Alkaline Rocks and Carbonatites of the World

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Asuncion Area


Occurrence number: 
Longitude: -57.05, Latitude: -25.02

Eight small plugs of olivine nephelinite ranging from 200-500 m diameter occur in the vicinity of Asuncion and up to 15 km distant. They comprise about 35% olivine, 35% pyroxene, 10-15% magnetite, 10% nepheline and a little zeolite, mostly in veins. (J.H. Palmieri, personal communication, 1981). Large inclusions of olivine are common, while very small nodules of lherzolite also occur. Names of individual plugs are Nemby, Lambare, Tacumbu, Verde, Confuso, Barcequillo, Ramirez Isla and Puerto Botanico.

J.H. Palmieri, personal communication, 1981. STORMER, J.C., GOMES, C.B. and TORQUATO, J.R.F. 1975. Spinel lherzolite nodules in basanite lavas from Asuncion, Paraguay. Revista Brasileira de Geociencias, 5: 176-85
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith