| 江西广丰、玉山盆地橄榄玄粗岩的SHRIMP锆石U-Pb定年和Sr-Nd-Pb-O元素同位素特征 |
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| 引用本文： | 巫建华,项媛馨,钟志菲.江西广丰、玉山盆地橄榄玄粗岩的SHRIMP锆石U-Pb定年和Sr-Nd-Pb-O元素同位素特征[J].岩石矿物学杂志,2014,33(4):645-656. |
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| 作者姓名： | 巫建华 项媛馨 钟志菲 |
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| 作者单位： | 东华理工大学核资源与环境国家重点实验室培育基地;东华理工大学地球科学学院;中国科学院 |
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| 基金项目： | 国家自然科学基金项目(41372071);中国核工业集团总公司项目(中核地计[2008]74号) |
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| 摘 要： | 华夏古板块与扬子古板块结合带内的广丰、玉山红色碎屑沉积盆地均有橄榄玄粗岩产出,SHRIMP锆石UPb年代学研究表明,橄榄玄粗岩锆石U-Pb年龄为93±1 Ma,属晚白垩世早期的产物。广丰盆地橄榄玄粗岩(~(87)Sr/~(86)Sr)_i值为0.706 191~0.706 352,εNd(t)值为0.27~0.55,(~(206)Pb/~(204)Pb)_i值为18.045~18.080,(~(207)Pb/~(204)Pb)_i值为15.503~15.543,(~(208)Pb/~(204)Pb)_i值为38.240~38.256;玉山盆地橄榄玄粗岩(~(87)Sr/~(86)Sr)_i值为0.705 856~0.706 024,εNd(t)值为1.74~1.93,(~(206)Pb/~(204)Pb)_i值为17.956~18.063,(~(207)Pb/~(204)Pb)_i值为15.456~15.498,(~(208)Pb/~(204)Pb)_i值为38.195~38.232。在(~(87)Sr/~(86)Sr)_i-(~(206)Pb/~(204)Pb)_i、(~(143)Nd/~(144)Nd)_i-(~(206)Pb/~(204)Pb)_i和(~(143)Nd/~(144)Nd)_i-(~(87)Sr/~(86)Sr)i图解中,广丰、玉山盆地橄榄玄粗岩均位于亏损地幔(DMM)和EMⅡ型富集地幔之间,而且(~(87)Sr/~(86)Sr)_i和(~(206)Pb/~(204)Pb)_i呈正相关,(~(143)Nd/~(144)Nd)_i和(~(206)Pb/~(204)Pb)_i呈负相关,指示其源区中可能均有DMM和EMⅡ型地幔的贡献;玉山盆地橄榄玄粗岩更偏向DMM端员,指示其DMM端员所占的比例更高。广丰、玉山盆地橄榄玄粗岩具有EMⅡ型地幔的贡献,说明华夏古板块与扬子古板块结合带的岩石圈地幔与华夏古板块的岩石圈地幔属相同类型,为华夏古板块俯冲于扬子古板块之下提供了新的证据。
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| 关 键 词： | 橄榄玄粗岩 SHRIMP锆石U-Pb年龄 Sr-Nd-Pb-O同位素 广丰、玉山盆地 |
| 收稿时间： | 2013/4/26 0:00:00 |
| 修稿时间： | 2014/5/23 0:00:00 |
SHRIMP zircon U-Pb dating and Sr-Nd-Pb-O isotope characteristics of shoshonite from Guangfeng and Yushan basins in Jiangxi Province |
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| WU Jian-hu,XIANG Yuan-Xin and ZHONG Zhi-fei.SHRIMP zircon U-Pb dating and Sr-Nd-Pb-O isotope characteristics of shoshonite from Guangfeng and Yushan basins in Jiangxi Province[J].Acta Petrologica Et Mineralogica,2014,33(4):645-656. |
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| Authors: | WU Jian-hu XIANG Yuan-Xin and ZHONG Zhi-fei |
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| Institution: | State Key Laboratory Breeding Base of Nuclear Resources and Environment, East China Institute of Technology, Nanchang 330013, China;College of Earth Science, East China Institute of Technology, Nanchang 330013, China;State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;College of Earth Science, East China Institute of Technology, Nanchang 330013, China |
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| Abstract: | |
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| Keywords: | shoshonite SHRIMP zircon U-Pb dating Sr-Nd-Pb-O isotopes Guangfeng and Yushan basins |
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