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| Bashikaogong-Shimierbulake granitic complex, north Altun, NW China:Geochemistry and zircon SHRIMP ages | |
| 作者姓名： | Joseph L. Wooden Frank K. Mazdab |
| 基金项目： | 国家自然科学基金;中国地质调查局勘测项目;国家重点基础研究发展计划(973计划);国家重点基础研究发展计划(973计划) |
| 摘 要： | 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 481.6±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 subduction and the granites in post-collision. |
| 收稿时间： | 21 July 2005 |
| 修稿时间： | 15 December 2005 |
Bashikaogong-Shimierbulake granitic complex, north Altun, NW China: Geochemistry and zircon SHRIMP ages |
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| Joseph L. Wooden,Frank K. Mazdab.Bashikaogong-Shimierbulake granitic complex, north Altun, NW China:Geochemistry and zircon SHRIMP ages[J].Science in China(Earth Sciences),2006,49(12):1233-1251. | |
| Authors: | WU Cailai YAO Sunzhi ZENG Lingsen YANG Jingsui Joseph LWooden CHEN Songyong Frank KMazdab |
| Institution: | 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 |
| Abstract: | 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 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—433.1±3.4 Ma for grey granite and 443±11 Ma—434.6±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. |
| Keywords: | quartz diorite granite zircon SHRIMP U-Pb dating Bashikaogong-Shimierbulake |
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