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File:Gouverneur Marble (Mesoproterozoic, ~1.1 Ga; Route 11 roadcut north of Antwerp, New York State, USA) 25.jpg

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English: Marble in the Precambrian of New York State, USA.

Marble is a crystalline-textured metamorphic rock composed of calcite (CaCO3 - calcium carbonate). It bubbles in acid and does not scratch glass. Marble forms by the metamorphism of limestone, a common biogenic sedimentary rock.

The outcrop seen here is composed of whitish marble (mosty banded) that is graphitic and phlogopitic (= tiny black & brown specks in the rock). Some incorporated calc-silicate rock clasts having reaction rims are present. A portion of the outcrop consists of dolomitized marble (not dolomitic marble), where the host marble was locally dolomitized by injection of hot, magnesium-bearing fluids along a fracture. This resulted in the formation of a dike-like zone of light brown dolomitized marble, but it's not a dike.

The rocks here are part of the Gouverneur Marble of New York State's Adirondack Lowlands. The original limestones were metamorphosed at about 1.1 billion years ago, during the Grenville Orogeny.

Stratigraphy: Gouverneur Marble, Oswegatchie Group, Mesoproterozoic, ~1.1 Ga metamorphic age

Locality: Antwerp North Outcrop - roadcut on the southeastern side of Route 11, north of the town of Antwerp, Adirondack Lowlands, northern New York State, USA (44° 14’ 05.50” North latitude, 75° 36’ 01.83” West longitude)
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Source https://www.flickr.com/photos/47445767@N05/49897625777/
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@N05/49897625777. It was reviewed on 18 October 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

18 October 2020

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current02:11, 18 October 2020Thumbnail for version as of 02:11, 18 October 20204,000 × 3,000 (7 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/49897625777/ with UploadWizard

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