地质通报2016，Vol.35Issue(2)：383-389,7.
宁夏六盘山盆地早白垩世六盘山群原型盆地特征
Characteristics of Early Cretaceous prototype basin of Liupanshan Group in Liupan- shan Basin
摘要
Abstract
Liupanshan Basin is a Mesozoic-Cesozoic rift sedimentary basin which is located in the southern North China Plate and the east extension part of Hexi Corridor and lies along Qinling-Qilian Caledonian fold belt. In this paper, the authors analyzed con⁃glomerate gravel characteristics and palaeocurrent of Liupanshan Basinand explored provenance characteristics of Lower Cretaceous strata. Outcrop observations show that separation and grinding roundness of conglomerate and sandstone of Sanqiao Group are poor , reflecting middle-low structure maturity and nearby source. At the beginning of the Early Cretaceous ,basin boundary was affected by strong compressive tectonic background of Late Jurassic,a series of highland internal basins and peripheral mountains suffered from weathering denudation, and the southwestern margin was mainly characterized by coarse clastic sedimentary piedmont pluvial fan ac⁃cumulation and deposited piedmont pluvial fan of predominantly coarse fragments,which was gradually transitional to braided river towards the interior of the basin. In late Early Cretaceous,the basin boundary was expanded towards the west. Accompanied by alter⁃nate drought-humid climate, there developed alluvial fan, braided river, delta, shallow lake and saline lake facies.关键词
原型盆地/早白垩世/盆地边界/六盘山盆地Key words
prototype basin/Early Cretaceous/basin boundary/Liupanshan Basin分类
地质学引用本文复制引用
李克永,李文厚,刘哲,张东阳..宁夏六盘山盆地早白垩世六盘山群原型盆地特征[J].地质通报,2016,35(2):383-389,7.基金项目
陕西省教育厅科学研究计划项目（编号2010JK919）、国家自然科学基金项目（批准号41330315）和陕西省自然基础研究计划 （）
