File:Ferruginous sandstone (Arkhangelskaya Pipe, Late Devonian; Arkhangelsk Region, Russia) 1.jpg

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English: Sandstone from the Devonian of Russia. (~5.6 centimeters across at its widest)

This sample is from an exploratory drill core in a diamondiferous kimberlite pipe in northwestern Russia. The rock is a sandstone, deposited in the crater facies of the diatreme - such crater deposits are usually eroded away. The rusty color is from iron oxide. It is a silty sandstone with some granules and a couple pebble-sized grains (seen on the other sides). Sediment compositions are quartz and lithic grains. The latter include altered kimberlite fragments.

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

Tuff sandstone, Arkhangelskaya Pipe, Zolotitskoye Field.

Aleuro-psammitic structure. Clastic product is mainly represented by crystalloclasts of quartz and lithoclasts of aleurolite and argillite. General content of clastogenic product in rock is 80-85 of volumetric percent. Fragments have rounded and sharply angular form and size from 0.03 to 0.2 to 3-4 millimeters. Cemented mass - hydrous ferric oxides with the admixture of carbonaceous and hydromica product. Kimberlite prodcut (up to 20%) is presented in the form of changed small fragments of olivine and kimberlite lithoclasts and autholiths. Tuff sandstones represent crateral facies.

[Note: "aleuro-" and "aleurolite" are Russian geologic terms for silt, silty, and siltstone. "Psammitic" refers to sand, sandy, and sandstone. "Argillite" probably means shale, not the very low-grade metamorphic rock.]

Geologic unit: Arkhangelskaya Pipe, Zolotitskoye Field, Late Devonian

Locality: Lomonosov Diamond Mine, north-northeast of the town of Arkhangelsk, Arkhangelsk Region, east of the White Sea, northwestern Russia (65° 17' 26.41" North latitude, 41° 01' 04.64" East longitude)
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Source https://www.flickr.com/photos/47445767@N05/50448812857/
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@N05/50448812857. It was reviewed on 2 November 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

2 November 2020

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current17:03, 2 November 2020Thumbnail for version as of 17:03, 2 November 20202,134 × 1,974 (2.89 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50448812857/ with UploadWizard

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