| 桂北四堡群火山岩锆石SHRIMP年龄及其地层学意义 |
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| 引用本文： | 李利阳,游国庆,张传恒,贾龙龙,韩瑶,张恒,刘博,冯欣,李新发,张金龙.桂北四堡群火山岩锆石SHRIMP年龄及其地层学意义[J].中国地质,2016(6):1992-1998. |
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| 作者姓名： | 李利阳 游国庆 张传恒 贾龙龙 韩瑶 张恒 刘博 冯欣 李新发 张金龙 |
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| 作者单位： | 中国地质大学(北京)地球科学与资源学院, 北京 100083;武警黄金第四支队, 辽宁 辽阳 111000,中国地质科学院地质研究所, 北京 100037,中国地质大学(北京)地球科学与资源学院, 北京 100083,中国地质大学(北京)地球科学与资源学院, 北京 100083,中国地质大学(北京)地球科学与资源学院, 北京 100083,中国地质科学院地质研究所, 北京 100037,武警黄金第四支队, 辽宁 辽阳 111000,武警黄金第四支队, 辽宁 辽阳 111000,武警黄金第四支队, 辽宁 辽阳 111000,武警黄金第四支队, 辽宁 辽阳 111000 |
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| 基金项目： | 中国地质调查局项目“中国构造区划及其在全国地质志中的应用”（1212011120115）资助。 |
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| 摘 要： | 四堡群为一套出露于桂北黔东南地区、变形强烈的浅变质、陆源碎屑岩火山岩、系,厚度大于5000 m,其下未见底,上被丹洲群(下江群相当地层)所覆盖。桂北四堡群自下而上划分为九小组、文通组和鱼西组3组。样品A20140731-3采自于文通组,岩性为灰绿色熔结火山岩,首次分选出600余粒岩浆型锆石,完成SHRIMP U-Pb定年测点15个,获得加权平均年龄(860±13)Ma。这表明四堡群主体属于新元古界,进而分析、讨论了江南造山带主要地层对比关系。
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| 关 键 词： | 四堡群 锆石SHRIMP年龄 新元古界 江南造山带 |
| 收稿时间： | 2015/12/13 0:00:00 |
| 修稿时间： | 2016/2/24 0:00:00 |
SHRIMP age of the lava from the Sibao Group in Guilin and its chronostratigraphic significance |
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| LI Li-yang,YOU Guo-qing,ZHANG Chuan-heng,JIA Long-long,HAN Yao,ZHANG Heng,LIU Bo,FENG Xin,LI Xin-fa and ZHANG Jin-long.SHRIMP age of the lava from the Sibao Group in Guilin and its chronostratigraphic significance[J].Chinese Geology,2016(6):1992-1998. |
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| Authors: | LI Li-yang YOU Guo-qing ZHANG Chuan-heng JIA Long-long HAN Yao ZHANG Heng LIU Bo FENG Xin LI Xin-fa and ZHANG Jin-long |
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| Institution: | School of Earth Sciences and Resources, China University Of Geosciences(Beijing), Beijing 100083, China;No. 4 Gold Geological Party of CAPF, Liaoyang 111000, Liaoning, China,Institute of Geology Chinese Academy of Geological Sciences, Beijing 100037, China,School of Earth Sciences and Resources, China University Of Geosciences(Beijing), Beijing 100083, China,School of Earth Sciences and Resources, China University Of Geosciences(Beijing), Beijing 100083, China,School of Earth Sciences and Resources, China University Of Geosciences(Beijing), Beijing 100083, China,Institute of Geology Chinese Academy of Geological Sciences, Beijing 100037, China,No. 4 Gold Geological Party of CAPF, Liaoyang 111000, Liaoning, China,No. 4 Gold Geological Party of CAPF, Liaoyang 111000, Liaoning, China,No. 4 Gold Geological Party of CAPF, Liaoyang 111000, Liaoning, China and No. 4 Gold Geological Party of CAPF, Liaoyang 111000, Liaoning, China |
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| Abstract: | The Sibao Group, outcropped in the north part of Guangxi and southeast part of Guizhou, is composed of over 5000 m thick succession of strongly-deformed, low-grade metamorphic volcanic rocks and terrigenous clastic rock, overlain unconformity by the Danzhou Group (Xiajiang Group). It is divided into three Formations:Jiuxiao Formation, Wentong Formation and Yuxi Formation. Sample A20140731-3 is lava, collected from the upper part of the Wentong Formation, and over 600 grains of zircon were sorted out from it. Fifteen of the zircons were analyzed with SHRIMP, and a weighed-mean U-Pb age of(860±13) Ma was obtained, which indicates that the volcanic rocks of the Sibao Group belong to Neoproterozoic. Based on this new zircon SHRIMP U-Pb age combined with the other high-quality ages obtained recently in the Jiangnan Orogen, the authors investigated the stratigraphic correlation between Sibao Group and the other main strata, such as Lengjiaxi Group, Shuangqiaoshan Group, and Fanjingshan Group. |
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| Keywords: | Sibao Group zircon SHRIMP age Neo-Proterozoic Jiangnan Orogen |
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