ABSTRACT
Organic matter and clay mineral assemblage anomalies surround the deposits of Touissit-Bou Beker Mississippi Valley-type deposits. The organic matter reflectance (R0) shows a decrease in R0 values toward the deposits; within the deposits, the lowest R0 values are related to the higher-grade ore zones. Clay mineral assemblages also exhibit concentric halos around the ore-bodies. Organic matter and clay mineral assemblages zonations are interpreted to have been formed during the precipitation of sulfides and the subsequent reactions between the host rocks and the post-ore fluids. Therefore, the use of organic matter and clay mineral assemblages should complement traditional exploration techniques constituting a valuable tool in prospecting Mississippi Valley-type deposits of Morocco.
