广西上泥盆统F&mdash;F界线碳同位素的变化特征

许冰; 顾兆炎; 胡滨; 李镇梁

广西上泥盆统F—F界线碳同位素的变化特征

1.
中国科学院地质与地球物理研究所北京 100029;
2.
广西区域地质调查研究院广西桂林 541003

基金项目: 国家重点基础研究发展规划专项经费资助项目(批准号:G2000077708);国家自然科学基金项目(批准号:40073031)的资助.

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作者简介:
许冰男 1969年出生博士助理研究员环境地球化学

中图分类号: P534.44;P597

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The Pattern of Variations in Carbon Isotope of the Frasnian-Famennian Limestone Sequences in Guangxi, Southern China

1.
Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029;
2.
Guangxi Institute of Regional Geology Survey, Guilin Guangxi 541003

摘要

摘要: 发生在晚泥盆世弗拉期(Frasnian)—法门期(Famennian)之交的生物灭绝事件(简称F—F事件)是古生代以来五大生物集群灭绝事件之一,其原因仍含糊不清。碳同位素研究显示,伴随F—F事件全球碳循环发生了显著的变化。但对中国南方F—F事件地层碳同位素变化特征的认识不够,缺乏系统的研究。对广西桂林杨堤上泥盆统灰岩剖面的碳同位素的分析结果表明,在上泥盆统存在两次碳同位素正偏移,分别出现在下rhenana带和F—F的界线,其中,出现在F—F界线的碳同位素正偏移与广西垌村以及欧美和非洲等地的上泥盆统F—F界线附近的碳同位素记录一致,且具有相近的变化幅度。进一步对广西桂林附近的杨堤和垌村剖面F—F界线的碳同位素组成变化模式的分析发现,这次正偏移可能是由多次次级变化组成,与F—F事件中生物的灭绝步骤相似。
- 碳同位素 /
- F&mdash /
- F事件 /
- 晚泥盆世
Abstract: Carbon isotopic records from Europe, America, African, and Australia show two δ¹³ C positive excursions in the upper Devonian, which occur in the late rhenana and F F boundary, respectively. However, the pattern of δ¹³ C variations from southern China has not well been constrained. The negative δ¹³ C excursion was found in the early studies; however, the detailed study in the Dongcun section shows two δ¹³ C positive excursions in the upper Devonian. So further research is needed. The carbonate samples taken from Yandi section in Guilin, southern China have been analyzed for carbon isotopic and elemental compositions. The result shows two δ¹³ C positive excursions in the Upper Devonian. The first excursion occurred in the early rehnana zone, and the second around F F boundary, the later is a worldwide pattern. Compared with other records from different paleogeography units in the world, the F F carbon isotope excursion occurred in transition sequences has comparable shapes and amplitudes and,further support that they must be the result of a global increase in burial organic carbon.
- &delta /
- ¹³ C /
- positive excursion /
- F-F event

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参考文献(27)

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广西上泥盆统F—F界线碳同位素的变化特征

作者简介:
许冰男 1969年出生博士助理研究员环境地球化学

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The Pattern of Variations in Carbon Isotope of the Frasnian-Famennian Limestone Sequences in Guangxi, Southern China

计量

目录

广西上泥盆统F—F界线碳同位素的变化特征

1. 中国科学院地质与地球物理研究所北京 100029;

2. 广西区域地质调查研究院广西桂林 541003

作者简介:
许冰男 1969年出生博士助理研究员环境地球化学

English Abstract

The Pattern of Variations in Carbon Isotope of the Frasnian-Famennian Limestone Sequences in Guangxi, Southern China

1. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029;

2. Guangxi Institute of Regional Geology Survey, Guilin Guangxi 541003

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广西上泥盆统F—F界线碳同位素的变化特征

作者简介: 许冰 男 1969年出生 博士 助理研究员 环境地球化学

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The Pattern of Variations in Carbon Isotope of the Frasnian-Famennian Limestone Sequences in Guangxi, Southern China

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出版历程

目录

广西上泥盆统F—F界线碳同位素的变化特征

1. 中国科学院地质与地球物理研究所 北京 100029; 2. 广西区域地质调查研究院 广西桂林 541003

作者简介: 许冰 男 1969年出生 博士 助理研究员 环境地球化学

English Abstract

The Pattern of Variations in Carbon Isotope of the Frasnian-Famennian Limestone Sequences in Guangxi, Southern China

1. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029; 2. Guangxi Institute of Regional Geology Survey, Guilin Guangxi 541003

全文HTML

目录

友情链接

期刊在线

联系我们

作者简介:
许冰男 1969年出生博士助理研究员环境地球化学

1. 中国科学院地质与地球物理研究所北京 100029;

2. 广西区域地质调查研究院广西桂林 541003

作者简介:
许冰男 1969年出生博士助理研究员环境地球化学

1. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029;

2. Guangxi Institute of Regional Geology Survey, Guilin Guangxi 541003