气候变化领域集成服务门户(CCPortal): Magnetostratigraphy of Cenozoic sediments from the Xining Basin: Tectonic implications for the northeastern Tibetan Plateau

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DOI	10.1029/2005JB004187
	Magnetostratigraphy of Cenozoic sediments from the Xining Basin: Tectonic implications for the northeastern Tibetan Plateau
	Dai, Shuang; Fang, Xiaomin; Dupont-Nivet, Guillaume; Song, Chunhui; Gao, Junping; Krijgsman, Wout; Langereis, Cor; Zhang, Weilin
发表日期	2006
ISSN	2169-9313
EISSN	2169-9356
卷号	111 期号:B11
英文摘要	The Xining subbasin of the Longzhong basin holds the longest continuous Cenozoic stratigraphic record at the margin of the northeastern Tibetan Plateau. Despite a rich biostratigraphic content (including the Xiejia mammal fauna), the tectonic evolution of the basin is largely unconstrained. In this study we present stratigraphic, biostratigraphic, and magnetostratigraphic results that provide a basis for reconstructing the Cenozoic tectonic evolution of the Xining basin with respect to adjacent regions of the northeastern Tibetan Plateau. Magnetostratigraphic analysis from three red bed sections in the Xining basin indicates continuous deposition at low and nearly constant accumulation rates (average 2.2 cm/kyr) from 52.0 to 17.0 Ma. We interpret this result to indicate that no major regional tectonic event implying large sediment accumulation variations has affected the Xining basin deposition during this considerable time window. In detail, accumulation rate variations outline a three-stage evolution with 1.8 cm/kyr from 52.0 Ma to 34.5 Ma, 4.1 cm/kyr from 34.5 to 31.0 Ma, and 2.3 cm/kyr from 31.0 to 17.0 Ma. The second-order increase between 34.5 and 31.0 Ma can be interpreted to result from either a distal tectonic event or to be of climatic origin. Although the region was tectonically quiescent for much of the Cenozoic, tectonic activity occurred during basin initiation (or reactivation) at circa 55.0-52.5 Ma and during intense basin deformation after 17.0 Ma.
关键词	ALTYN-TAGH FAULT MIOCENE MAMMALIAN FOSSILS APATITE FISSION-TRACK QILIAN-SHAN TERTIARY DEPOSITS GANSU PROVINCE LINXIA BASIN HISTORY MA UPLIFT
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000241985900002
来源期刊	JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
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/257441
推荐引用方式 GB/T 7714	Dai, Shuang,Fang, Xiaomin,Dupont-Nivet, Guillaume,et al. Magnetostratigraphy of Cenozoic sediments from the Xining Basin: Tectonic implications for the northeastern Tibetan Plateau[J]. 中国科学院青藏高原研究所,2006,111(B11).
APA	Dai, Shuang.,Fang, Xiaomin.,Dupont-Nivet, Guillaume.,Song, Chunhui.,Gao, Junping.,...&Zhang, Weilin.(2006).Magnetostratigraphy of Cenozoic sediments from the Xining Basin: Tectonic implications for the northeastern Tibetan Plateau.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,111(B11).
MLA	Dai, Shuang,et al."Magnetostratigraphy of Cenozoic sediments from the Xining Basin: Tectonic implications for the northeastern Tibetan Plateau".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 111.B11(2006).