Results 181 to 190 of about 1,193 (219)

EXTREME FRACTIONATION AND DEFORMATION OF THE LEUCOGRANITE - PEGMATITE SUITE AT RED CROSS LAKE, MANITOBA, CANADA. II. PETROLOGY OF THE LEUCOGRANITES AND PEGMATITES

The Canadian Mineralogist, 2012
Spatial relations and bulk chemical compositions of three bodies of multiphase leucogranites and two categories of granitic pegmatites in the Archean Red Cross Lake greenstone belt, Sachigo Subprovince of the Superior Province in the Canadian Shield, indicate a comagmatic origin and an enormous range of fractionation.
P. Cerny, N. M. Halden, K. Ferreira, R. E. MEINTZER, W. C. Brisbin, L. E. Chackowsky, M. T. Corkery, F. J. Longstaffe, D. L. Trueman   +8 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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Lithium-bearing phosphates and micas in Homolka leucogranite

Geoscience Research Reports, 2022
Homolka granite forms intrusion of highly fractionated leucocratic magma which belongs to the youngest members of the Moldanubian Pluton. The age of the intrusion was estimated between 319 and 315 Ma. The Homolka granite is P-rich, peraluminous and strongly enriched in Li, Rb, Cs, Sn, Nb, Ta and F, showing high U (8–20 ppm) and low Th (< 3 ppm ...
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The role of fluids in the formation of High Himalayan leucogranites

Geological Society, London, Special Publications, 1993
Abstract During fractional melting of the crust, the availability of fluids is a critical variable that influences the melt fraction obtained, the capacity of the melt to migrate from its source and the relationship between melting and uplift.
Nigel Harris, John Massey, Simon Inger
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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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Petrogenesis of monzonites and leucogranites in the Ama Drime Massif: Implications for sources and differentiation of Himalayan leucogranites

Journal of Asian Earth Sciences, 2022
Daxiang Gu, Jinjiang Zhang, Chao Lin, Jianlei Zheng, Lin Feng, Yunsong Fan, Baoyou Huang   +6 more
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The Formation and Age of Leucogranitic Melt in the Garhwal Himalaya

2023
Metamorphism during orogenic evolution results in the melting of high-grade metamorphic rocks which dramatically decreases mechanical strength, activates shear zones, and may consequently initiate exhumation. The timescales of anatexis, melt amalgamation, migration, and emplacement are the focus of active research and have critical implications for ...
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Cesium-rubidium mineralization in Himalayan leucogranites

Science China Earth Sciences, 2023
Fangyang Hu, Xiaochi Liu, Shaoxiong He, Jiamin Wang, Fuyuan Wu   +4 more
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The Isotopic Characterization of Aqueous and Leucogranitic Crustal Fluids

1989
The H- and O-isotope characteristics of the principal water types - sea, meteoric, formation, organic, metamorphic, magmatic and hydrothermal-are outlined. Sea and meteoric surface waters can be involved with deep crustal processes following their downward penetration, or by their upward infiltration after oceanic or continental subduction processes ...
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Himalayan leucogranites and migmatites: nature, timing and duration of anatexis

Journal of Metamorphic Geology, 2016
AbstractWidespread anatexis was a regional response to the evolution of the Himalayan‐Tibetan Orogen that occurred some 30 Ma after collision between Asia and India. This paper reviews the nature, timing, duration and conditions of anatexis and leucogranite formation in the Greater Himalayan Sequence (GHS), and compares them to contemporaneous granites
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