| 湘南中生代橄榄岩包体的Nd同位素组成及成因意义 |
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| 引用本文： | 郭锋,范蔚茗,林舸,林源贤.湘南中生代橄榄岩包体的Nd同位素组成及成因意义[J].矿物学报,1999,19(2):206-209. |
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| 作者姓名： | 郭锋 范蔚茗 林舸 林源贤 |
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| 作者单位： | 1. 中国科学院长沙大地构造研究所,长沙,410013
2. 国土资源部天津地质矿产研究所,天津,310070 |
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| 基金项目： | 国家自然科学基金!492520001，中国科学院院长基金 |
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| 摘 要： | 湘南地区四组中生代橄榄岩包体单斜辉石（ｃｐｘ）Ｎｄ同位素分析结果表明橄榄岩包体具极为亏损的Ｎｄ同位素组成。其中前三组样品的ｔＤＭ年龄分别为２．１９，１．４４和１．８３Ｇａ，另一样品９３Ｔｉ－１８则受到后期改造且发生了ＬＲＥＥ富集作用。
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| 关 键 词： | 橄榄岩包体 Nd同位素组成 岩石成因 中生代 湘南宁远 |
NEODYMIUM ISOTOPIC COMPOSITION AND PETROGENESIS OF PERIDOTITE XENOLITHS IN NINGYUAN REGION, SOUTH HUNAN |
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| Guo Feng,Fan Weiming,Lin Ge,LinYuanxian.NEODYMIUM ISOTOPIC COMPOSITION AND PETROGENESIS OF PERIDOTITE XENOLITHS IN NINGYUAN REGION, SOUTH HUNAN[J].Acta Mineralogica Sinica,1999,19(2):206-209. |
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| Authors: | Guo Feng Fan Weiming Lin Ge LinYuanxian |
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| Abstract: | The Nd isotopic compositions of four clinopyroxenes separated from spinel lherzolitexenoliths in Mesozoic basalts from Ningyuan, South Hunan, are reported. It is indicated that thelherzolite xenoliths are fairly depleted in Nd isotopes with high 143 Nd/144 Nd ratios (0. 513 4010. 513 667). Three xenoliths have depleted mantle model ages (tDM) of 2. 19 Ga, 1. 44 Ga and1. 83Ga, respectively. Another sample 93Ti-18, which is less depleted in Nd isotopic composition.had undergone late alteration and LREE-enriching processes. Combining with the dala from petrochemlstry and mineral chemlstry of the xenoliths, the authors believe that the lherzolite xenolithswere derived from the early crystal fractionation of mantle-derived magmas during the ancientcrustal growth from the Early to Mlddle Proterizoic. |
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| Keywords: | peridotite xenolith Nd isotopic composition petrogenesis Mesozoic South Hunan |
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