Triaxial stress state deep in orogenic belts: an example from Turkey
Triaxial stress state deep in orogenic belts: an example from Turkey
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DOI：
10.1016/j.jsg.2004.06.005
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发表时间：
2004-12
影响因子：
3.1
通讯作者：
T. Masuda;S. Nakayama;N. Kimura;K. Onodera;A. Okamoto
中科院分区：
文献类型：
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作者：
T. Masuda;S. Nakayama;N. Kimura;K. Onodera;A. Okamoto
一种罕见的变角闪石卵石，其中含有具有广泛取向的微布丁结构的角闪石颗粒，为在面理表面的两个垂直方向上进行应力分析提供了机会。用微束形成法对试件进行分析，以推断微束形成过程中的三轴应力状态。确定了钠基角闪石颗粒在这两个方向上的应力参数与远场差应力成正比。计算出两个正交位向(σ1−σ2)/(σ1−σ3)的应力比为0.6 4，表明σ2比σ3更接近σ1和σ3之间的中点。
A rare metachert pebble containing amphibole grains with microboudin structures in a wide range of orientations provides an opportunity to perform stress analysis in two orthogonal orientations on the foliation surface. The sample was analysed by the microboudin method to infer the triaxial stress state during microboudinage. Stress parameters proportional to the far-field differential stress were determined for sodic amphibole grains in the two orientations. The ratio of the stresses in the two orthogonal orientations (σ1−σ2)/(σ1−σ3) was calculated to be 0.64, indicating that σ2lies closer to the midpoint between σ1and σ3than to σ3.