| 柴北缘超高压变质带变质泥质岩碎屑锆石年代学研究及其地质意义 |
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| 引用本文： | 高展,张贵宾.柴北缘超高压变质带变质泥质岩碎屑锆石年代学研究及其地质意义[J].岩石学报,2017,33(6):1775-1788. |
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| 作者姓名： | 高展 张贵宾 |
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| 作者单位： | 北京大学地球与空间科学学院, 造山带与地壳演化教育部重点实验室, 北京 100871,北京大学地球与空间科学学院, 造山带与地壳演化教育部重点实验室, 北京 100871 |
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| 基金项目： | 本文受国家"973"项目（2015CB856105）和国家自然科学基金项目（41622202、41330210、41272068）联合资助. |
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| 摘 要： | 柴北缘超高压变质带作为中国西部深俯冲的一个研究热点,对其变质泥质岩的碎屑锆石年龄研究对了解此区内深俯冲大陆的前寒武纪演化历史,及与华北克拉通及华南克拉通的亲缘性讨论具有重要意义。本文选取柴北缘超高压变质带中绿梁山和都兰的变质泥质岩,筛选锆石利用LA-ICP-MS进行定年并讨论其地质意义。实验结果表明碎屑锆石年龄分为三个组别集中,分别是1100Ma、1000~800Ma和800~500Ma,并分别代表了古老的结晶基底、与Rodinia超大陆相关的碰撞和裂解事件以及古祁连洋的演化。板块亲缘性分析表明柴达木-祁连地区可能与扬子克拉通西缘具有亲缘性,可能作为扬子克拉通西缘的延伸而与扬子克拉通相连。通过结合碎屑锆石数据及板块亲缘性分析并对比现今西太平洋边缘的演化模式,本文提出了一个在早古生代北祁连为主动大陆边缘,柴北缘为被动大陆边缘;在祁连地体北侧的古祁连洋闭合后柴北缘转变为主动大陆边缘的构造演化模式。
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| 关 键 词： | 柴北缘超高压变质带 碎屑锆石 Rodinia超大陆 前寒武纪构造历史 |
| 收稿时间： | 2016/3/1 0:00:00 |
| 修稿时间： | 2017/1/1 0:00:00 |
Geochronology of detrital zircons from metapelite of the North Qaidam UHPM belt and its geological implications |
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| GAO Zhan and ZHANG GuiBin.Geochronology of detrital zircons from metapelite of the North Qaidam UHPM belt and its geological implications[J].Acta Petrologica Sinica,2017,33(6):1775-1788. |
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| Authors: | GAO Zhan and ZHANG GuiBin |
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| Institution: | MOE Key Laboratory of the Orogenic Belt and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing 100871, China and MOE Key Laboratory of the Orogenic Belt and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing 100871, China |
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| Abstract: | The North Qaidam Ultrahigh-pressure Metamorphic (UHPM) belt is of great significance in revealing ancient tectonic activities to study the detrital zircon ages in metapelite. In this paper, we conduct LA-ICP-MS zircon U-Pb dating for metapelite from Luliangshan and Dulan in the North Qaidam UHPM belt. Detrital zircon ages show three groups of >1100Ma, 1100~800Ma and 800~500Ma, representing the ancient continent nucleus, the collision and break-up of the supercontinent Rodinia and the evolution history of the Paleo-Qilian ocean. These similar data with the western Yangtze craton suggest that the Qaidam-Qilian might have been the western part of Yangtze craton. Compared with the present tectonic evolution of the Western Pacific Ocean, we conclude a new tectonic model: the North Qilian was an active continental margin and the North Qaidam was a passive continental margin in the Early Paleozoic; then, the North Qaidam turned to active continental margin after the ancient Qilian ocean closed on the north side of the Qilian terrane. |
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| Keywords: | North Qaidam UHPM belt Detrital zircon Rodinia super-continent Precambrian tectonic history |
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