Lithostratigraphy and structural framework of the Ediacaran volcano-plutonic complex of the Imiter Ag–Hg mining district (Jbel Saghro, Anti-Atlas, Morocco)

Hejja, Younes; Bourdier, Jean-Louis; Gaouzi, Abdelaziz; Baïdder, Lahssen; Tuduri, Johann; Ennaciri, Aomar; Zakir, Abdelali; Maachaa, Lhou; Zouhair, Mohammed

doi:10.1016/j.jafrearsci.2022.104687

Cited by 8 publications

(1 citation statement)

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“…These structures show strike-slip movements that reveal the existence of at least two tectonic events: first, they acted as dextral syn-kinematic with quartz veins, followed by sinistral movement syn-kinematic with barite veins. On a broad scale, E-W structures have been reported within the Saghro Group metasedimentary units in the neighboring area to the east of the studied area, especially in the Imiter, Boumalne, and Kalaat M'Gouna sub-inliers [15,18,32,37,38]. These faults were assumed to represent Ediacaran tectonic structures that were associated with an important stock of mineralization [34,39].…”

Section: Tectonic History Of the Ne Edge Of The Saghro Inliermentioning

confidence: 99%

Multiscale Structural Analysis of Ediacaran–Cambrian Rocks on the Northeastern Edge of the Saghro Inlier (Eastern Anti-Atlas): Relevance of Post-Cambrian Deformation

Yajioui,

Sant’Ovaia,

Karaoui

et al. 2023

Geosciences

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The Ediacaran–Cambrian rocks on the northeastern edge of the Saghro inlier experienced polycyclic tectono-thermal events, which are reported here based on a multiscale structural analysis, from field measurements to fluid inclusion planes. Three striking populations were identified, cutting across both the Ediacaran and Cambrian formations. These tectonic structures were generated during four tectonic events. (i) E-W-striking structures that host ore mineralized bodies (sulfide, oxide, quartz, and barite). They display a polyphase tectonic history, caused by a dextral movement in response to a NW–SE-oriented shortening, leading to the formation of quartz gashes and veins. This tectonic event took place during the Neovariscan. These E–W-striking structures were subsequently reactivated during the Mesozoic time under a sinistral strike-slip regime as a result of NE–SW shortening syn-kinematic with barite mineralization. (ii) NE–SW-striking strike-slip structures (dextral or sinistral) crosscut the E–W-striking veins. These faults are related to the NW–SE-oriented shortening that occurred during the Neogene. (iii) The last tectonic episode, related to the N–S shortening, took place during the late Neogene to the Quaternary period. It resulted in NW–SE to N–S-striking structures that were related to dextral and sinistral strike-slip movements, which crosscut the preexisting E–W structures.

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