Alkaline Rocks and Carbonatites of the World

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Pucallpa

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Occurrence number: 
131-00-001
Country: 
Peru
Region: 
Loreto
Location: 
Longitude: -74, Latitude: -8

At Pucallpa three small plugs are intruded into Cretaceous Vivian sandstones and are aligned northeast-southwest. The plugs comprise phonolite and alkali trachyte. The phonolites containalkali feldspar phenocrysts up to 1 cm long, groundmass alkalifelds

Age: 
K-Ar on perthite phenocrysts from phonolite gave 5.4±0.2 and 4.4±0.2 Ma (Stewart, 1971).
References: 
STEWART, J.W. 1971. Neogene peralkaline igneous activity in eastern Peru. Bulletin of the Geological Society of America, 82: 2307-12
Fig. 236 Pucallpa (after Stewart, 1971, Fig. 1).
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