古地理学报2017，Vol.19Issue(3)：445-456,12.DOI:10.7605/gdlxb.2017.03.034
宁夏固原古近系寺口子组砂岩成因探讨
Discussion about origin of the Paleogene Sikouzi Formation sandstones in Guyuan, Ningxia
摘要
Abstract
The Paleogene Sikouzi Formation sandstones in Guyuan,Ningxia provide great potential for understanding paleo-environment of the Paleogene inland in China.Based on the lithology,sedimentary structures,surface features of quartz grains and grain size distribution,the orgin of these red sandstones are intensively discussed.This study indicates that the Paleogene Sikouzi Formation sandstones are with a combination of three kinds of sedimentary members:The Member Ⅰ of Sikouzi Formation is fluvial sedi-ments;the Member Ⅱ of Sikouzi Formation,as the main part of the sandstones,belongs to the typical eolian sandstones,and it can be inferred that the sedimentary environment is eolian sand dunes and inter-dunal depression;the Member Ⅲ of Sikouzi Formation is judged to be lacustrine sediments preliminarily. Combined with the palaeoclimate,orographic condition of the study area and palaeowind,the eolian de-posits,as the main part of the Sikouzi Formation sandstones,can be deduced to develop in desert envi-ronment controlled by the planetary-wind system.关键词
固原/寺口子组/风成砂岩/古近纪/沙漠沉积Key words
Guyuan/Sikouzi Formation/eolian sandstones/Paleogene/desert sediments分类
天文与地球科学引用本文复制引用
杨帆,李孝泽..宁夏固原古近系寺口子组砂岩成因探讨[J].古地理学报,2017,19(3):445-456,12.基金项目
国家自然科学基金项目(编号:41272191 （）
40672122)资助.[Financially supported by the National Natural Science Foundation of China (No.41272191 （）
40672122)] （）
