Results 171 to 180 of about 3,780 (205)

Himalayan Leucogranites: Rare-metal Resources

Elements
Himalayan leucogranites were once overlooked for rare-metal resources because they initially were thought to have formed by in-situ partial melting of underlying high-grade metamorphic rocks. However, recent findings have revealed widespread rare-metal mineralizations of Be, Nb/Ta, Li/Rb/Cs, and W/Sn associated with leucogranites in the area ...
Fu-Yuan Wu, Xiao-Chi Liu, Fang-Yang Hu, Lei Xie, Ru-Cheng Wang   +4 more
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Geochemical comparison between Himalayan and Hercynian leucogranites

Physics of the Earth and Planetary Interiors, 1984
Abstract Isotopic (Sr, Pb, Nd, O), REE and trace element data from three Himalayan (Nepal) and six Hercynian (Brittany, France) leucogranites are compared. For the Himalayan granites—Makulu, Mustang and especially Manaslu—the 87Sr/86Sr versus 87Rb/86Sr scatter diagrams, and hence variability of the initial 87Sr/86Sr ratios, reflect heterogeneity of ...
Ph. Vidal, J. Bernard-Griffiths, A. Cocherie, P. Le Fort, J.J. Peucat, S.M.F. Sheppard   +5 more
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Himalayan Leucogranites: A Geochemical Perspective

Elements
The geochemical characterization of Himalayan leucogranites offers important insights into both their petrogenesis and Himalayan orogenic processes. Himalayan leucogranites are characterized by strongly peraluminous compositions that are comparable to melts derived from anatexis of sedimentary rocks.
Ze-Zhou Wang, Fang-Zhen Teng, Lingsen Zeng, Zhi-Chao Liu   +3 more
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Highly fractionated Himalayan leucogranites and associated rare-metal mineralization

Lithos, 2020
Abstract The formation of the Himalaya was associated with the exhumation of high-grade metamorphosed rocks of the Higher Himalayan sequence (HHS) complex, which underwent amphibolite-, granulite- to eclogite-facies metamorphism and anatexis. Occurring along the Himalayan mountain crest in the south and the Lhagoi Kangri mountain in the north, the ...
Fu-Yuan Wu, Xiao-Chi Liu, Zhi-Chao Liu, Ru-Cheng Wang, Lei Xie, Jia-Min Wang, Wei-Qiang Ji, Lei Yang, Chen Liu, Gautam Prashad Khanal, Shao-Xiong He   +10 more
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Leucogranites of the Himalaya/Karakoram: implications for magmatic evolution within collisional belts and the study of collision-related leucogranite petrogenesis

Journal of Volcanology and Geothermal Research, 1990
Abstract Two types of leucogranite have been identified in a collisional setting in the Himalaya. Type-a (e.g., Manaslu, High Himalaya) are syn-tectonic crustal melts related to “hot over cold” thrusting and subsequent fluid fluxing. Type-b (e.g., Baltoro, Karakoram) is related to lower crustal melting during/following crustal thickening and thermal ...
Mark B. Crawford, Brian F. Windley
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Petrogenesis of leucogranites in collisional orogens

Geological Society, London, Special Publications, 2019
Abstract Leucogranites are a characteristic feature of collisional orogens. Their generation is intimately related to crustal thickening and the active deformation and metamorphism of metapelites. Data from Proterozoic to present day orogenic belts show that collisional leucogranites (CLGs) are peraluminous, with muscovite ...
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Late Vendian postcollisional leucogranites of Yenisei Ridge

Doklady Earth Sciences, 2017
The Late Vendian (540–550 Ma) U–Pb zircon age of postcollisional granitoids in the Osinovka Massif was obtained for the first time. The Osinovka Massif is located in rocks of the island-arc complex of the Isakovka Terrane, in the northwestern part of the Sayany–Yenisei accretion belt. These events stand for the final stage of the Neoproterozoic history
A. D. Nozhkin, I. I. Likhanov, V. V. Reverdatto, T. B. Bayanova, S. V. Zinoviev, P. S. Kozlov, N. V. Popov, N. V. Dmitrieva   +7 more
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Granites, Leucogranites, Himalayan Leucogranites…

Elements
PREFACE I am not an expert on Himalayan leucogranites, although I have followed their coverage in the literature for more than 40 years and have studied granites and rhyolites more generally for over 50 years (cf. Fig. 1). Coming from this perspective, I aim—in this Elements Perspective—to provide a felsic magma context for pondering ...
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Himalayan Leucogranites: Field Relationships and Tectonics

Elements
Himalayan peraluminous leucogranites were derived from in-situ melting of sillimanite + K-feldspar-bearing pelite-migmatite, and were transported via layer-parallel sill complexes and cross-cutting dykes to feed giant sills up to 5 km thick. Partially melted Himalayan middle crust was extruded southwards between two large-scale, north-dipping ...
Mike Searle, John Cottle
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Lithogeochemical exploration for uranium in leucogranites

Journal of Geochemical Exploration, 1989
Abstract In certain leucogranitic massifs in France and Spain, anomalies of uranium that extend for kilometers have been observed in rocks close to uranium deposits. Some of these anomalies were used to direct a reconnaissance survey which led to the discovery of a small blind deposit.
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