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| 西准噶尔包古图地区地层火山岩锆石LA-ICP-MS U-Pb年代学研究 | |
| 引用本文： | 郭丽爽,刘玉琳,王政华,宋达,许发军,苏犁.西准噶尔包古图地区地层火山岩锆石LA-ICP-MS U-Pb年代学研究[J].岩石学报,2010,26(2):471-477. |
| 作者姓名： | 郭丽爽 刘玉琳 王政华 宋达 许发军 苏犁 |
| 作者单位： | 1. 造山带与地壳演化教育部重点实验室,北京大学地球与空间学院,北京,100871;兰州大学西部环境教育部重点实验室,兰州,730000 2. 造山带与地壳演化教育部重点实验室,北京大学地球与空间学院,北京,100871 3. 新疆有色地质勘查局地质研究所,乌鲁木齐,830000 4. 中国地质大学,北京,地学实验中心,北京,100083 |
| 基金项目： | 国家重点基础研究规划项目(2007CB411305)和兰州大学2008年接受国内博士生访学项目联合资助 |
| 摘 要： | 包古图地区位于西准噶尔东南部,区内出露地层主要为石炭系太勒古拉组、包古图组和希贝库拉斯组,为一套巨厚的半深海相-大陆坡相火山-火山碎屑沉积建造。这套地层的时代归属和地层层序长期以来一直存在争议。本文报导了包古图地区实测地层剖面,并从太勒古拉组玄武岩和包古图组及希贝库拉斯组凝灰岩中分别选出锆石,进行了LA-ICP-MS U-Pb年代学研究,获得206Pb/238U加权平均年龄分别为357.5±5.4Ma、332.1±3.0Ma和336.3±2.5Ma。由此确定这套地层属于早石炭世的杜内阶到维宪阶,由下到上依次为太勒古拉组、包古图组和希贝库拉斯组。 |
| 关 键 词： | 西准噶尔 包古图 火山岩 锆石 U-Pb年代学 |
| 收稿时间： | 5/9/2009 12:00:00 AM |
| 修稿时间： | 7/3/2009 12:00:00 AM |
The zircon U-Pb LA-ICP-MS geochronology of volcanic rocks in Baogutu areas, western Junggar |
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| Guo LS,Liu YL,Wang ZH,Song D,Xu FJ and Su L.The zircon U-Pb LA-ICP-MS geochronology of volcanic rocks in Baogutu areas, western Junggar[J].Acta Petrologica Sinica,2010,26(2):471-477. | |
| Authors: | Guo LS Liu YL Wang ZH Song D Xu FJ and Su L |
| Institution: | The Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China;The Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China;The Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China;The Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China;Institute of Geology, Xinjiang Nonferrous Geoexploration Bureau, Urumqi 830000, China;The Geological Lab Center, China University of Geosciences, Beijing 100083, China |
| Abstract: | There is a great thickness of bathyal- and slope-facies volcanic-volcaniclastic sedimentary sequence at Baogutu area in southeast of western Junggar, which are named as Tailegula Formation, Baogutu Formation and Xibeikulas Formation, respectively. There have been controversies about the geological ages and stratigraphic subdivision about these strata for a long time. So we surveyed the stratum section at Baogutu area and separated zircons from basalt of the Tailegula Formation and tuff of Baogutu Formation and Xibeikulas Formation. LA-ICP-MS U-Pb dating on these zircon grains gives the 206Pb/238U weighted mean ages of 357.5±5.4Ma, 332.1±3.0Ma and 336.3±2.5Ma, respectively, indicating that the strata sequence from bottom to top should be Tailegula Formation, Baogutu Formation and Xibeikulas Formation in turn, which were formed from Tournaisian to Visean of Early Carboniferous. |
| Keywords: | West Junggar Baogutu Volcanics Zircon U-Pb dating |
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