Bashikaogong-Shimierbulake granitic complex, north Altun, NW China: Geochemistry and zircon SHRIMP ages
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- 作者：Cailai Wu (1)
Sunzhi Yao (2)
Lingsen Zeng (1)
Jingsui Yang (1)
Joseph L. Wooden (3)
Songyong Chen (1)
Frank K. Mazdab (3) - 关键词：quartz diorite ; granite ; zircon SHRIMP U ; Pb dating ; Bashikaogong ; Shimierbulake
- 刊名：Science China Earth Sciences
- 出版年：2006
- 出版时间：December 2006
- 年：2006
- 卷：49
- 期：12
- 页码：1233-1251
- 全文大小：16372KB
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Sunzhi Yao (2)
Lingsen Zeng (1)
Jingsui Yang (1)
Joseph L. Wooden (3)
Songyong Chen (1)
Frank K. Mazdab (3)
1. Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037, China
2. Anhui Academy of Geological Survey, Hefei, 230001, China
3. Stanford University, CA, 94305, USA - ISSN：1869-1897
文摘
The Bashikaogong-Shimierbulake granitoid complex is about 30 km long and 2- 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 granites 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 481.6±5.6 Ma for quartz diorite, 437.0±3.0 Ma-33.1±3.4 Ma for grey granite and 443±11 Ma-34.6±1.6 Ma for pink granite, respectively. Combined with regional geology, we think that the quartz diorite formed in tectonic environment related to oceanic crust subduction and the granites in post-collision.