四川盆地及周缘震旦系灯影组岩性—碳同位素地层划分及意义<sup>*</sup>

doi:10.7605/gdlxb.2023.06.050

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Abstract

The division of the Dengying Formation is controversial due to great variation in its stratigraphic thicness. Moreover,the formation mechanism of the Mianyang-Changning intracratonic sag is poorly understood due to the controversy in stratigraphic division. Based on investigations of two outcrop sections and three drilling wells,this paper conducted a systematic lithol and carbon isotopic δ¹³C stratigraphic division and correlation of the Dengying Formation,and divided it into six isochronous lithologic units with three positive(DP1,DP2,DP3)and three negative(DN1,DN2,DN3)carbon isotopic excursions: (1)The Member 1 of Dengying Formation is marked by dolomudstone;(2)the lower submember of Member 2 of Dengying Formation consists of various microbial dolomite with grape-like structures,showing DP1 in its lower part,and DN1 in its middle part,which passes upward into DP2 gradually;(3)the upper submember of Member 2 of Dengying Formation is marked by dolomudstone and minor microbial dolomite,locally with mixed carbonate and siliciclastic sedimentation,showing DP2 in its lower part and DN2 in its middle-upper part;(4)the Member 3 of Dengying Formation is typical of mixed carbonate and siliciclastic sedimentation,locally solely with siliciclastic rocks,containing characteristic tubular fossils;(5)the lower submember of Member 4 of Dengying Formation is composed of thick dolomudstone with δ¹³C around 1‰in the lower part and positively shifting into DP3 upward;(6)the upper submember of Member 4 of Dengying Formation consists mainly of microbial dolomite,exhibiting DP3 in the base with a negative shift trend towards the Ediacaran-Cambrian boundary as DN3. The unconformities above the upper submember of Member 2 of Dengying Formation and Member 4 of Dengying Formation can be correlated with the glaciations during 547 Ma and Ediacaran-Cambrian boundary,respectively. The missing of the strata above the lower submember of Member 2 of Dengying Formation of varying degree is identified in the Wells Pengtan 1 and Pengshen 3 in the Mianyang-Changning intracratonic sag. The strata missing of the Dengying Formation in the Mianyang-Changning intracratonic sag up to 600 m(to the basal Lower submember of Member 2 of Dengying Formation), and the largest thickness of the overlying Maidiping Formation and the most complete strata there,collectively suggest that the majority of Mianyang-Changning intracratonic sag of the Dengying Formation formed after the deposition of the basal lower submember of Member 2 of Dengying Formation and before the deposition of the Maidiping Formation.

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	Articles by authors
	CHEN Mingsi
	ZHANG Benjian
	LI Zhiwu
	LIU Shugen
	LI Yong
	SONG Jinmin
	WANG Han
	JIANG Hang
	WANG Linkang
	XU Shaoli
	DING Yi

Key words： Sichuan Basin Dengying Formation carbon isotope stratigraphic division and correlation Mianyang-Changning intracratonic sag

Received: 29 November 2022

ZTFLH:

P521

Fund:

National Natural Science Foundation of China(Nos. 41902105,U19B6003)

Corresponding Authors: LI Zhiwu,born in 1976,a professor and Ph.D. advisor of Chengdu University of Technology,is mainly engaged in structural geology and petroleum geology. E-mail: lizhiwu06@mail.cdut.edu.cn. DING Yi,born in 1987,a professor of Chengdu University of Technology,is mainly engaged in carbonate sedimentology and sedimentary geochemistry. E-mail: Dingyi@cdut.edu.cn.

About author: CHEN Mingsi,born in 1997,a master degree candidate of Chengdu University of Technology, is engaged in research on geology. E-mail: 1369635589@qq.com.

Cite this article:

CHEN Mingsi,ZHANG Benjian,LI Zhiwu et al. Lithol and carbon isotopic stratigraphic division and its sighificance of the Sinian Dengying Formation in Sichuan Basin and surrounding area[J]. JOPC, 2023, 25(6): 1347-1363.

URL:

http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2023.06.050 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2023/V25/I6/1347

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