鱼粪化石特征对早侏罗世托阿尔期湖泊生态系统的启示:以川东大安寨段为例<sup>&#x0002A;</sup>

doi:10.7605/gdlxb.2021.03.031

古地理学报 ›› 2021, Vol. 23 ›› Issue (3): 600-609. doi: 10.7605/gdlxb.2021.03.031

所属专题：化石资料在地质学研究中的应用；

• 生物古地理学及古生态学 • 上一篇下一篇

鱼粪化石特征对早侏罗世托阿尔期湖泊生态系统的启示:以川东大安寨段为例^*

周小梅¹, 金鑫^1,2, 吴强旺¹, 葛禹¹, 时志强^1,2

1 成都理工大学沉积地质研究院,四川成都 610059;
2 成都理工大学油气藏地质及开发工程国家重点实验室,四川成都 610059

收稿日期:2020-08-09 修回日期:2020-10-22 出版日期:2021-06-01 发布日期:2021-05-25
通讯作者: 时志强,男,1972年生,成都理工大学沉积地质研究院教授。E-mail: szqcdut@163.com。
作者简介:周小梅,女,1994年生,硕士研究生,成都理工大学沉积地质研究院古生物学与地层学专业。E-mail: 276378283@qq.com。
基金资助:
*国家自然科学基金项目(编号: 41902106,41572085)资助

Enlightment of fish coprolites characteristics on lake ecosystem in Early Jurassic Toarcian: taking the Da’anzhai Member in northeast Sichuan Basin as an example

Zhou Xiao-Mei¹, Jin Xin^1,2, Wu Qiang-Wang¹, Ge Yu¹, Shi Zhi-Qiang^1,2

1 Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu 610059,China;
2 State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology, Chengdu 610059,China

Received:2020-08-09 Revised:2020-10-22 Online:2021-06-01 Published:2021-05-25
Contact: Shi Zhi-Qiang,born in 1972,is a professor of Institute of Sedimentary Geology,Chengdu University of Technology. E-mail: szqcdut@163.com.
About author:Zhou Xiao-Mei,born in 1994,is a master degree candidate of paleontology and stratigraphy in Institute of Sedimentary Geology,Chengdu University of Technology. E-mail: 276378283@qq.com.
Supported by:
National Natural Science Foundation of China(Nos. 41902106,41572085)

摘要/Abstract

摘要： 早侏罗世托阿尔期早期大洋缺氧事件(Toarcian Oceanic Anoxic Event,~183.8 Ma)是一次全球性的多幕式生物—环境事件,其在四川盆地下侏罗统自流井组大安寨段亦有显示。对采集自川东北地区大安寨段的鱼粪化石进行形态学描述和内含物分析,发现鱼粪化石中含有大量的磷质成分,多为未经消化的鱼骨化石,另有大量介壳类化石与有机质混杂在一起。据露头岩性和显微薄片特征认为: (1)粪化石呈螺旋状,生产该粪化石的鱼类为大型肉食性鱼类,其喜食小型鱼类和软体动物等,推测可能是肺鱼类(角齿鱼);(2)鱼粪化石形成于开放型淡水湖泊中的半深湖—深湖区,其中湖泊表层含氧量丰富,主要由生产者、消费者构成了研究区早侏罗世托阿尔期大型湖泊生态系统,食物链较为复杂,而湖底为水动力条件较弱的还原环境。该研究成果可为早侏罗世托阿尔期大洋缺氧事件在湖泊中的沉积响应及生态影响研究提供依据。

关键词: 侏罗纪, 鱼粪化石, 托阿尔期海洋缺氧事件, 黑色页岩, 四川盆地

Abstract: The Toarcian oceanic anoxic event(T-OAE,Early Jurassic)was an episode of profound environmental changes marked by a global carbon-cycle perturbation,marine mass extinctions,and black-shale deposits. Morphological description and inclusion analysis of fish coprolites collected from the Da’anzhai Member of the Lower Jurassic Ziliujing Formation in the northeast Sichuan Basin were carried out in this paper. We found that the interior of coprolites is composed of abundant organic matters,silts,incomplete clay minerals,phosphorous fossils,undigested fish bone,and a large number of ostracods. According to the morphology and microscopic examination of the coprolites,we speculate that they originated from lungfish. The fish coprolites were deposited in an intermediate to deep lake. During the Da’anzhai depositional period,the surface water of the Sichuan lake was enriched in oxygen,and the lake ecological system was healthy. The bottom of the lake was characterized by deposits of black shale,which implies an anoxic and reducing environment. The T-OAE fish coprolites may suggest a stratified water column in a Toarcian lake. The above results may provide a basis for the study of sedimentary response and ecological impact in the lake of Toarcian oceanic anoxic events of early Jurassic.

Key words: Jurassic, fish coprolite, Toarcian oceanic anoxic event, black shale, Sichuan Basin

中图分类号:

Q915.2+9

周小梅, 金鑫, 吴强旺, 葛禹, 时志强. 鱼粪化石特征对早侏罗世托阿尔期湖泊生态系统的启示:以川东大安寨段为例^*[J]. 古地理学报, 2021, 23(3): 600-609.

Zhou Xiao-Mei, Jin Xin, Wu Qiang-Wang, Ge Yu, Shi Zhi-Qiang. Enlightment of fish coprolites characteristics on lake ecosystem in Early Jurassic Toarcian: taking the Da’anzhai Member in northeast Sichuan Basin as an example[J]. JOPC, 2021, 23(3): 600-609.

http://www.gdlxb.cn/CN/Y2021/V23/I3/600

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鱼粪化石特征对早侏罗世托阿尔期湖泊生态系统的启示:以川东大安寨段为例*

Enlightment of fish coprolites characteristics on lake ecosystem in Early Jurassic Toarcian: taking the Da’anzhai Member in northeast Sichuan Basin as an example

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鱼粪化石特征对早侏罗世托阿尔期湖泊生态系统的启示:以川东大安寨段为例^*