2017 Vol. 36, No. 5
Article Contents

JIN Xinbiao, WANG Lei, XIANG Hua, LIU Zhongpeng, DUAN Guiling, LI Ziyun. Petrogenesis of diabase from Jiangshiqiao in Taojiang City, Hu'nan Province:Constrains from geochemistry, geochronology and Sr-Nd-Pb isotopes[J]. Geological Bulletin of China, 2017, 36(5): 750-760.
Citation: JIN Xinbiao, WANG Lei, XIANG Hua, LIU Zhongpeng, DUAN Guiling, LI Ziyun. Petrogenesis of diabase from Jiangshiqiao in Taojiang City, Hu'nan Province:Constrains from geochemistry, geochronology and Sr-Nd-Pb isotopes[J]. Geological Bulletin of China, 2017, 36(5): 750-760.

Petrogenesis of diabase from Jiangshiqiao in Taojiang City, Hu'nan Province:Constrains from geochemistry, geochronology and Sr-Nd-Pb isotopes

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  • Zircon LA-ICP-MS U-Pb dating for diabase from Jiangshiqiao in Taojiang City of Hu'nan Province yielded an emplace-ment age of 229±2.3Ma (n=8, MSWD=1.8, 2σ).The diabase is characterized by low values of potassium (K2O/Na2O=0.14~0.16), and alkali (K2O+Na2O=2.89%~2.96%), enrichment of large ion lithophile elements and LREE and depletion of high field strength el-ements, low (87Sr/86Sr)i ratios (0.70606~0.70644), low positive ε Nd(t) values (1.55~1.87) and enrichment of radioactive Pb, suggesting a mixed source of the depleted mantle (DM) and the lower crustal.In combination with previous studies, the authors hold that the di-abase was formed through partial melt of the mantle and lower crustal components by the upwelling asthenosphere during the Indo-sinian post-orogenic lithosphere extension in Hu'nan Province.

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