吉林大学学报(地球科学版) ›› 2018, Vol. 48 ›› Issue (1): 165-180.doi: 10.13278/j.cnki.jjuese.20160232

• 地质与资源 • 上一篇    下一篇

三峡地区新元古代莲沱组底部凝灰岩锆石SHRIMP U-Pb年代学及其地质意义

景先庆1, 杨振宇2, 仝亚博3, 王恒4, 徐颖超5   

  1. 1. 南京大学地球科学与工程学院, 南京 210093;
    2. 首都师范大学地球空间信息科学与技术国际化示范学院, 北京 100048;
    3. 中国地质科学院地质力学研究所, 北京 100081;
    4. 中国地震局地质研究所, 北京 100029;
    5. 中国地质大学地球科学学院, 武汉 430074
  • 收稿日期:2016-09-12 出版日期:2018-01-26 发布日期:2018-01-26
  • 通讯作者: 杨振宇(1963-),男,教授,博士生导师,主要从事古地磁与大地构造学方面的研究,E-mail:yangzhenyu@cags.ac.cn E-mail:yangzhenyu@cags.ac.cn
  • 作者简介:景先庆(1988-),男,博士研究生,主要从事古地磁与大地构造学方面的研究,E-mail:jktsjisgeo@hotmail.com
  • 基金资助:
    国家自然科学基金项目（41230208）

A SHRIMP U-Pb Zircon Geochronology of a Tuff Bed from the Bottom of Liantuo Formation in the Three Gorges Area and Its Geological Implications

Jing Xianqing1, Yang Zhenyu2, Tong Yabo3, Wang Heng4, Xu Yingchao5   

  1. 1. School of Earth Sciences and Engineering, Nanjing University, Nanjing 210093, China;
    2. College of Geospatial Information Science and Technology, Capital Normal University, Beijing 100048, China;
    3. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China;
    4. Institute of Geology, China Earthquake Administration, Beijing 100029, China;
    5. School of Earth Sciences, China University of Geosciences, Wuhan 430074, China
  • Received:2016-09-12 Online:2018-01-26 Published:2018-01-26
  • Supported by:
    Supported by National Natural Science Foundation of China (41230208)

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摘要： 湖北三峡地区发育一套新元古代地层，其可能记录了地球系统的一系列剧变，如莲沱组可能记录了与Rodinia超大陆的裂解以及南华冰期起始时间等相关的地质信息。然而，莲沱组的沉积年龄及区域地层对比却仍存在较大争议，限制了我们对这些地质信息的理解。本文从花鸡坡剖面莲沱组底部凝灰岩层获得两组SHRIMP U-Pb锆石年龄（810±7）、（763±10）Ma，前者可能为莲沱组下伏黄陵花岗岩剥蚀后再沉积的结果，而后者应代表莲沱组底部沉积开始的年龄。结合前人在三峡地区对莲沱组地层年代学的研究，认为莲沱组沉积年龄为780~714 Ma，区域上可与滇中、川西澄江组/开建桥组及湘北的板溪群、黔东南的下江群及桂北的丹洲群进行对比，但其缺失下江系早期—中早期（820~790 Ma）沉积地层，因此只相当于下江群、丹洲群的中上部地层。

关键词: 莲沱组, 凝灰岩, SHRIMP U-Pb锆石定年, 区域地层对比, 湖北三峡地区

Abstract: The Mid-late Neoproterozoic strata in the Three Gorges area may record a series drastic changes on the earth system. Although the Liantuo Formation may experience the breakup of the Rodinia and the start age of the Nanhuan glaciation, its age and regional stratigraphic correlation are controversial. In this study, we obtained two SHRIMP U-Pb age of (810±7) Ma and (763±10) Ma from a tuff bed in the bottom of the Liantuo Formation. The older one may represent the resedimentation of the Huangling granites. Together with the reported ages, we suggest that the Liantuo Formation in the Three Gorges area was deposited during 780-714 Ma. The regional stratigraphic correlation suggests that the Liantuo Formation is related to Chengjing/Kaijianqiao Formation and the Banxi, Xiajiang and Danzhou Group. Whereas, due to the lack of the early stage deposition (820-790 Ma), the Liantuo Formation can be related only to the mid-upper part of the Xiajiang Group and Danzhou Group.

Key words: Liantuo Formation, tuff, SHRIMP U-Pb zircon geochronology, regional correlation, Three Gorges area

中图分类号: 

  • P588.1
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