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晚侏罗世是龙门山前陆盆地演化的关键时期 ,因而沉积体系与古环境演化研究具有重要意义 .运用比较沉积学的方法 ,通过对沉积序列与旋回的详细研究 ,将研究区晚侏罗世沉积体系分为湖泊沉积体系、三角洲沉积体系、冲积扇沉积体系以及河流沉积体系 ;基于沉积背景和演化的分析 ,确定龙门山推覆构造带是研究区晚侏罗世古环境演化和沉积体系空间配置的控制因素 ;依据古流和物源分析 ,确定西北部的龙门山是本区主要物源区
Late Jurassic is the key period of the evolution of the Longmenshan foreland basin, so the study of sedimentary system and paleoenvironment evolution is of great significance.Using comparative sedimentology, through detailed study of sedimentary sequence and cycle, the Late Jurassic Sedimentary system is divided into lacustrine sedimentary system, deltaic sedimentary system, alluvial fan sedimentary system and river sedimentary system. Based on the analysis of sedimentary background and evolution, it is determined that the Longmen Shan nappe belt is the paleoclimate evolution and sedimentary system space of Late Jurassic in the study area According to the analysis of ancient flow and provenance, Longmen Mountain in the northwest is the main source area of this area