Carboniferous Phylloid Algal Reefs in Ziyun County , Guizhou (South China): Evidence of Algal Blooms

Key words: 
• phylloid algal reef /
• reef building /
• late Carboniferous /
• Ziyun

Abstract: Late Carboniferous phylloid algal reefs developed on the carbonate platform margin in Ziyun County, Guizhou (South China). Phylloid algal reefs are morphologically diverse, including isolated small patches, complex superposed bodies, and largesized reefs. The constructional role of algal was decisive in contributing to build frameworks. Three growth stages with distinct parts were recognized by our investigations: (1) the reef base consisting of a bioclastic shoal, (2) the reef core, when phylloid algae proliferated and contributed to reef growth, and (3) the reef cover indicating the termination of phylloid algal growth. In one of the studied case, five phases of algal blooms were recognized during the growth of a largesized phylloid algal reef, as indicated by clearly marked intervals separating these phases of algal proliferation.〖JP〗