Tectonic analysis of the Dead Sea Rift Region since the Late-Cretaceous based on mesostructures
Tectonic analysis of the Dead Sea Rift Region since the Late-Cretaceous based on mesostructures
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基于细观结构的死海裂谷区晚白垩世以来构造分析
DOI：
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发表时间：
1983
期刊：
影响因子：
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通讯作者：
Z. Reches
中科院分区：
文献类型：
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作者：
Y. Eyal;Z. Reches
我们测量了以色列和西奈半岛的小断层、滑石、构造风格岩、次生矿化脉、小褶皱和岩脉的方向。这些构造是古应力或应变的指示器，并提供了构造变形的模式。130个台站收集了数据，大多数是数十个独立的测量；大多数台站显示出一致的形变。测站位于从前寒武纪结晶岩石到更新世沉积物的暴露区域。我们定义了两个构造应力场，每个应力场在时间和空间上都相对均匀。在晚白垩世至始新世，死海裂谷以西的褶皱和高原中的一个应力场，其最大水平挤压方向为W至WNW。第二个场，裂谷内部及其附近的所有岩石都以水平伸展为主，方向为E至ENE。第一个应力场被称为叙利亚弧应力，第二个应力场被称为死海应力。与这两个应力场相对应的构造变形样式的变化也在以色列的主要构造中表现出来。晚白垩世至新近纪的变形以长波褶皱和单斜为特征，而新近纪至新近纪的变形以正断层和走滑断裂及火山活动为特征。
We have measured the orientations of small faults, slickensides, tectonic stylolites, vein with secondary mineralization, small folds and dikes in Israel and Sinai. These structures are indicators of paleo-stress or strain and provide the pattern of tectonic deformation. Data were collected at 130 stations, most with tens of separate measurements; most stations showed consistent deformation. Stations were located on exposures ranging from Precambrian crystalline rocks to Pleistocene sediments. We have defined two tectonic stress fields, each relatively uniform in both time and space. One stress field, with dominating maximum horizontal compression trending W to WNW, in the Late Cretaceous to Eocene rocks in the folds and plateaus west of the Dead Sea rift. The second field, with dominating horizontal extension trending E to ENE, in all rocks inside the rift and proximal thereto. The first stress field is called the Syrian Arc stress, and the second is called the Dead Sea stress. A change in style of tectonic deformation, which corresponds to the two stress fields, is manifested also in the major structures in Israel. The Late Cretaceous to Neogene deformation is characterized by long wavelength folds and monoclines, whereas the Neogene to Recent deformation is characterized by normal and strike slip faults and volcanic activity.