| 北秦岭庙湾组黑色岩系稀土元素地球化学特征及成因意义 |
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| 关键词:Miaowan Formation black rock series REE geochemistry dry and anoxic environment Northern Qinling |
| 基金项目:西北有色地勘局地勘院“陕西南部黑色岩系金属矿床成矿规律及找矿预测研究”(编号: 地勘[2006])和中国地质调查局“昆仑-阿尔金成矿带地质矿产调查综合研究”(编号: 1212010913015) |
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| REE Geochemical Characteristics of the Miaowan Formation Black Rock Series in North Qinling Mountain and Their Genetic Significance |
| The abundances of rare earth elements and some trace elements such as V, Ni, Cr, U and Th of the black rock series from the Miaowan Formation in North Qinling Mountain were measured by using the ICP-MS method. The results show that the black rock series of the Miaowan Formation is usually of the LREE-enriched type, that the samples are characterized by slightly negative or positive Ce anomalies (δCe=0.65~1.02) and distinct positive Eu anomalies (with δEu mostly higher than 1.54), and that the ratios of U/Th display a wide variation range from 0.38 to 4.07, the ratios of w (V) /w (V +Ni)(= 0.38~0.93) are normal, and the ratios of w (Ce)/w (La) (=1.27~2.17) are relatively high. A study of the parameters of REE and trace elements in comparison with the available data and an analysis of the La/Yb-Ce/La and La/Yb- REE diagrams reveal that the black rock series was formed in a dry, anoxic and shallow sea environment belonging to an active continental margin, with the participation of some hydrothermal fluids. |
| WANG Li-she,HOU Jun-fu,ZHANG Fu-xin,QIN Yan,CAO Hong-xia,QI Ya-lin,YANG Peng-fei,JIN Suan-lian,FANG Bo,ZHOU Yan.2010.REE Geochemical Characteristics of the Miaowan Formation Black Rock Series in North Qinling Mountain and Their Genetic Significance[J].Acta Geoscientica Sinica,31(1):73-82. |
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