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File:Kimberlite (Olginskaya Pipe, Arkhangelsk Region, Russia) 1.jpg

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Description
English: This sample is from an exploratory drill core in a kimberlite pipe in northwestern Russia.

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

Kimberlite xenotufobreccia (kimberlite xenotuff breccia), Olginskaya Pipe, Kepinskoye Field

The content of kimberlite material varies from the first percents up to 30-35%. It is represented by olivine of the first generation, autholiths (up to 15-20%) and fragments of kimberlites or irregular form. Lithoclasts reach 3 centimeters in size, among them there are microlite-bearing and microlite-free melilite kimberlites. Xenogenous material (up to 40%) is represented by quartz and fragments of argillites. Cement consists of aggregate of carbonate, saponite, and limonite. The content of diamond-satellite minerals is very low (as in all pipes of Kepinskaya Field). Chrome spinellid, pyrope, chrome-diopside, and picroilmenite were noted.

I've not yet seen a published age for this kimberlite pipe.

Geologic unit: Olginskaya Pipe, Kepinskoye Field (Kepinskoe Field; Kepinskaya Field), Arkhangelskaya Diamond Province

Locality: Olginskaya 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@N05/50701923922/
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@N05/50701923922. It was reviewed on 11 December 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

11 December 2020

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current16:21, 11 December 2020Thumbnail for version as of 16:21, 11 December 20202,999 × 2,049 (4.17 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50701923922/ with UploadWizard

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