Bulletin du Service Géologique de l'Algérie
Volume 34, Numéro 1, Pages 77-92
2026-06-30
Perrierite-(ce) In The Archean Alkaline Orthogneiss Of The Khanfous Area (in Ouzzal Terrane, Nw Hoggar)
Authors : Harouz Chakib . Ouzegane Khadidja . Doukkari Sidali .
Abstract
Chevkinite-group minerals, including chevkinite-(Ce) and perrierite-(Ce), are rare Fe–Ti silicates characterized by their ability to incorporate incompatible trace elements, particularly the light rare earth elements (LREE). The systematic LREE enrichment, coupled with restricted chemical variability, indicates crystallization of perrierite-(Ce) from differentiated alkaline magmas, with its primary chemical signature preserved during subsequent ultra–high-temperature metamorphism. This study presents new data on the occurrence and mineral chemistry of perrierite-(Ce) identified in high-grade alkaline orthogneisses from the Khanfous area in central Tekhamalt, located within the In Ouzzal terrane of the Western Hoggar (Algeria). The analyzed compositions confirm the presence of perrierite-(Ce), with dominant LREE occupancy at the A site (Ce > La > Nd), Fe²⁺ at the B site, and Ti occupying both the C and D sites. The perrierite-(Ce) from Tekhamalt displays pronounced enrichment in LREE, with chondrite-normalized patterns exhibiting (La/Nd) ratios ranging from 2.1 to 6.4, and marked compositional heterogeneity. These findings provide important geochemical constraints on the stability and crystallization characteristic of chevkinite-group minerals under ultra–high-temperature metamorphic conditions.
Keywords
Perrierite – (Ce) ; Orthogneiss ; REE ; Hoggar ; Tekhamalt
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