ZIRCON LA-ICP-MS U-Pb GEOCHRONOLOGY OF THE DIABASE DIKES IN AOHAN QI, INNER MONGOLIA: Indication for the Activity of Chifeng-Kaiyuan Deep Fault
CHEN Jing-sheng1, LU Chong-hai2, LI Bin1, LI Wei1, LIU Miao1
1. Shenyang Institute of Geology and Mineral Resources, CGS, Shenyang 110034, China; 2. Liaoning Institute of Mineral Exploration, Shenyang 110000, China
Abstract：Diabase dikes, which are derived from the mantle, can be used as an indicator of deep fault activities. During the 1:50000 geology survey in Aohan Qi area, Inner Mogolia, the authors identified near east-west extended diabase dikes in the Paleoproterozoic Baoyintu group in Xingjiawopu. The zircon U-Pb LA-ICP-MS dating of the diabase dikes show five age groups:603-521 Ma, 450 Ma, 259-262 Ma, 237 Ma and 167.4±3.0 Ma. The youngest age (167.4±3.0 Ma) represents the cooling age of the dikes, indicating the activation of Chifeng-Kaiyuan deep fracture in Middle Jurassic. The other ages are also corresponding to the magmatic activities of different periods in Chifeng area. The formation and evolution of the Chifeng-Kaiyuan deep fault are summarized by combination with previous literatures.
陈井胜, 卢崇海, 李斌, 李伟, 刘淼. 内蒙古敖汉旗辉绿岩脉体LA-ICP-MS锆石U-Pb年代学——对赤峰-开原深断裂活动的指示[J]. 地质与资源, 2015, 24(6): 521-525.
CHEN Jing-sheng, LU Chong-hai, LI Bin, LI Wei, LIU Miao. ZIRCON LA-ICP-MS U-Pb GEOCHRONOLOGY OF THE DIABASE DIKES IN AOHAN QI, INNER MONGOLIA: Indication for the Activity of Chifeng-Kaiyuan Deep Fault. GEOLOGY AND RESOURCES, 2015, 24(6): 521-525.
2015, Vol. 24 
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