kim et Chungwan Lim. « Geochemical Characterization of Intraplate Magmatism from Quaternary Alkaline Volcanic Rocks on Jeju Island, South Korea ». Applied Sciences 11, no 15 (30 juillet 2021) : 7030. http://dx.doi.org/10.3390/app11157030.

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The major and trace elements of Quaternary alkaline volcanic rocks on Jeju Island were analyzed to determine their origin and formation mechanism. The samples included tephrite, trachybasalts, basaltic trachyandesites, tephriphonolites, trachytes, and mantle xenoliths in the host basalt. Although the samples exhibited diversity in SiO2 contents, the relations of Zr vs. Nb and La vs. Nb indicated that the rocks were formed from the fractional crystallization of a single parent magma with slight continental crustal contamination (r: 0–0.3 by AFC modeling), rather than by the mixing of different magma sources. The volcanic rocks had an enriched-mantle-2-like ocean island basalt signature and the basalt was formed by partial melting of the upper mantle, represented by the xenolith samples of our study. The upper mantle of Jeju was affected by arc magmatism, associated with the subduction of the Pacific Plate beneath the Eurasian Plate. Therefore, we inferred that two separate magmatic events occurred on Jeju Island: one associated with the subduction of the Pacific Plate beneath the Eurasian Plate (represented by xenoliths), and another associated with a divergent setting when intraplate magmatism occurred (represented by the host rocks). With AFC modeling, it can be proposed that the Jeju volcanic rocks were formed by the fractional crystallization of the upper mantle combined with assimilation of the continental crust. The xenoliths in this study had different geochemical patterns from previously reported xenoliths, warranting further investigations.
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18

Bozhko, N. A. « Intraplate basic-ultrabasic magmatism through time in terms of supercontinental cyclicity ». Moscow University Geology Bulletin 65, no 3 (juin 2010) : 161–76. http://dx.doi.org/10.3103/s0145875210030026.

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19

Guimarães, André R., J. Godfrey Fitton, Linda A. Kirstein et Dan N. Barfod. « Contemporaneous intraplate magmatism on conjugate South Atlantic margins : A hotspot conundrum ». Earth and Planetary Science Letters 536 (avril 2020) : 116147. http://dx.doi.org/10.1016/j.epsl.2020.116147.

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20

Hawkesworth, C. J., et K. Gallagher. « Mantle hotspots, plumes and regional tectonics as causes of intraplate magmatism ». Terra Nova 5, no 6 (novembre 1993) : 552–59. http://dx.doi.org/10.1111/j.1365-3121.1993.tb00304.x.

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21

Pirajno, F. « Hotspots and mantle plumes : global intraplate tectonics, magmatism and ore deposits ». Mineralogy and Petrology 82, no 3-4 (7 juillet 2004) : 183–216. http://dx.doi.org/10.1007/s00710-004-0046-4.

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22

Salikhov, D. N., V. V. Kholodnov, V. N. Puchkov et I. R. Rakhimov. « Volcanism and intrusive magmatism of the Magnitogorsk paleoarc in the epoch of its “soft” collision with a margin of the East European continent ». LITHOSPHERE (Russia) 20, no 5 (30 octobre 2020) : 630–51. http://dx.doi.org/10.24930/1681-9004-2020-20-5-630-651.

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Research subject. The article sets out to investigate the change of the geodynamic regime from the island-arc type to the accretionary-collisional type in the Late Devonian–Early Carboniferous, which occurred as a result of 1) a collision between the Western part of the Magnitogorsk island arc and the Eastern margin of the East European continent and 2) its later coupling with the heterogeneous composite East Uralian terrain.Materials and methods. The content of petrogenic elements and microelements in the rocks of the Late Paleozoic island-arc complexes of the Magnitogorsk island arc were determined using XRF and ICP MS methods at the Laboratory of Physicochemical Research Methods of the Institute of Geology and Geochemistry, Ural Branch of the Russian Academy of Sciences. In addition, available publications on the composition and formation conditions of these complexes were reviewed.Results. It was found that, in the Late Devonian–Early Carboniferous period, the process of island-arc magmatism of the Magnitogorsk paleoarc was substituted with the formation of intraplate volcano-intrusive complexes. The island-arc magmageneration and its manifestations were controlled by a latitudinal linear zoning and different depths of formation of magmatic cameras, reflecting the self-consistency and spatial isolation of these events.Conclusion. Due to the intensifying collision, melts from different mantle sources were mixing, thus contaminating the island-arc rocks by intraplate (plume-dependent) magmas. According to the composition and concentrations of high-field strength and fluid-mobile chemical elements, suprasubductional fluids played an important role in the evolution of late-island arc magmatic series.
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Dokuz, Abdurrahman, Faruk Aydin et Orhan Karslı. « Postcollisional transition from subduction- to intraplate-type magmatism in the eastern Sakarya zone, Turkey : Indicators of northern Neotethyan slab breakoff ». GSA Bulletin 131, no 9-10 (11 avril 2019) : 1623–42. http://dx.doi.org/10.1130/b31993.1.

