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褶皱岩层高角度斜交构造裂缝的形成机制

DOI: 10.16539/j.ddgzyckx.2015.04.005, PP. 610-615

Keywords: 褶皱,高角度斜交,构造裂缝,主应变轴,形成机制

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Abstract:

构造裂缝的发育往往与褶皱、断层等构造密切相关,本文对钱塘坳陷南缘富阳?临安地区褶皱岩层中的同褶皱裂缝进行了研究。在褶皱翼部多发育与层面斜交的构造裂缝,具体表现为与层面高角度斜交构造裂缝较为发育,而与层面低角度相交的构造裂缝发育较少或不发育。其中,与层面高角度斜交的构造裂缝的特征与层间剪切作用下形成的裂缝特征不同。分析认为岩层褶皱初期主应变轴与层面平行或直交,在岩层褶皱变形过程中,主应变轴与层面高斜交。岩层外弧受到与层面不平行的拉伸,而内弧则受到与层面不平行的压缩作用。本文认为褶皱过程中应变轴的变化是导致岩层中形成与层面高角度斜交构造裂缝的主要原因。

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