Geochemistry and zircon SHRIMP U-Pb dating of granitoids from the west segment of the North Qaidam |
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Authors: | CaiLai Wu Joseph L Wooden Paul T Robinson YunHong Gao SuoPing Wu QiLong Chen Frank K Mazdab Chris Mattinson |
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Institution: | 1.Institute of Geology,Chinese Academy of Geological Sciences,Beijing,China;2.Department of Earth and Environmental Sciences,Stanford University,Stanford,USA;3.Department of Earth Sciences,Dalhousie University,Halifax,Canada |
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Abstract: | Granitoid intrusives such as Saishitenshan, Tuanyushan, Aolaohe and Sanchagou occur widely in the western segment of North
Qaidam. All these bodies trend NW, roughly parallel to the regional structure. Zircon SHRIMP dating for these granites show
that they range in age from Ordovician to Permian; 465.4±3.5 Ma for Saishitenshan, 469.7±4.6 Ma and 443.5±3.6 Ma for Tuanyushan,
372.1±2.6 Ma for Aolaohe, and 271.2±1.5 Ma and 259.9±1.2 Ma for Sanchagou. Both the Tuanyshan and Aolaohe plutons record two
distinct intrusive events. Geochemically, the early Paleozoic granites have an island arc or active continental margin affinity,
and their protolith may have been Mesoproterozoic oceanic crust derived from depleted mantle. The protolith of the late Paleozoic
granites may have been Mesoproterozoic lower crust from the root of an island arc with the magmas reflecting a mixture of
mantle and crustal material. |
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