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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摘要

本次研究在柴达木盆地旺尕秀地区上侏罗统红水沟组上覆地层中,首次发现了风成沉积。地层主体为一套棕黄色细—中砂岩,由分选、磨圆好的石英砂组成;扫描电镜下可见风成砂特有的碟形撞击坑和新月形撞击坑等特征;层内普遍发育风成大型高角度板状交错层理,层系厚度巨大,风成沙丘前积层特征明显;发育液化作用产生的牵引褶曲、倒转褶曲等常见的风成沙丘同沉积变形构造。根据岩性和沉积构造特征共在地层中识别出4种沉积亚相: 沙丘亚相、丘间亚相、旱谷亚相和沙漠湖亚相,其中沙丘亚相以风成大型交错层理为显著特征,丘间、旱谷和沙漠湖亚相则以水成沉积为主。风成砂沉积的存在丰富了柴达木盆地中生代的沉积类型,为区域地层对比及西北地区晚中生代古气候和古环境研究提供了新的证据和材料。

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	胡俊杰
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	高万里
	李宗星
	魏小洁

关键词 ：柴达木盆地, 上侏罗统-下白垩统, 风成砂, 显微特征, 沉积构造

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.

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

收稿日期: 2018-01-23

ZTFLH:

P512.2+1

基金资助:

国家自然科学基金青年科学基金项目(编号: 41602125,41702124)、国家自然科学基金项目(编号: 41372109,41672111,41772272)、中国博士后科学基金项目(编号: 2016M601085)及中国地质调查局项目(编号: 12120115003401)联合资助

通讯作者: 马寅生,男,1962年生,毕业于西安地质学院,在中国地质科学院获得博士学位。现为中国地质科学院地质力学研究所研究员、博士生导师,主要从事构造地质学和石油地质学方向的研究。E-mail: mayinsheng@sohu.com。

作者简介: 胡俊杰,男,1987年生,毕业于成都理工大学,在中国地质大学(北京)获得博士学位。现工作于中国地质科学院地质力学研究所,助理研究员,主要从事沉积学和石油地质学方向的研究。E-mail: howimet@foxmail.com。

引用本文:

胡俊杰,马寅生,吴祎等. 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^*[J]. 古地理学报, 2018, 20(5): 776-786.

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.

链接本文:

http://journal09.magtechjournal.com/gdlxb/CN/10.7605/gdlxb.2018.05.054 或 http://journal09.magtechjournal.com/gdlxb/CN/Y2018/V20/I5/776

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