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Response of Carbon and Oxygen Isotopic Geochemistry to Transgressive Systems Tract :An Example From Triassic Stratigraphy in Southwestern Guizhou Province(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2007年第01期
Page:
1-5,21
Research Field:
Publishing date:

Info

Title:
Response of Carbon and Oxygen Isotopic Geochemistry to Transgressive Systems Tract :An Example From Triassic Stratigraphy in Southwestern Guizhou Province
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
Keywords:
Carbon isotope;  Oxygen isotope;  transgressive systems tract(TST);  Triassic Period;  Southwest area of Guizhou Province
PACS:
P588.2
DOI:
-
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.

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