柴达木盆地旺尕秀地区上侏罗统—下白垩统风成砂的发现及其意义<sup>*</sup>

doi:10.7605/gdlxb.2018.05.054

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Abstract

In this study,Upper Jurassic-Lower Cretaceous aeolian deposits have been discovered from the stratigraphic succession overlying the Hongshuigou Formation in Wanggaxiu area,the Qaidam Basin. The typical lines of evidence for eolian deposits can be identified in both rock micro-structures and depositional features: The strata mainly consist of pure brown fine-medium grained sandstones dominated by well sorted and rounded quartz grains. Obvious eolian grain surface textures such as dish-shaped impact crater and crescent-shaped impact scars can be observed under SEM. Well-developed thick,large scale and high dip tabular cross-bedding is characteristic of eolian dune foresets. Synsedimentary deformation structures such as drag folds and overturned folds are common in the eolian strata. According to lithology and sedimentary structural characteristics,four subfacies are recognized in the Wanggaxiu eolian deposits. The dune subfacies is characterized by large-scale cross bedding. Waddy,inter dunes and desert lake are featured as aqueous deposits. The discovery of the Wanggaxiu eolian strata has enriched sedimentary types in the Mesozoic sediments in the Qaidam Basin and is of a certain significance for the study of regional stratigraphic correlation,and Late Mesozoic palaeoclimatic and palaeogeographic evolution of the northwest China.

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	Articles by authors
	Hu Jun-Jie
	Ma Yin-Sheng
	Wu Yi
	Wang Zong-Xiu
	Liu Yong-Qing
	Gao Wan-Li
	Li Zong-Xing
	Wei Xiao-Jie

Key words： Qaidam Basin Upper Jurassic-Lower Cretaceous aeolian sands microscopic features sedimentary structure

Received: 23 January 2018

ZTFLH:

P512.2+1

Fund:

Young Scientists Foundation of National Natural Science Foundation of China(Nos. 41602125,41702124),the National Natural Science Foundation of China(Nos. 41372109,41672111,41772272),China Postdoctoral Science Foundation(No.2016M601085)and the Geological Survey Project of China Geological Survey(No.12120115003401)

Corresponding Authors: Ma Yin-Sheng,born in 1962,is a professor of the Institute of Geomechanics,Chinese Academy of Geological Sciences,with a Ph.D. degree obtained from the Chinese Academy of Geological Sciences. He is mainly engaged in tectonics and petroleum geology. E-mail: mayinsheng@sohu.com.

About author: Hu Jun-Jie,born in 1987,is a research associate of the Institute of Geomechanics,Chinese Academy of Geological Sciences,with a Ph.D. degree obtained from the China University of Geosciences at Beijing. He is mainly engaged in the study of sdimentology and petroleum geology. E-mail: howimet@foxmail.com.

Cite this article:

Hu Jun-Jie,Ma Yin-Sheng,Wu Yi et al. Discovery and significance of the Upper Jurassic-Lower Cretaceous eolian sands in Wanggaxiu area, Qaidam Basin[J]. JOPC, 2018, 20(5): 776-786.

URL:

http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2018.05.054 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2018/V20/I5/776

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