File:Calciocarbonatite (sovite) (Oka Carbonatite Complex, Early Cretaceous, 124-125 Ma; Oka Niobium Mine, Quebec, Canada) 1 (14636048167).jpg

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Calciocarbonatite (sövite) (6.1 cm across), dominated by whitish calcite, plus some minor brownish pyrochlore (slightly uraniferous (Na,Ca)2Nb2O6(OH,F) - a niobium ore mineral & very mildly radioactive) and blackish biotite mica + pyroxene? or amphibole? and minor blackish magnetite.

The Oka Carbonatite Complex is located in Quebec, Canada. It’s a large body of alkaline igneous rocks intruded through Precambrian metamorphics. The Oka occurs in the western part of the Canadian Shield’s Monteregian Hills Province. Published research indicates that Oka rocks cooled from magma produced by partial melting of upper mantle rocks (inferred to be metasomatized garnet lherzolites). The rocks in the complex contain some rare elements, including economic concentrations of niobium (Nb). Several mines exploit Oka rocks for their Nb content. Oka rocks include coarsely-crystalline calciocarbonatites (a.k.a. sövites; a.k.a. C1 calciocarbonatites), alnoites, ijolites, and okaites.

Age: mid-Barremian Stage, mid-Early Cretaceous, 124-125 million years.

Locality: Oka Niobium Mine, southeastern part of the Oka Hills, Oka Hills Inlier, Deux-Montagnes County, just west of Montreal & Laval, far-southern Quebec Province, southeastern Canada.
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Source Calciocarbonatite (sovite) (Oka Carbonatite Complex, Early Cretaceous, 124-125 Ma; Oka Niobium Mine, Quebec, Canada) 1
Author James St. John

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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/14636048167 (archive). It was reviewed on 1 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

1 December 2019

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current09:05, 1 December 2019Thumbnail for version as of 09:05, 1 December 20191,005 × 735 (127 KB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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