地质通报2017，Vol.36Issue(5)：706-714,9.
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
Paleoproterozoic metamorphic event in the nucleus of the Yangtze craton:Evidence from U-Pb geochronology of the metamorphic zircons from the khondalite
摘要
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.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Key words
Yangtze craton/Kongling Complex/khondalites/zircon U-Pb geochronology/tectonic evolution分类
天文与地球科学引用本文复制引用
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):706-714,9.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 （批准号:41303026）