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Abstract Postcollisional magmatism in the eastern Sakarya zone was recorded by voluminous basic volcanism and repeated plutonism during the early Cenozoic. The temporal and geochemical evolution of these magmatic rocks is important for understanding the possible geodynamic history of the Sakarya zone. Here, we investigated three representative plutons lying between the towns of Çamlıhemşin (Rize) and İspir (Erzurum), Turkey. These are largely composed of medium-K gabbroic diorites (Marselavat Pluton), shoshonitic monzonites (Güllübağ Pluton), and high-K granites (Ayder Pluton). We present whole-rock geochemistry, 40Ar/39Ar geochronology, and Sr, Nd, and Pb isotope analyses from the plutons to constrain the timing of variations in magmatism and source characteristics, and we provide a new approach to the proposed geodynamic models, which are still heavily debated. The 40Ar/39Ar geochronology reveals a cooling sequence from ca. 45 Ma for the Marselavat Pluton through ca. 41 Ma for the Güllübağ Pluton to ca. 40 Ma for the Ayder Pluton. Whole-rock geochemistry and Sr, Nd, Pb isotopes suggest that crustal contamination was not an important factor affecting magma compositions. Although there was no arc-related tectonic setting in the region during the middle Eocene, the Marselavat Pluton shows some subduction affinities, such as moderately negative Nb and Ta anomalies, and slightly positive Pb anomalies. These signatures were possibly inherited from a depleted mantle source that was modified by hydrous fluids released from the oceanic slab during Late Cretaceous subduction. Geochemical traces of the earlier subduction become uncertain in the Güllübağ samples. They display ocean-island basalt–like multi-element profiles and Nb/Ta, Ce/Pb, and La/Ba ratios. All these point to a mantle source in which earlier subduction signatures were hybridized by the addition of asthenospheric melts. Melting of calc-alkaline crustal material, probably emplaced during the first phase of middle Eocene magmatism (Marselavat), led to the formation of granitic plutonism (Ayder Pluton). Our data in conjunction with early Eocene adakite-like rocks show that melt generation, as in the given sequence, was most probably triggered by breakoff of the northern Neotethyan oceanic slab, ∼13 m.y. after the early Maastrichtian collision between the Sakarya zone and Anatolide-Tauride block, and continued until the end of the middle Eocene. A shallow-marine transgression occurred contemporaneously with the middle Eocene magmatism throughout the Sakarya zone. An extension in this magnitude seems unlikely to be the result of orogenic collapse processes only. The main cause of this extension was most probably related to the northward subduction of the southern Neotethys Ocean beneath the Anatolide-Tauride block. The result is a volumetrically larger amount of middle Eocene magmatism than that expected in response to slab breakoff.
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Redina, A. A., A. G. Doroshkevich, I. R. Prokopyev, I. A. Izbrodin et Yu Yang. « AGE AND SOURCE CHARACTERISTICS OF THE YUZHNOE AND ULAN-UDE REE-FLUORITE OCCURRENCES ASSOCIATED WITH CARBONATITE MAGMATISM (WESTERN TRANSBAIKALIA, RUSSIA) ». Geodynamics & ; Tectonophysics 14, no 6 (14 décembre 2023) : 0728. http://dx.doi.org/10.5800/gt-2023-14-6-0728.

