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File:Kimberlite (Pionerskaya Pipe, Late Devonian; Arkhangelsk Region, Russia) 12.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.

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

Autholith kimberlite breccia, Pionerskaya Pipe, Zolotitskoye Field.

Structure is lithocrystalloclastic, ataxitic, banded. The rock contains: 5-7% of xenogenous material (quartz grains and argillite fragments), 10-15% of nuclear-bearing, nuclear-free and filmy autoliths. Enclosing kimberlite groundmass includes up to 80% olivine of the first and second generation replaced by serpentine with the admixtures of saponite and carbonate. Olivine-I is predominant. Kimberlite of fragments differs from enclosing kimberlite groundmass by higher content of ore dissemination. Diamond-satellite mineral specialization corresponds to all pipes of Zolotiskoe Field; predominant chrome-spinellid (hundreds of grams/ton of rock), in less degree pyrope and chrome-diopsides (ones to tens of grams/ton of rock).

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

Locality: Pionerskaya 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@N05/50598730582/
Author James St. John

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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/50598730582. It was reviewed on 18 November 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

18 November 2020

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current03:00, 18 November 2020Thumbnail for version as of 03:00, 18 November 20203,630 × 2,859 (5.98 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50598730582/ with UploadWizard

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