北疆东部三塘湖与吐哈地区中侏罗统西山窑组沉积差异性及对博格达山隆升时间的约束  

The sedimentary differences of the Middle Jurassic Xishanyao Formation between Santanghu area and Turpan-Hami area and their constraint on the uplifting of the Bogda Mountain

作　　者：章惠[1] 旷红伟[2] 柳永清[2] 彭楠[3] 

机构地区：[1]中国石油大学(北京),北京102249 [2]中国地质科学院地质研究所,北京100037 [3]中国地质大学(北京),北京100083

出　　处：《地质通报》2013年第2期443-455,共13页Geological Bulletin of China

基　　金：国家自然基金重点项目<晚中生代华北克拉通破坏的古环境剧变与生物群更替响应>(批准号:90914003);国家自然科学基金面上项目<胶莱盆地恐龙化石埋藏学及其古生态与古地理意义>(批准号:41272021);中国地质调查局项目<兴蒙造山带主要中生代沉积盆地演化与能源潜力综合调查研究(编号:1212011085477)>;<北疆-内蒙二叠纪沉积盆地演化与大地构造属性(编号:1212011121067)>;<兴蒙造山带基本构造格局综合调查和研究>(编号:1212011085476)共同资助

摘　　要：在钻井资料及野外调查的基础上,通过地层、沉积、物源与古水流等资料的综合分析,对比研究北疆东部三塘湖和吐哈地区中侏罗世西山窑组地层、沉积地质学和物源与古流向发育特征。研究表明,三塘湖和吐哈地区的西山窑组地层序列、岩石组合、沉积相类型及地层间的接触关系等具有明显的一致性。西山窑组沉积的早—中期,三塘湖和吐哈地区为统一坳陷盆地;西山窑组沉积晚期,吐哈北部沉积物源和古水流体系等发生变化,沉积物碎屑成分中未见有南部觉罗塔格山的变质岩岩屑,重矿物组合也与北部博格达地区相似,古水流也表现北部来源。博格达山地区可能于西山窑组沉积期末发生隆升,将吐哈和三塘湖地区分割为互不连通的2个盆地。2个地区西山窑组之上的沉积演化和地质特征表现出明显的差异性。Based on previous researches and field survey, this paper made an integrated comparative analysis of the stratigraphy, sedi- mentary geology, provenances and paleocurrents of the Middle Jurassic Xishanyao Formation between Santanghu area and Turpan- Hami area across the Bogda Mountain as well as their constraint on the uplifting of the Bogda Mountain. The results indicate that the Xishanyao Formation in Santanghu area and in Turpan-Hami area show a high consistency in such aspects as stratigraphy, lithological association, sedimentary facies and bottom or top stratigraphic contacts. （1） The stratigraphic successions of the Xishanyao Formation in these two areas display consistent sedimentary cycles of upward fining and thinning. The bottom cycle is mainly coarser grained sediments composed mostly of grayish sandstone or pebbled sandstone, and the sediments in the middle part of the Xishanyao Formation is predominately fine grained deposits of grayish mudstone and siltstone commonly with coal seam. Upwards, sediments of this formation become chiefly fine grained and grayish pebbled sandstone, muddy siltstone interbedded with tuffaceous mudstone and thinner interclations of coal seam. However, in the top part of the Xishanyao Formation in both areas there appear coarser-grained sediments of oxidation colors. （2） Sedimentary facies of the Xishanyao Formation in these two areas consist of fan-delta, braided river-delta or meandering river delta in the lower part, and littoral and shallow lake facies or swamp deposits in the middle and top parts. （3） Reconstructed paleoclimate suggests that the Xishanyao Formation in these two areas was deposited in a warm and moist climate environment, as evidenced by lots of vegetation fossils and regional correlative carbonaceous mudstone and coal seam. （4） The Xishanyao Formation is in angular unconformity contact with the overlying Middle Jurassic Toutun Formation in Santanghu area and in parallel unconformity contact with the overlying Middle Jurassic Sanjianfang

关 键 词：北疆 三塘湖 吐哈 沉积差异 博格达山 隆升 

分 类 号：P534.52[天文地球—古生物学与地层学] P512.2[天文地球—地质学]