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Himalayan Leucogranites: Field Relationships and Tectonics
ElementsHimalayan 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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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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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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Himalayan Leucogranites: A Minimal Role in Deformation
ElementsA popular model of Himalayan metamorphic and structural evolution argues that partial melting of deeply buried rocks triggered crustal weakening, ductile flow, orogenic collapse, and genesis of leucogranites. Here, we review the origins and evolution of partial melts and leucogranites to demonstrate that they are largely incidental to deformation ...
Matthew J. Kohn +2 more
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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 +8 more
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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 +8 more
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Lithium-bearing phosphates and micas in Homolka leucogranite
Geoscience Research Reports, 2022Homolka 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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Granites, Leucogranites, Himalayan Leucogranites…
ElementsPREFACE 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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Leucogranites and the Time of Extension in the East Greenland Caledonides
The Journal of Geology, 2005Abstract Leucogranites provide timing estimates for deformation, particularly extension, in many orogens. On this basis, the time of extension in the East Greenland Caledonides has been estimated at 420–430 Ma. U‐Pb SHRIMP (sensitive, high‐resolution ion‐microprobe) analysis of zircon and monazite from selected leucogranites was undertaken to establish
Jane A. Gilotti, William C. McClelland
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Himalayan Leucogranites: Rare-metal Resources
ElementsHimalayan 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 +4 more
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Tectonic record, magmatic history and hydrothermal alteration in the Hercynian Guérande leucogranite, Armorican Massif, France [PDF]
, 2015 International audienceThe Guérande peraluminous leucogranite was emplaced at the end of the Carboniferous in the southern part ofthe Armorican Massif. At the scale of the intrusion, this granite displays structural heterogeneities with a weakdeformation ...
C. Ballouard +6 more
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Geochemical comparison between Himalayan and Hercynian leucogranites
Physics of the Earth and Planetary Interiors, 1984Abstract 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 +5 more
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