| 从Pb同位素组成看东秦岭官坡超高压变质岩片的走势 |
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| 引用本文： | 张利,钟增球,张宏飞,王林森.从Pb同位素组成看东秦岭官坡超高压变质岩片的走势[J].矿物岩石,2005,25(2):60-63. |
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| 作者姓名： | 张利 钟增球 张宏飞 王林森 |
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| 作者单位： | 中国地质大学(武汉)地球科学学院地质过程与矿产资源国家重点实验室,湖北,武汉,430074;中国地质大学(武汉)地球科学学院地质过程与矿产资源国家重点实验室,湖北,武汉,430074;中国地质大学(武汉)地球科学学院地质过程与矿产资源国家重点实验室,湖北,武汉,430074;中国地质大学(武汉)地球科学学院地质过程与矿产资源国家重点实验室,湖北,武汉,430074 |
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| 基金项目： | 国家自然科学基金项目(No.:40372094)，国家重大基础研究发展规划项目(G1999075506)，中国地质大学(武汉)优秀青年教师资助计划项目(CUGQNL0327)。 |
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| 摘 要： | 通过研究表明，东秦岭官坡超高压变质岩片具有较高的放射性成因铅同位素组成：^206Pb／^204Pb=18．089～18．772，^207Pb／^204Pb=15．571～15．631，^208Pb／^204Pb=38．299～38．829。其铅同位素组成与秦岭岩群及二郎岩坪群一致，而与大别超高压变质带有明显的区别。结合构造分析可以判断，东秦岭超高压变质带与大别超高压变质带是两个不同的构造带，中央造山带内可能至少发育有两条超高压变质带。
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| 关 键 词： | Pb同位素 东秦岭 官坡 超高压变质带 大别 |
| 文章编号： | 1001-6872(2005)02-0060-04 |
| 修稿时间： | 2004年12月23 |
EVALUATION ON THE GUANPO UHP METAMORPHIC BELT IN THE EASTERN QINLING IN REFERENCE TO THE Pb ISOTOPIC COMPOSITIONS |
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| ZHANG Li,ZHONG Zeng-qiu,ZHANG Hong-fei,WANG Lin-sen.EVALUATION ON THE GUANPO UHP METAMORPHIC BELT IN THE EASTERN QINLING IN REFERENCE TO THE Pb ISOTOPIC COMPOSITIONS[J].Journal of Mineralogy and Petrology,2005,25(2):60-63. |
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| Authors: | ZHANG Li ZHONG Zeng-qiu ZHANG Hong-fei WANG Lin-sen |
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| Abstract: | The spatial relationship between the East Qinling and Dabie-Sulu UHP metamorphic belts has been a controversy. Pb isotopic study indicated that the UHP metamorphic rocks from Guanpo UHP fragment in East Qinling were characterized by highe Pb isotopic compositions with ()~(206)Pb/()~(204)Pb=18.089~18.772,()~(207)Pb/()~(204)Pb=15.571~15.631,and ()~(208)Pb/()~(204)Pb=38.299~(38.829).The Pb isotopic compositions of the UHP fragment in East Qinling are different from those in the Dabie UHP metamorphic belt,but consistent with the rocks from the Qinling rock group and Erlangping rock group. On the basis of the Pb isotopic compositionsand the structural analysis,the East Qinling UHP metamorphic belt was different from the Dabie UHP metamorphic belt and they did not belong to a single giant belt. Therefore,it is likely that there are at least two UHP metamorphic belts of different age within the Central Orogenic Belt. |
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| Keywords: | Pb isotope east Qinling Guanpo UHP metamorphic belt Dabie |
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