| 塔里木地块西北缘阿克苏地区新元古代冰碛岩年代与冰期事件 |
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| 引用本文： | 李王鹏,王毅,李慧莉,张仲培,刘少峰,杨伟利,蔡习尧,聂海宽,钱涛,李晓剑.塔里木地块西北缘阿克苏地区新元古代冰碛岩年代与冰期事件[J].现代地质,2022,36(1):27-47. |
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| 作者姓名： | 李王鹏 王毅 李慧莉 张仲培 刘少峰 杨伟利 蔡习尧 聂海宽 钱涛 李晓剑 |
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| 作者单位： | 1. 中国石油化工股份有限公司 石油勘探开发研究院,北京 1000832. 中国地质大学(北京) 地球科学与资源学院,北京 1000833. 中国地质科学院 地质力学研究所,北京 1000814. 东华理工大学 地球科学学院,江西 南昌 330013 |
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| 基金项目： | 国家自然科学基金项目(41902149,41702238)； |
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| 摘 要： | 塔里木地块新元古代冰期事件等时性对比存在争议,获得可靠的新元古代冰碛岩沉积时代意义重大.塔里木地块西北缘阿克苏地区出露2套新元古代冰碛岩沉积,通过对其进行岩石学、同位素年代学、岩石地球化学等分析,明确其沉积物岩石组合特征、限定其沉积时代、讨论其古气候风化条件等.化学蚀变指数(CIA)指示研究区的2套新元古代冰碛岩代表了...
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| 关 键 词： | 塔里木地块 新元古代 冰碛岩 碎屑锆石 化学蚀变指数 |
| 收稿时间： | 2021-03-04 |
| 修稿时间： | 2021-11-22 |
Geochronology and Glaciation of the Neoproterozoic Diamictite in Aksu Area,Northwestern Margin of the Tarim Block |
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| LI Wangpeng,WANG Yi,LI Huili,ZHANG Zhongpei,LIU Shaofeng,YANG Weili,CAI Xiyao,NIE Haikuan,QIAN Tao,LI Xiaojian.Geochronology and Glaciation of the Neoproterozoic Diamictite in Aksu Area,Northwestern Margin of the Tarim Block[J].Geoscience——Journal of Graduate School,China University of Geosciences,2022,36(1):27-47. |
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| Authors: | LI Wangpeng WANG Yi LI Huili ZHANG Zhongpei LIU Shaofeng YANG Weili CAI Xiyao NIE Haikuan QIAN Tao LI Xiaojian |
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| Institution: | 1. Petroleum Exploration and Production Research Institute, SINOPEC, Beijing 100083, China2. School of Earth Science and Mineral Resources, China University of Geosciences, Beijing 100083, China3. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China4. School of Earth Sciences,East China University of Technology,Nanchang,Jiangxi 330013,China |
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| Abstract: | Age correlation of the Neoproterozoic glaciation events in the Tarim Block remains controversial, and obtaining reliable deposition time for the Neoproterozoic diamictite is crucial.Two sets of the Neoproterozoic diamictite were developed in Aksu area along the northwestern margin of the Tarim Block. Petrologic and whole-rock geochemical analyses and radiometric dating were conducted to define the sedimentary rock assemblages,deposition time, and paleoclimatic weathering conditions. The chemical index of alteration (CIA) indicates that the Qiaoenbrak and Yuermeinak Formations represent two distinct glaciation episodes, and two secondary glaciation events exist in the Qiaoenbrak glaciation.Detrital zircon U-Pb dating of the glacial deposits and their adjacent beds indicate that the Qiaoenbrak glaciation in Aksu started along the northwestern margin of the TarimBlock after (719±10) Ma, whilst the Yuermeinak glaciation did not start before (685±11) Ma, and its cessation timing can be constrained by the top boundary age of the Nanhua System (635 Ma) or the U-Pb age of the overlying Sinian Sugetbrak Formation basalt (615±5 Ma).Comprehensive analyses of isotope geochronology, geochemistry, and sedimentology indicate that the Qiaoenbrak glaciation (Aksu area) corresponded to the Altungol glaciation (Quruqtagh area), the Jiangkou glaciation (South China), and the Sturtian glaciation (global). Meanwhile, the Yuermeinak glaciation (Aksu area) corresponded to the Tereekan glaciation (Quruqtagh area), the Nantuo glaciation (South China), and the Marinoan glaciation (global). Glaciation, isotopic geochronology, and geochemistry can provide a basis for the division and comparison of the Neoproterozoic sequences in the Tarim Block. |
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| Keywords: | Tarim Block Neoproterozoic diamictite detrital zircon chemical index of alteration |
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