干旱区生态环境知识资源中心(Arid): Origin and formation model of Eocene dolomite in the upper Niubao Formation of the Lunpola Basin, Tibetan Plateau

Arid

DOI	10.1190/INT-2020-0195.1
	Origin and formation model of Eocene dolomite in the upper Niubao Formation of the Lunpola Basin, Tibetan Plateau
	Chen, Xiaoquan; Xing, Fengcun; Jiang, Shu; Lu, Yongchao; Liu, Zhongrong; Pan, Lei; Hu, Huarui
通讯作者	Xing, FC (corresponding author), Chengdu Univ Technol, State Key Lab Oil & Gas Reservoir Geol & Exploita, Chengdu 610059, Peoples R China. ; Xing, FC (corresponding author), Chengdu Univ Technol, Inst Sedimentary Geol, Chengdu 610059, Peoples R China.
来源期刊	INTERPRETATION-A JOURNAL OF SUBSURFACE CHARACTERIZATION
ISSN	2324-8858
EISSN	2324-8866
出版年	2021
卷号	9 期号:3 页码:SF11-SF22
英文摘要	Using fresh core samples, we have determined the origin and formation process of Eocene lacustrine dolomites in the Tibetan Plateau through petrological, mineralogical, and geochemical analyses. Dolomitic rocks were collected from the upper member of the Eocene Niubao Formation in the Lunpola Basin, consisting of dolomitic mudstone, argillaceous dolomite, dolomite-bearing mudstone, and mud-bearing dolomite. These dolomites are dominated by aphanotopic and microcrystalline dolomites, with minor amounts of euhedral or subhedral powder- and fine-crystalline dolomites. Carbon and oxygen stable isotopes, combined with ubiquitous gypsum in study area, indicate a semisaline continental lake under strong evaporative conditions. The revealed relatively high temperature of the dolomitization (33.8 degrees C-119.1 degrees C), combined with hydrothermal minerals such as cerous phosphate and barite, reflect the participation of dolomite from hot fluids. Moreover, the inferred dolomitization temperatures decrease gradually toward the center of the lake basin, suggesting the resurgence of hydrothermal fluids along a fault zone on the lake margin. This proves that frequent thermal events occurred at the boundary fault of the Lunpola Basin margin during early Himalayan orogenesis. In addition, Jurassic carbonates interacting with hydrothermal fluids, as well as strong evaporation conditions, likely provided favorable conditions for the formation of primary lime sediments. A rich source of Mg2thorn brought by volcanic ash, hydrothermal fluids, and the Jurassic carbonates then created conditions for dolomitization during the depositional period. Strong evaporation under a relatively hot climate enhanced penecontemporaneous dolomitization, thus forming dolomite. Tibetan Plateau was under arid to semiarid climate conditions, and there was a widespread distribution of dolostones in western, central, and northern China during the Eocene period. The hydrothermal dolomites of the upper Niubao Formation testify for active hot springs, whereas lacustrine dolomite imply arid or semiarid climates during the Eocene, in the early stages of Himalayan orogenesis.
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000699850500007
WOS关键词	SULFATE-REDUCING BACTERIA ; LACUSTRINE CARBONATES ; MICROBIAL MEDIATION ; COORONG REGION ; LAKE ; DOLOMITIZATION ; PRECIPITATION ; HOLOCENE ; PALEOELEVATION ; TRANSITION
WOS类目	Geochemistry & Geophysics
WOS研究方向	Geochemistry & Geophysics
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/363674
作者单位	[Chen, Xiaoquan; Xing, Fengcun] Chengdu Univ Technol, State Key Lab Oil & Gas Reservoir Geol & Exploita, Chengdu 610059, Peoples R China; [Chen, Xiaoquan; Xing, Fengcun; Hu, Huarui] Chengdu Univ Technol, Inst Sedimentary Geol, Chengdu 610059, Peoples R China; [Jiang, Shu] Minist Educ, Key Lab Tecton & Petr Resources, Wuhan 430074, Peoples R China; [Jiang, Shu] Key Lab Theory & Technol Petr Explorat & Dev Hube, Wuhan 430074, Peoples R China; [Jiang, Shu] China Univ Geosci Wuhan, Sch Earth Resources, Wuhan 430074, Peoples R China; [Lu, Yongchao] China Univ Geosci Wuhan, Key Lab Tecton & Petr Resources, Minist Educ, Wuhan 430074, Peoples R China; [Lu, Yongchao] China Univ Geosci Wuhan, Fac Earth Resources, Wuhan 430074, Peoples R China; [Liu, Zhongrong; Pan, Lei] SINOPEC, Southern Explorat Branch, Chengdu 610041, Peoples R China
推荐引用方式 GB/T 7714	Chen, Xiaoquan,Xing, Fengcun,Jiang, Shu,et al. Origin and formation model of Eocene dolomite in the upper Niubao Formation of the Lunpola Basin, Tibetan Plateau[J],2021,9(3):SF11-SF22.
APA	Chen, Xiaoquan.,Xing, Fengcun.,Jiang, Shu.,Lu, Yongchao.,Liu, Zhongrong.,...&Hu, Huarui.(2021).Origin and formation model of Eocene dolomite in the upper Niubao Formation of the Lunpola Basin, Tibetan Plateau.INTERPRETATION-A JOURNAL OF SUBSURFACE CHARACTERIZATION,9(3),SF11-SF22.
MLA	Chen, Xiaoquan,et al."Origin and formation model of Eocene dolomite in the upper Niubao Formation of the Lunpola Basin, Tibetan Plateau".INTERPRETATION-A JOURNAL OF SUBSURFACE CHARACTERIZATION 9.3(2021):SF11-SF22.