塔里木盆地西北缘新元古界层序地层划分及区域对比意义
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本文为国家重点研发计划项目(编号2022YFF0800302)、中国石油天然气股份有限公司前瞻性与基础性重大科技项目(编号2021DJ0603)和国家自然科学基金项目(编号41703017)联合资助的成果


Neoproterozoic sequence stratigraphy in the northwestern margin of the Tarim basin and its regional correlation significance
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    摘要:

    进行塔里木盆地新元古界层序划分及区域对比,有助于盆地形成早期环境演化研究与深部油气勘探。本文以塔里木盆地西北缘为例,通过新元古界沉积特征详尽剖析,划分了地层序列,进一步结合前人成果,对盆地周缘新元古界层序地层进行了区域对比。结果表明,受塔里木新元古代裂谷盆地演化的“裂陷—裂拗转换—拗陷”三个阶段控制,盆地西北缘新元古界可划分为三个二级层序:层序Sq1形成于成冰纪早期裂陷阶段,由成冰系东巧恩布拉克组和牧羊滩组构成,分布于孤立的小型地垒地堑盆地,主要发育冰川及浅水陆棚沉积;层序Sq2形成于成冰纪晚期—埃迪卡拉纪早期裂—拗转换阶段,由成冰系尤尔美那克组与埃迪卡拉系苏盖特布拉克组构成,因盆地连通性加强而分布范围增大,发育冰川、潮坪及浅水陆棚沉积;层序Sq3形成于埃迪卡拉纪晚期拗陷阶段,由埃迪卡拉系奇格布拉克组构成,地层向隆起上超且分布范围广,发育碳酸盐岩台地沉积。根据塔里木盆地新元古代沉积构造演化背景及年代地层格架,盆地西北缘阿克苏地区新元古界三分的层序充填样式可与盆地东北缘库鲁克塔格地区、西南缘叶城地区对比,其中Sq1层序及Sq2层序底部冰川杂砾岩分别与全球成冰纪Sturtian和Marinoan冰期沉积对应。

    Abstract:

    The division and regional correlation of Neoproterozoic sequence in the Tarim basin are helpful for the study of early environmental evolution and deep oil and gas exploration in the basin. Integrating results of previous studies with an analysis of the sedimentary characteristics of the Neoproterozoic successions in the Aksu area of the northwestern Tarim basin, a detailed investigation on sequence filling pattern of this area and its regional significance of sequence correlation were carried out. Associated with the three- stage evolution of the rift basin, the Neoproterozoic successions of the northwestern margin of the Tarim basin can be divided into three sedimentary sequences. During the syn- rifting stage at the early Cryogenian, Sq1, composed of glacial and shallow- water shelf deposits in the Dongqiaoenbrak Formation and the Muyangtan Formation, was formed and distributed in isolated small barrier- graben basins. During the rifting- to- depression transformation stage at the late Cryogenian- early Ediacaran period, Sq2 was formed. Due to enhanced connectivity of the rifting basin, it had larger distribution range and was composed of the Youermeinak Formation and Sugetbulak Formation, developing glacial, tidal and shallow water shelf deposits. During the depression stage at the late Ediacaran period, Sq3 was formed. It was composed of the Chigebulak Formation and developed carbonate platform deposits. According to the sedimentary- tectonic background and chronological stratigraphic framework of the Tarim basin, the Neoproterozoic sequence filling pattern in the Aksu area of the northwestern basin, characterized by three stage, can be compared with the Kuruktag area of the northeastern basin and the Yecheng area of the southwestern basin, and the diamictites at the bottom of the Sq1 and Sq2 correspond to the global Sturtian and Marinoan glaciation, respectively.

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沈卫兵,王义凤,谢鸿哲,王勋,何源.2023.塔里木盆地西北缘新元古界层序地层划分及区域对比意义[J].地质学报,97(12):3967-3983.
SHEN Weibing, WANG Yifeng, XIE Hongzhe, WANG Xun, HE Yuan.2023. Neoproterozoic sequence stratigraphy in the northwestern margin of the Tarim basin and its regional correlation significance[J]. Acta Geologica Sinica,97(12):3967-3983.

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  • 收稿日期:2023-01-20
  • 最后修改日期:2023-06-05
  • 录用日期:2023-07-26
  • 在线发布日期: 2023-12-27
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