| Trace Elements and Sr, Nd Isotope Geochemistry of the Lajimiao Norite-Gabbro from the North Qinling Belt |
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| 作者姓名： | S.R.Hart |
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| 作者单位： | Department of |
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| 基金项目： | Aproject supported by the National Natural Science Foundation of China (No.49070165) |
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| 摘 要： | The Lajimiao norite-gabbro complex, as a part of the ophiolites on the southern side of the North Qinling belt, consists of gabbro and norite-gabbro. They were derived from different magma series: the gabbro was derived from tholeiitic magma series with higher TiO2, REE abundance and Fe3+/Fe2+ ratio ; norite-gabbro was derived from calc-alkali magma series with lower TiO2, Fe3+/Fe2+ ratio and REE abundance and much lower HREE abundance, which suggests that the source of the norite-gabbro magma was deeper and controlled by eclogite facies. Geochemical characteristics of both plutonic rocks are similar to those of island-arc basalts, such as relatively high contents of Ba, Pb and Sr and relatively low contents of Nb, Zr and N j.The Sr, Nd isotopic characteristics of the Lajimiao norite-gabbro complex are similar to those of ophiolites. Its εNd values are constant, about+2; whereas εst values have wide variation from - 6.4 to +31.2 and positively correlate with Na2O, H2O+ and CO2 contents and the Fe3+/Fe
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Trace Elements and Sr, Nd Isotope Geochemistry of the Lajimiao Norite-Gabbro from the North Qinling Belt |
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| Authors: | Li Shuguang Chen Yizhi |
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| Institution: | Li Shuguang,Chen Yizhi,Department of Earth and Space Sciences,University of Science and Technology ofChin,Hefei,Anhui Zhang Zongqing,Ye Xiaojing,Institute of Geology,Chinese Academy of Geological Sciences,BeijingZhang Guowei,Guo Anlin,Department of Geology,Northwest University,Xi'an,Shaanxiand S.R. HartDepartment of Geology and Geophysics,Woods Hole Oceanographic Institute,WoodsHole,MA USA |
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| Abstract: | |
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| Keywords: | trace element Sr/Nd isotopes norite-gabbro Lajimiao North Qinling |
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