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The article presents new data on the age and isotopic (Sr, Nd) characteristics of the Yuzhnoe and Ulan-Ude REE-fluorite occurrences, paragenetically related to alkaline carbonatite magmatism. Age estimates of the fluorite-containing rocks were obtained from bastnaesites using U-Th-Pb (LA-ICP-MS) method and are 130.2±1.1 and 136.6±1.9 Ma for the Yuzhnoe and Ulan-Ude occurrences, respectively. The ƐNd(T) values of the bastnaesites vary from –7.41 to –6.08 for the Yuzhnoe occurrence and from –4.28 to –2.67 for the Ulan-Ude occurrence. The Yuzhnoe carbonatites are characterized by 87Sr/86Sr(I) ratios ranging from 0.705883 to 0.706011, and 87Sr/86Sr(I) ratios obtained for the Ulan-Ude bastnaesite-fluorite rocks are ranging from 0.70683 to 0.70687. The age estimates are consistent with the published geochronological data on alkaline carbonatite magmatism of the Central Asian orogenic belt related to Late Mesozoic intraplate magmatism and rifting. Isotopic Sr-Nd signatures of bastnaesite, as well as of the Yuzhnoe carbonatites and the Ulan-Ude bastnaesite-fluorites, indicate that their source rocks came from the enriched lithospheric mantle.
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Teixeira, Wilson, Richard E. Ernst, Mike A. Hamilton, Gabrielle Lima, Amarildo S. Ruiz et Mauro C. Geraldes. « Widespread ca. 1.4 Ga intraplate magmatism and tectonics in a growing Amazonia ». GFF 138, no 1 (24 septembre 2015) : 241–54. http://dx.doi.org/10.1080/11035897.2015.1042033.

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Serre, Simon H., Quinten H. A. van der Meer, Tod E. Waight, James M. Scott, Carsten Münker, Tonny B. Thomsen et Petrus J. le Roux. « Petrogenesis of amphibole megacrysts in lamprophyric intraplate magmatism in southern New Zealand ». New Zealand Journal of Geology and Geophysics 63, no 4 (19 août 2020) : 489–509. http://dx.doi.org/10.1080/00288306.2020.1801771.

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Phipps, Stephen Paul. « Deep rifts as sources for alkaline intraplate magmatism in eastern North America ». Nature 334, no 6177 (juillet 1988) : 27–31. http://dx.doi.org/10.1038/334027a0.

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Artamonov, A. V., et B. P. Zolotarev. « Tectonics and magmatism of intraplate oceanic rises and the hot-spot hypothesis ». Geotectonics 42, no 1 (janvier 2008) : 64–79. http://dx.doi.org/10.1134/s0016852108010068.

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Bush, V. A., et B. A. Kalmykov. « New data on pre-Mesozoic intraplate magmatism in the East European Platform ». Geotectonics 49, no 5 (septembre 2015) : 395–410. http://dx.doi.org/10.1134/s0016852115050027.

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He, Xiao-Fang, et M. Santosh. « Crustal recycling through intraplate magmatism : Evidence from the Trans-North China Orogen ». Journal of Asian Earth Sciences 95 (décembre 2014) : 147–63. http://dx.doi.org/10.1016/j.jseaes.2014.02.011.

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Díaz-Bravo, Beatriz A., Arturo Gómez-Tuena, Carlos Ortega-Obregón et Ofelia Pérez-Arvizu. « The origin of intraplate magmatism in the western Trans-Mexican Volcanic Belt ». Geosphere 10, no 2 (avril 2014) : 340–73. http://dx.doi.org/10.1130/ges00976.1.

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Dawson, J. B. « Neogene–Recent rifting and volcanism in northern Tanzania : relevance for comparisons between the Gardar province and the East African Rift valley ». Mineralogical Magazine 61, no 407 (août 1997) : 543–48. http://dx.doi.org/10.1180/minmag.1997.061.407.06.

