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File:Kimberlite (Lomonosovskaya Pipe, Late Devonian; Arkhangelsk Region, Russia) 2.jpg

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Description
English: Kimberlite from the Devonian of Russia.

This kimberlite sample is from an exploratory drill core in a diamondiferous pipe in northwestern Russia. It has abundant serpentinized olivine (= greenish masses).

Sample description by a Russian diamond exploration geologist (I'm not 100% sure who it was):

Autolith kimberlite breccia, Lomonosovskaya Pipe, Zolotitskoye Field.

Microcrystalline structure. Breccia is characterized by presence of serpentine pseudomorphs of olivine of the first and second generation in quantity from 40 to 80% (olivine-I predominates), autoliths - up to 10%, xenogenic material - up to 5-10% (quartz grains and argillite and aleurolite fragments). The cement mass consists of saponite or serpentine-saponite aggregates. Among diamond-satellite minerals, there occur chrome-spinellid (60 grams/ton), chrome-diopside (15 grams/ton) and pyrope (7 grams/ton). Picroilmenite is practically absent.

[Note: "argillite" probably means shale, not the very low grade metamorphic rock. The Russian term "aleurolite" is close in meaning to "siltstone".]

Geologic unit: Lomonosovskaya Pipe, Zolotitskoye Field, Arkhangelskaya Diamond Province, Late Devonian

Locality: Lomonosovskaya Pipe, north-northeast of the town of Arkhangelsk, Arkhangelsk Region, east of the White Sea, northwestern Russia
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Source https://www.flickr.com/photos/47445767@N05/50621983188/
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@N05/50621983188. It was reviewed on 20 November 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

20 November 2020

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