Dunite (Dun Mountain Ophiolite Belt, Early Permian, 275-285 Ma; Dun Mountain, Bryant Range, South Island, New Zealand) 2 : 無料・フリー素材/写真
Dunite (Dun Mountain Ophiolite Belt, Early Permian, 275-285 Ma; Dun Mountain, Bryant Range, South Island, New Zealand) 2 / James St. John
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
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| 説明 | 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 MaLocality: Dun Mountain, Bryant Range, ~15 kilometers southeast of the city of Nelson, northwest of the Pelorus River, northern South Island, central New Zealand |
| 撮影日 | 2021-01-20 23:23:46 |
| 撮影者 | James St. John |
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