On Structures and Evolutions in Junggar Basin
On Structures and Evolutions in Junggar Basin
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发表时间：
2009
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通讯作者：
Z. Ning
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作者：
Z. Ning
在分析沉积构造格架、沉积岩厚度变化及其时空演化的基础上，揭示了准噶尔盆地不同地质时期沉积构造分布的主要特征，讨论了加里东末期、晚二叠世-中三叠世等不同时期基底、沉积盖层、前陆盆地变形的地球动力学演化。中侏罗世末-喜马拉雅期的构造演化模式，提出了准噶尔盆地元古宙的变形响应、盆地构造组合模式、褶皱基底动力学机制及构造演化模式，认为准噶尔盆地晚二叠世-早三叠世的变形格架为前陆冲断带-前陆凹陷-前隆-中央隆起的构造组合;晚三叠世-中侏罗世末，整个准噶尔盆地基底与沉积盖层之间变形的地球动力学环境发生了东西向挤压-盆地拉分-南北向挤压的变化，准噶尔盆地西北缘晚侏罗世推覆构造是由南北向挤压形成的;陆梁隆起以斜向逆冲-走滑构造变形为特征，喜马拉雅期形成了准噶尔盆地周边的6个边界构造段。
Based on the analysis of sedimentary and structural frameworks and variations of thickness of sedimentary rocks and their spatial-temporal evolution,this paper shows the main features of sediment-structure distributions in different periods of geological time of Junggar basin,discusses the geodynamic evolutions of deformation of basement and sedimentary cover rocks,foreland basin in different periods,such as in the end of Caledonian,Late Permian-Middle Triassic,end of Middle Jurassic and Himalayan periods,and proposes the models of deformation responses and assemblages of the basin structures as well as the dynamic mechanism and tectonic evolution of folded basement in Proterozoic.It is concluded that the structural assemblages of foreland thrust belt-foreland sag-fore uplift-central uplift form the deformation framework of Junggar basin in the Late Permian-Early Triassic;the geodynamic environments of deformation between basement and sedimentary cover rocks change with EW compression-basin pull aparting-SN compression in whole Junggar basin during the Late Triassic-end of Middle Jurassic;the nappe structure of Late Jurassic in northwestern margin of Junggar basin is formed by SN compression;the Luliang uplift is characterized by oblique thrust-strike slip structural deformation,and finally,the six boundary structural segments around Junggar basin shaped in Himalayan period.