Process of serpentinization in the ultramafic mass

Authors: Zaineb Hajjar Amina Wafik Marc Constantin Mohamed Bhilisse

Publish Date: 2016/05/23

Volume: 9, Issue: 6, Pages: 471-

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Abstract

The Beni Bousera massif forms part of the Sebtide units in the internal Rif Mountain Morocco It is mainly composed of mantle peridotites surrounded by crustal metamorphic rocks kinzigites micaschists and schists The serpentinization affects all of peridotite massif to various degrees Serpentinization is concentrated at the top of the peridotites along the mylonitized zone and in the NE part of the massif It is manifested by the formation of mesh and hourglass textures along the tectonic foliation in the highly serpentinized peridotites and brecciated texture in the least serpentinized peridotites Pyroxene minerals are still intact hosting few serpentine veins These petrographic features are consistent with the geochemical data marked by the increasing of LOI and decreasing of MgO and FeO toward the top of the massif and Aaraben fault The Raman characterization of serpentine with the brecciated mesh and hourglass textures correspond to lizardite type whereas the serpentine with the vein texture is formed by lizardite + chrysotileThis paper forms part of PhD thesis of the first authors It has received CNRST funding under the program of development of Sectarian Research RS/2011/28 project The authors would like to acknowledge Pr Michel Dubois from Laboratoire de Génie Civil et de GéoEnvironnement Lille 1 University France for permitting us to do Raman Spectroscopy study in his laboratory We would like to acknowledge also Didi Ould Mokhtar and an anonymous reviewer for their constructive comments

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