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地质论评  2003 

渤海湾盆地张巨河复杂断块区平面砂箱模拟实验及其启示

Keywords: 渤海湾盆地伸展盆地断层伸展构造砂箱模拟实验基底构造叠加作用

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Abstract:

伸展盆地复杂断块区往往发育多个方向的断层,这种复杂的正断层组合过去有人认为是多期构造矗加作用的结果。本文针对渤海湾盆地张巨河复杂断块区进行了平面砂箱模拟实验。实验结果表明,在基底有先存构造(如基底断裂)的情况下,如果区域伸展方向和先存断裂或基底构造活动(底辟上拱)不协调,通过递进变形就可以形成复杂的断层组合,即复杂的断层组合可以在一个伸展构造期内、在统一的区域伸展构造力作用下在递进变形过程中逐渐形成,复杂断层组合并不一定需要多期变形叠加。在此基础上,结合理论分析,提出了复杂断层组合成因的另一种模式――不协调伸展递进变形模式。该模式为揭示伸展构造系统中复杂断层组合之间的内在联系提供了新的思路。

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