| 粤北牛岱辉绿岩脉的地球化学特征及其成因研究 |
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| 引用本文： | 曹豪杰,黄乐真,沈渭洲,凌洪飞,黄国龙,邓平,朱捌.粤北牛岱辉绿岩脉的地球化学特征及其成因研究[J].东华理工大学学报（自然科学版）,2011(4):323-331. |
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| 作者姓名： | 曹豪杰 黄乐真 沈渭洲 凌洪飞 黄国龙 邓平 朱捌 |
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| 作者单位： | 核工业290研究所;南京大学地球科学与工程学院;中国地质科学院地质研究所 |
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| 基金项目： | 内生金属矿床成矿机制研究国家重点实验室研究项目(2008-I-04);教育部科学研究重大项目(306007) |
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| 摘 要： | 牛岱辉绿岩脉位于粤北诸广岩体南部.牛岱辉绿岩具有低SiO2 (45.04％ ～48.64％)、高TiO2( 2.02％～ 3.23％)和TFeO含量(17.00％～ 19.80％)、富集K,Rb,Ba等大离子亲石元素和La,Nd,Eu,Tb等稀土元素、Nb-Ta亏损轻微、稀土总量较高(112.1×10-6 ～132.7...
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| 关 键 词： | 元素地球化学 Nd-Sr-Pb同位素 洋岛玄武岩 牛岱辉绿岩 粤北 |
Geochemical Characteristics and Genesis of Niudai Diabase Dykes in Northern Guangdong Province |
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| CAO Hao-jie,HUANG Le-zhen,SHEN Wei-zhou,LING Hong-fei,HUANG Guo-long,DENG Ping,ZHU Ba.Geochemical Characteristics and Genesis of Niudai Diabase Dykes in Northern Guangdong Province[J].Journal of East China Institute of Technology(Natural Science Edition),2011(4):323-331. |
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| Authors: | CAO Hao-jie HUANG Le-zhen SHEN Wei-zhou LING Hong-fei HUANG Guo-long DENG Ping ZHU Ba |
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| Institution: | 1 (1.Research Institute No.290,CNNC,Shaoguan,GD 512026,China;2.School of Earth Sciences and Engineering,Nanjing University,Nanjing,JS 210093,China;3.Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China) |
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| Abstract: | The Niudai diabase dykes,located in the south of Zhuguang pluton of North Guangdong Province,are characterized with low SiO2(45.04%～48.64%),high TiO2 (2.02%～3.23%) and TFeO (17.00%～19.80%),enrichment in LILE (Rb,Ba) and LREE,relatively high ΣREE(112.1×10-6～132.7×10-6),slightly depletion in Nb and Ta,without negative Eu anomaly.All informations are similar to the basalt from asthenospheric mantle sources.Elements’ ratios of incompatible elements,such as Zr/Ba,La/Nb,La/Ta,Ti/Y,Ba/Nb,Th/Nb and Th/La of Niudai diabase are close to the ratios of OIB.The tectonic discrimination diagrams show that the diabases all fall into the range of OIB.The Niudai diabases have Pb isotope (206Pb/204Pb=18.153～18.594,207Pb/204Pb=15.713～15.730,208Pb/204Pb=39.184～39.206) and its εNd(t) ranges from 3.1 to 4.3,close to the scope of OIB.The geochemical characteristics indicate that the origin of Niudai Diabase had both ends of members of mixed characteristics of asthenospher mantle and lithosphere mantle,and the hybrid were related to the melts of overlying lithosphere mantle as asthenospher mantle upwelling.The Niudai diabases are formed while the fast invaded of magma in the tectonic environment that lithospher thinning leaded by asthenosphere mantle upwelling. |
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| Keywords: | elemental geochemistry Nd-Sr-Pb isotopes ocean island basalt Niudai diabase dykes northern Guangdong province |
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