Tectonic reevaluation of West Cameroon domain: Insights from high-resolution gravity models and advanced edge detection methods

IF 2.1 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Journal of Geodynamics Pub Date : 2024-10-18 DOI:10.1016/j.jog.2024.102061
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Abstract

The West Cameroon region, characterized by a diverse geomorphology of highlands and plains resulting from tectonic processes across different geological ages, has been extensively explored for natural resources. Recognizing the significance of its tectonic and magmatic features associated with seismic and volcanic activity, this study focuses on geodynamic investigations of the Cameroon Volcanic Line (CVL). Despite previous efforts, detailed structural geophysical studies of the West Cameroon domain have proven inconclusive, prompting a comprehensive structural reinterpretation. Utilizing the high-resolution SGG-UGM-2 satellite gravity model and innovative processing techniques, including the horizontal gradient of a modified tilt (HGSTDR), the balanced horizontal gradient (BHG), the tilt of the horizontal gradient (TAHG), the improvised horizontal gradient tilt angle (impTAHG), and the Tilt Depth method, our research aims to enhance the interpretational quality of tectonic lineaments. By separating regional and residual anomalies in the Bouguer gravity map and applying a combination of filters to delineate geological units, the BHG filter emerges as a robust tool that highlights subsurface edges without generating false features. This approach unveils previously undetected NNW-SSE-oriented lineaments, confirming the presence of deep fractures and faults in Bafoussam, Nkongsamba, and along the Benue Trough, corroborated by newly discovered NNW-SSW trending lineaments. The study suggests that the region’s topography is overcompensated by deep mountain roots and compressive tectonism. Digitizing the BHG filter produces a structural map, revealing predominant NE trends in identified geological margins, including NNE-SSW, N-S, NW-SE, E-W, and NE-SW directions. Geological contacts between granite and high-grade gneiss are indicated by NNW-SSE and NNE-SSW trending lineaments along the Benue Trough. These results contribute significantly to the understanding of the tectonic setting of the West Cameroon Domain.
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重新评估喀麦隆西部地区的构造:高分辨率重力模型和先进边缘探测方法的启示
西喀麦隆地区的特点是不同地质年代的构造过程造成的高地和平原的多样化地貌,该地区的自然资源已被广泛勘探。认识到与地震和火山活动相关的构造和岩浆特征的重要性,本研究侧重于喀麦隆火山线(CVL)的地球动力学调查。尽管之前做了大量工作,但对西喀麦隆地区进行的详细构造地球物理研究仍未得出结论,因此需要对该地区进行全面的构造重新解释。利用高分辨率 SGG-UGM-2 卫星重力模型和创新的处理技术,包括修正倾斜的水平梯度(HGSTDR)、平衡水平梯度(BHG)、水平梯度倾斜(TAHG)、简易水平梯度倾斜角(impTAHG)和倾斜深度法,我们的研究旨在提高构造线形的解释质量。通过分离布格尔重力图中的区域异常和残余异常,并应用滤波器组合来划分地质单元,BHG 滤波器成为一种强大的工具,它能突出地下边缘,而不会产生错误特征。这种方法揭示了以前未发现的 NNW-SSE 走向线型,证实了巴富萨姆、恩孔桑巴和贝努埃海槽沿线存在深层断裂和断层,新发现的 NNW-SSW 走向线型也证实了这一点。研究表明,该地区的地形被深山根系和压缩构造所过度补偿。通过对 BHG 滤波进行数字化处理,绘制了一张构造图,揭示了已确定地质边缘的主要东北走向,包括 NNE-SSW、N-S、NW-SE、E-W 和 NE-SW 走向。贝努埃海槽沿线的 NNW-SSE 和 NNE-SSW 走向线状显示了花岗岩和高品位片麻岩之间的地质接触。这些结果极大地促进了人们对西喀麦隆域构造背景的了解。
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来源期刊
Journal of Geodynamics
Journal of Geodynamics 地学-地球化学与地球物理
CiteScore
4.60
自引率
0.00%
发文量
21
审稿时长
6-12 weeks
期刊介绍: The Journal of Geodynamics is an international and interdisciplinary forum for the publication of results and discussions of solid earth research in geodetic, geophysical, geological and geochemical geodynamics, with special emphasis on the large scale processes involved.
期刊最新文献
Unveiling crustal deformation patterns along the north Tabriz fault from 2015 to 2022 using multi-temporal InSAR analysis Alternative thermal histories of Earth-like planets: Influence of key parameters Tectonic reevaluation of West Cameroon domain: Insights from high-resolution gravity models and advanced edge detection methods Insights into the crustal and the magmatic feeding structure at the Payunia Volcanic Province highlighted by geophysical methods, in the retroarc of the Southern Central Andes Artificial intelligence for assessing the planets' positions as a precursor to earthquake events
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