Stratigraphical Sequence of Carboniferous Marine Volcanic-Deposit Rock and Its Geological Age in Jueluotage Area, Eastern Tianshan
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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NFEA1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.Abstract: 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.
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Key words:
- Jueluotage /
- Carboniferous /
- geological age /
- volcanic iron deposits /
- sedimentology /
- stratigraphy.
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图 1 东天山觉罗塔格地区大地构造分区及石炭系分布
Fig. 1. Geotectonic units and the distribution of Carboniferous in Jueluotage area, eastern Tianshan
图 2 东天山觉罗塔格地区路白山一带石炭系综合地层柱状图
1.砾岩；2.砾质砂岩；3.沉火山角砾岩；4.凝灰质砂岩；5.凝灰岩；6.安山质凝灰岩；7.集块岩；8.安山岩；9.玄武岩；10.灰岩；11.含生物碎屑灰岩；12.泥灰岩
Fig. 2. Composite stratigraphic column of Carboniferous in Lubaishan of Jueluotage, eastern Tianshan
图 3 觉罗塔格地区路白山一带石炭纪生物地层划分对比
Fig. 3. Subdivision and correlation of the Carboniferous biostratigraphy in Lubaishan of Jueluotage
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