滇西保山、泰国西部和南部及澳大利亚悉尼盆地的冈瓦纳相二叠系对比

对滇西保山地块、泰国西部和南部及澳大利亚悉尼盆地的冈瓦纳相二叠纪地层进行了对比。前两者的二叠纪地层岩性和所含生物群面貌基本可以对比 ,皆反映出由冈瓦纳相向特提斯相的转变 ,后者是典型的冈瓦纳相 ,仅早二叠世地层的岩性和所含化石与前两者相似。

CORRELATION OF GONDWANA PERMIAN STRATA IN BAOSHAN OF WESTERN YUNNAN, WESTERN AND SOUTHERN THAILAND,AND SOUTHERN SYDNEY BASIN OF AUSTRALIA

An overview on the Permian lithological characters and faunas of three Gondwana-related regions, namely the Baoshan area of West Yunnan, western and southern Thailand, and southern Sydney Basin, is here introduced. During Asselian and Sakmarian time, these three regions are very similar not only in lithology that is characterized by marine glacio-origin diamictites but also in faunas that are mainly composed of cold water brachiopods and small nondissepimental corals. Started from Artiskian, differences on lithology and faunal characters occur among these three regions. Warm water faunas such as fusulinid Pseudofusulina and conodont Sweetognathus, and carbonate deposition are present in the Baoshan area during the Artinskian. A warm water fusulinid Monodiexodina fauna occurs in Western Thailand during the Kungurian. These two regions possibly located in relatively northern area comparing to the Sydney Basin due to rifting from Gongdwanaland and drafting northward closing to the Tethyan continent. And more later time, during the Roadian to Capitanian or even Wuchiapingian, particular Cimmerian mixed fauna and complete carbonate sequence dominated in the Baoshan Block and western and southern Thailand. In the contrast, southern Sydney Basin continued to be characterized by siliciclastics and cold-water brachiopod, bivalves, and small nondissepimental corals during the Middle Permian.