Unravelling the Temporal and Chemical Evolution of a Mineralizing Fluid in Karst-Hosted Deposits: A Record from Goethite in the High Atlas Foreland (Morocco)

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License: CC BY 4.0
Serval ID
serval:BIB_A6D392358973
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Unravelling the Temporal and Chemical Evolution of a Mineralizing Fluid in Karst-Hosted Deposits: A Record from Goethite in the High Atlas Foreland (Morocco)
Journal
Minerals
Author(s)
Verhaert Michèle, Gautheron Cécile, Dekoninck Augustin, Vennemann Torsten, Pinna-Jamme Rosella, Mouttaqi Abdellah, Yans Johan
ISSN
2075-163X
Publication state
Published
Issued date
11/09/2022
Peer-reviewed
Oui
Volume
12
Number
9
Pages
1151
Language
english
Abstract
Timing and duration of ore deposit formation are crucial to understanding the mineralization process. To address this, the geochronological (U-Th)/He method, geochemical and H- and O-isotope compositions of pure goethite formed in the Imini karst-hosted Mn district (High Atlas, Morocco) were examined in detail. Two main generations of cavity-filling and fracture-filling goethite are identified, and both precipitated prior to the massive Mn oxide ore. The δD and δ18O values reveal that the mineralizing fluid of cavity and fracture-filling goethite is meteoric-derived but enriched in 18O due to fluid–rock interactions with the host rock dolostone or mixing with O2-rich surface water resident in an open karst system. The cavity-filling goethite precipitated between 95 to 80 Ma, whereas fracture-filling goethite formed between 80 to 50 Ma. Ore deposition occurred discontinuously during the early Atlas doming associated with one or more early compressional events in the Atlas tectonism. The increase in δD values and depletion in U content result from a change in the mineralizing fluid within the karst system. At about 50 Ma, the fluid is notably enriched in U, Cu and trace metals.
Keywords
Geology, Geotechnical Engineering and Engineering Geology
Web of science
Open Access
Yes
Create date
04/10/2022 11:16
Last modification date
05/01/2023 7:13
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