Middle Jurassic strike slip movement and fault scale of the Altyn Tagh;fault system: Evidence from the soft sediment deformation

	Middle Jurassic strike slip movement and fault scale of the Altyn Tagh;fault system: Evidence from the soft sediment deformation
	Gong Zheng 3; Li HaiBing ; Sun ZhiMing 1; Liu DongLiang ; Pan JiaWei ; Han Liang ; Wu Chan
刊名	ACTA PETROLOGICA SINICA
	2013
卷号	29 期号:6 页码:2233-2250
关键词	Altyn Tagh fault system Soft sediment deformation Paleoearthquake Middle Jurrassic Subei
ISSN号	1000-0569
英文摘要	Marking the northern margin of the Tibet Plateau, the Altyn Tagh fault system not only truncates various geological units, controlling both the geometric characters and tectonic framework in northern Tibet, but also comprises the main passage where the landmass easternward extrude. It is crucial to study the fault system's forming, active ages and fault trace evolvement to probe the dynamic mechanism of the Tibet Plateau. Here, we take advantage of the soft sediment deformation revealed in Middle Jurassic lacustrine strata in southern Subei to explore such questions. There are generally 26 deformation layers found which can be further subdivided into 4 categories in the field: load and pillow structure, liquefied diapir and crater, liquefied breccia and convoluted structure. The grain size statistic shows the grains mainly range from 0.2 similar to 0.3mm (60%), highly comparable with the modern earthquake ejected and experimental grains size, thus we consider them as earthquake induced liquefaction. Based on the empirical statistical relation between the earthquake magnitude and the maximum liquefaction distance, we presume the minimum magnitude is 6 similar to 6.5, whereas, in view of the specific deformation structure with different magnitude, we suggest the maximum magnitude may exceed 7.5. The 26 deformation layers represent an earthquake episode in Middle Jurassic, with at least 4 earthquakes. The Altyn Tagh fault system was highly active in Middle Jurassic and the fault trace had already reached Subei area at least. Given the Triassic active age deduced from the mylonite in Xorkol and the volcano activities in Cretaceous and Jurassic, soft sediment deformation in Yumen area in Cretaceous, the Altyn Tagh fault may have experienced at least three active ages : the Late Triassic, the Middle Jurassic and the Cenozoic, with the fault length expand from several hundred kilometers to more than 1000 kilometers and to 2000 kilometers.
学科主题	构造地质学
WOS关键词	TIBETAN PLATEAU ; PALEOSEISMIC EVIDENCE ; APULIAN FORELAND ; NORTHERN ; TIBET ; FISSION-TRACK ; SEISMITES ; BASIN ; EARTHQUAKES ; EVOLUTION ; XINJIANG
WOS研究方向	Geology
语种	中文
出版者	SCIENCE PRESS
WOS记录号	WOS:000322427000027
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40103]
专题	中国地质科学院地质研究所
作者单位	1.Chinese Acad Geol Sci, Inst Geol, State Key Lab Continental Tecton & Dynam, Beijing 100037, Peoples R China. 2.Chinese Acad Geol Sci, Inst Geomech, Being 100081, Peoples R China. 3.中国地质科学院地质研究所
推荐引用方式 GB/T 7714	Gong Zheng,Li HaiBing,Sun ZhiMing,et al. Middle Jurassic strike slip movement and fault scale of the Altyn Tagh;fault system: Evidence from the soft sediment deformation[J]. ACTA PETROLOGICA SINICA,2013,29(6):2233-2250.
APA	Gong Zheng.,Li HaiBing.,Sun ZhiMing.,Liu DongLiang.,Pan JiaWei.,...&Wu Chan.(2013).Middle Jurassic strike slip movement and fault scale of the Altyn Tagh;fault system: Evidence from the soft sediment deformation.ACTA PETROLOGICA SINICA,29(6),2233-2250.
MLA	Gong Zheng,et al."Middle Jurassic strike slip movement and fault scale of the Altyn Tagh;fault system: Evidence from the soft sediment deformation".ACTA PETROLOGICA SINICA 29.6(2013):2233-2250.