Alkaline Rocks and Carbonatites of the World

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

Hvalroso (Walrus Island)

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Occurrence number: 
063-00-002
Country: 
Greenland
Location: 
Longitude: -18.8, Latitude: 74.5
Carbonatite: 
No

A specimen from a sill forming the small island of Hvalroso, southeast of Sabine O, has been described by Tyrrell (1932, p. 525 - referred to as Walrus Island). The rock is an olivine essexite of labradorite, augite, olivine, red-brown biotite and magnetite, with groundmass alkali feldspar, probable nepheline and abundant analcime.

Age: 
Tertiary.
References: 

TYRRELL, G.W. 1932. The petrography of some Kainozoic igneous rocks, and of the Cape Parry alkaline complex, East Greenland. Geological Magazine, 69: 520-7.

Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith