摩洛哥Tazekka Variscan地块构造破裂与古应力重建:岩浆过程的意义

IF 2.1 4区 综合性期刊 Q2 MULTIDISCIPLINARY SCIENCES
Youssef Gharmane, Saïd Hinaje, Samir Amrani, Youness Taybi, Driss Yaagoub, Mohamed El Fartati
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引用次数: 0

摘要

Tazekka Variscan地块是由中新生代不整合盖层覆盖在古生代岩石上形成的,这些古生代岩石记录了与上古生代流纹熔岩和微闪长岩脉群以及上第四纪碱性玄武岩熔岩等岩浆体系侵位同时代的多期构造阶段。与古应力重建相关的细观构造和构造分析主要基于滑面断面的构造测量处理,并通过断层滑动数据反演确定了条纹节距,从而突出了以下构造-岩浆事件:(1)维桑—纳慕良期分为两个构造期。第一期以NW-SE向伸展为特征,第二期以相对较小的次水平向σ1压缩轴向NE-SW (σ1 -σ2排列)为特征。后一阶段控制了古生代岩石的构造错位和少量流纹岩熔岩流沿水下走滑断层的侵位;(ii) Stephanian-Permian时代,构造体制转变为水平NE-SW向σ1轴和水平NW-SE向σ3轴的压应力状态,导致NW-SE和NE-SW至ENE-WSW断裂发育,并充满微闪长岩脉群;(3)二叠统—中三叠统时期形成了以NNW-SSE—淹没向σ1轴和ENE-WSW—亚赤道向σ3轴为特征的水平挤压体系,形成了nne—ssw、wnw—ese断裂和淹没微闪长岩张拉裂缝。在瓦列世或下上新世,压缩向西北西东-东西方向转变。早-中第四纪分为两个构造期,呈σ1 -σ2轴排列。其轴线由NNW-SSE转变,与ENE-WSW伸展有关,以NE-SW断裂影响玄武岩熔岩为特征。潜下走滑断裂、潜下正断层和晚瓦里西世脆性构造多由玄武岩熔岩充填。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Tectonic fracturing and paleostress reconstruction in the Tazekka Variscan massif (Morocco): implications for magmatic processes

Tectonic fracturing and paleostress reconstruction in the Tazekka Variscan massif (Morocco): implications for magmatic processes
The Tazekka Variscan massif is formed by Meso-Cenozoic cover unconformably overlying the Paleozoic rocks recording polyphase tectonic stages contemporary with the emplacement of the magmatic system such as rhyolitic lavas and microdioritic dyke swarms attributed to the Upper Paleozoic tectonic phases and alkaline basaltic lavas attributed to Plio-Quaternary age. The mesostructural and tectonic analyses associated with paleo stress reconstruction are mainly based on the processing of tectonic measurement of slickensides fault planes with striation pitch determined by inversion of fault-slip data and allowed us to highlight the following tectono-magmatic events: (i) the Visean–Namurian phase is divided into two tectonic episodes. The first episode is characterized by NW–SE trending extension, while the second is marked by a relatively minor subhorizontal σ1 compressive axis oriented NE–SW (σ1–σ2 permutation). This latter episode controls the tectonic dislocation of Paleozoic rocks and the emplacement of a few rhyolitic lava flows along submeridian strike-slip faults; (ii) in the Stephanian–Permian age, the tectonic regime changes to a compressive stress state with a horizontal NE–SW trending σ1 axis and a horizontal NW–SE trending σ3 axis, which is what causes the development of NW–SE and NE–SW to ENE–WSW faults filled with microdioritic dyke swarms; (iii) the Permian–Lower-Middle Triassic period was marked by a compressive regime with a horizontal NNW–SSE to submeridian trending σ1 axis and a horizontal ENE–WSW to subequatorial trending σ3 axis, as well as NNE–SSW, WNW–ESE faults, and submeridian microdioritic tension gashes. The compression changes to WNW–ESE during the Vallesian or Lower Pliocene age. Early-Middle Quaternary is divided into two tectonic episodes with a σ1–σ2 axis permutation. Its axis changes from NNW–SSE associated with the ENE–WSW extension and is characterized by NE–SW faults affecting basaltic lavas. Subequatorial strike-slip faults, submeridian normal faults, and Late-Variscan brittle tectonic structures are mostly filled by basaltic lavas.
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来源期刊
Rendiconti Lincei-Scienze Fisiche E Naturali
Rendiconti Lincei-Scienze Fisiche E Naturali MULTIDISCIPLINARY SCIENCES-
CiteScore
4.10
自引率
10.00%
发文量
70
审稿时长
>12 weeks
期刊介绍: Rendiconti is the interdisciplinary scientific journal of the Accademia dei Lincei, the Italian National Academy, situated in Rome, which publishes original articles in the fi elds of geosciences, envi ronmental sciences, and biological and biomedi cal sciences. Particular interest is accorded to papers dealing with modern trends in the natural sciences, with interdisciplinary relationships and with the roots and historical development of these disciplines.
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