NDLI: Tectonic uplift and sedimentary evolution of the Jiuxi Basin in the northern margin of the Tibetan Plateau since 13 Ma BP

Content Provider	Springer Nature Link
Author	Song, Chunhui Fang, Xiaomin Li, Jijun Gao, Junping Zhao, Zhijun Fan, Majie
Copyright Year	2001
Abstract	Sediments shed from the northern margin of the Tibetan Plateau, the Qilian Mountains, are widely deposited in the foreland basin, the Jiuxi Basin, archiving plenty of information about the mountain surface uplift and erosion history. The Laojunmiao section, 1960 m thick, representing the upper sequence of the Cenozoic basin sediments, is paleomagnetically dated to about 13-0 Ma BP. Detailed sedimentary study of this sequence has revealed five sedimentary facies associations which determine four stages of sedimentary environment evolution. They are: (I) the half-deep lake system before 12.18 Ma BP, (II) the shallow lake system between 12.18 and 8.26 Ma BP, (III) the fan delta dominated sedimentary system in dry climate between 8.26 and 6.57 Ma BP, and (IV) alluvial fan system since 6.57 Ma BP. The associated mountain erosion and uplift are suggested to have experienced three phases, that is, tectonic stable (13-8.26 Ma BP), gradual uplift (8.26-<4.96 Ma BP), and rapid intermittent uplift (>3.66-0 Ma BP). The uplift at ∼3.66 Ma BP is of great importance in tectonics and geomorphology. Since then, tectonic uplift and mountain building have been accelerated and become strong intermittent. At least three significant tectonic events took place with ages at <1.80-1.23, 0.93-0.84 and 0.14 Ma BP, respectively. Thus, the uplift of the northern Tibetan Plateau is a complex process of multiple phases, unequal speed and irregular movements.
Starting Page	192
Ending Page	202
Page Count	11
File Format	PDF
ISSN	10069313
Journal	Science in China Series D: Earth Sciences
Volume Number	44
Issue Number	1
e-ISSN	18622801
Language	English
Publisher	Science in China Press
Publisher Date	2001-01-01
Publisher Place	Beijing
Access Restriction	Subscribed
Subject Keyword	sedimentary facies evolution tectonic uplift Hexi Corridor Tibetan Plateau Geosciences
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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