Cobalt-rich mineralizations in lenses within calcite deposits along faults in Precambrian II serpentinized ultrabasic ophiolitic rocks.
Presence of cobaltoan garnierites, formed during an early low-T hydrothermal event, in tectonic cracks of the serpentinites.
The garnierites are cross-cutted by arseniates (annabergite, haidingerite) veinlets with late filling of calcite + automorph quartz and heterogenite.
Ref.:
- http://www.crpg.cnrs-nancy.fr/NEWS/HSE-2002/HSE-PDF/elghorfi.pdf
- http://www.strahlen.org/vp/ma/aitahmane51/
- http://www.strahlen.org/vp/ma/aitahmane52/
- http://www.strahlen.org/vp/ma/aitahmane53/
- http://www.strahlen.org/vp/ma/aitahmane5459/
- http://www.strahlen.org/vp/ma/aitahmane60/