File:Dunite (Dun Mountain Ophiolite Belt, Early Permian, 275-285 Ma; Dun Mountain, Bryant Range, South Island, New Zealand) 2.jpg
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| Description |
English: Dunite from the Permian of New Zealand. (4.9 centimeters across)
Dunite is a 90%+ olivine-bearing peridotite, which is an ultramafic, intrusive igneous rock. How did dunite get its name? The type locality for dunite is Dun Mountain in New Zealand. Seen here is a sample of Dun Mountain dunite. It’s been metamorphosed, but not serpentinized. This dunite has a core of olivine plus some small black masses of chromite. The yellow-orangish weathering rind is referred to as “dun”-colored in New Zealand. The whole of Dun Mountain has surface-weathered dunite rocks of this color. Broken pieces show that the unweathered olivine is grayish green to dark olive green. Geologic unit & age: Dun Mountain Ophiolite Belt (= suture zone between a terrane and the ancient New Zealand margin of the Gondwana supercontinent), Early Permian, 275-285 Ma Locality: Dun Mountain, Bryant Range, ~15 kilometers southeast of the city of Nelson, northwest of the Pelorus River, northern South Island, central New Zealand |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/50860145947/ |
| 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@N05/50860145947. It was reviewed on 22 January 2021 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 23:09, 22 January 2021 | | 2,729 × 1,778 (3.8 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50860145947/ with UploadWizard |
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