里德尔剪切的组合型式与走滑盆地组合型式的相似性

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走滑断裂体系中经常发育里德尔剪切的断裂组合,世界上不同构造背景下与走滑断裂相关的盆地(走滑盆地)也很多见。因此里德尔剪切是地质构造研究中的重要方面。我们从三个方面对里德尔剪切的节理构造组合及盆地组合进行了对比:(1)里德尔剪切构造组合与比例尺无关。里德尔剪切带的(转换)拉张区与沉积盆地的分布区是相似的;(2)断裂的最大位移区与断陷盆地的沉积中心是一致的,断陷盆地长轴平行于断裂走向;(3)物理模拟试验及数学模拟试验都证实了走滑盆地的演化。基于上述认识,我们通过厘米级岩芯标本的观察,结合已发表的盆地资料,提出了6类与里德尔剪切有关的构造组合及断陷盆地组合。(1)雁列状构造及盆地组合:许多盆地发育雁列状构造。同时,与里德尔剪切相关的雁列状盆地的宽度与主剪切断裂的剪切位移呈正相关。(2)帚状或马尾状构造及盆地组合:二者在形态上相似,所以归为一类。成因上,马尾状构造及盆地主要发育在走滑断裂的拉张端部,而帚状构造或盆地反映走滑断裂的旋扭作用,可以在走滑断裂影响区域的任何部位。(3)串珠状构造及盆地组合:该类型的盆地主要是指释压盆地的组合,拉分盆地也可以形成串珠状盆地。(4)S状或Z状构造或盆地组合:左行走滑形成Z状构造或盆地,而右行走划形成S状构造或盆地。(5)多字型构造及盆地组合:是拉分盆地的典型组合,可以过渡到串珠状盆地。(6)复杂的网状构造及盆地组合:通常是由于分布型简单剪切的作用结果。以上盆地组合类型包括大型盆地内次级单元(次级盆地或更次级盆地)的组合,但不包括多成因、多期活动的构造及盆地。 In the strike-slip faulting system, the Ridge shear fault assemblages are frequently developed. Basins (strike-slip basins) related to strike-slip faults under different tectonic settings in the world are also widely seen. Therefore, Riddle shear is an important aspect in the study of geological structure. We compare the Ridgell shear jointed assemblages and basin assemblages in three aspects: (1) The combination of Riddle shear structures has nothing to do with the scale. The area of ​​the (converted) pull zone of the Riddle shear zone is similar to that of the sedimentary basin; (2) the maximum displacement zone of the fault coincides with the sedimentary center of the faulted basin, and the long axis of the fault basin is parallel to the strike of the fault ; (3) Both physical simulation experiments and mathematical simulation tests confirm the evolution of the strike-slip basin. Based on the above understanding, we propose six types of tectonic assemblages and rift basin assemblages related to Riddle shear through the observation of centimeter-level core samples and the published basin data. (1) Yan geosyncline structure and basin assemblage: Echelon structure developed in many basins. At the same time, the width of the echelon basin associated with Riddle shear is positively correlated with the shear displacement of the main shear fault. (2) broom-like or cauda equina structure and basin combination: the two are morphologically similar, so classified as a class. Originally, the cauda equina structure and basins are mainly developed at the extremity of strike-slip faults, while the broom-like structures or basins reflect the spin-slip action of strike-slip faults and can occur at any part of the strike-slip fault zone. (3) Beaded structure and basin combination: This type of basin mainly refers to the combination of pressure relief basins, and the pull-apart basin can also form a beaded basin. (4) S-shaped or Z-shaped structure or combination of basins: the left slip forms a Z-shaped structure or basin while the right walk forms a S-shaped structure or basin. (5) Multi-word structure and basin combination: It is a typical combination of pull-apart basin that can transition to beaded basin. (6) complex mesh structure and basin combination: usually due to the distribution of simple shear effect. The above types of basin assemblages include a combination of secondary units (sub-basins or sub-basins) in large basins, but do not include multi-generative, multi-period structures and basins.
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