Alkaline Rocks and Carbonatites of the World

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Iruya

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Occurrence number: 
008-00-002
Country: 
Argentina
Region: 
Salta
Location: 
Longitude: -65.33, Latitude: -22.58

A tinguaite dyke about 1 m wide occurs north-northwest of Iruya, intruding Precambrian schists. The rock contains phenocrysts of sanidine, nepheline, titanaugite with rims of aegirine, a brown amphibole, olivine, sphene and magnetite in a matrix of alkali feldspar, aegirine, riebeckite, opaques, calcite, abundant analcime and zeolites.

References: 
QUARTINO, B. J. 1961. Acerca de una tanguaita de Iruya (Provincia de Salta) y de las rocas alcalinas del noroeste Argentino. Revista de la Asociacion Geologica Argentina, 15‚ 145-57.
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith