扬子克拉通北缘中元古界神农架群层序的厘定
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本文为国家重点研发计划项目(编号 2022YFF0800302,2016YFC0601001)、国家自然科学基金项目(编号 42072135)、中国地质调查局项目(编号 DD20221649,DD20230221)和北京科委国际创新资源合作项目(编号 Z201100008320007)联合资助的成果


Revision of the Mesoproterozoic Shennongjia Group stratigraphic succession in the northern margin of the Yangtze Craton
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    摘要:

    神农架群被认为是除天津蓟县剖面外,我国出露相对最好的中元古界。由于其大致形成于1400~1000 Ma,故普遍被看好作为中国地层表中1320~1000 Ma时期地层记录缺失的候选层型剖面。尽管近年来神农架群的年代地层学、沉积学、古生物(叠层石形成与分布)及古海洋地球化学等方面研究进展显著,但有关神农架群的划分仍未达成共识。本文在神农架上前寒武系专题研究及神农架120万填图划分方案基础上,通过近十余年来对神农架群系统综合研究,重新厘定了神农架群层序。研究认为,神农架群由下至上可划分为下、中、上3个亚群,下亚群由下至上为鹰窝洞组、大岩坪组、马槽园组、乱石沟组、大窝坑组及矿石山组;中亚群包括台子组、野马河组、温水河组和石槽河组;上亚群则为下部送子园组与上部瓦岗溪组。神农架群的上述划分和层序厘定充分结合了神农架群同位素年代学、沉积地质演化、叠层石形态类型及旋回性发育特征、同位素与元素地球化学异常等特征和发育规律。本文是近10年来神农架群研究进展的总结,尽管神农架群目前已具备了建立待建系候选层型的基本条件,但其尚缺少顶界与底界层位年龄,也未见到下伏地层或基底,未来还需进一步开展综合研究。

    Abstract:

    The Shennongjia Group is considered to be the best example of Mesoproterozoic in China with the exception of the Jixian section in Tianjin. Since it was formed roughly at 1400~1000 Ma, it is generally regarded as a potential candidate for missing stratigraphic records from 1320~1000 Ma in the stratigraphic table of China. Although the studies on chronostratigraphy, sedimentology, paleontology (stromatolite formation and distribution) and paleomarine geochemistry of the Shennongjia Group have made remarkable progress in recent years, there is still no consensus on the division of this group. Based on the study of the Upper Precambrian in the Shennongjia and the Shennongjia 1200000 mapping scheme, this paper redefines the sequence of the Shennongjia Group through systematic studies undertaken in the past 10 years. It is concluded that the Shennongjia Group can be divided into three subgroups from the bottom to the top: the lower subgroup, the middle subgroup and the upper subgroup. The lower subgroup from the bottom to the top includes the Yingwodong Formation, the Dayanping Formation, the Macaoyuan Formation, the Luanshigou Formation, the Dawokeng Formation and the Kuangshishan Formation. The middle subgroup includes the Taizi Formation, the Yemahe Formation, the Wenshuihe Formation and the Shicaohe Formation. The upper subgroup includes the lower Songziyuan Formation and the upper Wagangxi Formation. The above sequence determination of the Shennongjia Group fully combine the characteristics and development laws of isotope chronology, sedimentary geological evolution, stromatolite morphological types and cyclic development, isotope and element geochemical anomalies. The results of this study are a summary of the research progress on the Shennongjia Group in the past 10 years. Although the basic conditions for establishing candidate stratotypes have been met, the Shennongjia Group not only lacks the stratigraphic ages of the top and bottom boundaries, but also fails to locate the underlying basement. Further comprehensive studies are needed in the future.

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彭楠,旷红伟,柳永清,王玉冲,陈骁帅,祁柯宁,白华青,刘燕学,宋换新,唐永,东归霖.2023.扬子克拉通北缘中元古界神农架群层序的厘定[J].地质学报,97(12):3902-3921.
PENG Nan, KUANG Hongwei, LIU Yongqing, WANG Yuchong, CHEN Xiaoshuai, QI Kening, BAI Huaqing, LIU Yanxue, SONG Huanxin, TANG Yong, DONG Guilin.2023. Revision of the Mesoproterozoic Shennongjia Group stratigraphic succession in the northern margin of the Yangtze Craton[J]. Acta Geologica Sinica,97(12):3902-3921.

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  • 收稿日期:2023-07-10
  • 最后修改日期:2023-09-09
  • 录用日期:2023-11-04
  • 在线发布日期: 2023-12-25
  • 出版日期: