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Mafic intrusive rocks are widely exposed in the Motuo tectono-magmatic belt, southeast Lhasa terrane. LA–ICP-MS U–Pb zircon dating shows that they have magma crystallization ages of 69 and ca. 50Ma. These mafic intrusive rocks are characterized by variable SiO2 (44.60–57.60wt.%), high Al2O3 (17.19–20.86wt.%), and low MgO (1.85–5.38wt.%) with Mg# of 31–55. Their chemical composition is comparable with...
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...
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