皖南二叠纪含煤岩系沉积环境与成煤模式

THE DEPOSITIONAL ENVIRONMENT AND COAL-FORMING MODEL OF THE PERMLAN COAL-BEARING ROCK SERIES IN SOUTH ANHUI

安徽南部广泛分布着扬子型二叠纪合媒岩系（龙潭煤系），根据该区沉积特征可划分两种沉积亚型印象即巢县亚型和宿松亚型。本文着重从沉积环境、岩石类型及结构、沉积构造、古生物等方面叙述各沉积相特征，根据沉积相垂向序列组合及时空演化，建立了皖南地区二叠纪四种沉积模式和三种成煤模式。分析了不同环境下的聚煤特征。

The Yangtze Permian coal - bearing rock series (the Longtan coal series) distribute in South Anhui broadly , and can bedivided into the Chaoxian and the Susong two depositional subtypes based on the depositional features in the district. The features of de-positional facies are described substantially in the aspects of depositional environment ,rock types and textures , depositional structures and palaeotology. Four depositional models and three coal -forming models of the Permian are established in South Anhui according to thevertical sequence association and temporal - spatial evolution. Analysis has been made on coal -forming features under different environ-ments, and the coal - enriching centre also pointed out.