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. |
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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① | 湖南省地质调查院, 益阳幅(H49 C 004003)1: 250000区域地质调查报告. 2002. |
② | 湖南省地质调查院, 湖南省区域地质志. 2013. |
③ | 湖南省地质调查院, 株洲幅(G49 C 003004)1: 250000区域地质调查报告. 2005. |
Geological map of Taojiang area in Hu'nan Province
Photograph and photomicrographs of the diabase from Jiangshiqiao in the Taojiang area
Representative cathodoluminescence (CL) images for zircons of the diabase from Jiangshiqiao in the Taojiang area
U-Pb concordia diagrams for zircons of the diabase from Jiangshiqiao in the Taojiang area
TAS classification (a) and SiO2-K2O (b) diagrams of diabase
Chondrite-normalized REE patterns (a) and primitive mantle-normalized trace element spidergrams (b) of the diabase from Jiangshiqiao in the Taojiang area
87Sr/86Sr-143Nd/144Nd (a) and 206Pb/204Pb-207Pb/204Pb (b) diagrams of the diabase from Jiangshiqiao in the Taojiang area