川西北地区早中志留世生物礁发育特征初探

PRELIMINARY STUDY OF DEVELOPMENT CHARACTERISTIC OF ORGANIC REEFS IN EARLY-MIDDLE SILURIAN, NW SICHUAN

川西北地区早中志留世生物礁,是生活在以陆源沉积物为主的浅海陆棚环境中生屑滩上的点礁,生屑滩的形成为风暴作用所致,其发育受到埋藏反馈作用的影响。大量的陆源物质注入及带入的过剩养料是抑制生物礁发育的主要因素。

Organic reefs in Early-Middle Silvrian, NW Sichuan, are small patch reefs on bioclastic banks in offshore continental shelf environment dominated by terrigenous sediments. The bioclastic banks are formed by storm action. The development of organic reefs is influenced by taphonomic feedback process. The input of massive terrigenous sediments and the excess of terrgenous nutrients are the major factors to control their development.