| 准噶尔南缘古生代晚期盆山关系:阿尔巴萨依组火山岩锆石SHRIMPU-Pb定年及岩石地球化学限定 |
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| 引用本文： | 刘冬冬,郭召杰,张志诚,吴朝东.准噶尔南缘古生代晚期盆山关系:阿尔巴萨依组火山岩锆石SHRIMPU-Pb定年及岩石地球化学限定[J].岩石学报,2012,28(8):2355-2368. |
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| 作者姓名： | 刘冬冬 郭召杰 张志诚 吴朝东 |
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| 作者单位： | 造山带和地壳演化教育部重点实验室,北京大学地球与空间科学学院,北京100871 |
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| 基金项目： | 本文受国家科技重大专项(2011ZX05009-001)资助 |
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| 摘 要： | 准噶尔盆地南缘沿巴音沟蛇绿岩带北侧发育一套晚古生代(原下二叠统)阿尔巴萨依组中基性、酸性火山岩夹火山碎屑岩.采用锆石SHRIMP U-Pb定年方法,对其中流纹岩进行定年,得到年龄为307.2±1.3Ma(MSWD=1.2),表明原定为早二叠世的阿尔巴萨依组火山岩的确切喷发时间为晚石炭世.地球化学分析表明,阿尔巴萨依组火山岩为钙碱性和高钾钙碱性系列,富集轻稀土(LREE),轻重稀土有一定程度的分馏,富集大离子亲石元素(LILE),亏损Nb、Ta等高场强元素,流纹岩有Ba、Sr、P、Eu、Ti的异常.阿尔巴萨依组火山岩的εNd (t)值在+4.21～+7.79之间,显示源区富集特征.晚石炭世阿尔巴萨依组火山岩、火山碎屑岩与后碰撞A型花岗岩在岩石学、地球化学特征方面相似,表明两者应有相似的构造背景,都为后碰撞伸展环境.阿尔巴萨依组还发育一套火山沉积地层,表明准噶尔南缘沉积作用在晚石炭世已经开始,开始沉积盆地的类型应为伸展断陷盆地.
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| 关 键 词： | 准噶尔南缘 古生代晚期火山岩 锆石SHRIMP定年 地球化学特征 后碰撞 伸展断陷盆地 |
| 收稿时间： | 7/3/2011 12:00:00 AM |
| 修稿时间： | 2011/11/6 0:00:00 |
The Late Paleozoic tectonic relationship between the Tian Shan orogenic belt and Junggar basin: Constraints from zircon SHRIMP U-Pb dating and geochemistry characteristics of volcanic rocks in Arbasay Formation |
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| LIU DongDong,GUO ZhaoJie,ZHANG ZhiCheng and WU ChaoDong.The Late Paleozoic tectonic relationship between the Tian Shan orogenic belt and Junggar basin: Constraints from zircon SHRIMP U-Pb dating and geochemistry characteristics of volcanic rocks in Arbasay Formation[J].Acta Petrologica Sinica,2012,28(8):2355-2368. |
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| Authors: | LIU DongDong GUO ZhaoJie ZHANG ZhiCheng and WU ChaoDong |
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| Institution: | Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China;Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China;Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China;Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China |
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| Abstract: | |
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| Keywords: | Southern Junggar basin Latest Paleozoic volcanic rocks Zircon SHRIMP U-Pb dating Geochemistry characteristics Post-collision Extensional depression basin |
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