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    Bashikaogong-Shimierbulake granitic complex, north Altun, NW China Geochemistry and zircon SHRIMP ages [查看] WUCailai、YAOSunzhi、ZENGLingsen、YANGJingsui、JosephL.Wooden、CHENSongyong1&FrankK.Mazdab
    The Bashikaogong-Shimierbulake granitoid complex is about 30 km long and 2 ―6 km wide, with an area of 140 km2, located at the north margin of the Bashikaogong Basin in the north Altun terrain. It intruded into schist, metapelite and metatuff of Precambrian ages. This granitoid complex consists of darkish quartz diorite, grey granite, pink granite and pegmatite. Geochemically, the quartz diorite has I-type granite affinity and belongs to Calc-alkaline sereies, and the other gran-ites have S-type affinity and to high-K calc-alkaline series. Zircon SHRIMP U-Pb dating shows that the quartz diorite has a bigger age than those of other granites, which is 4 81.6±5.6 Ma for quartz diorite, 437.0±3.0 Ma―433.1±3.4 Ma for grey granite and 443±11 Ma―434.6±1.6 Ma for pink granite, re-spectively. Combined with regional geology, we think that the quartz diorite formed in tectonic envi-ronment related to oceanic crust subduc tion and the granites in post-collision.
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