扬子克拉通北缘中元古界神农架群台子组沉积特征<sup>&#x0002A;</sup>

doi:10.7605/gdlxb.2018.04.041

古地理学报 ›› 2018, Vol. 20 ›› Issue (4): 563-578. doi: 10.7605/gdlxb.2018.04.041

• 中新元古代沉积地层研究 • 上一篇下一篇

扬子克拉通北缘中元古界神农架群台子组沉积特征^*

夏晓旭^1,2, 旷红伟², 宋天锐², 柳永清², 彭楠², 朱志才², 许欢², 安伟², 王能盛², 范正秀², 王玉冲^1,2

1 中国地质大学(北京),北京 100083;
2 中国地质科学院地质研究所,北京 100037

收稿日期:2018-04-02 修回日期:2018-06-01 出版日期:2018-08-01 发布日期:2018-07-31
通讯作者: 旷红伟,女,1969年生,教授,主要研究方向为沉积学、地层学及油气地质。E-mail: kuanghw@126.com。彭楠,男,1983年生,助理研究员,主要从事沉积地质学及古地理学研究。E-mail: pengnan19830120@126.com。
作者简介:夏晓旭,女,1994年生,硕士研究生,古生物学与地层学专业。E-mail: xiaxiaoxu922@126.com。
基金资助:
*国家重点研发计划深地资源勘查开采重点专项(编号: 2016YFC0601001)、国家自然科学基金项目(编号: 41472082)、中国地质调查局项目(编号: DD20160120-01)和全国地层委员会与神农架世界地质公园共同资助

Sedimentary characteristics of the Mesoproterozoic Taizi Formation of Shennongjia Group in northern margin of Yangtze Craton

Xia Xiao-Xu^1,2, Kuang Hong-Wei², Song Tian-Rui², Liu Yong-Qing², Peng Nan², Zhu Zhi-Cai², Xu Huan², An Wei², Wang Neng-Sheng², Fan Zheng-Xiu², Wang Yu-Chong^1,2

1 China University of Geosciences(Beijing),Beijing 100083;
2 Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037

Received:2018-04-02 Revised:2018-06-01 Online:2018-08-01 Published:2018-07-31
Contact: Kuang Hong-Wei,born in 1969,is a professor in the Institute of Geology,Chinese Academy of Geological Sciences. She is mainly engaged in sedimentology, stratigraphy and petroleum geology. E-mail: kuanghw@126.com. Peng Nan,born in 1983,is a research assistant in the Institute of Geology,CAGS. He is mainly engaged in sedimentary geology and palaeogeography. E-mail: pengnan19830120@126.com.
About author:Xia Xiao-Xu,born in 1994,is a master candidate of China University of Geosciences(Beijing). She majors in paleontology and stratigraphy. E-mail: xiaxiaoxu922@126.com.
Supported by:
Co-funded by the National Key Research and Development Program of China(No.2016YFC0601001),the National Natural Science Foundation of China(No.41472082),the China Geological Survey Projects(No. DD20160120-01) and the Project of Shennongjia Global Geopark

摘要/Abstract

摘要： 有关扬子克拉通北缘神农架地区中元古界神农架群台子组沉积环境的认识一直存有分歧,文中基于野外和室内的综合研究讨论了台子组的沉积环境。台子组底部为蛋青色砂砾岩,下部为灰色、肉粉色细粉晶白云岩,中部为灰绿色、浅灰色石英中—细砂岩、粉砂岩与深灰色粉砂岩、粉砂质泥岩和泥质粉砂岩组合,上部则是粉砂岩—泥岩韵律。同时,台子组石英砂岩中以发育块状层理和平行层理为主,粉砂岩和泥岩则发育丰富的水平层理和透镜状层理。砂岩粒度概率累计曲线显示斜率较大,跳跃组分为主,悬浮组分含量低,无滚动组分,其中跳跃组分又以二段或多段式为特征。上述沉积指相标志和粒度分析均表明,台子组形成于滨岸与潮坪沉积环境,同时纵向沉积序列上,碎屑岩沉积物粒度表现为粗—细—粗—细演化特征,沉积相由下部到上部呈现滨岸相—碳酸盐岩缓坡台地相—潟湖相—潮坪相—潟湖相的演替规律,总体上构成由退积—进积—退积—进积的沉积序列。

关键词: 神农架群, 台子组, 沉积相, 碎屑岩, 粒度分析

Abstract: Sedimentary environments of the Mesoproterozoic Taizi Formation of Shennongjia Group in Shengnongjia area, northern margin of Yangtze Craton are all along in debate. In this study,we further constrain the sedimentary environments of the Taizi Formation based on the comprehensive field and laboratory experiments. The lower part of the Taizi Formation consists of gray green silty-fine dolostone. The middle part of the Taizi Formation is composed of gray green,grayish quartz medium-fine sandstones,siltstones and dark grey siltstones,silty mudstones,muddy siltstones rhythms,while its upper part comprises siltstone-mudstone rhythm. Massive beddings and parallel beddings occur in the quartz sandstone,while siltstones and mudstones contain the horizontal and lenticular beddings. The cumulative probability curve of sandstones shows a steep slope,which are made up mainly of jumping components with two or more groups and little suspended components without rolling components. The sedimentary structures and grain size characteristics suggest that the Taizi Formation was formed in the coastal and tidal flat depositional environments. Meanwhile,the vertical sedimentary sequences are represented by the grain size evolution of coarse-fine-coarse-fine,which is combined with that the sedimentary facies from the bottom to the top show littoral facies-carbonate ramp platform facies-lagoon facies-tidal flat lagoon facies succession,constitute a complete transgressive-regressive sedimentary sequence with patterns of progradation-retrogradation-progradation.

Key words: Shennongjia Group, Taizi Formation, sedimentary facies, clastic rock, grain size analysis

中图分类号:

P512

夏晓旭, 旷红伟, 宋天锐, 柳永清, 彭楠, 朱志才, 许欢, 安伟, 王能盛, 范正秀, 王玉冲. 扬子克拉通北缘中元古界神农架群台子组沉积特征^*[J]. 古地理学报, 2018, 20(4): 563-578.

Xia Xiao-Xu, Kuang Hong-Wei, Song Tian-Rui, Liu Yong-Qing, Peng Nan, Zhu Zhi-Cai, Xu Huan, An Wei, Wang Neng-Sheng, Fan Zheng-Xiu, Wang Yu-Chong. Sedimentary characteristics of the Mesoproterozoic Taizi Formation of Shennongjia Group in northern margin of Yangtze Craton[J]. JOPC, 2018, 20(4): 563-578.

http://www.gdlxb.cn/CN/Y2018/V20/I4/563

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Sedimentary characteristics of the Mesoproterozoic Taizi Formation of Shennongjia Group in northern margin of Yangtze Craton

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扬子克拉通北缘中元古界神农架群台子组沉积特征*

Sedimentary characteristics of the Mesoproterozoic Taizi Formation of Shennongjia Group in northern margin of Yangtze Craton

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扬子克拉通北缘中元古界神农架群台子组沉积特征^*