File:Large anorthosite xenolith in ophitic ilmenite gabbro (anorthosite series, Duluth Complex, Mesoproterozoic, 1099 Ma; Keene Creek East Skyline Parkway roadcut, Duluth, Minnesota, USA) 2 (22238237431).jpg
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DescriptionLarge anorthosite xenolith in ophitic ilmenite gabbro (anorthosite series, Duluth Complex, Mesoproterozoic, 1099 Ma; Keene Creek East Skyline Parkway roadcut, Duluth, Minnesota, USA) 2 (22238237431).jpg |
Large anorthosite xenolith in ophitic ilmenite gabbro in the Precambrian of Minnesota, USA. These rocks are part of the widespread Duluth Complex, a ~1.1 billion year old suite of igneous rocks in northeastern Minnesota that is associated with volcanism in the Lake Superior segment of the ancient Mid-Continent Rift System. The dark-colored rocks are gabbro. The light-colored mass is a single large anorthosite xenolith within the gabbro. Xenoliths are "foreign rocks" that sometimes occur in igneous rocks - they form by detachment of magma chamber wall rocks. In this case, the magma chamber contained gabbroic magma and the walls were anorthosite. Gabbro is a mafic, phaneritic (coarsely-crystalline), intrusive igneous rock dominated by the minerals plagioclase feldspar and pyroxene. Anorthosite is a mafic, phaneritic, intrusive igneous rock dominated by just plagioclase feldspar. Geologic unit & age of gabbros: anorthosite series, Duluth Complex, late Mesoproterozoic, 1099 Ma Age of anorthosite xenolith: unknown, but Precambrian, likely derived from the lower crust Locality: Keene Creek East outcrop - roadcut along the northern side of Skyline Parkway, Duluth, northeastern Minnesota, USA (46° 45’ 08.52” North, 92° 10’ 29.93” West) |
Date | |
Source | Large anorthosite xenolith in ophitic ilmenite gabbro (anorthosite series, Duluth Complex, Mesoproterozoic, 1099 Ma; Keene Creek East Skyline Parkway roadcut, Duluth, Minnesota, USA) 2 |
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@N05/22238237431 (archive). It was reviewed on 9 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
9 October 2019
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current | 06:17, 9 October 2019 | 4,000 × 3,000 (4.66 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot D10 |
Exposure time | 1/320 sec (0.003125) |
F-number | f/4 |
ISO speed rating | 80 |
Date and time of data generation | 08:40, 7 June 2015 |
Lens focal length | 11.614 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 | 16:20, 16 October 2015 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 08:40, 7 June 2015 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 8.3125 |
APEX aperture | 4 |
APEX exposure bias | −0.33333333333333 |
Maximum land aperture | 4 APEX (f/4) |
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 | 10:20, 16 October 2015 |
Unique ID of original document | 3DC442B4BD3F3C872ED1B566C87BDBC9 |