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<publisher>HAL CCSD</publisher>
<title lang=en>Structural, mineralogical, and paleoflow velocity constraints on Hercynian tin mineralization: the Achmmach prospect of the Moroccan Central Massif</title>
<creator>Mahjoubi, El Mahjoub</creator>
<creator>Chauvet, Alain</creator>
<creator>Badra, Lakhlifi</creator>
<creator>Sizaret, Stanislas</creator>
<creator>Barbanson, Luc</creator>
<creator>El Maz, Abdelkader</creator>
<creator>Chen, Yan</creator>
<creator>Amann, Méderic</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>
<description>International audience</description>
<source>Mineralium Deposita</source>
<identifier>insu-01240481</identifier>
<identifier>https://hal-insu.archives-ouvertes.fr/insu-01240481</identifier>
<source>https://hal-insu.archives-ouvertes.fr/insu-01240481</source>
<source>Mineralium Deposita, 2016, 51, pp.431-451. 〈10.1007/s00126-015-0613-0〉</source>
<identifier>DOI : 10.1007/s00126-015-0613-0</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1007/s00126-015-0613-0</relation>
<language>en</language>
<subject lang=en>Tourmaline</subject>
<subject lang=en>Structural control</subject>
<subject lang=en> Breccias</subject>
<subject lang=en>Cassiterite</subject>
<subject lang=en>Achmmach tin deposit</subject>
<subject lang=en> Hercynian Central Massif</subject>
<subject lang=en>Morocco</subject>
<subject>[SDU] Sciences of the Universe [physics]</subject>
<subject>[SDU.STU] Sciences of the Universe [physics]/Earth Sciences</subject>
<subject>[SDU.STU.TE] Sciences of the Universe [physics]/Earth Sciences/Tectonics</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>The Achmmach tin mineralization (NE of theMoroccan Central Massif) is associated with tourmaline-richalteration halos, veins, and faults hosted in sandstones andmetapelites of the Upper Visean-Namurian. These depositsare reported to be late Hercynian in age and related to theemplacement of late-orogenic granite not outcropping in thestudied area. Structural and paragenetic studies of theAchmmach tin deposit were conducted in order to establisha general model of the mineralization. From field constraints,the late Hercynian phase is marked by a transition fromtranspression to extension with deformation conditions evolvingfrom ductile to brittle environments. The transpression(horizontal shortening direction roughly trending E-W) is coevalwith the emplacement of the first tourmaline halos alongseveral conjugated trends (N070, N020, and N120).Thereafter, a tourmaline-rich breccia formed in response tothe fracturing of early tourmaline-altered rocks.Subsequently, during the extensional phase, these structureswere reactivated as normal faults and breccias, allowing theformation of the main tin mineralization (cassiterite) associatedwith a wide variety of sulfides (arsenopyrite, chalcopyrite,sphalerite, galena, pyrrhotite, bismuthinite, pyrite, and stannite). This evolution ends with fluorite and carbonate deposition.The hydrothermal fluid flow velocity, calculated byapplying statistical measures on the tourmaline growth bands,varies with the lithology. Values are lower in metapelites andhigher in breccia. In the general evolution model proposedhere, tourmaline alteration makes the rock more competent,allowing for brittle fracturing and generation of open spacewhere the main Sn mineralization was precipitated.</description>
<contributor>Committee for Integrated Action (Volubilis, N°MA/09/210) in the framework of scientific cooperation between Morocco and France.</contributor>
<date>2016</date>
</dc>
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