四川盆地宣汉渡口和重庆北碚下三叠统海相碳酸盐碳同位素组成与演化

doi:10.7605/gdlxb.2016.01.008

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Abstract

The Early Triassic,as an interval following the mass extinction at the Permo-Triassic boundary,representing the ecosystem reconstruction and recovery after the end-Permian biotic crisis,has been garnered much attention in the geological fields. In order to approach carbon isotopic composition and evolution of Early Triassic seawater,we examined the δ¹³C value of 258 carbonate samples from the Early Triassic(including adjacent strata)from Dukou section in Xuanhan County and Beibei section in Chongqing City,Sichuan Basin. Most of the samples preserve the initial carbon isotopic composition of seawater,but the original signal in the second and fourth Members of Jialingjiang Formation is much more poorly preserved than that of Feixianguan Formation and first and third Members of Jialingjiang Formation. Based on the principle that the oxygen isotope is more sensitive to alternation during the diagenetic process,the relationship between δ¹³C and δ¹⁸O was analyzed,and 200 samples with the δ¹⁸O <-7.5‰ were selected to construct the carbon isotopic evolution curve of the Early Triassic. This isotopic evolution curve shows finely comparable patterns with the coeval curve originating from Guizhou Province. The curve presents larger fluctuations in δ¹³C value of Early Triassic seawater. There are two complete ascending and descending cycles. The cycle 1 consists of Feixianguan Formation,and the first Member of Jialingjiang Formation;while the cycle 2 consists of the second and third Members and part of the fourth Member of Jialingjiang Formation,as well as several sub-cycles. According to the pattern of the curve,the lithostratigraphic unit is correlated with chronostratigraphic unit from the coeval curve of Guizhou Province originating from literatures,and further shows that the Feixianguan Formation is in accordance with the Induan Stage,the first Member of Jialingjiang Formation is corresponding to the Smithian substage,the second and third Members and part of the fourth Member of Jialingjiang Formation would be correlated to Spathian substage. Thus,the green-bean rock,as the boundary of Middle and Lower Triassic,is probably distributed in the Middle Triassic. The fluctuations of Early Triassic carbon isotopic curve,both in frequency and amplitude,would result from the perturbations of ecologic environments. The thriving of bacteria and algae in ocean ecosystems results in high burial efficiency of organic carbon and positive excursion of δ¹³C value. The negative excursion of δ¹³C might be the consequences of the hydrates methane release. The carbon isotopic evolution shows the tendency of commonly higher δ¹³C value in dolomite beds than in limestone beds,suggesting the interrelation among activity of microorganism,formation of dolomite and elevation of δ¹³C of seawater. The formation of dolomites in the Early Triassic,especially in the second Member of Jialingjiang Formation,might be originated from activity of microorganism,also as the main source for organic carbon burial. The hydrocarbon in dolomites of the second Member of Jialingjiang Formation is characterized by “in situ reservoir” to some degrees.

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	Huang Keke
	Huang Sijing
	Hu Zuowei
	Zhong Yijiang
	Li Xiaoning

Key words： State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Institute of Sedimentary Geology Chengdu University of Technology Chengdu 610059 Sichuan

Received: 23 April 2015 Published: 01 February 2016

ZTFLH:

P588.2

Fund:

Financially supported by the National Natural Science Foundation Project(No.41272130)

Cite this article:

Huang Keke,Huang Sijing,Hu Zuowei et al. Carbon isotopic composition and evolution of the Lower Triassic marine carbonates from Dukou of Xuanhan and Beibei of Chongqing[J]. JOPC, 2016, 18(1): 101-114.

URL:

http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2016.01.008 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2016/V18/I1/101

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