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块断差异运动与辽河裂谷形成机制 渤海湾早第三纪诸坳陷是一个规模巨大的裂谷系。前第三纪的基岩断块主要由前震旦系混合花岗岩、震旦亚界和下古生界的碳酸盐岩以及中生界的火山岩组成,可近似地看成刚性岩块。这个地区的区域断裂构造线的走向主要有前中生代的北西向和近东西向;晚中生代为北东和北东东向。受这两组断裂构造线的切割,基岩被肢解为一系列大小各异的菱形断块。早第三纪在区域性引张应力场作用下,发生剧烈的块断差异运动。
Block-break movement and mechanism of Liaohe Rift The Early Tertiary depressions in the Bohai Bay is a large-scale rift system. The pre-Tertiary bedrock faulted blocks are mainly composed of pre-Sinian mixed granites, sub-Sinian sub-Paleozoic carbonate rocks and Mesozoic volcanic rocks, which can be roughly considered as rigid blocks. The trend of regional fault tectonic line in this area mainly includes the pre-Mesozoic northwest direction and the near-east-west direction. The Late Mesozoic is the NE and NE direction. By the cutting of these two groups of fault tectonic lines, the bedrock is disintegrated into a series of diamond-shaped fault blocks of different sizes. In the early Tertiary, under the action of regional tensile stress field, violent block-break movement occurred.