干旱区生态环境知识资源中心(Arid): Geochemistry and geochronology characteristics and their geological significance of microbial dolomite in Upper Sinian, NW Tarim Basin

Arid

DOI	10.18654/1000-0569/2021.07.13
	Geochemistry and geochronology characteristics and their geological significance of microbial dolomite in Upper Sinian, NW Tarim Basin
	Zheng JianFeng; Shen AnJiang; Yang HanXuan; Zhu YongJing; Liang Feng
通讯作者	Zheng, JF (corresponding author), PetroChina Hangzhou Res Inst Geol, Hangzhou 310023, Peoples R China. ; Zheng, JF (corresponding author), CNPC, Key Lab Carbonate Reservoirs, Hangzhou 310023, Peoples R China.
来源期刊	ACTA PETROLOGICA SINICA
ISSN	1000-0569
EISSN	2095-8927
出版年	2021
卷号	37 期号:7 页码:2189-2202
英文摘要	Upper Sinian Qigeblak Formation microbial dolomite is an important potential exploration field of Cambrian pre-salt ultra deep strata in Tarim Basin, NW China. Based on detailed geological observation, 175 thin sections identification, multi-parameters geochemical data analysis ( order degree, trace elements, REEs, carbon -oxygen and strontium isotope) and 14 samples' LA-MC-ICP-MS U-Pb dating on the Xigou profile in Aksu area ( NW Tarim Basin), it was found that: (1) stromatolite dolomite, thrombolite dolomite, foamy microbial dolomite, oolite dolomite and grain dolomite with microbial bonding structure are the main lithofacies of the Qigeblak Formation; the characteristics of lithofacies assemblage from bottom to up indicate that the sediment sequence is from inner ramp tidal flat to inner ramp microbial mound/shoal; (2) the Z value and T value calculated from the carbon and oxygen isotopes indicate that the ancient seawater had high salinity and relatively warm temperature; (3) high Sr content and low V, Ni, Ba, Co content indicate relatively arid climatic background, while low Sigma REE, Mo, Cu, Co, Ba content and relatively high Pb content and (875)r/S-86 values indicate the sea water depth is shallow, i. e., Aksu area is close to the paleo-land; relatively low V/(V + Ni) values, weak Ce negative anomaly and low Cu and Zn contents indicate the characteristics of weakly oxidized seawater; (4) the U-Pb isotop ages of the 5 microbial dolomite samples and 9 carbonate cements, and delta C-13 and delta(18)Ocharacteristics comprehensively indicated that the pores in the microbe dolomite were mainly primary pores and penecontemporaneous pores; some pores underwent karstification at the end of Sinian Period and cementation in Yanshanian Period. These research results are of great significance to the lithofacies paleogeography mapping and reservoir genesis analysis of Cambrian pre-salt ultra-deep field.
英文关键词	Geochemistry Geochronology Geological significance Microbial dolomite Upper Sinian Tarim Basin
类型	Article
语种	中文
收录类别	SCI-E
WOS记录号	WOS:000692099800013
WOS关键词	CARBONATES ; DISCOVERY ; RESERVOIR
WOS类目	Geology
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/368045
作者单位	[Zheng JianFeng; Shen AnJiang; Zhu YongJing; Liang Feng] PetroChina Hangzhou Res Inst Geol, Hangzhou 310023, Peoples R China; [Zheng JianFeng; Shen AnJiang; Yang HanXuan; Zhu YongJing; Liang Feng] CNPC, Key Lab Carbonate Reservoirs, Hangzhou 310023, Peoples R China; [Yang HanXuan] Southwest Oil & Gas Field Co, PetroChina, Shunan Gasfield, Luzhou 646000, Peoples R China
推荐引用方式 GB/T 7714	Zheng JianFeng,Shen AnJiang,Yang HanXuan,et al. Geochemistry and geochronology characteristics and their geological significance of microbial dolomite in Upper Sinian, NW Tarim Basin[J],2021,37(7):2189-2202.
APA	Zheng JianFeng,Shen AnJiang,Yang HanXuan,Zhu YongJing,&Liang Feng.(2021).Geochemistry and geochronology characteristics and their geological significance of microbial dolomite in Upper Sinian, NW Tarim Basin.ACTA PETROLOGICA SINICA,37(7),2189-2202.
MLA	Zheng JianFeng,et al."Geochemistry and geochronology characteristics and their geological significance of microbial dolomite in Upper Sinian, NW Tarim Basin".ACTA PETROLOGICA SINICA 37.7(2021):2189-2202.