|本期目录/Table of Contents|

[1]李荣西,魏家庸,肖家飞,等.海进体系域碳氧同位素地球化学响应 ———以黔西南地区三叠系为例[J].地球科学与环境学报,2007,29(01):1-5,21.
　LI Rong-xi,WEI Jia-yong,XIAO Jia-fei,et al.Response of Carbon and Oxygen Isotopic Geochemistry to Transgressive Systems Tract :An Example From Triassic Stratigraphy in Southwestern Guizhou Province[J].Journal of Earth Sciences and Environment,2007,29(01):1-5,21.
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海进体系域碳氧同位素地球化学响应 ———以黔西南地区三叠系为例(PDF)
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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:
第29卷
期数:
2007年第01期
页码:
1-5,21
栏目:
出版日期:
2007-03-15

文章信息/Info

Title:
Response of Carbon and Oxygen Isotopic Geochemistry to Transgressive Systems Tract :An Example From Triassic Stratigraphy in Southwestern Guizhou Province
作者:
李荣西1; 魏家庸1; 肖家飞2; 王兴理2; Lehrmann D J3
1.长安大学地球科学与国土资源学院,陕西西安710054;2.中国科学院地球化学研究所, 贵州贵阳550002;3.威斯康星大学奥什科什分校地质系,奥什科什,WI54901,美国
Author(s):
LI Rong-xi1; WEI Jia-yong1; XIAO Jia-fei2; WANG Xing-li2; Leh rmann D J3
1. School of Earth Sciences and Resources Management, Chang’ an University, Xi’an 710054, Shaanxi, China; 2. Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, Guizhou, China; 3. Department of Geology, University of Wisconsin-Oshkosh, Oshkosh WI 54901, USA
关键词:
碳同位素; 氧同位素; 层序地层; 三叠系; 黔西南
Keywords:
Carbon isotope;  Oxygen isotope;  transgressive systems tract(TST);  Triassic Period;  Southwest area of Guizhou Province
分类号:
P588.2
DOI:
-
文献标志码:
A
摘要:
层序地层研究表明,位于扬子地块西南缘的黔西南地区在中三叠世末期(相当于Ladinian-Carnian期)出 现了一次与全球同步的大规模海侵,形成了一个向上变深的碳酸盐岩台地淹没沉积层序。垄头组顶部和竹竿坡 组分别是海进体系域(TST)的下、上部分。碳、氧同位素研究表明,垄头组顶部自下而上δ(18O)持续增大,而 δ(13C)先逐渐增大,后在顶部界面附近快速下降,反映了垄头组顶部在暴露环境下氧化作用的结果。竹竿坡组 δ(13C)自下而上逐渐增大,δ(18O)总体呈现逐渐减小趋势,反映了海平面变化特征。研究认为,海进体系域的 δ(13C)和δ(18O)演化不但反映了海平面和沉积环境变化,同时对密集段(CS)、层序界面和古暴露面等也有很好 的识别作用,在层序地层研究中具有重要的意义。
Abstract:
There was a large regression of sea-level in the Later Middle Triassic in Yangtze Block(the famous Ladinia large regression in China). But a large transgression of sea-level took place synchronously with the global sea-level changes in the southwest corner of Yangtze Block at the southwest region of Guizhou Province during the same period. The Yangtze carbonate platform was drawn and a transgressive sequence was formed during that time. The transgressive systems tract(TST) comprised the top section of Longtou Formation and Zhuganpo Formation. Studies to the variations ofδ(13C)andδ(18O)of the TST show that theδ(18O)of Longtou Formation increased upward while theδ(13C)increased in lower part but decreased abruptly at the top, which reflects the diagenetic alteration to the top of Longtou Formation due to exposure under continental weathering environment. Theδ(13 C)increasing significantly while theδ(18 O) decreasing gradually upward within Zhuganpo Formation indicates a major sea-level rise. The δ(13 C) and δ(18 O) values of TST reflect sea level fluctuation and paleoenvironment changes. The condensed section(CS)and the strata boundary can be reflected with carbon and oxygen isotopic composition.

参考文献/References:

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备注/Memo

备注/Memo:
收稿日期:2006-03-12 基金项目:国家自然科学基金项目(40173005) 作者简介:李荣西(1966-),男,甘肃庆阳人,副教授,从事油气勘探与地球化学研究。E-mail:rongxli@chd.edu.Cn
更新日期/Last Update: 1900-01-01