@misc{10481/107836,
year = {2025},
month = {11},
url = {https://hdl.handle.net/10481/107836},
abstract = {Co-Ni-Fe-bearing arsenide ores in the Bou Azzer district (Anti-Atlas, Morocco) occur
alongside serpentinite and are mainly found as contact-type ores or serpentinite-hosted ores.
There is a clear zoning pattern in the contact-type ores, evolving from Ni-Co ores and Co-Ni
ores filling fault-related open spaces at the serpentinite contact to Fe-Co types within the
serpentinite itself. This trend is supported by drill core geochemistry. In serpentinite-hosted
orebodies, the arsenide minerals are primarily Fe-Co ores, which preserve cores of Co-Fe ores.
Our key contribution is to identify the chemical evolution of the ore-forming fluid. Co and
Fe enrichment facilitated the progressive transition from Ni-Co to Co-Fe ores, while subsequent
Ni depletion and Fe enrichment generated the disseminated Co-Fe ores (i.e., contact-type ores).
Further circulation of these ore-forming fluids through intra-serpentinite weak fault zones tends
to precipitate Fe-Co ores surrounding Co-Fe ores (i.e., serpentinite-hosted ores). Critically, we
show that the established west-to-east district zoning (decreasing Co, increasing Ni) is specific
to contact-type ores and may be influenced by the composition of the adjacent country rock
(high Ni content is related to mafic layer in the contact. Serpentinite-hosted ores in the Ait
Ahmane area appear to follow this west-east zoning process.},
organization = {Ministerio de Ciencia, Innovación y Universidades (RTI2018-099157-A-I00)},
organization = {Ministerio de Economía y Competitividad (RYC-2015-17596 Ramón y Cajal Fellowship)},
publisher = {Elsevier},
keywords = {zoning pattern},
keywords = {Co-Ni-Fe ores},
keywords = {Bou Azzer district},
title = {An overview of the Co-Ni-Fe arsenide ore zoning in the Bou Azzer mining district (Central Anti-Atlas, Morocco)},
doi = {10.1016/j.jafrearsci.2025.105915},
author = {Hajja, Zaineb and Fanlo, Isabel and Ilmen, Said and Bendaoud, Rachida and Gervilla Linares, Fernando},
}