| 扬子陆核古元古代变质事件——来自孔兹岩系变质锆石U-Pb同位素年龄的证据 |
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| 引用本文： | 邱啸飞,赵小明,杨红梅,魏运许,吴年文,卢山松,江拓,彭练红.扬子陆核古元古代变质事件——来自孔兹岩系变质锆石U-Pb同位素年龄的证据[J].地质通报,2017,36(5):706-714. |
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| 作者姓名： | 邱啸飞 赵小明 杨红梅 魏运许 吴年文 卢山松 江拓 彭练红 |
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| 作者单位： | 1. 中国地质调查局武汉地质调查中心同位素地球化学研究室, 湖北 武汉 430205;2. 中国地质调查局花岗岩成岩成矿地质研究中心, 湖北 武汉 430205 |
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| 基金项目： | 国家自然科学基金项目《扬子克拉通神农架地区新元古代基性岩墙时代、成因和构造意义的地球化学研究》（批准号：41303026）、中国地质调查局项目《武当-桐柏-大别成矿带武当—随枣地区岩浆岩同位素年代学与地球化学调查》（编号：DD20160030）、《中南地区基础地质综合调查与片区总结》（编号：DD20160351）和中国地质调查局百名青年地质英才培养计划 |
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| 摘 要： | 崆岭杂岩除太古宙结晶基底外,还出露一套以含石墨和富铝矿物为特征的孔兹岩系。相对于结晶基底,目前对于该套表壳岩系的同位素年代学研究有限。对该套孔兹岩系中代表性岩石类型榴线英岩开展了变质锆石U-Pb同位素年龄测定。研究结果表明,榴线英岩变质年龄为1964±12Ma。结合前人在相近地层岩石组合中报道的锆石U-Pb年龄数据,推测崆岭杂岩孔兹岩系原岩可能沉积于2.1~2.0Ga。扬子陆核的古元古代变质-岩浆作用可能与全球广泛存在的同时期(2.1~1.8Ga)碰撞造山事件有关,暗示其很可能是Columbia超大陆的重要组成部分。
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| 关 键 词： | 扬子克拉通 崆岭杂岩 孔兹岩系 锆石U-Pb年代学 构造演化 |
| 收稿时间： | 2016/1/18 0:00:00 |
| 修稿时间： | 2016/6/28 0:00:00 |
Paleoproterozoic metamorphic event in the nucleus of the Yangtze craton:Evidence from U-Pb geochronology of the metamorphic zircons from the khondalite |
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| QIU Xiaofei,ZHAO Xiaoming,YANG Hongmei,WEI Yunxu,WU Nianwen,LU Shansong,JANG Tuo and PENG Lianhong.Paleoproterozoic metamorphic event in the nucleus of the Yangtze craton:Evidence from U-Pb geochronology of the metamorphic zircons from the khondalite[J].Geologcal Bulletin OF China,2017,36(5):706-714. |
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| Authors: | QIU Xiaofei ZHAO Xiaoming YANG Hongmei WEI Yunxu WU Nianwen LU Shansong JANG Tuo and PENG Lianhong |
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| Institution: | 1. Isotope Geochemistry Laboratory, Wuhan Center of Geological Survey, CGS, Wuhan 430205, Hubei, China;2. Research Center for Petrogenesis and Mineralization of Granitoid Rocks, CGS, Wuhan 430205, Hubei, China |
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| Abstract: | Apart from the Archean metamorphic crystal basement,a series of khondalite-bearing graphites and Al-rich minerals are exposed in the Kongling Complex.However,relative to the study of metamorphic crystal basement,geochronological studies of the supracrustal rocks are still very insufficient.In this study,the LA-ICP-MS zircon U-Pb study was carried out for the typical samples of garnet-sillimanite quartzite in the khondalite series.The result shows that the garnet-sillimanite-quartzite was metamorphosed at 1964±12Ma.Combined with the documented zircon U-Pb geochronologic data,the authors hold that the khondalite-series in the Kongling Complex was deposited at 2.1~2.0Ga.The Paleoproterozoic metamorphism and magmatism recognized in the interior of the Yangtze craton are consistent with the worldwide coeval collision-related orogenic event during 2.1~1.8Ga,indicating that this event may have been an important component in the Columbia supercontinent. |
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| Keywords: | Yangtze craton Kongling Complex khondalites zircon U-Pb geochronology tectonic evolution |
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