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Active tectonics and GPS data analysis of the Maghrebian thrust belt and Africa-Eurasia plate convergence in Tunisia
Tectonophysics ( IF 2.7 ) Pub Date : 2020-06-01 , DOI: 10.1016/j.tecto.2020.228440
N. Bahrouni , F. Masson , M. Meghraoui , M. Saleh , R. Maamri , F. Dhaha , M. Arfaoui

Abstract The Atlas Mountains of Tunisia belong to the seismically active zone of the Africa (Nubia) - Eurasia plate boundary in the central-western Mediterranean. We study the eastern section of the Maghrebian thrust belt using a subset (6 days) from each of 5 years (2014 to 2018) of permanent (survey-mode) GPS data and active tectonics. WNW to NNW-trending velocities express crustal motion and geodetic strain fields from the Sahara Platform to the Tell Atlas, consistent with African plate convergence. To the south, the velocities and trajectories indicate nearly WNW-ESE-trending right-lateral motion of the Sahara fault-related Atlas fold belt with respect to the Sahara Platform. Farther north and northeast, the significant decrease in velocities between the Eastern Platform (Sahel), Central Atlas and Tell Atlas and the clockwise rotation mark the NNW-trending shortening deformation associated with local ENE-WSW extension visible in the Quaternary grabens. The velocity field and strain distribution associated with the active E-W- to WNW-ESE-trending right-lateral faulting and NE-SW fault-related folds illustrate the transpression tectonics and support the identification of four tectonic domains north of the Africa-Nubia Platform in Tunisia. The transpression reduces northward when reaching the Central and Tell Atlas. These results change our perception of the Africa-Eurasia plate boundary previously located along the western Mediterranean coastline.

中文翻译:

突尼斯马格里布冲断带与非欧板块辐合的活动构造和 GPS 数据分析

摘要 突尼斯的阿特拉斯山脉属于地中海中西部的非洲(努比亚)-欧亚板块边界的地震活动带。我们使用 5 年(2014 年至 2018 年)的永久(调查模式)GPS 数据和活动构造的子集(6 天)研究马格里布逆冲带的东部。WNW 到 NNW 趋势的速度表示从撒哈拉平台到 Tell Atlas 的地壳运动和大地应变场,与非洲板块会聚一致。在南部,速度和轨迹表明与撒哈拉断层相关的阿特拉斯褶皱带相对于撒哈拉地台的近 WNW-ESE 趋势的右侧运动。向北和向东北更远的地方,东部地台(萨赫勒)、Central Atlas 和 Tell Atlas 以及顺时针旋转标志着与第四纪地堑中可见的局部 ENE-WSW 伸展相关的 NNW 向缩短变形。与活动的 EW 到 WNW-ESE 走向的右侧断层和 NE-SW 断层相关褶皱相关的速度场和应变分布说明了挤压构造,并支持在非洲 - 努比亚平台以北的四个构造域的识别突尼斯。当到达 Central 和 Tell Atlas 时,压力向北减小。这些结果改变了我们对以前位于地中海西部海岸线的非洲-欧亚板块边界的看法。与活动的 EW 到 WNW-ESE 走向的右侧断层和 NE-SW 断层相关褶皱相关的速度场和应变分布说明了挤压构造,并支持在非洲 - 努比亚平台以北的四个构造域的识别突尼斯。当到达 Central 和 Tell Atlas 时,压力向北减小。这些结果改变了我们对以前位于地中海西部海岸线的非洲-欧亚板块边界的看法。与活动的 EW 到 WNW-ESE 走向的右侧断层和 NE-SW 断层相关褶皱相关的速度场和应变分布说明了挤压构造,并支持在非洲 - 努比亚平台以北的四个构造域的识别突尼斯。当到达 Central 和 Tell Atlas 时,压力向北减小。这些结果改变了我们对以前位于地中海西部海岸线的非洲-欧亚板块边界的看法。
更新日期:2020-06-01
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