四川雅安-丹棱地区蓬莱镇组地层特征及沉积相分析

摘要

The present paper gives a detailed description of the measured stratigraphic sections of the Penglaizhen Formation in the Ya'an-Danling region,Sichuan,with the emphasis on the lithostratigraphy and sedimentary facies associations and horizontal variations in lithology and sedimentary facies.The Penglaizhen Formation is made up of the lake facies and lake-delta facies,and two long-term and five medium-term base-level cyclic sequences in which individual sequences and systems tracts are elucidated.The establishment of the assemblage zone Porochara maedleri-Aclistochara yunnanensis in the strata of the Penglaizhen Formation indicates a Late Jurassic age for the deposition of the Penglaizhen Formation.%本文详细描述了丹陵县石桥乡唐湾蓬莱镇组实测地层剖面,讨论了雅安-丹陵地区蓬莱镇组的岩石地层及岩相组合特征,分析了该组岩性-岩相的横向变化规律.认为该区蓬莱镇组由湖泊沉积相及湖白三角洲沉积相组成,在区内蓬莱镇组地层中建立了一个轮藻即Porochara maedleri-Aclistocharayunnanensis组合带,将蓬莱镇组归属于上侏罗统.