Petrogenesis of the early Eocene I-type granites in west Yingjiang (SW Yunnan) and its implication for the eastern extension of the Gangdese batholiths
作者： Liyan Ma , Yuejun Wang , Weiming Fan , Hongyan Geng , Yongfeng Cai
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摘要: Abstract This study reports new zircon U–Pb and Hf isotopes whole-rock elemental Sr–Nd isotopic data for the gneissic granite leucogranite from Nabang metamorphic zone, Yingjiang area (West Yunnan, SW China). The metamorphosed granitoids crystallized during early Eocene (~ 55–50 Ma) with zircons showing eHf(t) values + 11 to − 5.3 crustal model ages of 1.5 0.42 Ga, comparable those coeval I-type Gangdese batholith, southern Lhasa. rocks are characterized by metaluminous weakly peraluminous hornblende-bearing granites A/CNK = 0.95–1.09, Na2O > K2O, coupled low initial Sr 0.7049–0.7070 high eNd(t) + 1.1 − 7.1. were derived materials involving ancient upper crust/sedimentary juvenile mantle-derived rocks. Together available nearby regions, it is proposed that in Tengliang can be correlated represent southeastward continuation magmatic arc resulting Neotethyan subduction Tibet. petrogenesis western Yunnan was probably related rollback subducting slab caused remelting newly modified underplated basaltic magma.
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