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3D Gravity Inversion of Northern Sinai Peninsula: A Case Study

机译：西奈半岛北部的3D重力反演：一个案例研究

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摘要

The Sinai Peninsula has attracted the attention of many geological and geophysical studies as it is influenced and bounded by major tectonic events. Those are (1) the Mesozoic to Early Cenozoic tectonically active opening of the Tethys, (2) the Late Cretaceous to Early Tertiary (Laramide) Syrian arc system, due to closing of the Tethys (3) the Oligo-Miocene Gulf of Suez rifted basin, and (4) the Late Miocene to Recent transform Dead Sea-Gulf of Aqaba rift. Additionally, the shear zones inside Sinai such as the Ragabet El-Naam and Minsherah-Abu Kandu Shear Zones. Each of these major tectonic events has affected dramatically the structure evolution of the northern Sinai area. The present paper estimates the 3D density contrast model using the gravity data of northern Sinai. The estimated 3D density contrast model elucidated the peculiarities of the main structural elements in the region. The estimated 3D density contrast model showed the high and low gravity anomalies that form the main mountains and main valleys in northern Sinai. The estimated low density zones are in agreement with the inferred faults resulting from the first horizontal derivative. Comparing the 3D model with the tectonic history of the region and the results of the first horizontal derivative and least square separation increased the reliability of the model.
机译：西奈半岛受到重大构造事件的影响和限制，因此引起了许多地质和地球物理研究的关注。这些是（1）特提斯（Tethys）中生代至早新生代构造活动的开放;（2）由于特提斯（Tethys）的关闭，晚白垩纪至早第三纪（Laramide）叙利亚弧系统（3）苏伊士的中新世-Oligo-中新世海湾裂口了盆地，以及（4）中新世晚期至最近的亚喀巴裂谷死海海湾的转变。此外，西奈半岛内的剪切带，例如Ragabet El-Naam和Minsherah-Abu Kandu剪切带。这些重大构造事件中的每一个都极大地影响了北西奈地区的结构演变。本文利用北西奈的重力数据估算了3D密度对比模型。估计的3D密度对比模型阐明了该区域主要结构元素的特殊性。估计的3D密度对比模型显示出高和低重力异常，这些异常形成了西奈北部的主要山脉和主要山谷。估计的低密度区与由一阶水平导数产生的推断断层一致。将3D模型与该区域的构造历史以及一阶水平导数和最小二乘分离的结果进行比较，可以提高模型的可靠性。

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