沉积与特提斯地质Issue(4)：6-15,10.
滇西洱源县军马场下三叠统青天堡组冲积扇-三角洲沉积体系研究
The alluvial fan-delta depositional systems in the Lower Triassic Qingtianbao Formation, Junmachang, Eryuan, western Yunnan
摘要
Abstract
The present paper gives a detailed description of macroscopic features, compositions, textures and structures and organic fossils in main rock types from the Lower Triassic Qingtianbao Formation, Junmachang, Eryuan, western Yunnan. The facies classification is involved in three sedimentary facies including alluvial fan, fluvial and delta facies, three sedimentary subfacies including channel filling, delta front and prodelta subfacies, and six sedimentary microfacies including braided channel, flood plain, subaqueous distributary channel, interdistributary bay, channel mouth bar and sheet sand microfacies. The vertical retrogradational sequences of the alluvial fan, fluvial and delta deposits in the Lower Triassic Qingtianbao Formation in the Junmachang region shows that the widespread transgressions once took place in the Yanyuan-Lijiang basin during the Qingtianbaoan of the Early Triassic, resulting in the sedimentary evolution from the continental facies to the marine facies in the Junmachang region.关键词
沉积相/沉积演化/退积型/青天堡组/下三叠统Key words
sedimentary facies/sedimentary evolution/retrogradational deposition/Qingtianbao Formation/Lower Triassic分类
天文与地球科学引用本文复制引用
周业鑫,王剑,邹光富,王鹏,任飞,董黎阳,李俊,宁括步..滇西洱源县军马场下三叠统青天堡组冲积扇-三角洲沉积体系研究[J].沉积与特提斯地质,2013,(4):6-15,10.基金项目
中国地质调查局北衙金矿远景区深部调查项目(项目编号:1212011220249)、教育部“矿物学、岩石学、矿床学”国家重点(培育)学科建设项目(SZD0407)共同资助 （项目编号:1212011220249）
