Precambrian origin of the North Lhasa terrane, Tibetan Plateau: Constraint from early Cryogenian back-arc magmatism
作者： Pei-yuan Hu , Qing-guo Zhai , Jun Wang , Yue Tang , Hai-tao Wang
DOI: 10.1016/J.PRECAMRES.2018.05.014
关键词:
摘要: Abstract The origin of ancient continental blocks in the Tibetan plateau and their paleogeographic locations Rodinia supercontinent remain enigmatic. Here, we report early Cryogenian metamorphic magmatic rocks (including amphibolites granitic gneisses) from North Lhasa terrane central Plateau. (ca. 822 Ma) are tholeiitic exhibit both MORB- (e.g., flat patterns rare-earth high field strength elements) arc-like elevated Th/Yb tatios) geochemical affinities. In combination with positive zircon eHf(t) (+6.9 to +12.4) whole-rock eNd(t) (+4.4 +10.4) low δ18O (4.87 5.81‰) values, data indicate a depleted mantle source affected by subduction components. gneisses 810 806 Ma) A2-type granitoids have relatively lower (+4.7 +6.9) (+3.5) higher (5.44–8.08‰) values. Their protoliths were probably generated partial melting Mesoproterozoic crustal rocks. geochemically distinct rift-related interior but similar coeval back-arc at northwestern edge supercontinent, thus providing new constraints on location terrane.
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