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

Cerro Guazu

stripes

Occurrence number: 
130-00-008
Country: 
Paraguay
Region: 
Amambay
Location: 
Longitude: -56, Latitude: -23

An intrusion of essexite containing syenite veins and emplaced in Jurassic sandstones (J.H. Palmieri, personal communication, 1981), but described on a map of Mariano and Druecker (personal communication, 1985) as 'fenitized shonkinite' and with a radial swarm of lamprophyre dykes.

Age: 
K-Ar on biotite from shonkinite gave 117±4 Ma (Mariano and Druecker, personal communication, 1985).
References: 
MARIANO, A.N. and DRUECKER, M.D. 1985. Alkaline igneous rocks and carbonatites of Paraguay. Abstracts with Programs, Geological Society of America, 17: 166. MARIANO, A.N., personal communication, 1985. PALMIERI, J.H., personal communication, 1981
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith