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File:Ferrocarbonatite (Ice River Complex, Early Mississippian, ~356 Ma; Ice River Intrusion, southeastern British Columbia, Canada).jpg

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English: Ferrocarbonatite (8.1 cm across) from the Ice River Complex of British Columbia.

This is ferrocarbonatite, an uncommon variety of carbonatite. Traditionally, this rock type is simply characterized by having a high-iron content compared with calciocarbonatites. The main carbonate mineral of ferrocarbonatites is (or is supposed to be) iron-rich (versus the rock being merely hematitic or magnetitic). Iron-rich carbonate minerals documented in ferrocarbonatites include siderite (FeCO3), ankerite (CaFe(CO3)2), and ferroan dolomite (Ca(Mg,Fe)(CO3)2). What about hematitic carbonatites, or magnetitic carbonatites, or carbonatites rich in iron silicate minerals? These are called ferruginous carbonatites (see Gittins & Harmer, 1997).

The ferrocarbonatite shown here has calcite, ankerite, siderite, iron oxides and iron silicates (Peterson & Currie, 1994). It comes from British Columbia’s Ice River Complex. The Ice River is an 18-kilometer long, 29-square kilometer, backward J-shaped alkaline igneous intrusion emplaced in Cambro-Ordovician passive-margin limestones and shales.

Age: ~356 million years (Tournaisian Stage, Early Mississippian)

Locality: Ice River Intrusion, southeastern British Columbia, eastern Cordillera, southwestern Canada.

References cited: Peterson & Currie (1994) - The Ice River Complex, British Columbia. Geological Survey of Canada Current Research 1994-A: 185-192

Gittins & Harmer (1997) - What is ferrocarbonatite? A revised classification. Journal of African Earth Sciences 25: 159-168.
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Source https://www.flickr.com/photos/47445767@N05/14842513313/
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@N05/14842513313. It was reviewed on 11 October 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

11 October 2020

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