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AbstractThe tectonic position of the intraplate, alkaline volcanic province of N. Tanzania in a broad rift-controlled area astride the boundary between the Tanzania Craton and the circum-cratonic Mozambique Fold Belt, strongly resembles that of the Gardar province of S. Greenland. Earlier-identified petrological analogies between Gardar magmatism and that in the Kenya sector of the East African Rift Valley can be extended to volcanism in N. Tanzania, and analogies specifically with the Gardar agpaitic suite are strengthened by the occurrence of eudialyte and aenigmatite in some Tanzanian peralkaline, silicic volcanics.
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Salikhov, D. N., V. V. Kholodnov, V. N. Puchkov et I. R. Rakhimov. « Subduction, collision and plumes in the epoch of the Late Paleozoic magmatism of the Magnitogorsk zone (the Southern Urals) ». LITHOSPHERE, no 2 (12 juin 2019) : 191–208. http://dx.doi.org/10.24930/1681-9004-2019-19-2-191-208.

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Subject. A systematization of Late-Paleozoic magmatic formations of the Magnitogorsk zone of the Southern Urals in the process of an accretion of the Magnitogorsk paleoarc to the margin of the East European continent (EEC) with formation in Famenian and Carboniferous active continent margin of South-Uralian accretionary-collisional belt was given in the work. Materials and methods. A generalization of published and manuscript materials characterizing magmatism and ore-mineralization of Magnitogorsk zone for the Devonian-Carboniferous-Permian time carried out, additional investigations of chemical composition of rocks (XRF, ISP-MS) characterizing process of accretion, subduction and plume activity, microelement distribution in them was made, the composition of rock-forming and accessory minerals (EPMA) was studied. Results. It is found that the South-Uralian accretionary-collisional belt was beginning to form in the late phase of the development of the Magnitogorsk island arc in the process its collision with EEC margin with formation in the Frasnian and Carboniferous of active continental margin. The products of Late-island-arc volcanism are represented by the porphyrite formation and in the eastern frame of the arc - by subalkaline monzonite-shoshonite-latite volcanic-intrusive association with intermediate characteristics between the subductional and interplate formations. Synchronously with them, in the backarc setting, picrite and meymechite volcanics − derivatives of a mantle plume are formed. In process of substitution of tectonic-magmatic regime from island-arc to margin-continental intraplate-type mantle series were forming. During this period, hot asthenospheric diapirs (plumes) were rising to the bottom of new-formed (accreted) margin-continental lithosphere. Along with the magmatic associations of intraplate type and rock series of intermediate geochemical type, this geodynamic situation in the Southern Urals is characterized by a presence of great volumes of mantle-crust granitoids of gabbro-tonalite-granodiorite-granite type, that were formed with a manifold manifestation of anatexis in a time interval of 365-290 Ma. Conclusion. On the whole the originality of Magnitogorsk zone geological history in the Devonian and Carboniferous, peculiarities of magmatic complexes formed here due to various geodynamic settings, are making this zone an extraordinary interesting and important object to study of processes of plume-lithosheric and mantle-crust interaction.
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Gordienko, I. V. « The role of island-arc oceanic, collisional and intraplate magmatism in the formation of continental crust in the Mongolia-Trasnbaikalia region : geostructural, geochronological and Sm-Nd isotope data ». Geodynamics & ; Tectonophysics 12, no 1 (21 mars 2021) : 1–47. http://dx.doi.org/10.5800/gt-2021-12-1-0510.

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The formation of continental crust in the Mongolia-Transbaikalia region is researched to identify the mechanisms of interactions between the crust and the mantle in the development of the Neoarchean, Proterozoic and Paleozoic magmatic and sedimentary complexes in the study area. Using the results of his own studies conducted for many years and other published data on this vast region of Central Asia, the author have analysed compositions, ages and conditions for the formation of Karelian, Baikalian, Caledonian and Hercynian structure-formational complexes in a variety of geodynamic settings. Based on the geostructural, petrological, geochemical, geochronological and Sm-Nd isotope data, he determines the crustal and mantle sources of magmatism, conducts the identification and mapping of isotopic provinces, and reveals the role of island-arc oceanic, accretion-collision and intraplate magmatism in the formation of continental crust. Considering the formation of the bulk continental crust, three main stages are distinguished: (1) Neoarchean and Paleoproterozoic (Karelian) (almost 30% of the crust volume), (2) Meso-Neoproterozoic (Baikalian) (50%), and (3) Paleozoic (Caledonian and Hercynian) (over 20%). This sequence of the evolution stages shows the predominance of the ancient crustal material in igneous rocks sources at the early stage. During the subsequent stages, tectonic structures created earlier were repeatedly reworked, and mixed crustal-mantle and juvenile sources were widely involved in the formation of the bulk continental crust in the study area.
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Sakhno, V. G., et L. S. Tsurikova. « Isotopic and geochemical features of the genesis of igneous complexes and ore-magmatic systems in the Chukotka sector of the Russian Arctic coast ». LITHOSPHERE (Russia) 20, no 2 (25 avril 2020) : 196–211. http://dx.doi.org/10.24930/1681-9004-2020-20-2-196-211.

