File:Chromitic serpentinite (Little Port Complex, Bay of Islands Ophiolite, Middle Cambrian, 505 Ma; Springer's Hill outcrop, Lewis Hills, Newfoundland) 4.jpg
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[edit]DescriptionChromitic serpentinite (Little Port Complex, Bay of Islands Ophiolite, Middle Cambrian, 505 Ma; Springer's Hill outcrop, Lewis Hills, Newfoundland) 4.jpg |
English: Chromitic serpentinite from the Cambrian of Newfoundland, Canada.
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). A classic place for seeing mantle rocks in an ophiolite is western Newfoundland. This rock is from the upper mantle portion of the Cambrian-aged Little Port Complex. It was originally a chromitic dunite, but it’s been metamorphosed - the olivine has been altered to serpentine (= yellowish-green portions of the rock). The black areas are chromite (FeCr2O4 - iron chromium oxide). The mantle rocks in this area have been inferred to represent the lower lithosphere of an ancient island arc. Geologic unit: Little Port Complex, Lewis Hills Massif, Bay of Islands Ophiolite, late Middle Cambrian, 505 Ma Locality: Springer’s Hill outcrop, Lewis Hills, western Newfoundland, eastern Canada (~vicinity of 48º 47’ 32” North latitude, 58º 26’ 38” West longitude) 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. |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/50717822783/ |
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@N05/50717822783. It was reviewed on 14 December 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
14 December 2020
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current | 19:36, 14 December 2020 | 2,505 × 1,415 (2.78 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50717822783/ with UploadWizard |
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Camera manufacturer | Canon |
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Exposure time | 1/60 sec (0.016666666666667) |
F-number | f/10 |
ISO speed rating | 80 |
Date and time of data generation | 19:31, 10 December 2020 |
Lens focal length | 9.681 mm |
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Height | 3,000 px |
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Orientation | Normal |
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Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop Elements 18.0 (Macintosh) |
File change date and time | 05:13, 14 December 2020 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 19:31, 10 December 2020 |
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APEX aperture | 6.65625 |
APEX exposure bias | −1 |
Maximum land aperture | 3.625 APEX (f/3.51) |
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File source | Digital still camera |
Custom image processing | Normal process |
Exposure mode | Manual exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Scene capture type | Standard |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 00:13, 14 December 2020 |
Unique ID of original document | C9AF2387A4A381AD13BC1A13722886BA |