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Rodinia超大陆裂谷裂陷高潮与裂-拗转换:来自塔里木西北缘阿克苏地区碎屑锆石的制约
投稿时间:2020-03-18  修订日期:2020-05-29  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2020100
摘要点击次数: 246
全文下载次数: 232
作者单位地址
刘博 中国地质科学院 地质力学研究所 国土资源部古地磁与古构造重建重点实验室北京 100081合肥工业大学 资源与环境工程学院, 安徽合肥 230009 北京市海淀区民族大学南路11号 中国地质科学院地质力学研究所 100081
张文高 中国地质科学院 地质力学研究所 国土资源部古地磁与古构造重建重点实验室北京 100081 北京市海淀区民族大学南路11号 中国地质科学院地质力学研究所 100081
陈正乐 中国地质科学院 地质力学研究所 国土资源部古地磁与古构造重建重点实验室北京 100081 
袁峰 合肥工业大学 资源与环境工程学院, 安徽合肥 230009 
韩凤彬 中国地质科学院 地质力学研究所 国土资源部古地磁与古构造重建重点实验室北京 100081 
霍海龙 中国地质科学院 地质力学研究所 国土资源部古地磁与古构造重建重点实验室北京 100081 
李季霖 中国地质科学院 地质力学研究所 国土资源部古地磁与古构造重建重点实验室北京 100081合肥工业大学 资源与环境工程学院, 安徽合肥 230009 
中文摘要:阿克苏地区位于塔里木地块西北缘,是研究Rodinia超大陆裂谷裂解过程的关键地区。在阿克苏地区裂谷序列中,发育有不整合面。通过对阿克苏地区巧恩布拉克组、尤尔美那克组和苏盖特布拉克组的碎屑锆石进行LA-ICP-MS U-Pb年龄测定,对Rodinia超大陆裂谷期不整合面的形成时间、不整合面上下地层的物源变化以及不整合面的构造意义进行了讨论。碎屑锆石测年结果显示:尤尔美那克组于708Ma后开始沉积,苏盖特布拉克组于577Ma后开始沉积,被剥蚀的阿克苏群为尤尔美那克组和苏盖特布拉克组提供了局部物源。结合前人资料分析表明:①巧恩布拉克组与尤尔美那克组之间角度不整合面形成于717~708Ma之间,苏盖特布拉克组与下伏地层间不整合面形成于580~577Ma之间;②阿克苏地区724~717Ma之间发生了一次幕式裂陷作用,这次幕式裂陷作用可能代表了Rodinia超大陆裂谷裂陷期的高潮;③苏盖特布拉克组与下伏地层间不整合面是Rodinia超大陆裂谷裂-拗转换界面,这个界面时限为580~577Ma;④“雪球地球”事件显著地促进了不整合面形成时的剥蚀作用,巧恩布拉克组与尤尔美那克组之间的角度不整合面、苏盖特布拉克组与下伏地层之间的不整合面的形成分别受到了Sturtian冰期、Gaskiers冰期的影响。在本文中,不仅阿克苏地区裂谷期不整合面的成因机制得到了探讨,也一并完善了阿克苏地区裂谷的演化模式。
中文关键词:不整合  Rodinia  裂陷高潮  裂-拗转换  塔里木  阿克苏  碎屑锆石
 
The climax of the taphrogenesis stage and the taphrogenesis-depression transition of the Rodinia Supercontinent Rift: Evidence of detrital zircons from the Aksu area,northwestern Tarim Basin
Author NameAffiliationAddress
liu bo Key Laboratory of Paleomagnetism and Tectonic Reconstruction of Ministry of Land and Resources , Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, Anhui, China 
北京市海淀区民族大学南路11号 中国地质科学院地质力学研究所 100081
zhang wengao Key Laboratory of Paleomagnetism and Tectonic Reconstruction of Ministry of Land and Resources , Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China 北京市海淀区民族大学南路11号 中国地质科学院地质力学研究所 100081
chen zhengle Key Laboratory of Paleomagnetism and Tectonic Reconstruction of Ministry of Land and Resources , Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China 
yuan feng School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, Anhui, China 
han fengbin Key Laboratory of Paleomagnetism and Tectonic Reconstruction of Ministry of Land and Resources , Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China 
huo hailong Key Laboratory of Paleomagnetism and Tectonic Reconstruction of Ministry of Land and Resources , Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China 
li jilin Key Laboratory of Paleomagnetism and Tectonic Reconstruction of Ministry of Land and Resources , Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, Anhui, China 
Abstract:The Aksu area is located in the northwestern margin of the Tarim Block, and it is the key area to study the breakup process of the Rodinia Supercontinent Rift. Unconformities are found in the rift sequence of the Aksu area.Based on LA-ICP-MS U-Pb dating of detrital zircons from the Qiaoenbrak Formation,the Yuermeinak Formation and the Sugetbrak Formation in the Aksu area, the formation time of the unconformities, the provenance of strata both below and above the unconformities and the tectonic significance of the unconformities are discussed.Detrital zircon dating results show that the Yuermeinak Formation began to deposit after 708 Ma,the Sugetbrak Formation began to deposit after 577 Ma,and the Aksu Group is the possible source for the Yuermeinak Formation and the Sugetbrak Formation.Combined with previous studies,our analysis shows that:①The angular unconformity between the Qiaoenbrak Formation and the Yuermeinak Formation was formed between 717Ma and 708 Ma, and the unconformity between the Sugetbrak Formation and the underlying strata was formed between 580 Ma and 577 Ma.②An episodic taphrogenesis occurred between 724Ma and 717Ma in the Aksu area, which may represent the climax of the taphrogenesis stage of the Rodinia Supercontinent Rift.③The unconformity between the Sugetbrak Formation and the underlying strata was the taphrogenesis-depression transition interface of the Rodinia supercontinent rift,and the interface was formed between 580Ma and 577Ma.④The "Snowball Earth" event significantly promoted the formation of the unconformities. The formation of the angular unconformity between the Qiaoenbrak Formation and the Yuermeinak Formation, and the formation of the unconformity between the Sugetbrak Formation and the underlying strata were affected by the Sturtian Glaciation and the Gaskiers Glaciation, respectively.Not only the formation mechanism of the unconformities during rifting in the Aksu area is discussed, but also the rift evolution model in the Aksu area is proposed.
keywords:unconformity  Rodinia  taphrogenesis climax  taphrogenesis-depression transition  Tarim  Aksu  detrital zircons
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