扬子区奥陶纪和志留纪四射珊瑚的起源、扩散及生物古地理关系  

ORIGIN, DISPERSION AND BIOGEOGRAPHIC AFFINITY OF ORDOVICIAN AND SILURIAN RUGOSE CORALS IN YANGTZE REGION

作　　者：何心一 陈建强 

出　　处：《现代地质》1998年第2期151-159,共9页Geoscience

基　　金：高等学校博士学科点专项科研基金

摘　　要：提出扬子区是奥陶纪、志留纪四射珊瑚的起源中心。早古生代扬子区最早出现的四射珊瑚约有３０属，包括穿孔珊瑚类Ｃａｌｏｓｔｙｌｉｓ，Ｙｏｈｏｐｈｙｌｕｍ，扭心珊瑚类Ｂｒｉａｎｔｅｌａｓｍａ，Ｔｕｎｇｕｓｅｌａｓｍａ，包珊瑚类Ａｍｐｌｅｘｏｉｄｅｓ，Ｓｙｎａｍｐｌｅｘｏｉｄｅｓ，十字珊瑚类Ｅｏｓｔａｕｒｉａ，Ｃｅｒｉａｓｔｅｒ，Ｓｔａｕｒｉａ以及泡沫珊瑚类Ｒｈｉｚｏｐｈｙｌｕｍ等。它们在扬子区中奥陶世和早志留世地层迅速繁衍，尔后扩散至欧洲、北美和其他地区。扬子区晚奥陶世四射珊瑚群与北欧同期珊瑚有较高的相似性；而该区早志留世（包括Ｗｅｎｌｏｃｋｉａｎ阶）珊瑚群的生物古地理关系与西伯利亚、哈萨克斯坦有紧密联系。扬子区早志留世珊瑚群与澳大利亚东部、北美东部同期珊瑚也有一定的相似性。t is proposed that the Yangtze region may be a center of origin of Ordovician and Silurian rugose corals. The earliest known rugose corals in this region are about 30 genera, including calostylids Calostylis and Yohophyllum, streptelasmatid Briantelasma and Tunguselasma , amplexids Synamplexoides and Amplexoides , stauriids Eostauria, Ceriaster and Stauria, and cystiphylloid Rhizophyllum and Maikottia, etc. The coral fauna developed rapidly from Middle Ordovician to Early Silurian in the Yangtze region, and then dispersed to Europe, North America and other areas. The Late Ordovician rugose corals of the Yangtze region show high similarity to the faunas of North Europe, while the Early Silurian (including Wenlockian) rugose corals from the Yangtze region seem to be close to those of Siberia and Kazakhstan in biogeographic affinity. There are also resemblances among Early Silurian rugose coral faunas of the Yangtze region, eastern Australia, and eastern North America to some extent.

关 键 词：四射珊瑚 起源中心 奥陶纪 志留记 生物古地理 

分 类 号：Q911.642[天文地球—古生物学与地层学] Q911.643[生物学—古生物学]