Petrology, geochemistry, stable and radiogenetic isotopy of the Guelb Moghrein iron oxide copper gold cobalt deposit, Mauritania
type: CreativeWork
description: The Guelb Moghrein Fe oxide-Cu-Au-Co deposit is located in the central Mauritanides fold and- thrust belt, in the Akjoujt region, northern Mauritania. The deposit is hosted by an Archean metavolcanosedimentary sequence at the western boundaries of the West African Craton. Sericite-quartz- and biotite garnet-quartz schists that belong to the Saint Barbe Volcanic unit make up the stratigraphic base of the lithological sequence in the pit. The sericite-quartz schist represents a metatuff of rhyodacite to rhyolite composition and the biotite-garnet-quartz schist is an intercalating metapelite. A suite of metavolcanic rocks of the Akjoujt Metabasalt unit including massive amphibolite lenses, biotite-actinolite- and chlorite schists dominate the deposit area. Textural and geochemical analyses indicate that the precursor volcanic rocks are submarine, andesites/basalts crystallized in a volcanic arc/continental margin setting. The Fe oxide-Cu-Au-Co mineralization is hosted by a lensoid metacarbonate body in the central part of the pit area. The metacarbonate is a massive, very coarse-grained rock, consisting of up to 5 cm large siderite crystals. A line of evidence including geochemical and stable isotopic signature of the siderite indicates that the metacarbonate represents marine metasediment deposited in a continental shelf setting. Thermobarometric analyses on the regional lithologies record a clockwise retrograde P-T path subsequent to thrust deformation events. Peak, amphibolite facies metamorphism for the amphibolite of the Akjoujt Metabasalt unit was calculated at 580 ±40°C and 5 kbar. Retrograde shearing of the amphibolite during the northeastward D2 regional thrust event resulted in the development of the S2 foliation and the formation of the biotite-actinolite schist. This retrograde overprint occurred at 410 ±30°C and ca. 3 kbar. The D2 event resulted in overthrusting of the Akjoujt Metabasalt unit by the Saint Barbe Volcanic unit as well as the IOCG hydrotherma…
abstract: The Guelb Moghrein Fe oxide-Cu-Au-Co deposit is located in the central Mauritanides fold and- thrust belt, in the Akjoujt region, northern Mauritania. The deposit is hosted by an Archean metavolcanosedimentary sequence at the western boundaries of the West African Craton. Sericite-quartz- and biotite garnet-quartz schists that belong to the Saint Barbe Volcanic unit make up the stratigraphic base of the lithological sequence in the pit. The sericite-quartz schist represents a metatuff of rhyodacite to rhyolite composition and the biotite-garnet-quartz schist is an intercalating metapelite. A suite of metavolcanic rocks of the Akjoujt Metabasalt unit including massive amphibolite lenses, biotite-actinolite- and chlorite schists dominate the deposit area. Textural and geochemical analyses indicate that the precursor volcanic rocks are submarine, andesites/basalts crystallized in a volcanic arc/continental margin setting. The Fe oxide-Cu-Au-Co mineralization is hosted by a lensoid metacarbonate body in the central part of the pit area. The metacarbonate is a massive, very coarse-grained rock, consisting of up to 5 cm large siderite crystals. A line of evidence including geochemical and stable isotopic signature of the siderite indicates that the metacarbonate represents marine metasediment deposited in a continental shelf setting. Thermobarometric analyses on the regional lithologies record a clockwise retrograde P-T path subsequent to thrust deformation events. Peak, amphibolite facies metamorphism for the amphibolite of the Akjoujt Metabasalt unit was calculated at 580 ±40°C and 5 kbar. Retrograde shearing of the amphibolite during the northeastward D2 regional thrust event resulted in the development of the S2 foliation and the formation of the biotite-actinolite schist. This retrograde overprint occurred at 410 ±30°C and ca. 3 kbar. The D2 event resulted in overthrusting of the Akjoujt Metabasalt unit by the Saint Barbe Volcanic unit as well as the IOCG hydrotherma…
author: Sakellaris, Grigorios Aarne
language: eng
keywords: info:eu-repo/classification/ddc/550, Erzmineralien, Mauretanien, Gold, Gesteinskunde, Geowissenschaften, Alteration, Monazite, ore, Mauritania
date published: 2007
date modified: 2026-07-30T19:43:28Z
provider: RWTH Aachen University
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: Publikationsserver der RWTH Aachen University