气候变化领域集成服务门户(CCPortal): Cenozoic architecture and structural development of the eastern Qaidam basin

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DOI	10.6038/cjg20161218
	Cenozoic architecture and structural development of the eastern Qaidam basin
	Du, Zhong-Ming; Fan, Long-Gang; Wu, Guo-Li; Wei, Hong-Hong; Meng, Qing-Ren
通讯作者	Du, ZM (通讯作者)
发表日期	2016
ISSN	0001-5733
起始页码	4560
结束页码	4569
卷号	59 期号:12
英文摘要	This study aims to reveal Cenozoic architecture and structural development of the eastern Qaidam basin. Seismic profiles show that Cenozoic strata become thinner and pinch out toward the northern and southern edges of the basin, and the northern basin has been greatly modified by the Oulongbulukshan and Aimunikshan uplifts. Based on the analysis of lateral variations of Cenozoic strata and stratigraphic sections, it is demonstrated that the Oubei fault initiated in the Late Miocene, leading to rising of the Oulongbulukshan uplift and formation of the Delingha depression. The Aibei fault became active in the Pliocene, and north-directed thrusting of both the Aibei and Oubei faults resulted in further subsidence of the Delingha depression and deposition of the Shizigou Formation up to 2600 m thick. The Quaternary witnessed large-scale thrusting of the Ai'nan fault, which not only caused uplifting and southerly displacement of the Oulongbuluk mountain and Aimunik mountain on the north but also the generation of the Hobuxun depression on the south. The Hobuxun depression then became the depocenter of the eastern Qaidam basin. Previous basin models, such as foreland basin or piggyback basin models, apparently failed to interpret both the Cenozoic architecture and structural development of the eastern Qaidam basin. It is proposed that the eastern Qaidam basin was formed as a result of crustal folding related to strong horizontal compression, i.e., the eastern Qaidam basin was a crustal-scale synclinal basin. The synclinal basin model can well account for the thinning of strata toward basin margins and localization of depocenters in the middle of the basin during the Cenozoic. Reconstruction of structural evolution of the eastern Qaidam basin will help understand lateral growth of the northeastern Tibetan plateau.
关键词	APATITE FISSION-TRACK TIBETAN PLATEAU QILIAN SHAN TECTONIC EVOLUTION HEXI CORRIDOR QINGHAI CHINA STRATIGRAPHY PROVINCE HISTORY
英文关键词	Qaidam basin; Cenozoic; Seismic profiles; Sedimentary basin; Tibetan plateau
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000389683800018
来源期刊	CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258678
推荐引用方式 GB/T 7714	Du, Zhong-Ming,Fan, Long-Gang,Wu, Guo-Li,et al. Cenozoic architecture and structural development of the eastern Qaidam basin[J]. 中国科学院青藏高原研究所,2016,59(12).
APA	Du, Zhong-Ming,Fan, Long-Gang,Wu, Guo-Li,Wei, Hong-Hong,&Meng, Qing-Ren.(2016).Cenozoic architecture and structural development of the eastern Qaidam basin.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,59(12).
MLA	Du, Zhong-Ming,et al."Cenozoic architecture and structural development of the eastern Qaidam basin".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 59.12(2016).