File:Large layered anorthosite inclusion (Precambrian) in Beaver River Diabase (Beaver Bay Complex, Mesoproterozoic, 1096 Ma) (Split Rock Lighthouse, Minnesota, USA) 4.jpg
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[edit]DescriptionLarge layered anorthosite inclusion (Precambrian) in Beaver River Diabase (Beaver Bay Complex, Mesoproterozoic, 1096 Ma) (Split Rock Lighthouse, Minnesota, USA) 4.jpg |
English: Anorthosite in the Precambrian of Minnesota, USA.
The rock outcrop shown above occurs at the base of the Split House Lighthouse. This is part of a large layered anorthosite inclusion that is hosted in a diabase intrusion (not visible here) of the Beaver River Diabase. Anorthosite is a coarsely-crystalline, intrusive igneous rock composed principally, or ~exclusively, of plagioclase feldspar (= calcium sodium aluminosilicate, NaAlSi3O8 to CaAl2Si2O8). The layering is caused by slight compositional and/or crystal size differences, originally produced by differential crystal settling in an ancient magma chamber. Note: the anorthosite layering is the tilted banding from upper right to lower left. Description of this rock unit from Miller et al. (2001): "Anorthosite inclusion - Gray to pale-green, coarse- to medium-grained anorthosite to gabbroic anorthosite (more than 90 percent plagioclase); forms large (less than 500 m) blocks in unchilled ophitic olivine diabase." Geologic unit & age: large anorthosite inclusion (Precambrian) hosted in Beaver River Diabase (Beaver Bay Complex, Midcontinent Rift Intrusive Supersuite, late Mesoproterozoic, 1096 Ma) Locality: rocky base of Split Rock Lighthouse, Stony Point, northern shore of western Lake Superior, northeastern Minnesota, USA (47° 12’ 00.36” North latitude, 91° 22’ 01.45” West longitude) Reference cited: Miller et al. (2001) - Geologic map of the Duluth Complex and related rocks, northeastern Minnesota. Minnesota Geological Survey Miscellaneous Map Series Map M-119. |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/22427266634/ |
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@N05/22427266634. It was reviewed on 9 October 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
9 October 2020
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current | 05:57, 9 October 2020 | 3,995 × 2,853 (5.43 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/22427266634/ with UploadWizard |
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot D10 |
Exposure time | 1/500 sec (0.002) |
F-number | f/2.8 |
ISO speed rating | 80 |
Date and time of data generation | 15:27, 8 June 2015 |
Lens focal length | 6.2 mm |
Image title | |
Width | 4,000 px |
Height | 3,000 px |
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Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop Elements 13.0 (Macintosh) |
File change date and time | 19:58, 15 November 2015 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 15:27, 8 June 2015 |
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Image compression mode | 3 |
APEX shutter speed | 8.96875 |
APEX aperture | 2.96875 |
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Maximum land aperture | 2.96875 APEX (f/2.8) |
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Flash | Flash did not fire, compulsory flash suppression |
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Color space | sRGB |
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Focal plane resolution unit | inches |
Sensing method | One-chip color area sensor |
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 | Landscape |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 12:58, 15 November 2015 |
Unique ID of original document | 74EEF033B7408423A88CBACA8BF19D20 |