Magnetostratigraphy of Paleogene sediments from northern Qaidam Basin,;China: Implications for tectonic uplift and block rotation in northern;Tibetan plateau

doi:10.1016/j.epsl.2005.07.007

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	Magnetostratigraphy of Paleogene sediments from northern Qaidam Basin,;China: Implications for tectonic uplift and block rotation in northern;Tibetan plateau
	Sun, ZM 4; Yang, ZY ; Pei, JL ; Ge, XH ; Wang, XS ; Yang, TS ; Li, WM ; Yuan, SH
刊名	EARTH AND PLANETARY SCIENCE LETTERS
	2005
卷号	237 期号:3-4 页码:635-646
关键词	magnetostratigraphy Qaidam Basin Eocene Oligocene rotation
ISSN号	0012-821X
DOI	10.1016/j.epsl.2005.07.007
英文摘要	We have carried out a detailed magnetostratigraphic study of Tertiary sediments in the northern margin of the Qaidam Basin, northern Tibetan plateau. A total of 400 paleomagnetic samples (with an interval of about 2 m) were collected from the Shanggancaigou and Xiagancaigou Formations in the Hongsanhan section. Stepwise thermal demagnetization was used to isolate the magnetic components in these samples. A higher temperature component (HTC) was separated between 300 and 680 degrees C from most of samples. Positive fold and reversal tests suggest a primary origin for the HTC. A magnetic polarity sequence is established and then compared with the geomagnetic polarity time scale. Ostracoda assemblages and also a fission track age from an adjacent section suggest a Tertiary age of the Shanggancaigou and Xiagancaigou Formations in the Hongsanhan area. The magnetozones in the Xiagancaigou Formation may correspond to subchrons C16n-CI8 ranging from > 40 to 35.5 Ma (Mid-Eocene), and the Shanggancaikou Formation to subchrons C8.2n-C15 (age from 35.5 to 26.5 Ma Late Eocene to Late-Mid Oligocene). The accumulation of sandy conglomerate and conglomerate layers on top of the Shanggancaikou Formation, and an abrupt increase in sedimentation rates are probably resulted from the main uplift of the north Qaidam at about 30 Ma. When compared with coeval directions expected from Eurasia, the mean declinations indicate a slight vertical-axis rotation of the northern Qaidam Basin since the Mid-Eocene. Sinistral shear strain may be concentrated on the Altyn Tagh Fault (ATF). (c) 2005 Elsevier B.V. All rights reserved.
学科主题	地层学与地史学
WOS关键词	ALTYN-TAGH FAULT ; CENTRAL-ASIA ; RED BEDS ; PALEOMAGNETIC DATA ; WESTERN ; CHINA ; TARIM BASIN ; MAGNETIC-ANISOTROPY ; NORTHWESTERN CHINA ; TIAN-SHAN ; NW CHINA
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000232155200023
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/38095]
专题	中国地质调查局成都地质调查中心
作者单位	1.CAGS, Lab Paleomagnetism, Inst Geomech, Beijing 100081, Peoples R China. 2.Nanjing Univ, Dept Earth Sci, Nanjing 210008, Peoples R China. 3.Jilin Univ, Coll Earth Sci, Changchun 130023, Peoples R China. 4.中国地质科学院地质力学研究所
推荐引用方式 GB/T 7714	Sun, ZM,Yang, ZY,Pei, JL,et al. Magnetostratigraphy of Paleogene sediments from northern Qaidam Basin,;China: Implications for tectonic uplift and block rotation in northern;Tibetan plateau[J]. EARTH AND PLANETARY SCIENCE LETTERS,2005,237(3-4):635-646.
APA	Sun, ZM.,Yang, ZY.,Pei, JL.,Ge, XH.,Wang, XS.,...&Yuan, SH.(2005).Magnetostratigraphy of Paleogene sediments from northern Qaidam Basin,;China: Implications for tectonic uplift and block rotation in northern;Tibetan plateau.EARTH AND PLANETARY SCIENCE LETTERS,237(3-4),635-646.
MLA	Sun, ZM,et al."Magnetostratigraphy of Paleogene sediments from northern Qaidam Basin,;China: Implications for tectonic uplift and block rotation in northern;Tibetan plateau".EARTH AND PLANETARY SCIENCE LETTERS 237.3-4(2005):635-646.