地质学报2011，Vol.85Issue(3)：383-395,13.
青海囊谦古近纪盆地沉积特征及沉积环境分析
Sedimentary Characteristics and Environment of the Paleogene Nangqian Basin in Qinghai Province
摘要
Abstract
Nangqian basin is a typical representative of the medium-mini-type Paleogene basins controlled by the local north-northwest-trending faults and distributing along the Jinsha-Red River belt in the northeastern margin of Qinghai-Tibet. Combined with the results of field geological investigation, and analysis and determination of samples, as well as the indoor comprehensive study, the paleoclimate characteristics, indications of sedimentary facies, the provenance, as well as depositional environment of Gonjo Formation in the Nangqian basin were systematically analyzed in the framework of basin evolution. It is concluded that the Gonjo Formation can be divided into a three-stage structure, and the depositional environment is an alluvial fan-river-lake-delta environment; the complex conglomerate gravel composition, the poorly sorted and rounded sandstone, and the fillings being the sub-angular shaped inequigranular grit , the calcite cement or the ferruginous cement indicate that the sedimentary environment is proximal and quickly accumulated, and the paleocurrent direction is versatile; the depositional environments belong to warm and moist-dry climate with strong evaporation.关键词
沉积环境/沉积特征/古近纪/物源/囊谦盆地Key words
Depositional Environment/ Sedimentary characteristics/ Paleogene/ Provenance/ Nangqinbasin引用本文复制引用
杜后发,姜勇彪,严兆彬,侯增谦,杨天南,郭福生,杨庆坤..青海囊谦古近纪盆地沉积特征及沉积环境分析[J].地质学报,2011,85(3):383-395,13.基金项目
本文为国家自然科学基金项目(编号U0933605)、中国地质调查局地质调查工作项目(编号1212010818096)资助的成果. （编号U0933605）
