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| Geochemical Characteristics of Basic-intermediate Volcanic Rocks from Jinshajiang Belt in Northwestern Yunnan, China |
| XIE Jing1,4, ZHU Bing-quan2, CHANG Xiang-yang2,3 |
1. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;
2. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;
3. School of Environmental Science & Engineering, Guangzhou University, Guangzhou 510405, China;
4. Graduate School, Chinese Academy of Sciences, Beijing 100039, China |
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Abstract In order to discuss the tectonic setting and evolution of Jinshajiang area, systematic geochemical studies of major elements, trace elements and Sr-Nd isotopes are performed for basic-intermediate volcanic rocks from Dongzulin,Benzilan,Pantiange and Shigu, and gabbros from Dongzhulin in Jinshajiang belt, northwestern Yunnan. Age of gabbroic rocks from the Dongzhulin area was determined by Sm-Nd isochronal method. It indicated that the Devonian to Triassic volcanic rocks outcropped in Jinshajiang belt were formed in different tectonic environments, such as back-arc basin, initial rift, island arc, and so on. Our studies provide new evidences for the archipelagic evolutionary model with multi-rift and multi-subduction of Jinshajiang belt.
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Received: 09 July 2005
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