Geochemistry and zircon SHRIMP U-Pb dating of granitoids from the west segment of the North Qaidam

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; 46...

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Bibliographic Details
Published in:Science China. Earth sciences 2009-11, Vol.52 (11), p.1771
Main Authors: Wu, Cailai, Wooden, Joseph L, Robinson, Paul T, Gao, Yunhong, Wu, Suoping, Chen, Qilong, Mazdab, Frank K, Mattinson, Chris
Format: Article
Language:English
Subjects:
Continental margins
Geochemistry
Granite
Igneous rocks
Island arcs
Oceanic crust
Ordovician
Paleozoic
Permian
Shellfish
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Summary: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. [PUBLICATION ABSTRACT]
ISSN:1674-7313
1869-1897
DOI:10.1007/s11430-009-0147-3