File:Large layered anorthosite inclusion (Precambrian) in Beaver River Diabase (Beaver Bay Complex, Mesoproterozoic, 1096 Ma) (Split Rock Lighthouse, Minnesota, USA) 2.jpg
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Summary
DescriptionLarge layered anorthosite inclusion (Precambrian) in Beaver River Diabase (Beaver Bay Complex, Mesoproterozoic, 1096 Ma) (Split Rock Lighthouse, Minnesota, USA) 2.jpg |
English: Anorthosite in the Precambrian of Minnesota, USA.
This is Split Rock Lighthouse, built atop Stony Point along the northern shoreline of western Lake Superior. It was built in 1909 and 1910 in response to the wrecks of nine different lake vessels during a winter storm in late November 1905. The rock outcrop at the base of the lighthouse complex 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@N05/22631697138/ |
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@N05/22631697138. 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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8 June 2015
0.0015625 second
2.8
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Date/Time | Dimensions | User | Comment | |
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current | 22:57, 8 October 2020 | 4,000 × 2,506 (3.37 MB) | Ser Amantio di Nicolao | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/22631697138/ with UploadWizard |
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot D10 |
Exposure time | 1/640 sec (0.0015625) |
F Number | f/2.8 |
ISO speed rating | 80 |
Date and time of data generation | 15:34, 8 June 2015 |
Lens focal length | 6.2 mm |
Image title | |
Width | 4,000 px |
Height | 3,000 px |
Bits per component |
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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 | 19:59, 15 November 2015 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 15:34, 8 June 2015 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 9.3125 |
APEX aperture | 2.96875 |
APEX exposure bias | -0.33333333333333 |
Maximum land aperture | 2.96875 APEX (f/2.8) |
Metering mode | Pattern |
Flash | Flash did not fire, compulsory flash suppression |
Supported Flashpix version | 1 |
Color space | sRGB |
Focal plane X resolution | 16,460.905349794 |
Focal plane Y resolution | 16,483.516483516 |
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 | 12:59, 15 November 2015 |
Unique ID of original document | 5D0B60E7F70D112924BDC71F6A31FE7D |