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Research subject. The isotopic composition (Pb-Pb, Sm-Nd, Rb-Sr, Os/Os, Hf/Hf, 3 He/4 He, etc.) of magmatic complexes and ore-magmatic systems (OMS) of two ore clusters (Kupolsky and Ilirneysky) located in the subpolar Western Chukotka was studied. These ore clusters differ from each other both in their structural position and the age of their magmatic complexes, within which the largest deposits of Au-Ag type are known. Materials and methods. The Pb-Pb, Rb-Sr, SmNd, Re-Os, Lu-Hf, 3 He/4 He, 40Ar/36Ar and sulphur isotopic systems were studied at the VSEGEI centre for isotopic studies (St. Petersburg), as well as at the Institute of Geology, Geochemistry and Ore Deposits (IGEM, Moscow) and the Laboratory of Stable Isotopes of the Far Eastern Geological Institute (FEGI, Vladivostok). Re and Os were measured using an ELEMENT-2 inductively coupled plasma single-collector mass spectrometer. Sulphur isotopic ratios were measured using a Finnigan MAT 253 isotope mass spectrometer. Results and conclusions. On the basis of the isotope-geochemical data obtained, an assumption was made that various deep sources participated in the magma generation, and the differentiated composition of late melts may reflect the melting processes of the crust upper horizons. When comparing the data on the magmatism of the Ilirneysky and Kupolsky ore clusters, a different degree of crustal rock influence on melt generation was revealed. The Kupolsky ore cluster is characterised by a large influence of mantle sources in intraplate magmatism associated with ore formation processes. This is likely to have determined a greater amount of mineralisation in the Kupolsky cluster compared to the Ilirneysky ore cluster.
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O’Connor, Liam, Dawid Szymanowski, Michael P. Eddy, Kyle M. Samperton et Blair Schoene. « A red bole zircon record of cryptic silicic volcanism in the Deccan Traps, India ». Geology 50, no 4 (5 janvier 2022) : 460–64. http://dx.doi.org/10.1130/g49613.1.

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Abstract Silicic magmas within large igneous provinces (LIPs) are understudied relative to volumetrically dominant mafic magmas despite their prevalence and possible contribution to LIP-induced environmental degradation. In the 66 Ma Deccan LIP (India), evolved magmatism is documented, but its geographic distribution, duration, and significance remain poorly understood. Zircons deposited in weathered Deccan lava flow tops (“red boles”) offer a means of indirectly studying potentially widespread, silicic, explosive volcanism spanning the entire period of flood basalt eruptions. We explored this record through analysis of trace elements and Hf isotopes in zircon crystals previously dated by U–Pb geochronology. Our results show that zircon populations within individual red boles fingerprint distinct volcanic sources that likely developed in an intraplate setting on cratonic Indian lithosphere. However, our red bole zircon geochemical and isotopic characteristics do not match those from previously studied silicic magmatic centers, indicating that they must derive from yet undiscovered or understudied volcanic centers associated with the Deccan LIP.
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Ncube, S., H. Wabo, T. M. Owen-Smith, A. P. Gumsley et N. J. Beukes. « The Puduhush gabbro in Griqualand West, South Africa : extending ca. 1.89 to 1.83 Ga intraplate magmatism across the proto-Kalahari Craton ». South African Journal of Geology 126, no 1 (1 mars 2023) : 75–92. http://dx.doi.org/10.25131/sajg.126.0006.

