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地质科学  2017, Vol. 52 Issue (1): 230-241    DOI: 10.12017/dzkx.2017.015
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广西来宾蓬莱滩剖面G-L界线草莓状黄铁微晶粒径特征及其氧化还原意义
韦雪梅       韦恒叶1         邱   振2,3        江增光1        白玛曲宗1
  1. 东华理工大学地球科学学院  南昌    330013;
  2.  中国石油勘探开发研究院  北京    100083;
  3.  中国石油勘探开发研究院廊坊分院  河北廊坊    065007
Framboidal microcryst size characteristics of pyrite and its redox significance across the G-L boundary in Penglaitan section,Laibin,Guangxi
Wei Xuemei1        Wei Hengye1        Qiu Zhen2,3        Jiang Zengguang1        Baima Quzong1
  1. School of Earth Science,East China University of Technology,Nanchang  330013;
  2.  Research Institute of Petroleum Exploration and Development,PetroChina,Beijing  100083;
  3.  Langfang Branch,PetroChina Exploration and Development Research Institute,Langfang,Hebei  065007
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摘要 

在瓜德鲁普统末期发生了一次大规模生物灭绝事件,多类生物均遭受重创。关于此次生物灭绝事件成因,有学者认为海洋缺氧是主要的直接原因之一,但瓜德鲁普统—乐平统(G-L)过渡时期海洋的氧化还原条件的研究开展得较少,缺少直接证据证明海洋缺氧和瓜德鲁普统末期生物灭绝的关系。草莓状黄铁矿粒径是指示沉积水体氧化还原条件的少数可靠的指标之一。由于微晶粒径大小与草莓状黄铁矿粒径大小密切相关,草莓微晶粒径大小同样也可以作为沉积水体的氧化还原指标。本文通过研究蓬莱滩剖面卡匹敦阶茅口组和吴家坪阶合山组下部草莓状黄铁矿微晶粒径特征,从而分析沉积环境的氧化还原状态。研究结果表明蓬莱滩剖面茅口组和合山组微晶粒径多数分布在0.4~1.2 μm之间,大部分样品微晶粒径分布相对较窄,部分样品分布较宽。茅口组—合山组界线处间歇性出现微晶粒径很小且分布范围窄的样品,其平均微晶粒径一般小于0.7 μm,最大值一般不超过1.2 μm,很可能指示硫化—缺氧的环境。茅口组和合山组大部分样品平均微晶粒径分布在0.7~1.0 μm之间,最大值一般不超过3.3 μm,很可能指示的是氧化—贫氧环境。蓬莱滩剖面硫化至缺氧环境对应着瓜德鲁普末期生物灭绝事件层位,说明这两者很可能存在因果关系。海洋的硫化缺氧很可能是瓜德鲁普末期生物灭绝的主要原因之一。

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韦雪梅 韦恒叶 邱 振 江增光 白玛曲宗
关键词 蓬莱滩剖面   G-L界线   黄铁矿草莓微晶   氧化还原条件   生物灭绝     
Abstract

A mass extinction took place at the end of Guadalupian,seriously killing many species. For the causes of this extinction event,some researcher suggested that the marine anoxia was one of the major causes. However,there are few studies on this redox condition during the G-L transition period,lacking of direct evidence to support the relationship between ocean anoxia and mass extinction at the end of Guadalupian. Framboidal pyrite size distribution is one of the few reliable indicators of redox conditions of sedimentation water column. Since the microcrystal size is related with framboid pyrite size,its size distribution should be also a indicator of redox condition. In this paper,we study the microcrystal size distribution across the Maokou-Heshan Formations boundary in the Penglaitan section,so as to analyze the redox conditions of water column. The studied results show that the most microcrystallite size of Maokou and Heshan Formations range from 0.4 μm to 1.2 μm and has a narrow size variation,though some of the samples show a wider variation. At the Maokou Formation-Heshan Formation boundaries,the samples with a small size (average less than 0.7 μm) and a small the maximum size (average less than 1.2 μm) intermittently occurs,likely indicating euxinic to anoxic environment. The average size of most samples from Maokou and Heshan Formations ranges from 0.7 μm to 1.0 μm with a maximum value less than 3.3 μm,probably indicating the dysoxic to oxic environment. In the Penglaitan section,the euxinic to anoxic layers is coincided with the mass extinction level at the G-L boundary,indicating a causal link between. Marine anoxia is probability one of the main causes of the end Guadalupian mass extinction.

Key words:   
收稿日期: 2016-03-10;
基金资助:

国家自然科学基金项目(编号:41302021)资助。

作者简介: 韦雪梅,女,1989年 8月生,硕士研究生,沉积学专业。E-meil:weixuemei2015@163.com
引用本文:   
韦雪梅 韦恒叶 邱 振 江增光 白玛曲宗. 2017, 广西来宾蓬莱滩剖面G-L界线草莓状黄铁微晶粒径特征及其氧化还原意义. 地质科学, 52(1): 230-241.
Wei Xuemei Wei Hengye Qiu Zhen Jiang Zengguang Baima Quzong. Framboidal microcryst size characteristics of pyrite and its redox significance across the G-L boundary in Penglaitan section,Laibin,Guangxi[J]. Chinese Journal of Geology, 2017, 52(1): 230-241.
 
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[1] 孙海涛 谢瑞 钟大康 任影 杨雪琪 钟泞聪 姜杨锦丰. 中上扬子地区震旦纪末期古海洋环境研究的若干问题[J]. 地质科学, 2018, 53(2): 697-713.
[2] 周 杰 邱 振 王红岩 卢 斌 拜文华 刘德勋 谈 昕 江增光. 草莓状黄铁矿形成机制及其研究意义[J]. 地质科学, 2017, 52(1): 242-253.
[3] 韦恒叶1|2 陈代钊1 遇昊1|2 汪建国1. 鄂西地区中二叠统栖霞组下部烃源岩形成机理[J]. 地质科学, 2011, 46(01): 68-82.
 
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