气候变化领域集成服务门户(CCPortal): Response of Paleogene Fine-Grained Clastic Rock Deposits in the South Qiangtang Basin to Environments and Thermal Events on the Qinghai-Tibet Plateau

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DOI	10.1021/acsomega.3c03144
	Response of Paleogene Fine-Grained Clastic Rock Deposits in the South Qiangtang Basin to Environments and Thermal Events on the Qinghai-Tibet Plateau
	Zhang, Zhibo; Li, Huan; Zheng, Weiqing; Whattam, Scott A.; Zhu, Zhijun; Jiang, Weicheng; Zhao, Difei
发表日期	2023
ISSN	2470-1343
起始页码	26458
结束页码	26478
卷号	8 期号:29
英文摘要	The Chamdo Basin is a secondary basin in the easternpart of TibetChina and is one of the most promising of petroliferous basins fornew petroleum exploration. The Qamdo Basin records a complex burialhistory from the Mesozoic to the Cenozoic; however, the poorly constrainedsedimentology of Cenozoic strata in this basin has severely obscuredthe overall profile and impeded further explorations of oil and gasresources. Here, we conduct whole-rock geochemical analyses of major,trace, and rare earth elements in fine-grained clastic rocks of thePaleocene Gongjue Formation, Qamdo Basin to reveal depositional environments,provenance, and tectonic setting. Petrologically, the Gongjue Formationis dominated by red fine-grained sandy mudstones/siltstones with ripplemarks. The high values of the chemical index of alteration (avg. of78.93), chemical index of weathering (avg. of 90.10), and index ofcompositional variability (avg. of 2.5) suggest that the basin hasundergone heavy weathering. Cross-plots of La vs Th, Th vs Sc vs Zr/10,and Th vs Co vs Zr/10 reveal a continental arc tectonic setting. Paleosalinity(Sr/Ba), paleoclimate (Sr/Cu), and redox proxies (V/Cr, U/Th, andenrichment factors of Mo and U) indicate brackish to saline and oxidizingpaleowater masses during deposition of the Gongjue Formation. Provenanceanalyses via elements and petrology reveal that sediments in the GongjueFormation are mainly derived from intermediate-acidic rocksof the upper crust. We conclude that the first and third members aremore arid climate and heavily chemically weathered than the secondmember. In combination with previous studies of the structural evolutionof the Qamdo Basin since the Paleogene, a model is built to describethe sedimentary environment and evolution of the Qamdo Basin duringtransition to the Paleocene. The first and third members, i.e., theEg(1) and Eg(3) members of the Gongjue Formation,are dominated by an oxidizing environment of seawater-saltwater, andthe climate ranges from warm and humid to arid and hot, with relativelystable environmental changes. The Eg(2) member of the GongjueFormation is dominated by an oxidizing environment of seawater-saltwater,and the climate ranges from warm and humid to arid and hot, with morefrequent environmental evolution. Our model aids in better understandingof the Paleocene climate evolution of the eastern Tibetan Plateau.
英文关键词	ORGANIC-MATTER; TECTONIC EVOLUTION; CHINA IMPLICATIONS; SEDIMENTARY-ROCKS; MARINE-SEDIMENTS; OROGENIC BELT; LANPING BASIN; PROVENANCE; GEOCHEMISTRY; MOLYBDENUM
WOS研究方向	Chemistry, Multidisciplinary
WOS记录号	WOS:001026981300001
来源期刊	ACS OMEGA
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283544
作者单位	China University of Mining & Technology; Central South University; King Fahd University of Petroleum & Minerals; East China University of Technology; Macquarie University
推荐引用方式 GB/T 7714	Zhang, Zhibo,Li, Huan,Zheng, Weiqing,et al. Response of Paleogene Fine-Grained Clastic Rock Deposits in the South Qiangtang Basin to Environments and Thermal Events on the Qinghai-Tibet Plateau[J],2023,8(29).
APA	Zhang, Zhibo.,Li, Huan.,Zheng, Weiqing.,Whattam, Scott A..,Zhu, Zhijun.,...&Zhao, Difei.(2023).Response of Paleogene Fine-Grained Clastic Rock Deposits in the South Qiangtang Basin to Environments and Thermal Events on the Qinghai-Tibet Plateau.ACS OMEGA,8(29).
MLA	Zhang, Zhibo,et al."Response of Paleogene Fine-Grained Clastic Rock Deposits in the South Qiangtang Basin to Environments and Thermal Events on the Qinghai-Tibet Plateau".ACS OMEGA 8.29(2023).