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Abstract The Puduhush gabbro is located on the western margin of the proto-Kalahari Craton in Southern Africa. This gabbro intrudes the Volop Formation, which conformably overlies the Hartley Formation lava of the late Palaeoproterozoic Olifantshoek Group. Here we report a new U-Pb ID-TIMS baddeleyite age as well as petrographic, whole-rock geochemical and palaeomagnetic results for the Puduhush gabbro. The gabbro shows a well-preserved sub-ophitic texture between clinopyroxene and plagioclase, with minor amounts of amphibole, olivine, biotite and Fe-Ti oxides. The new U-Pb ID-TIMS baddeleyite age of 1 881 ± 1 Ma reported here for the Puduhush gabbro, together with existing ages for the Hartley Formation, define a ca.1 916 to 1 881 Ma age bracket for the Volop Formation. Our 1 881 ± 1 Ma age is also within error of ages reported for the oldest episode (so-called Episode 1) of the ca.1.89 to 1.83 Ga magmatism in the eastern and northern parts of the proto-Kalahari Craton. Our geochemical results also suggest compositional similarities between the Puduhush gabbro and Episode 1 magmatism, particularly the post-Waterberg sills. The virtual geomagnetic pole calculated here for the Puduhush gabbro (VGP: 1.6°N; 352.0°E; A95 = 14.2°) is consistent with the Episode 1 pole. All data are therefore combined to produce a new palaeomagnetic pole (11.7°N; 8.8°E, A95 = 9.3°) for Episode 1 magmatism. The present study provides the first evidence that the ca.1.89 to 1.83 Ga magmatism had a wider footprint that previously thought, extending to the western margin of the proto-Kalahari Craton. This wide-scale magmatism, previously proposed to be related to a back-arc extension setting, is here reinterpreted in the context of a mantle plume. Our results are consistent with the lithostratigraphic-based notion that at least parts of the red-bed successions (i.e., Olifantshoek and Waterberg Groups) that are hosts to the ca.1.89 to 1.83 Ga magmatism could be correlative units, representing an extensive sedimentary sequence that once covered large expanses of the proto-Kalahari Craton.
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Likhanov, I. I., V. V. Reverdatto et N. V. Popov. « New data on Late Riphean intraplate granitoid magmatism in the Transangarian Yenisei Ridge ». Doklady Earth Sciences 453, no 1 (novembre 2013) : 1100–1105. http://dx.doi.org/10.1134/s1028334x13110044.

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Stepanenko, V. I. « The Kanin–Timan–Pechora province of Late Devonian intraplate magmatism (position and size) ». Doklady Earth Sciences 467, no 2 (avril 2016) : 337–40. http://dx.doi.org/10.1134/s1028334x16040164.

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Yarmolyuk, V. V., M. I. Kuzmin et R. E. Ernst. « Intraplate geodynamics and magmatism in the evolution of the Central Asian Orogenic Belt ». Journal of Asian Earth Sciences 93 (octobre 2014) : 158–79. http://dx.doi.org/10.1016/j.jseaes.2014.07.004.

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Bayanova, T. B., F. P. Mitrofanov et N. V. Levkovich. « U-Pb geochronology of the intraplate magmatism of the Kola structure, Baltic Shield ». Chinese Science Bulletin 43, S1 (août 1998) : 6. http://dx.doi.org/10.1007/bf02891358.

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Khanchuk, A. I., A. A. Alenicheva, V. V. Golozubov, A. T. Kandaurov, Y. Y. Yurchenko et S. A. Sergeev. « THE KHANKA MASSIF : HETEROGENEITY OF ITS BASEMENT AND REGIONAL CORRELATIONS ». Tikhookeanskaya Geologiya 41, no 4 (2022) : 3–22. http://dx.doi.org/10.30911/0207-4028-2022-41-4-3-22.

