File:Dunite with clinopyroxenite and wehrlite (Little Port Complex, Bay of Islands Ophiolite, Middle Cambrian, 505 Ma; Springer's Hill chromite showing, Lewis Hills, Newfoundland).jpg
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English: Dunite with clinopyroxenite and wehrlite (wet, cut surface; field of view ~5.8 cm across) and brownish weathering rind, from Newfoundland’s Cambrian-aged Little Port Complex.
A classic place for seeing mantle rocks in an ophiolite is western Newfoundland. The rock is from the upper mantle portion of the late Middle Cambrian-aged (505 m.y.) Little Port Complex (Lewis Hills Massif, Bay of Islands Ophiolite). This a finely-crystalline dunite (olivine-rich peridotite) havine a “dun”-colored weathering rind. The dunite has a very coarsely-crystalline “vein” of clinopyroxenite (the nearly up-and-down, medium gray-green colored structure in the middle), a clinopyroxene-rich peridotite. The rock also has a patch of coarsely-crystalline wehrlite (upper & upper right portions of photo), which is a peridotite variety dominated by olivine + clinopyroxene, but having <10% orthopyroxene. These mantle rocks have been inferred to represent the lower lithosphere of an ancient island arc. Locality: Springers Hill Chromite showing, Lewis Hills, western Newfoundland. Ophiolites are fragments of oceanic lithosphere (basaltic crust + uppermost mantle) that have been metamorphosed and plastered onto the edges of continental lithospheric plates by obduction (the opposite of subduction). Some info. from: - Tony Peterson (pers. comm.) - Geological Association of Canada/Mineralogical Association of Canada 1988 Field Trip Guidebook B8, day 1, stop 1. - Suhr & Cawood (2001) - Geological Society of America Bulletin 113(8): 1025-1038. |
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| Source | https://www.flickr.com/photos/47445767@N05/14819285751/ |
| 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@N05/14819285751. It was reviewed on 12 November 2022 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 18:54, 12 November 2022 | | 1,230 × 801 (1.76 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/14819285751/ with UploadWizard |
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