干旱区生态环境知识资源中心(Arid): Elemental geochemistry of the Middle Jurassic shales in the northern Qaidam Basin, northwestern China: Constraints for tectonics and paleoclimate

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DOI	10.1515/geo-2020-0318
	Elemental geochemistry of the Middle Jurassic shales in the northern Qaidam Basin, northwestern China: Constraints for tectonics and paleoclimate
	Hou, Haihai; Liu, Shujun; Shao, Longyi; Li, Yonghong; Zhao, Ming'en; Wang, Cui
通讯作者	Hou, HH (corresponding author), Liaoning Tech Univ, Coll Min, Fuxing 123000, Peoples R China. ; Shao, LY (corresponding author), China Univ Min & Technol, Coll Geosci & Surveying Engn, Beijing 100083, Peoples R China.
来源期刊	OPEN GEOSCIENCES
ISSN	2391-5447
出版年	2021
卷号	13 期号:1 页码:1448-1462
英文摘要	The elemental geochemical characteristics of mudstones/shales are good tracers for indicating the evolution of tectonics, paleoenvironment, and paleoclimate. Based on the continuous sampling of drilling cores from the Middle Jurassic Dameigou and Shimengou Formations in the northern Qaidam Basin, the major, trace, and rare earth elements of the 31 mudstones and shales were analyzed. The information on the evolution of tectonics, provenance, and paleoclimate during Middle Jurassic was also recovered. The results show that: (1) A couple of elements consisting of Sc, Y, V, Cr, Co, Ni, Cu, Zn, Th, and U are relatively enriched, indicating that the contents of siderophile and chalcophile elements are significantly high in the Middle Jurassic samples; (2) Changes in the chemical index of alteration, Ga/Rb, and K2O/Al2O3 ratios in the mudstone/shale samples suggest that the paleoclimate was changed from warm and humid in the early stage to cold and dry in the middle stage and to hot and arid in the late stage; (3) The Middle Jurassic provenance of the northern Qaidam Basin was predicted from upper crust and felsic rocks to the mixed felsic rocks and basic rocks; (4) The Middle Jurassic tectonic background was changed from passive continental margin to active continental margin and oceanic island arc. The paleoclimatic and paleogeographic evolution of northern Qaidam Basin were closely related to the surrounding paleo-oceanic and ancient plate activities. In the early stage of the Middle Jurassic, the extensional activity in the passive continental margin and the water vapor input was caused by the Tethys Ocean, resulting in a warm and humid paleoclimate. In the late stage of the Middle Jurassic, the tectonic background of the study area tended to be an oceanic island arc caused by compressive tectonic, which blocked the monsoon input and led to a hot and arid paleoclimate. The establishment of multiple geochemical profiles can provide a scientific basis for the climate changes in greenhouse-icehouses and source-sink systems of the Middle Jurassic in northwestern China.
英文关键词	northern Qaidam Basin middle Jurassic element geochemistry weathering paleoclimate
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000723689800001
WOS关键词	RARE-EARTH-ELEMENTS ; WEATHERING TRENDS ; YUQIA COALFIELD ; PROVENANCE ; TRACE ; COAL ; ACCUMULATION ; PETROGRAPHY ; SANDSTONES ; SILTSTONES
WOS类目	Geosciences, Multidisciplinary
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/2XILL650/373891
作者单位	[Hou, Haihai; Liu, Shujun; Zhao, Ming'en; Wang, Cui] Liaoning Tech Univ, Coll Min, Fuxing 123000, Peoples R China; [Shao, Longyi] China Univ Min & Technol, Coll Geosci & Surveying Engn, Beijing 100083, Peoples R China; [Li, Yonghong] Qinghai Bur Coal Geol Explorat, 105 Explorat Team, Xining 810007, Peoples R China
推荐引用方式 GB/T 7714	Hou, Haihai,Liu, Shujun,Shao, Longyi,et al. Elemental geochemistry of the Middle Jurassic shales in the northern Qaidam Basin, northwestern China: Constraints for tectonics and paleoclimate[J],2021,13(1):1448-1462.
APA	Hou, Haihai,Liu, Shujun,Shao, Longyi,Li, Yonghong,Zhao, Ming'en,&Wang, Cui.(2021).Elemental geochemistry of the Middle Jurassic shales in the northern Qaidam Basin, northwestern China: Constraints for tectonics and paleoclimate.OPEN GEOSCIENCES,13(1),1448-1462.
MLA	Hou, Haihai,et al."Elemental geochemistry of the Middle Jurassic shales in the northern Qaidam Basin, northwestern China: Constraints for tectonics and paleoclimate".OPEN GEOSCIENCES 13.1(2021):1448-1462.