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The results of geochronology studies on metagranitoids (U-Pb SIMS) and ophiolites (Sm-Nb) from the Khanka massif are considered. New and published data define the Early Neoproterozoic Matveevka-Nakhimov terrane with early suprasubduction magmatism of 935 and 915 Ma, intraplate and Pacific-type transform margin magmatism of 850-880 and 757 Ma, and the Late Neoproterozoic-Early Cambrian Dvoryan and Tafuin terranes with suprasubduction magmatism of 543, 520, 517 and 513 Ma. Between these two parts of the massif there is a suture (Voznesenka and Spassk terranes) formed by Ediacaran-Cambrian shelf deposits and a Cambrian accretionary prism with ophiolites older than 514 Ma. The greater part of the Khanka massif formed late in the Cambrian with the Kordonka island arc terrane accreted at the end of the Silurian. The Sergeevka terrane of the Ordovician island arc joined it through Early Cretaceous strike-slip movements. Heterogeneous structures of the main part of the Khanka massif can be traced to the north by the analogous stages of magmatism and metamorphism, where the Jiamusi massif (including the East Bureya terrane) is an Early Neoproterozoic block and the eastern Songnen massif (including the West Bureya terrane) is a Late Neoproterozoic-Cambrian block. Between these two blocks is the Spassk-Wuxingzhen-Melgin suture formed by their collision late in the Cambrian. The Bureya-Songnen-Jiamusi-Khanka superterrane formed as a part of the Gondwana supercontinent about 500 Ma ago through orogeny and accretion of the Rodinia supercontinent fragments.
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Imtisunep, Sashimeren, Athokpam Krishnakanta Singh, Rajkumar Bikramaditya, Shoraisam Khogenkumar, Monika Chaubey et Naveen Kumar. « Evidence of intraplate magmatism and subduction magmatism during the formation of Nagaland–Manipur Ophiolites, Indo–Myanmar Orogenic Belt, north‐east India ». Geological Journal 57, no 2 (3 janvier 2022) : 782–800. http://dx.doi.org/10.1002/gj.4378.

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Pirajno, Franco, et M. Santosh. « Rifting, intraplate magmatism, mineral systems and mantle dynamics in central-east Eurasia : An overview ». Ore Geology Reviews 63 (décembre 2014) : 265–95. http://dx.doi.org/10.1016/j.oregeorev.2014.05.014.

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Nikogosian, I. K., A. J. J. Bracco Gartner, M. J. Bergen, P. R. D. Mason et D. J. J. Hinsbergen. « Mantle Sources of Recent Anatolian Intraplate Magmatism : A Regional Plume or Local Tectonic Origin ? » Tectonics 37, no 12 (décembre 2018) : 4535–66. http://dx.doi.org/10.1029/2018tc005219.

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Gao, Shan, Roberta L. Rudnick, Wen-Liang Xu, Hong-Lin Yuan, Yong-Sheng Liu, Richard J. Walker, Igor S. Puchtel et al. « Recycling deep cratonic lithosphere and generation of intraplate magmatism in the North China Craton ». Earth and Planetary Science Letters 270, no 1-2 (juin 2008) : 41–53. http://dx.doi.org/10.1016/j.epsl.2008.03.008.

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Gordienko, I. V., O. R. Minina, L. I. Vetluzhskikh, A. Ya Medvedev et D. Odgerel. « Hentei-Dauria fold system of the Mongolia-Okhotsk belt : magmatism, sedimentogenesis, and geodynamics ». Geodynamics & ; Tectonophysics 9, no 3 (9 octobre 2018) : 1063–97. http://dx.doi.org/10.5800/gt-2018-9-3-0384.

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The geostructural, petrological, geochemical, geochronological and biostratigraphic studies were conducted in the Hentei-Dauria fold system of the Mongolia-Okhotsk orogenic belt. This Paleozoic system is composed mainly of three heterochronous rock associations related to the onset and development of oceanic basins and active margins in the conjugation zone of the Siberian continent and the Mongolia-Okhotsk ocean. This region developed in three stages: (1) Late Caledonian (Ordovician – Early Silurian), (2) Early Hercynian (Late Silurian – Devonian), and (3) Late Hercynian (Carboniferous–Permian). In the Late Caledonian, oceanic seafloor spreading was initiated, deep-sea siliceous deposits were formed, basaltic and andesitic pillow lavas were erupted, and layered and cumulative gabbros, gabbro-dolerite dykes and subduction zones with island-arc magmatism were formed. After a short quiescence period, new zones of spreading and subduction occurred at the active margins of the Mongolia-Okhotsk ocean in the Early Hercynian. In the Late Hercynian, large back-arc sedimentary basins, accretionary prisms and connecting intraplate magmatic complexes were formed in all structures of the Hentei-Dauria fold system. As a result of our studies, we propose a comprehensive model showing the geodynamic development of the Hentei-Dauria fold system that occurred in the area of the Mongolia-Okhotsk Ocean and its margins.
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Moon, Inkyeong, Hyunwoo Lee, Jonguk Kim, Jihye Oh, Donghoon Seoung, Chang Hwan Kim, Chan Hong Park et Insung Lee. « Ti-Magnetite Crystallization in Melt Inclusions of Trachytic Rocks from the Dokdo and Ulleung Islands, South Korea : Implications for Hydrous and Oxidized Magmatism ». Minerals 10, no 7 (20 juillet 2020) : 644. http://dx.doi.org/10.3390/min10070644.

