东天山觉罗塔格地区石炭纪火山-沉积岩地层序列及地质时代  

Stratigraphical Sequence of Carboniferous Marine Volcanic-Deposit Rock and Its Geological Age in Jueluotage Area,Eastern Tianshan

作　　者：张雄华[1] 黄兴[1] 陈继平[1] 廖群安[1] 段先锋[1] 

机构地区：[1]中国地质大学地球科学学院,湖北武汉430074

出　　处：《地球科学（中国地质大学学报）》2012年第6期1305-1314,共10页Earth Science-Journal of China University of Geosciences

基　　金：中国地质调查局地质调查工作项目(No.1212011085469)

摘　　要：通过对东天山觉罗塔格地区路白山、夹白山及雅满苏一带石炭纪生物地层及年代地层研究,厘定了石炭系地层序列,划分出了□带、四射珊瑚及腕足类化石组合,确定雅满苏组下段、中段地质时代为早石炭亚纪大塘世旧司期-上司期,上段时代为大塘世德坞期,与海相火山岩型铁矿有关的火山岩层位多为大塘世旧司期.根据古生物化石组合确定了底坎尔组地质时代为晚石炭亚纪威宁世罗苏期,土古土布拉克组时代为威宁世滑石板期,与火山岩型铁矿有关的火山岩层位为威宁世滑石板期.此外,通过区域岩石地层对比及地层时代研究,认为前人在雅满苏组之下所划分的小热泉子组在区域上可出现在雅满苏组的中下部,层位极不稳定,应予废弃.在上述年代地层序列的研究基础上,最后对觉罗塔格地区石炭纪大地构造背景演化进行了讨论.By the study on the Carboniferous biostratigraphy and geological age in Lubaishan,Jiabaishan and Yamansu areas in Jueluotage,the Carboniferous sequence is revised,and the fusulinid zone,coral assemblages and brachiopod assemblages are divided.It is suggested that the geological age of Lower and Middle member of Yamansu Formation is Jiusian-Shangsian in the Early Carboniferous;while the Upper member is Dewuan,and the strata of volcanic deposit which is correlated with the marine volcanic type iron is Jiusian.What＇s more,these fossil assemblages indicate that the age of Dikanr Formation is Luosuan in the Late Carboniferous,and the age of Tugutu Bulak Formation is Huashibanian,volcanics horizon here was forming in Huashibanian.Besides,this paper suggests that the Xiaorequanzi Formation should be abandoned since this formation can belong to the Middle-Lower part of Yamansu Formation in this area.The geotectonic background of Carboniferous is also discussed in this paper.

关 键 词：觉罗塔格 石炭纪 地质时代 火山岩型铁矿 沉积学 地层学 

分 类 号：P53[天文地球—古生物学与地层学]