沉积与特提斯地质2025，Vol.45Issue(1)：90-101,12.DOI:10.19826/j.cnki.1009-3850.2024.09005
西藏昌都察雅地区上三叠统阿堵拉组—夺盖拉组河口湾相的发现及意义
The discovery and significance of the estuarine facies in the Upper Triassic Adula-Duogaila Formation,Chaya region,Qamdo area,Xizang
摘要
Abstract
The study of sedimentary structures,lithological combinations,and sedimentary sequences of the Adula-Duogaila Formation in Gangka Village,Chaya County,Qamdo City,shows the presence of estuarine facies during the sedimentary period of the Adula-Duogaila Formation.Further analysis subdivides the estuarine facies into fluvial subfacies and tidal flat subfacies.The fluvial subfacies can be further subdivided into riverbed suborder facies and floodplain suborder facies.The riverbed suborder facies is characterized by thick-bedded conglomerate and feldspathic litharenite,while the floodplain suborder facies is distinguished by deposits of siltstone,mudstone,and carbonized plant fragments.Sedimentary structures such as cross-bedding,trough cross-stratification,and parallel bedding can be observed in the fluvial subfacies.The tidal flat subfacies can be further distinguished into subtidal,intertidal,and supratidal suborder facies.The subtidal suborder facies is characterized by mudstone and lithic sandstone,with the development of ripple bedding.The intertidal suborder facies is characterized by deposition of siltstone and mudstone,with interference ripple marks,lenticular bedding,and wave-like bedding as prominent sedimentary structures.The supratidal suborder facies is characterized by mudstone and carbonaceous mudstone,with interbedded lenses of siltstone,and sedimentary structures such as horizontal bedding and rain prints.关键词
昌都地区/上三叠统/河口湾相/沉积次相Key words
Qamdo area/Upper Triassic/estuarine facies/sedimentary suborder facies分类
地质学引用本文复制引用
张青松,牟传龙,王启宇,侯乾..西藏昌都察雅地区上三叠统阿堵拉组—夺盖拉组河口湾相的发现及意义[J].沉积与特提斯地质,2025,45(1):90-101,12.基金项目
国家自然科学基金地质联合基金重点项目(U2344209) （U2344209）
中国地质调查局项目(DD20221661) （DD20221661）
