| 塔里木板块西南依格孜牙剖面上泥盆统—下石炭统地层学 |
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| 作者单位： | ;1.塔里木油田分公司勘探开发研究院;2.中国科学院南京地质古生物研究所;3.中石化南方石油勘探开发公司 |
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| 摘 要： | 塔里木板块西南英吉莎县依格孜牙出露上泥盆统—下石炭统序列。克里塔格组下段以法门阶牙行刺Icriodus alternatus alternatus为特征,中段的Spathognathodus aciedentatus和Polygnathus inornatus属杜内阶上部,上段的Scaphignathus sp.大致相当于维宪阶,可能还包括部分谢尔普霍夫阶。岩相序列表明,从奇自拉夫组紫红色石英砂岩、含砾石英砂岩相变为克里塔格组台地浅海相碳酸盐岩指示一次海进过程,克里塔格组礁灰岩可视为大灭绝事件之后全球最早的珊瑚礁群落复苏代表实例之一。
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| 关 键 词： | 泥盆系—石炭系 地层 依格孜牙 塔里木板块西南 新疆 |
BIOSTRATIGRAPHY THROUGHOUT THE UPPER DEVONIAN TO LOWER CARBONIFEROUS AT THE YIGEZIYA SECTION,SW TARIM BLOCK,XINJIANG,CHINA |
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| Institution: | ,Exploration and Development Research Institute,Tarim Oilfield Company,Nanjing Institute of Geology and Palaeontology,Chinese Academy of Sciences,Sinopec Southern Oil Exploration and Development Company |
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| Abstract: | The Upper Devonian to the Lower Carboniferous sequences are outcropped at the sections of the Yigeziya,Yingjisha,southwestern Tarim Block,Xinjiang,China.Based on the conodont data,the biostratigraphy of the Kelitag Formation is discussed.Icriodus alternatus alternatus from the lower member of the Kelitag Formation indicate a Famenian age.Spathognathodus aciedentatus and Polygnathus inornatus from the middle member approximately are assigned to the upper Tounaisian;and Scaphignathus sp.of the upper member is likely of the Visean(possibly Serpukhvian).Lithofacies alternation from purple sandstone-dominated Qizilaf Formation to the shallow carbonate platform of the Kelitag Formation shows a transgressional tract.The reefal unit from the Kelitag Formation also implies the earliest recovery of coral reefal community after the Frasian-Farmenian mass extinction event. |
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| Keywords: | Devonian—Carboniferous stratigraphy Yigeziya southwest Tarim Block Xin-jiang China |
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