| Geochronology and Petrogenesis for the Protolith of Biotite Plagioclase Gneiss at Lianghe, Western Yunnan |
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| 作者姓名： | CONG Feng LIN Shiliang ZOU Guangfu XIE Tao LI Zaihui TANG Fawei PENG Zhimin |
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| 作者单位： | Chengdu Center of China Geological Survey, Chengdu 610081, China |
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| 基金项目： | supported by China Geological Survey(Grant No. 1212010784007) |
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| 摘 要： | In this paper,we report an integrated study of U-Pb age and Hf isotope compositions of zircons from biotite plagioclase gneiss at Lianghe in western Yunnan.The zircons preserved inherited core and rim texture.Igneous zircon grains and rims yielded a weighted mean ~(206)Pb/~(238)U age of 120.4±1.7 Ma,theirε_(Hf)(120 Ma)values were mainly negative ranging from-13.9 to-10.7,with Hf model ages between 1.9 Ga and 2.0 Ga,some zircons had positiveε_(Hf)(120 Ma)values ranging from 0.2 to 2.1.The inherited cores ...
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| 关 键 词： | 品石 产气 |
| 收稿时间： | 1/1/2011 12:00:00 AM |
| 修稿时间： | 2011/3/30 0:00:00 |
Geochronology and Petrogenesis for the Protolith of Biotite Plagioclase Gneiss at Lianghe, Western Yunnan |
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| Authors: | CONG Feng LIN Shiliang ZOU Guangfu XIE Tao LI Zaihui TANG Fawei and PENG Zhimin |
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| Institution: | CONG Feng~*,LIN Shiliang,ZOU Guangfu,XIE Tao,LI Zaihui,TANG Fawei and PENG Zhimin Chengdu Center of China Geological Survey,Chengdu 610081,China |
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| Abstract: | In this paper, we report an integrated study of U‐Pb age and Hf isotope compositions of zircons from biotite plagioclase gneiss at Lianghe in western Yunnan. The zircons preserved inherited core and rim texture. Igneous zircon grains and rims yielded a weighted mean 206Pb/238U age of 120.4±1.7 Ma, their εHf (120 Ma) values were mainly negative ranging from –13.9 to –10.7, with Hf model ages between 1.9 Ga and 2.0 Ga, some zircons had positive εHf (120 Ma) values ranging from 0.2 to 2.1. The inherited cores showed the wide variations in the U‐Pb age of 375–1315 Ma. One of them showed the εHf (506 Ma) value of –4.2, it was similar to the gray gneiss of old crust, which εHf (500 Ma) values were negative ranging from –4.5 to –3.3. Combining geological feature and geochemical data, we concluded that the protolith of biotite plagioclase gneiss was old crust‐derived tonalitic magma during the early Cretaceous. |
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| Keywords: | zircon U-Pb age Hf isotope Lianghe western Yunnan |
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