Cenozoic tectonic evolution of the western Qaidam Basin and its;constrain on the growth of the northern Tibetan Plateau.

	Cenozoic tectonic evolution of the western Qaidam Basin and its;constrain on the growth of the northern Tibetan Plateau.
	Wu Chan 4; Yan CunFeng 1; Li HaiBing ; Tian GuangRong 1; Sun ZhiMing 2; Liu DongLiang ; Yu ChangQing ; Pan JiaWei
刊名	ACTA PETROLOGICA SINICA
	2013
卷号	29 期号:6 页码:2211-2222
关键词	Qaidam Basin Fold belts Backward propagation Altyn Tagh fault Tibetan Plateau
ISSN号	1000-0569
英文摘要	The Qaidam Basin, a Cenozoic petroliferous basin, lies on the margin of the northern Tibetan Plateau. It records a lot of information about uplift and expansion of the northern Tibetan Plateau. High resolution satellite images, geophysical data and magnetostratigraphy chronology data are used to analyze the mechanism and development of fold belts in the western Qaidam Basin. It reveals that: (1) Hongsanhan, Jiandingshan-Heiliangzi, Nanyishan and Youshashan fold belts are all composed of asymmetric vertical or homoclinal folds related to thrusting, of which, just as the Jura-type fold, the tight anticline alternates with gentle syncline, indicating a decollement structure at depth; (2) Folds with gentle SW limb and sharp NE limb like Hongsanhan and Jiandingshan-Heiliangzi fold belts are formed by northeastward thrusting; the southwestward thrusting creates a fold with sharp SW limb and gentle NE limb, like Youshashan fold; the relative symmetric Nanyishan fold belt results from NW-SE thrusting; (3) The growth strata on the Hongsanhan, Jiandingshan-Heiliangzi and Nanyishan fold belts are Xiaganchaigou, Shizigou and Qigequan formations, with the high-resolution magnetostratigraphic age of similar to 39. 5Ma, similar to 8. 2Ma and similar to 2. 5Ma, respectively. The initial time of growth strata presents the initial formation age of the fold belt as well as the age of thrusting. A series of similar drainage systems on the Youshashan fold belt is bending along the regional tectonic strike. This implies that the ongoing growth is taking placed in the Youshashan region. The SN vertical Hongsanhan fold, along with dome-like superimposed fold in the western Qaidam Basin, indicates a EW compression associated with the strike-slip of the Altyn Tagh fault; (4) Based on the tectonic geomorphology, growth strata, seismic reflection profiles and magnetostratigraphy,, the main fold belts in the western Qaidam Basin result from southward propagating during Cenozoic. The backward propagation model indicates that Indian-Asian collision stress has reached the northern part of the Qaidam Basin at similar to 40Ma, formed the Hongsanhan thrust-fold belt. With the continuous compressing, Jiandingshan, Nanyishan and Youshashan fold belts come into being one by one, of which, the latter two fold belts, the composition of the present "Yingxiongling", are formed under the strong S-N compression since similar to 2. 5Ma. Since similar to 8Ma, the intensive activity of the Altyn Tagh fault had affected the entire Qaidam basin.
学科主题	构造地质学
WOS关键词	ALTYN-TAGH FAULT ; QINGHAI PROVINCE ; HEXI CORRIDOR ; QILIAN-SHAN ; NW ; CHINA ; UPLIFT ; MAGNETOSTRATIGRAPHY ; MANTLE ; RECONSTRUCTION ; GEOCHRONOLOGY
WOS研究方向	Geology
语种	中文
出版者	SCIENCE PRESS
WOS记录号	WOS:000322427000025
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40118]
专题	中国地质科学院地质研究所
作者单位	1.CAGS, Inst Geol, State Key Lab Continental Tecton & Dynam, Beijing 100037, Peoples R China. 2.CNPC, Res Inst Petr Explorat & Dev, Northwest Branch, Lanzhou 730020, Peoples R China. 3.CAGS, Inst Geomech, Lab Paleonzagnetism, Beijing 100081, Peoples R China. 4.中国地质科学院地质研究所
推荐引用方式 GB/T 7714	Wu Chan,Yan CunFeng,Li HaiBing,et al. Cenozoic tectonic evolution of the western Qaidam Basin and its;constrain on the growth of the northern Tibetan Plateau.[J]. ACTA PETROLOGICA SINICA,2013,29(6):2211-2222.
APA	Wu Chan.,Yan CunFeng.,Li HaiBing.,Tian GuangRong.,Sun ZhiMing.,...&Pan JiaWei.(2013).Cenozoic tectonic evolution of the western Qaidam Basin and its;constrain on the growth of the northern Tibetan Plateau..ACTA PETROLOGICA SINICA,29(6),2211-2222.
MLA	Wu Chan,et al."Cenozoic tectonic evolution of the western Qaidam Basin and its;constrain on the growth of the northern Tibetan Plateau.".ACTA PETROLOGICA SINICA 29.6(2013):2211-2222.