Palaeoclimatic Implications of Permian Fusulinids and Carbonates from the Baoshan Block, Southwestern China
Permian fusulinids and carbonate facies from the Baoshan Block, southwestern China, have been analysed to understand the Permian climatic conditions associated with this block. Fusulinid assemblages of Sakmarian, Murgabian, and Midian ages are recognized. All these assemblages have much lower generic diversity than do coeval fusulinids from tropical regions. Furthermore, the dominant elements changed from eurytopic genera to typically warm-water genera from the Sakmarian to the Midian. In addition, the association of the Sakmarian carbonate facies is similar to the heterozoan association and the Murgabian–Midian carbonate facies belongs to the Chloroforam facies of photozoan association. Such changes in fusulinid composition and carbonate facies consistently imply that the Baoshan Block experienced a climatic amelioration from warm-temperate water to tropical warm water during the Sakmarian–Midian interval.
KeywordsFusulinid Carbonate facies Palaeoclimate Permian Baoshan Block
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