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<publisher>HAL CCSD</publisher>
<title lang=en>Structural control on tourmaline-rich alteration and Sn-mineralization in the Achmmach tin deposit (Moroccan Central Massif)</title>
<creator>Mahjoubi, El Mahjoub</creator>
<creator>Brada, Lakhlifi</creator>
<creator>CHAUVET, Alain</creator>
<creator>Sizaret, Stanislas</creator>
<creator>Barbanson, Luc</creator>
<creator>Chen, Yan</creator>
<creator>El Maz, Abdelkader</creator>
<creator>Jeffrey, Lindhorst</creator>
<creator>Chaponniere, Pierre</creator>
<contributor>Université de Moulay Ismail (UMI)</contributor>
<contributor>Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Institut des Sciences de la Terre d'Orléans - UMR7327 (ISTO) ; Bureau de Recherches Géologiques et Minières (BRGM) (BRGM) - Institut national des sciences de l'Univers (INSU - CNRS) - Université d'Orléans (UO) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Kasbah Resources ; Kasbah Resources</contributor>
<description>International audience</description>
<source>24ème RST</source>
<coverage>Pau, France</coverage>
<identifier>insu-01546927</identifier>
<identifier>https://hal-insu.archives-ouvertes.fr/insu-01546927</identifier>
<source>https://hal-insu.archives-ouvertes.fr/insu-01546927</source>
<source>24ème RST, Oct 2014, Pau, France</source>
<language>en</language>
<subject lang=en>Structural control . Shear zones . tourmalinization . tin mineralization . Achmmach . Moroccan Central Massif</subject>
<subject>[SDU] Sciences of the Universe [physics]</subject>
<type>info:eu-repo/semantics/conferenceObject</type>
<type>Poster communications</type>
<description lang=en>Tin mineralization in Achmmach deposit (NE of Moroccan Central Massif) is associated with tourmaline-rich alteration halos and faults, within N70 shear zones, hosted in sandstones and metapelites of the Upper Visean-Namurian. Such deposits were reported as late-Variscan in age and related to the emplacement of late orogenic granite not outcropping in the studied area.From field constraints, it appears that the late Variscan phase is marked by a transition from transpression to extension with conditions of deformation evolving from ductile to brittle environments. During the transpressive phase (horizontal shortening direction roughly trending E-W), pervasive tourmaline is deposited under the form of metasomatic halos around fractures in the upper levels relative to the deep batholith. This hydrothermal activity is coeval with ductile shear zones within a large corridors trending N70. Tourmaline-rich alteration appears as a hardening stage contributing to the modification of the tectonic style of rocks. Thereafter, a strong brecciation occurs in response of re-using and re-opening of the strike-slip structure. The result is (1) the formation of dextral (N070, N020) and sinistral (N120) shears, and (2) the circulation of fluids within early tourmalinites and formation of tourmaline-rich breccia. Subsequently, during the late orogenic extensional phase, tourmalinite breccias reopened as normal faults acting as overpressure fluid pathways for developing other breccias and veins. Such event is marked by deposition of tin mineralization i.e., cassiterite followed by sulphides, and then fluorite and carbonates at the end.From analysis of the shear-zone structure and superimposition of tourmalines and tin mineralization in the same structures, it is possible to suggest a structural control continuum. Such control is well expressed during metasomatism and deposition of hydrothermal tourmaline under the transpressive phase. Thereafter, under the extensive phase allowing open-space, tin-mineralization were trapped.This study has been supported by AI MA/09/210</description>
<date>2014-10-27</date>
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