Aeromagnetic mapping and geodynamic reconstruction of the Ediacaran Najd fault system in the Arabian Shield

IF 8.9 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Gondwana Research Pub Date : 2026-05-01 Epub Date: 2025-12-13 DOI:10.1016/j.gr.2025.11.019

Moujahed Al-Husseini , Ian C.F. Stewart

引用次数: 0

Abstract

Three major NW-trending fault zones are assigned to the Ediacaran Najd fault system in the exposed Proterozoic Arabian Shield of Saudi Arabia. The total left-lateral displacement along the three zones has been previously interpreted as ca. 250 km, and to project from the southeastern edge of the Arabian Shield to beneath the Phanerozoic cover rocks in Saudi Arabia. In this article, aeromagnetic and geological maps, geochronological data, and structural evidence are integrated in a new Ediacaran tectonic framework of the Arabian Shield. It indicates only the middle branch of Najd system, the Ar Rika–Qazaz, constitutes a major strike-slip fault zone with a left-lateral displacement ranging between 55 and 80 km as estimated at several locations. The fault zone became active at ca. 620/615 Ma when it broke across the NS-oriented collisional front of the Amar orogeny and ceased to move by ca. 560 Ma, or possibly later.

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阿拉伯地盾埃迪卡拉系纳伊德断裂系统的航磁填图与地球动力学重建

在出露的沙特阿拉伯元古界阿拉伯地盾中，划分出三个主要的北西向断裂带。沿着这三个区域的总左移量已被解释为约250 公里，并从阿拉伯地盾的东南边缘投射到沙特阿拉伯显生宙盖层之下。在这篇文章中，航磁和地质图、地质年代数据和构造证据被整合到一个新的埃迪卡拉纪阿拉伯盾构造框架中。它表明只有Najd系统的中间分支，即Ar Rika-Qazaz，构成了一个主要的走滑断裂带，据估计在几个地点的左移量在55至80 公里之间。该断裂带在大约620/615 Ma时开始活跃，当时它穿过阿玛尔造山运动的ns向碰撞前沿，并在大约560 Ma或更晚的时候停止运动。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Gondwana Research 地学-地球科学综合

CiteScore

12.90

自引率

6.60%

发文量

298

审稿时长

65 days

期刊介绍： Gondwana Research (GR) is an International Journal aimed to promote high quality research publications on all topics related to solid Earth, particularly with reference to the origin and evolution of continents, continental assemblies and their resources. GR is an "all earth science" journal with no restrictions on geological time, terrane or theme and covers a wide spectrum of topics in geosciences such as geology, geomorphology, palaeontology, structure, petrology, geochemistry, stable isotopes, geochronology, economic geology, exploration geology, engineering geology, geophysics, and environmental geology among other themes, and provides an appropriate forum to integrate studies from different disciplines and different terrains. In addition to regular articles and thematic issues, the journal invites high profile state-of-the-art reviews on thrust area topics for its column, ''GR FOCUS''. Focus articles include short biographies and photographs of the authors. Short articles (within ten printed pages) for rapid publication reporting important discoveries or innovative models of global interest will be considered under the category ''GR LETTERS''.