Alkaline Rocks and Carbonatites of the World

Funded by HiTech AlkCarb - New geomodels to explore deeper for Hi-Tech critical raw materials in Alkaline rocks and Carbonatites

Troquoi

stripes

Occurrence number: 
080-00-006
Country: 
Italy
Location: 
Longitude: -6.62, Latitude: 5.83

A number of syenite and quartz syenite intrusions of an alkaline character are described as of ‘Mont Troquoi type’ (Papon, 1973). Six such intrusions, all emplaced in Precambrian gneiss or migmatite, are indicated on the 1:500,000 geological map accompanying Papon’s (1973) paper. Three comprise the Mont Troquoi massif, each of which is two to four kilometres in diameter, with rather smaller bodies several kilometres to the south and west and a much bigger 6x8 km intrusion 5 km north of Mont Troquoi. All the intrusions are of syenite with some facies containing quartz. They comprise microcline, albite, aegirine-augite, which is generally associated with arfvedsonite, biotite and accessories. Six rock analyses are given by Papon (1973).

Age: 
Rb-Sr on microcline and whole rock gave 1587(75 Ma (Papon, 1973).
References: 
PAPON, A. 1973. Géologie et minéralisations du Sud-Ouest de la Côte-d’Ivoire. Synthèse des travaux de l’opération SASCA 1962-1968. Mémoires du Bureau de Recherches Géologiques et Minières, 80: 1-286.
Location: 
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith