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File:Kimberlite (Hamilton Branch Kimberlite, Elliott County Peridotite, Late Cretaceous, ~75 Ma; between Ison Creek & Hamilton Branch, Elliott County, Kentucky, USA).jpg

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English: Hamilton Branch Kimberlite from the Cretaceous of Kentucky, USA (field of view ~2.6 centimeters across).

This rock is from northeastern Kentucky’s nondiamondiferous Hamilton Branch Kimberlite (a.k.a. Hamilton Branch Pipe), part of the Late Cretaceous-aged Elliott County Peridotite. It has obvious & abundant serpentinized olivine crystals (= rounded to irregularly shaped green masses). Small xenoliths of eclogite from the upper mantle have been reported from this pipe, but are rare.

Locality: between Ison Creek and Hamilton Branch (Hamilton Creek), between Rt. 409 and Hamilton Creek Road, west of the town of Stephens & east of Newfoundland, eastern Elliott County, northeastern Kentucky, USA (vicinity of 38° 07’ 42” North latitude, 82° 58’ 53” West longitude)

Most info. from:

Schulze (1984), in Kimberlites II: the Mantle and Crust-Mantle Relationships.
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Source https://www.flickr.com/photos/47445767@N05/14637076989/
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@N05/14637076989. 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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