古地理学报 ›› 2022, Vol. 24 ›› Issue (4): 649-662. doi: 10.7605/gdlxb.2022.04.054

• 岩相古地理学及沉积学 • 上一篇    下一篇

东秦岭陕西聂家沟剖面二叠纪—三叠纪之交沉积特征及其古环境意义*

李飞洋1,2, 张立军1,2, 李泰然1, 杨琦琦1, 牛永斌1,2, 宋慧波1,2   

  1. 1 河南理工大学资源环境学院,河南省生物遗迹与成矿过程重点实验室,河南焦作 454003;
    2 中原经济区煤层(页岩)气河南省协同创新中心,河南焦作 454003
  • 收稿日期:2021-12-29 修回日期:2022-03-12 出版日期:2022-08-01 发布日期:2022-08-09
  • 通讯作者: 张立军,男,1982年生,河南理工大学资源环境学院副教授,主要从事沉积学、遗迹学等研究。E-mail: Ljzhanghpu@gmail.com
  • 作者简介:李飞洋,男,1993年生,河南理工大学资源环境学院硕士研究生,从事沉积学研究。E-mail: 1169006628@qq.com。
  • 基金资助:
    *国家自然科学基金项目(编号: 41602112)、河南省自然科学基金(编号: 212300410349)、河南省高校基本科研业务费专项(编号: NSFRF200340)与河南理工大学创新型科研团队(编号: 2022-05)

Sedimentary characteristics and palaeoenvironmental significance of the Permian-Triassic transition at Niejiagou section of Shaanxi in eastern Qinling

LI Feiyang1,2, ZHANG Lijun1,2, LI Tairan1, YANG Qiqi1, NIU Yongbin1,2, SONG Huibo1,2   

  1. 1 Institute of Resources and Environment,Key Laboratory of Biogenic Trace and Sedimentary Minerals of Henan Province, Henan Polytechnic University,Henan Jiaozuo 454003, China;
    2 Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region, Henan Jiaozuo 454003, China
  • Received:2021-12-29 Revised:2022-03-12 Online:2022-08-01 Published:2022-08-09
  • Contact: ZHANG Lijun,born in 1982,an associate professor of Henan Polytechnic University,is engaged in ichnology and sedimentology. E-mail: Ljzhanghpu@gmail.com.
  • About author:LI Feiyang,born in 1993,is a master degree candidate. He is engaged in sedimentology. E-mail: 1169006628@qq.com.
  • Supported by:
    National Natural Sicence Foundation of China(No.41602112),the Natural Science Foundation of Henan(No.212300410349),and the Fundamental Research Funds for the Universities of Henan Province(No. NSFRF200340),and the Program for Innovative Research Team(in Science and Technology)of Henan Polytechnic University(No.2022-05)

摘要: 东秦岭陕西镇安聂家沟地区二叠纪—三叠纪之交发育一套海相碳酸盐岩沉积序列,较完整地记录了二叠纪末生物大灭绝事件前后浅海碳酸盐岩台地相生物群落演替及环境变化等信息,是研究二叠纪末生物大灭绝事件前后生态环境变化与沉积响应的理想区域。通过碳酸盐岩微相分析方法,对陕西镇安聂家沟剖面二叠系—三叠系界线附近的碳酸盐岩生物组合和微相类型进行了详细分析,共识别出11个微相类型: 斑点状凝块石、叠层石灰岩、鲕粒—纹层状叠层石灰岩、有孔虫颗粒灰岩、藻—海百合泥粒灰岩、含有被包壳和被磨蚀骨屑颗粒的粒泥灰岩、鲕粒颗粒灰岩、集合颗粒灰岩、含鲕粒的粒泥灰岩、泥晶灰岩和泥岩。根据碳酸盐岩微相特征及沉积相标志,在二叠系—三叠系界限附近划分出台地边缘、开阔台地和局限台地3种沉积相,其反映了二叠纪—三叠纪之交频繁的沉积相带变更的特点。该剖面碳酸盐岩微相反映的古生态和生物群落演替特征与中国华南同时期其他剖面具有较好的一致性,即二叠纪末生物大灭绝事件之后,早三叠世正常浅水碳酸盐岩台地生物类型和丰度极低,仅含有少量的双壳类、海百合等,灭绝事件界线附近以微生物碳酸盐岩等特殊微生物沉积构造占主导,之后微生物岩等消失,又出现了以双壳类为首的生物碎屑石灰岩。研究结果为了解二叠纪末生物大灭绝事件中生物和环境的协同演化提供了新的材料和认识。

关键词: 碳酸盐岩微相, 生物群落演替, 沉积环境, 二叠纪末生物大灭绝, 秦岭

Abstract: The marine carbonate strata of the Permian-Triassic transition were found in the Niejiagou section of Zhen'an,Shaanxi. It records the succession of biota and environmental changes of shallow-marine carbonate platform in the Permian-Triassic transition,and is a perfect area for studying the depositional response and palaeoenvironmental changes before and after the end-Permian mass extinction. Based on the detailed analysis of carbonate microfacies and biology combination in the Permian-Triassic transition of the Neijiagou section,11 microfacies types are identified,including patched agglomerates,stromatolites,oolitic-layered stromatolites,foraminiferal grainstone,algal-crinoid grainstone,wackestone containing coated and eroded bone debris particles,oolitic grainstone,aggregate grainstone,oolitic wackestone,mudstone and micrite. According to the characteristics of carbonate microfacies and sedimentary indicators,marginal shoal facies,open platform facies and restricted platform facies are divided in the Permian-Triassic transition. The microfacies characteristics reflect frequent sedimentary microfacies changes in the Permian-Triassic transition. The biological succession and stratigraphic sequence of the Permian-Triassic transition in the Niejiagou section have good uniformity correlation with other sections in South China. After the end-Permian mass extinction,low biodiversity and biological abundance,e.g.,small bivalves and crinoid,occur in the shallow-marine carbonate platform in the Early Triassic. The special microbial sedimentary structures dominated around the mass extinction event boundary. Afterwards,the microbialites disappeared and the bioclastic limestone reoccupied. This research can provide new understanding for the coevolution of organisms and the environment caused by the end-Permian mass extinction.

Key words: carbonate microfacies, community succession, sedimentary environment, end-Permian mass extinction, Qinling

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