| 湖南黔阳镁铁-超镁铁质岩Sm-Nd年龄测定 |
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| 引用本文： | 周新华,程海,陈海泓,Martin Meier.湖南黔阳镁铁-超镁铁质岩Sm-Nd年龄测定[J].地质科学,1992,0(4):391-393. |
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| 作者姓名： | 周新华 程海 陈海泓 Martin Meier |
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| 作者单位： | 1. 中国科学院地质研究所, 北京 100029;2. Inst. Krist. Petrol. ETH, Zurich CH8092 |
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| 摘 要： | 本文首次报导湘西黔阳一怀化地区隘口岩体全岩Sm-Nd等时年龄为890±104Ma,钕同位素初始比值为εNd(T)=+1.63±1.90。样品的岩矿地球化学体系表明,岩体源自略亏损的地幔原区,并非为典型的反映大洋成因的蛇绿岩套,而更可能是晚元古宙江南碰撞造山带中段的一个组成部分,如弧后盆地开张初期产物。这一推论对研究华南地区构造演化史有重要指示意义。
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| 关 键 词： | 黔阳地区 Sm-Nd年龄 晚元古宙碰撞造山带 |
| 收稿时间： | 1992-06-01 |
| 修稿时间： | 1992-06-01; |
Sm-Nd DATING OF MAFIC-ULTRAMAFIC ROCKS FROM QIYANG AREA, WESTERN HUNAN |
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| Zhou Xinhua Cheng Hai,Chen Haihong.Sm-Nd DATING OF MAFIC-ULTRAMAFIC ROCKS FROM QIYANG AREA, WESTERN HUNAN[J].Chinese Journal of Geology,1992,0(4):391-393. |
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| Authors: | Zhou Xinhua Cheng Hai Chen Haihong |
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| Institution: | 1. Institute of Geology, Chinese Academy of Sciences, Beijing;2. Krist. Petrol. Inst. ETH, Zurich |
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| Abstract: | Four whole rock samples from the mafic-ultramafic belt, Qiyang area, western Hunan have been collected for Sm-Nd dating, which yields a well-defined isochron age of 890+104 Ma, ΣNd(T)=+1.63±1.90. The petrological and geochemical evidences suggest that the rocks were derived from a slightly depleted mantle source. It is unlikely they represent the members of a typical ophiolite suite. However, it may be explained as the consequence of opening of a backarc basin in the Late Proterozoic orogenic belt. This implication provides a new constraint on the tectonic evolution of South China. |
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| Keywords: | Qiyang area Sm-Nd age Late Proterozic collision belt |
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