Biodiversification of Late Ordovician Hirnantia Fauna on the Upper Yangtze Platform,South China  

作　　者：Ian G.PERCIVAL 

机构地区：[1]Geological Survey of New South Wales,NSW Department of Primary Industries,947-953 Londonderry Road,Londonderry,NSW 2753,Australia

出　　处：《Science China Earth Sciences》2010年第12期1800-1810,共11页中国科学（地球科学英文版）

基　　金：supported by Chinese Academy of Sciences (Grant No. KZCX2-YW-Q05-01);National Natural Science Foundation of China (Grant No. 40825006);Ministry of Science and Technology of China (Grant Nos. 2006CB806402,2006FY120300-5)

摘　　要：The Hirnantia Fauna is a globally-represented,cool water brachiopod fauna that originated and flourished in shallow marine environments at intermediate to low latitudes after the first episode of the end-Ordovician mass extinction.It was well-developed,widely distributed,long in stratigraphical range,and complex in palaeoecological differentiation on the Upper Yangtze Platform of the South China paleoplate,where it has been extensively studied.Qualitative and quantitative analyses show that the FAD of the Hirnantia Fauna in South China becomes stratigraphically higher from nearshore to offshore localities on the Yangtze Platform,while the range of the fauna becomes shorter whereas the taxonomic diversity increases.Over its stratigraphical range the diversity of the Hirnantia Fauna at nearshore localities consistently decreases,but trends in the opposite direction at offshore,deeper water localities.The fauna was represented by different communities,subcommunities or associations with changing environmental factors(such as water depth and substrate) at different localities or horizons.The Hirnantia Fauna is a globally-represented,cool water brachiopod fauna that originated and flourished in shallow marine environments at intermediate to low latitudes after the first episode of the end-Ordovician mass extinction.It was well-developed,widely distributed,long in stratigraphical range,and complex in palaeoecological differentiation on the Upper Yangtze Platform of the South China paleoplate,where it has been extensively studied.Qualitative and quantitative analyses show that the FAD of the Hirnantia Fauna in South China becomes stratigraphically higher from nearshore to offshore localities on the Yangtze Platform,while the range of the fauna becomes shorter whereas the taxonomic diversity increases.Over its stratigraphical range the diversity of the Hirnantia Fauna at nearshore localities consistently decreases,but trends in the opposite direction at offshore,deeper water localities.The fauna was represented by different communities,subcommunities or associations with changing environmental factors(such as water depth and substrate) at different localities or horizons.

关 键 词：Hirnantia FAUNA biodiversification ORDOVICIAN HIRNANTIAN UPPER YANGTZE Platform South China 

分 类 号：Q915[天文地球—古生物学与地层学]