ultramafic rocks are essentially constituted by silicates of magnesium: forsterite, and/or diopside-enstatite; who’s the most common hydrothermal alteration are the serpentinization. to bou azzer, the serpentinisation affected almost all of the ultrabasic rocks. among the phenomena bound to the serpentinisation observed on the ground, we distinguish the magnesium deposits (carbonated serpentini...

the serpentinization of the harzburgitic mantle section of the bou azzer neoproterozoic ophiolite is studied by field mapping, structural observations, optical micrography, sem and x-ray diffractometry, and relationships with co, ni, cr and sulphides minerals are discussed. serpentinization occurred in two major steps with, i) intra-oceanic pseudomorphic serpentinization materialized by the iso...

The Neoproterozoic Bou Azzer ophiolite in the Moroccan Anti-Atlas Panafrican belt hosts numerous chromitite orebodies within peridotite section of oceanic mantle. chromitites are strongly affected by serpentinization and metamorphism, although they still preserve igneous relicts amenable for petrogenetic interpretation. major, minor trace element composition unaltered chromite cores reveal two ...

The Bou Azzer district in the central Anti-Atlas of Morocco is world’s unique mining where Co exploited from serpentinite-hosted hydrothermal Co-Ni-Fe arsenide ores. This paper provides first-ever mineralogical and geochemical characterization a suite Fe-rich orebodies found during recent Ait Ahmane area, district. These are lens-like massive disseminated ores fully hosted serpentinites (hereaf...

Purpose.The purpose of this paper is to study the characteristics carbonate serpentines present at level Ait Ahmane site (Bou Azzer Mine, Morocco). Empirical methods are suitable for analyzing their behavior and determining dimensions support types. Methods. The rock mass different structures mentioned in categorized using empirical such RMR, Q-system AFTES classifications. Findings. It has bee...

The two main types of mineralisation in the Co-Ni-As Bou Azzer district, i.e., “contact” mineralisation” and “cross-cutting” structures have been re-defined based on new field, structural, textural mineralogical observations. orebodies consist elongated lenses massive Ni-Co-Fe arsenide minerals. These occur a core carbonate or siliceous gangue are almost exclusively located along contact betwee...

The Bou Azzer district in Morocco has a long mining history since the beginning of XXst century during which it become only world producer Co from primary, hydrothermal arsenide ores. Orebodies are structurally controlled, and mainly distributed along fault contacts between Cryogenian ophiolite-related serpentinite bodies intrusive quartz diorite or, locally, ophiolitic gabbros or Ediacaran vol...