川东北地区长兴组-飞仙关组碳酸盐岩同位素地球化学响应及其地质意义

doi:10.11743/ogg20210606

Abstract

Abstract:

The carbon and oxygen isotopes are important geochemical indexes for the study of carbonate rocks and have been widely used in revealing global climate changes and sea level fluctuation as well as diagenesis and stratigraphic correlations. This study starts with outcrop observation, thin-section identification and trace element analysis, continues with establishing isotope evolution curves with emphasis on the regional comparative analysis of the geochemical response characteristics of carbon and oxygen isotopes based on analyses of carbon and oxygen isotope compositions of 241 carbonate samples from the Changxing-Feixianguan Formations in northeastern Sichuan Basin, and ends with a discussion on the geological significance of these characteristics. The results show that the carbon isotope evolution curves positively correlate with sea level changes in the Changxing period and correspond well with the system tracts in the sequence. The oxygen isotope composition shows a relatively stable trend during this period. Strong negative drift of carbon and oxygen isotope values occurs near the Permian/Triassic boundary while reaching their lowest values. After entering the Feixianguan period, the carbon isotope value keeps rising with a low-amplitude fluctuation until reaching the maximum value inside the fourth member of Feixianguan Formation. The oxygen isotope composition is stable during the Feixianguan period. It is also suggested that the strong negative drift of carbon and oxygen isotopes at the Permian/Triassic boundary may be closely related to methane release and volcanic eruption events.

Key words: isotope geochemical characteristic, carbonate rock, Changxing Formation, Feixianguan Formation, northeastern Sichuan Basin, Sichuan Basin

CLC Number:

TE121.3

Qingmin Dong, Zhonggui Hu, Shiyue Chen, Shilin Li, Jialan Cai, Yixin Zhu, Yuying Zhang. Isotope geochemical responses and their geological significance of Changxing-Feixianguan Formation carbonates, northeastern Sichuan Basin[J]. Oil & Gas Geology, 2021, 42(6): 1307-1320.

Figures/Tables 10

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研究剖面	层位	样品总数/个	δ¹⁸O < -10 ‰		Mn/Sr < 2
研究剖面	层位	样品总数/个	剔除样品数/个	剔除率/%	剔除样品数/个	剔除率/%
盘龙洞	长兴组	51	0	0	5	9.80
渡口	长兴组	33	0	0	3	9.10
渡口	飞仙关组	38	0	0	3	7.90
羊鼓洞	长兴组	30	0	0	3	10.00
羊鼓洞	飞仙关组	30	7	23.30	6	20.00
云阳沙市	长兴组	18	0	0	1	5.60
云阳沙市	飞仙关组	41	0	0	3	7.30
长兴组剔除率/%		4.98
飞仙关组剔除率/%		6.22

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Isotope geochemical responses and their geological significance of Changxing-Feixianguan Formation carbonates, northeastern Sichuan Basin

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