Alkaline Rocks and Carbonatites of the World

Setup during HiTech AlkCarb: an online database of alkaline rock and carbonatite occurrences

East Of Villarica

stripes

Occurrence number: 
130-00-026
Country: 
Paraguay
Region: 
Guaira
Location: 
Longitude: -56.3, Latitude: -25.78
Carbonatite: 
No

A 4 m thick biotite porphyry dyke cuts sandstones in an area east of Villarica and passes into a sill within the sandstones. Brown biotite phenocrysts are set in K-feldspar, (?)nepheline and opaques. On Plate 1 of Milton and Eckel (1959) other alkaline dykes are indicated in the same vicinity.

References: 
MILTON, C. and ECKEL, E.B. 1959. Igneous and metamorphic rocks. In Geology and mineral resources of Paraguay - a reconnaissance. Professional Paper, United States Geological Survey, 327: 12-50
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith