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The petrogenesis of high Sr/Y-type magmas is still open to debate. Usually, such magmas could result from melting under high-pressure settings (>12kbar). In this paper, we gave an example that some high Sr/Y-type magmas could originate from melting of crustal materials at pressure of 10–12kbar. We carried out a study of petrogenesis for Devonian high Sr/Y granites from the Beidashan batholith (397–411Ma),...
Early Paleogene granitoids in Southern Lhasa subterrane have been widely investigated and many petrogenesis and geodynamic models have been proposed in the past few years. However, contemporaneous granitoids in the Motuo tectono-magmatic belt, southeast Lhasa terrane, are still limitedly studied. Here we present the petrology, zircon U–Pb geochronology, whole-rock geochemistry, and Sr–Nd–Hf isotope...
Whole-rock geochemistry, Sr–Nd isotope and zircon U–Pb isotope data are reported for seven granitoid intrusions from the eastern Lhasa terrane. Our zircon U–Pb data exhibit three periods of magmatism: 164–125Ma, 83Ma, and 71–45Ma. Granitoids from the Middle Jurassic to Early Cretaceous (164–125Ma) display evolved Nd isotope composition, with ε Nd (t)=−8.6 to −15.5 and T 2DM =1.6 to...
Post-collisional high Sr/Y-type magmatism in the southern Lhasa terrane extends ~1500km along the strike of the orogen. The origin and magma generation mechanism for these rocks remain controversial. We report a detailed study of such high Sr/Y-type magmatism in the east Himalayan syntaxis, SE Tibet, and explain its significance for understanding post-collisional geodynamical processes. The two-mica...
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