山东灵山岛早白垩世构造演化及地质意义

    EARLY CRETACEOUS TECTONIC EVOLUTION OF LINGSHAN ISLAND IN SHANDONG PROVINCE AND ITS GEOLOGIC SIGNIFICANCE

    • 摘要: 灵山岛发育一系列断层、褶皱、岩墙群、节理等应力感应构造。通过对不同剖面构造现象的分析发现,灵山岛地区由早白垩世末期至青山期末期(可能)至少经历了3次挤压和2次伸展事件。研究表明,灵山岛莱阳期末期受NWW—SEE向的挤压,莱阳期末期至青山期初期发生了NW—SE向伸展,青山期初期之后发生了近EW向到NE—SW向的挤压,再之后则经历了NW—SE向伸展和NW—SE向挤压。与胶莱盆地构造应力场特征的对比显示,本地区构造发育特征更为复杂,明确本地区构造应力机制及应力场方向的变化,对其原型盆地的恢复及深部动力学机制的探讨都具有重要意义。

       

      Abstract: Many structures, such as faults, folds, dykes, joints, have been found at the Lingshan Island. According to these structures, there were at least three compressional periods and two extensional periods from the Late Laiyang to Late Qingshan stages. Tectonically the study area suffered a NWW-SEE compression in the Late Laiyang stage, a NW-SE extension from the Late Laiyang stage to Early Qingshan stage, a nearly E-W to NE-SW extrusion after the Early Qingshan stage, a later NW-SE extension and a NW-SE extrusion. It is obvious that the tectonic stress field of this area is more complicated than that in the Jiaolai Basin. The clarification of tectonic stress mechanism and the evolution of stress field orientation are significant to restore the pro-type basin and the continental dynamics.

       

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