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CHARACTERISTICS AND TECTONIC SETTING OF THE PERMIAN VOLCANIC ROCKS IN BOLE AREA, XINJIANG |
PAN Ming-chen, YU Hai-feng, WANG Fu-jun, LIANG You-wei, DING Wei, LI Yan, XU Gui-yan |
Liaoning Institute of Geological Survey, Dalian 116100, Liaoning Province, China |
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Abstract The volcanic rocks of Wulang formation are scattered in the Late Paleozoic Alataw continental marginal basin near the contact between Ili micro-plate and Junggar micro-plate of the Kazakhstan-Junggar plate. The volcanic activities are relatively weak, with basic, intermediate and acid magma. The tectonic environment of the tephrite in the area is intraplate; while that of the andesite and rhyolite is intracontinental collision orogenic belt. The alkalinity of the tephrite of Wulang formation is strong. The andesite, rhyolite and rhyolite porphyry are sub-alkaline. The Rb-Sr isotopic age of the intermediate andesite is 282.5±2.6 Ma, in Early Permian. It can be inferred that, in Alataw area, the Ili micro-plate and Junggar micro-plate have been sutured since Early Permian, forming intracontinental fault basin, with the development of continental volcanic-clastic rock formation.
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Received: 07 June 2010
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