| Zircon SHRIMP U-Pb geochronology and petrogenesis of the plagiogranites from the Lagkor Lake ophiolite, Gerze, Tibet, China |
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| 作者姓名： | ZHANG YuXiu ZHANG KaiJun LI Bing WANG Yang WEI QingGuo TANG XianChun |
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| 作者单位： | [1]Key laboratory of Marginal Sea Geology, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China; [2]Graduate University, Chinese Academy of Sciences, Beijing 100039, China; [3]Department of Earth Sciences, Nanjing University, Nanjing210093, China |
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| 基金项目： | Supported by the CAS Hundred Talents Project, the National Natural Science Foundation of China （Grant No. 40572137）, and partly by the Key Laboratory of Isotope Geochronology and Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences |
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| 摘 要： | Field relationship, along with petrographical, petrological, and geochemical characteristics, and zircon populations, indicates that the plagiogranites from the Lagkor Lake ophiolite in the Bangong-Nujiang suture zone (~ 20 km south of Gerze County, central Tibet, China), derived from anatexis of hydrated gabbros by ductile shearing during transport of the oceanic crust. Therefore, this kind of plagiogranite is coeval to or little later than the spreading of the oceanic crust. Zircon SHRIMP age of 166 ± 2.5 Ma for the plagiogranites indicates that an oceanic basin existed in the western part of the Bangong-Nujiang zone in the Middle Jurassic.
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| 关 键 词： | 西藏 改则县 拉果错 湖泊 蛇绿岩 斜长花岗岩 锆SHRIMP U-Pb地质年代 岩石成因 |
| 收稿时间： | 26 June 2006 |
| 修稿时间： | 2006-06-262006-08-11 |
Zircon SHRIMP U-Pb geochronology and petrogenesis of the plagiogranites from the Lagkor Lake ophiolite,Gerze, Tibet,China |
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| ZHANG YuXiu ZHANG KaiJun LI Bing WANG Yang WEI QingGuo TANG XianChun.Zircon SHRIMP U-Pb geochronology and petrogenesis of the plagiogranites from the Lagkor Lake ophiolite, Gerze, Tibet, China[J].Chinese Science Bulletin,2007,52(5):651-659. |
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| Authors: | Zhang YuXiu Zhang KaiJun Li Bing Wang Yang Wei QingGuo Tang XianChun |
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| Institution: | (1) Key Laboratory of Marginal Sea Geology, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China;(2) Graduate University, Chinese Academy of Sciences, Beijing, 100039, China;(3) Department of Earth Sciences, Nanjing University, Nanjing, 210093, China |
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| Abstract: | Field relationship, along with petrographical, petrological, and geochemical characteristics, and zircon populations, indicates
that the plagiogranites from the Lagkor Lake ophiolite in the Bangong-Nujiang suture zone (∼ 20 km south of Gerze County,
central Tibet, China), derived from anatexis of hydrated gabbros by ductile shearing during transport of the oceanic crust.
Therefore, this kind of plagiogranite is coeval to or little later than the spreading of the oceanic crust. Zircon SHRIMP
age of 166 ± 2.5 Ma for the plagiogranites indicates that an oceanic basin existed in the western part of the Bangong-Nujiang
zone in the Middle Jurassic.
Supported by the CAS Hundred Talents Project, the National Natural Science Foundation of China (Grant No. 40572137), and partly
by the Key Laboratory of Isotope Geochronology and Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences |
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| Keywords: | Tibet Gerze plagiogranite zircon SHRIMP U-Pb geochronology |
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