鄂西长阳组的地质时代  

On the Geological Age of Changyang Formation,Western Hubei Province

作　　者：吴健辉[1] 牛志军[2] 王建雄[2] 姚华舟[2] 张仁杰[2] 

机构地区：[1]湖北省国土资源职业技术学院,荆州434000 [2]中国地质调查局武汉地质矿产研究所,武汉430223

出　　处：《科学技术与工程》2011年第7期1411-1415,共5页Science Technology and Engineering

基　　金：国家自然科学基金(40772022);中国地质调查局国土资源大调查项目(No1212010811040)资助

摘　　要：鄂西地区的长阳组长期划归下石炭统底部,所含Siphonodella levis带被认为是杜内期最底部的牙形刺化石带之一。根据新发现的牙形刺Icroides sp.,Polygnathus brevis,腕足类Cyrtospirifer sp.Schchertella gelaohoensis,和双壳类Buchiola sp.等化石现将该组改划为上泥盆统法门阶,与湖南中部的邵东组、孟公坳组、贵州者王组、革老河组等对比。牙形刺化石Sipho-nodella levis是法门晚期—杜内早期均有分布的种。Changyang Formation of western Hubei Province has been placed in the base part of Lower Carboniferous since it was set up in 1984.The Siphonodella levis zone occurred in that formation was treated as one of the lowermost conodont zones of Turnaisian for long time in China.On the basis of the new palaeontologic data including conodonts Icroides sp.,Polygnathus brevis,brachiopods Cyrtospirifer sp.Schchertella gelaohoensis,and bivalves Buchiola sp.,Changyang Formation is now assigned to the Famennian of Later Devonian.That formation may correlates with such rocks as Shaodong and Mengonao formations of Hunan Province,the Zewang and Gelaohe formations of Guizhou Province.The range of Siphonodella levis（Ni） may from the Famennian to Tournaisian,rather than the Early Tournaisian,as thought previously.

关 键 词：晚泥盆世 长阳组 鄂西 

分 类 号：P534.44[天文地球—古生物学与地层学]