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| 大别造山带北部石竹河片麻岩的锆石U—Pb年龄及其地质意义 | |
| 引用本文： | 谢智,陈江峰,张巽,高天山,戴圣潜,周泰禧,李惠民.大别造山带北部石竹河片麻岩的锆石U—Pb年龄及其地质意义[J].岩石学报,2001,17(1):139-144. |
| 作者姓名： | 谢智 陈江峰 张巽 高天山 戴圣潜 周泰禧 李惠民 |
| 作者单位： | 1. 中国科学技术大学地球和空间科学系化学地球动力学研究实验室, 2. 安徽省地质调查院, 3. 天津地质矿产研究所, |
| 基金项目： | 国家自然科学基金(No.49794042)和前地矿部重大基础项目(No.951102-3-2)资助项目. |
| 摘 要： | 大别造山带北部石竹河二长片麻岩的锆石U-Pb年龄测定结果表明,其原岩形成时代为707±42Ma,在229±18Ma曾受到高温变质作用。这一结果表明印支期变质作用不仅反映在大别造山带南部的变质岩中,而且造山带北部的部分变质岩也保存了这一重要记录。大别造山带北部存在印支期变质年龄的片麻岩、榴辉岩或残留相表明,该地块与造山带南部一样是印支期板块俯冲碰撞中俯冲板块的一部分。华北和扬子板块的碰撞缝合线可能位于大别造山带的北侧。 |
| 关 键 词： | 片麻岩 锆石U－PB定年 超高压变质 印支期 大别造山带 变质作用 板块俯冲 |
| 修稿时间： | 2000年9月25日 |
Zircon U-Pb dating of gneiss from Shizhuhe in North Dabie and its geologic implications. |
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| XIE Zhi,CHEN JianFeng,ZHANG Xun,GAO TianShan,DAI ShengQian,ZHOU TaiXi and LI HuiMin.. Laboratory for Chemical Geodynamics.Zircon U-Pb dating of gneiss from Shizhuhe in North Dabie and its geologic implications.[J].Acta Petrologica Sinica,2001,17(1):139-144. | |
| Authors: | XIE Zhi CHEN JianFeng ZHANG Xun GAO TianShan DAI ShengQian ZHOU TaiXi and LI HuiMin Laboratory for Chemical Geodynamics |
| Institution: | XIE Zhi,CHEN JianFeng,ZHANG Xun,GAO TianShan,DAI ShengQian,ZHOU TaiXi and LI HuiMin.. Laboratory for Chemical Geodynamics,Department of Earth and Space Sciences,University of Science and Technology of Chin,Hefei,Chin,. Geological S |
| Abstract: | The zircon U-Pb age of a monzogneiss from Shizhuhe in North Dabie was dated. The results indicate that the protolith of the gneiss was formed at 707±42Ma, and the rock underwent metamorphism at 229±18Ma. The ages suggest that the Indosinian metamorphism of the Dabie orogen affected not only the metamorphic rocks in South Dabie, and also some rocks in North Dabie. The gneiss with Indosinian metamorphic age, the occurrence of eclogites and eclogite-facies relics in North Dabie suggest that North Dabie was a part of the subducted block as the South Dabie. The suture line between North China Block and Yangtze Block may be in the north of Dabie orogen. |
| Keywords: | Gneiss Zircon U-Pb dating Ultra-high pressure metamorphism Indosinian Dabie orogenic belt |
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