File:Dunite (Dun Mountain Ophiolite Belt, Early Permian, 275-285 Ma; Dun Mountain, Bryant Range, northern South Island, central New Zealand) (15024813402).jpg
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| Description |
Dunite (4.9 cm across) from the Permian of the dunite type locality: Dun Mountain, New Zealand. 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 m.y. Locality: Dun Mountain, Bryant Range, ~15 km southeast of the city of Nelson, northwest of the Pelorus River, northern South Island, central New Zealand. 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. Shown below is a sample of Dun Mountain dunite. It’s been metamorphosed, but not serpentinized. This dunite tectonite has a grayish 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. |
| Date | |
| Source | Dunite (Dun Mountain Ophiolite Belt, Early Permian, 275-285 Ma; Dun Mountain, Bryant Range, northern South Island, central New Zealand) |
| 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@N05/15024813402 (archive). It was reviewed on 6 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 01:29, 6 December 2019 | | 1,219 × 657 (200 KB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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