Geochemical Characteristics and Genesis of the Luxi-Xianrenzhang Diabase Dikes in Xiazhuang Uranium Orefield, Northern Guangdong Province |
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| Authors: | LING Hongfei SHEN Weizhou DENG Ping JIANG Shaoyong JIANG Yaohui YE Haimin PU Wei and TAN Zhengzhong State Key Laboratory of Mineral Deposit Research and |
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| Institution: | LING Hongfei,SHEN Weizhou,DENG Ping,JIANG Shaoyong,JIANG Yaohui,YE Haimin,PU Wei and TAN Zhengzhong State Key Laboratory of Mineral Deposit Research and Department of Earth Sciences,Nanjing University,Nanjing,Jiangsu,E-mail: hfling@icpms.nju.edu.cn Research Institute No.,CNNC,Shaoguan,Guangdong |
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| Abstract: | Abstract The Luxi‐Xianrenzhang diabase dikes were emplaced into the eastern part of the Guidong composite granitoids in northern Guangdong Province at the end of the Early Cretaceous. They show tholeiitic features, enrichment in large ion lithophile elements, slight enrichment in light rare earth elements, depletion in Zr and Hf, and basically no depletion in Nb and Ta and no Eu anomaly. They are similar to intraplate basalt in terms of trace element characteristics. They have high ? Nd(t) values (3.6‐4.9), initial 87Sr/86 Sr ratios (0.70530‐0.70641) and δ18 O values and Dupal anomaly of Pb isotope compositions. Their Sr‐Nd, Pb‐Sr, Pb‐Nd and Pb‐Pb isotopes plot between DMM and EMII, with Pb similar to EMII, Nd relatively close to DMM and Sr in between. This profile suggests that the diabase dikes studied were derived from partial melting of a mantle source that had been subjected to metasomatism by fluids originated from a subduction zone under a tectonic environment of crustal extension and lithosphere thinning in the late Yanshanian. |
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| Keywords: | geochemistry main and trace elements Nd-Sr-Pb-O isotopes diabase dikes Guangdong |
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