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The Dokdo and Ulleung islands (Korea) are volcanic islands in the East Sea (Sea of Japan), formed in the late Cenozoic. These volcanic islands, in the back-arc basin of the Japanese archipelago, provide important information about magma characteristics in the eastern margin of the Eurasian plate. The origin of the Dokdo and Ulleung intraplate volcanism is still controversial, and the role of fluids, especially water, in the magmatism is poorly understood. Here, we comprehensively analyzed the melt inclusions (10–100 m in diameter) hosted in clinopyroxene phenocrysts of trachyte, trachyandesite, and trachybasalt. In particular, we observed Ti-magnetite and amphibole which were crystallized as daughter mineral phases within melt inclusions, suggesting that Ti-magnetite was formed in an oxidized condition due to H2O dissociation and H2 diffusion. The Ti-magnetite exhibited compositional heterogeneities of MgO (average of 8.28 wt %), Al2O3 (average of 8.68 wt %), and TiO2 (average of 8.04 wt %). The positive correlation of TiO2 with Cr2O3 is probably attributed to evolutionary Fe–Ti-rich parent magma. Correspondingly, our results suggested hydrous and oxidized magmatism for the Dokdo and Ulleung volcanic islands.
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Manjón-Cabeza Córdoba, Antonio, et Maxim D. Ballmer. « The role of edge-driven convection in the generation ofvolcanism – Part 2 : Interaction with mantle plumes, applied to the Canary Islands ». Solid Earth 13, no 10 (21 octobre 2022) : 1585–605. http://dx.doi.org/10.5194/se-13-1585-2022.

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Abstract. In the eastern Atlantic Ocean, several volcanic archipelagos are located close to the margin of the African continent. This configuration has inspired previous studies to suggest an important role of edge-driven convection (EDC) in the generation of intraplate magmatism. In a companion paper (Manjón-Cabeza Córdoba and Ballmer, 2021), we showed that EDC alone is insufficient to sustain magmatism of the magnitude required to match the volume of these islands. However, we also found that EDC readily develops near a step of lithospheric thickness, such as the oceanic–continental transition (“edge”) along the western African cratonic margin. In this work, we carry out 3D numerical models of mantle flow and melting to explore the possible interactions between EDC and mantle plumes. We find that the stem of a plume that rises close to a lithospheric edge is significantly deflected ocean-ward (i.e., away from the edge). The pancake of ponding hot material at the base of the lithosphere is also deflected by the EDC convection cell (either away or towards the edge). The amount of magmatism and plume deflection depends on the initial geometric configuration, i.e., the distance of the plume from the edge. Plume buoyancy flux and temperature also control the amount of magmatism, and influence the style and extent of plume–EDC interaction. Finally, comparison of model predictions with observations reveals that the Canary plume may be significantly affected and deflected by EDC, accounting for widespread and coeval volcanic activity. Our work shows that many of the peculiar characteristics of eastern Atlantic volcanism are compatible with mantle plume theory once the effects of EDC on plume flow are considered.
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He, Xiao-Fang, M. Santosh et Sohini Ganguly. « Mesozoic felsic volcanic rocks from the North China craton : Intraplate magmatism associated with craton destruction ». Geological Society of America Bulletin 129, no 7-8 (23 février 2017) : 947–69. http://dx.doi.org/10.1130/b31607.1.

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