Paleostress Analysis of the Cretaceous Rocks in Northern Jordan
Paleostress Analysis of the Cretaceous Rocks in Northern Jordan
复制标题
约旦北部白垩纪岩石的古应力分析
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
A. Diabat
中科院分区：
文献类型：
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作者：
N. Khatib;A. Diabat
使用改进的右二面角方法，然后进行旋转优化（WINTENSOR程序，Delvaux，2006），对747个断层滑动数据进行应力反演。断层滑动数据，包括断层面，条纹和运动方向，是从Turonian Wadi As Sir组的采石场，分布在研究区的北方约旦的14个站。主应力轴方向（σ1、σ2、σ3）和主应力差比值（R）表明，在15个古应力张量中，有9个张量σ1（SHmax）和σ3（SHmin）基本上呈近水平状态，σ2呈近垂直状态，属于一个主要的走滑系统，σ1沿北北西方向摆动。四个应力张量分别为σ2（SHmax）、σ1垂向和σ3 NE向。这种情况被解释为在构造事件期间发生的应力轴σ1和σ2的排列。新的古应力结果显示了三种古应力状态，分属于两个主应力场。第一种以E-W向WNW-ESE压缩和N-S向NNE-SSW扩展为特征。这种应力场与始于土仑期的叙利亚弧褶皱带的形成有关。第二个古应力场表现为NW-SE-NNW-SSE挤压和NE-SW-ENE-WSW伸展。它与中中新世-近代沿死海变换沿着的左旋运动和红海的打开有关。
Stress inversion of 747 fault- slip data was performed using an improved Right-Dihedral method, followed by rotational optimization (WINTENSOR Program, Delvaux, 2006). Fault-slip data including fault planes, striations and sense of movements, are obtained from the quarries of Turonian Wadi As Sir Formation , and distributed over 14 stations in the study area of Northern Jordan. The orientation of the principal stress axes (σ1, σ2, and σ3 ) and the ratio of the principal stress differences (R) show that σ1 (SHmax) and σ3 (SHmin) are generally sub-horizontal and σ2 is sub-vertical in 9 of 15 paleostress tensors, which are belonging to a major strike-slip system with σ1 swinging around NNW direction. Four stress tensors show σ2 (SHmax), σ1 vertical and σ3 are NE oriented. This situation is explained as permutation of stress axes σ1 and σ2 that occur during tectonic events. The new paleostress results show three paleostress regimes that belong to two main stress fields. The first is characterized by E-W to WNW-ESE compression and N-S to NNE –SSW extension. This stress field is associated with the formation of the Syrian Arc fold belt started in the Turonian. The second paleostress field is characterized by NW-SE to NNW-SSE compression and NE-SW to ENE-WSW extension. It is related to Middle Miocene – Recent sinistral movement along the Dead Sea transform and the opening of the Red Sea.