Abstract:

Stromatoporolds-coral patch reefof Lateordovlcaln Sanjushan Formation In Dashanjlaoof Yushan,Jlangxl Province,developed on an isolated carbonateplsteform In Sanshan region.It is a complex and multlcycle superimposed reefcomposed vertlcallyby two patch reefs.Themain reef-building organisms are Tabulato,stromatoporolds andalge.Basedon the paleoecology of reef-building organisms,they could be divided into four communities.It is consideredthat the rock types of the reef complex are dominantly baffflestone,bind-bafflestone,bafflebindstone and algal binded framestone.Reef fades may be divided into five subfacles such asreef base,reef core,interreef deposit,reef talus and reef cap.The reef core underwent clearlythree evolution cycles.The evolution of the reef was controlled by structures and the fillingof argillaceous debris.