甘肃北山地区下石炭统红柳园组四射珊瑚动物群及其地质意义  

Early Carboniferous Rugose Coral Fauna Found in Hongliuyuan Formatioin in Beishan Area and Their Geological Significances

作　　者：段先锋[1] 张雄华[1] 卜建军[2] 

机构地区：[1]中国地质大学地球科学学院,武汉430074 [2]中国地质调查局武汉地质调查中心,武汉430223

出　　处：《地质科技情报》2011年第6期13-17,共5页Geological Science and Technology Information

基　　金：中国地质调查局国土资源大调查项目"西北地区中小盆地群油气资源远景调查"(1212010733506)

摘　　要：在北山地区下石炭统红柳园组中发现了丰富的的四射珊瑚,共计单体12属,17种;复体5属,7种,由下至上可划分为2个生物组合:Siphonodendron-Thysanophylloides组合和Yuanophyllum-Gangamophyllum组合,确定其时代为早石炭世大塘期。通过对北山地区珊瑚动物群与华南、欧洲以及北山地区内部不同小区的对比,认为黑鹰山小区(早古生代属哈萨克斯坦板块)和红柳园小区(属塔里木板块)珊瑚动物群面貌基本相似,总体具有特提斯大区生物群的特征,但部分地区仍具有北方大区和特提斯大区的混生特征,说明在早石炭世之前,哈萨克斯坦板块和塔里木板块之间生物未受明显的阻隔,也就是说两大板块已经拼合,北山地区海水与特提斯海域沟通,古亚洲洋在北山地区可能已经闭合。Some Early Carboniferous rugose coral are found in Hongliuyuan section in Beishan area.They are 12 genera and 17 species of solitary coral,and 5 genera and 7 species of compound coral.They are can be divided into two biological assemblages,upwardely,Yuanophyllum-Gangamophyllum and Siphonodendron-Thysanophyllum.The geological time should be the Datangian.The correlation of the rugose coral fauna with that from Beishan area and South China and Europe,and with that from different districts inside the area suggests that coral fauna from Heiyingshan area,belonging to the Kazakhstan plate in Early Paleozoic,and that from Hongliuyuan area,belonging to Tarim plate,are similar,for they have the characteristic of the transitional type of the Tethyan faunal province and northern faunal province,mostly belonging to Tethyan faunal province.This implies that the biobarrier was not significant between Kazakhstan plate and Tarim plate before Early Carboniferous,which means that the two plates were put together in Early Carboniferous,Tethys Ocean communicated with the sea of Beishan area and Paleo-Asian Ocean might have been closed in Beishan area.

关 键 词：四射珊瑚 古环境 古地理 早石炭世 北山地区 

分 类 号：Q915.813[天文地球—古生物学与地层学]