File:Ultrapotassic metasomatite (Squaw Gulch roadcut, Cripple Creek Mining District, Colorado, USA) 1.jpg
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Summary
[edit]DescriptionUltrapotassic metasomatite (Squaw Gulch roadcut, Cripple Creek Mining District, Colorado, USA) 1.jpg |
English: Weathered ultrapotassic metasomatite in Colorado, USA.
This outcrop is at the western boundary of the Cripple Creek Diatreme, the root zone of an ancient, eroded volcanic center of Oligocene age. The diatreme is variably mineralized with a suite of gold-bearing minerals. The rock seen here is an ultrapotassic metasomatite with weathering stains. This site was visited during a 2007 Geological Society of America national conference field trip. There were many people and we were rushed - not much time to listen to the field trip leaders, take notes, take pictures, look at the rocks, and take samples. As a consequence, I didn't and still don't fully understand this particular material. "Metasomatite" refers to a rock that has been highly chemically altered. Metasomatism is a form of metamorphism. Most metamorphic rocks have been intensely altered by heat and/or pressure resulting from regional tectonic activity or deep burial. The original rock here may have been Precambrian granite (Cripple Creek Leucogranite, Mesoproterozoic, ~1.43 Ga) or Oligocene phonolite (Cripple Creek Diatreme, Early Oligocene, ~32 Ma). This cut is at the transition between diatreme and older country rocks - I'm not exactly sure which side of the boundary this is. Both the country rocks and diatreme rocks have been altered and covered with weathering stains. This locality no longer exists. Since 2007, the road has been diverted, the adjacent valley of Squaw Gulch has been filled in, and the area is now part of the mining operation. Locality: former Route 67 roadcut along the northern side of Squaw Gulch, Cripple Creek Mining District, southern Teller County, central Colorado, USA |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/49244972033/ |
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@N05/49244972033. It was reviewed on 15 January 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
15 January 2020
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current | 17:54, 15 January 2020 | 3,008 × 2,000 (5 MB) | Ser Amantio di Nicolao (talk | contribs) | User created page with UploadWizard |
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Metadata
This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
Camera manufacturer | NIKON CORPORATION |
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Camera model | NIKON D70s |
Exposure time | 1/1,600 sec (0.000625) |
F-number | f/10 |
ISO speed rating | 1,600 |
Date and time of data generation | 12:32, 27 October 2007 |
Lens focal length | 200 mm |
Width | 3,008 px |
Height | 2,000 px |
Bits per component |
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Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | Adobe Photoshop Elements 16.0 (Macintosh) |
File change date and time | 21:14, 19 December 2019 |
Y and C positioning | Co-sited |
Exposure Program | Not defined |
Exif version | 2.21 |
Date and time of digitizing | 12:32, 27 October 2007 |
Meaning of each component |
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Image compression mode | 4 |
APEX shutter speed | 10.643856 |
APEX aperture | 6.643856 |
APEX exposure bias | 0 |
Maximum land aperture | 5 APEX (f/5.66) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash did not fire |
DateTime subseconds | 00 |
DateTimeOriginal subseconds | 00 |
DateTimeDigitized subseconds | 00 |
Supported Flashpix version | 1 |
Color space | sRGB |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Scene type | A directly photographed image |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Focal length in 35 mm film | 300 mm |
Scene capture type | Standard |
Scene control | Low gain up |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Subject distance range | Unknown |
Serial number of camera | 1004a0cc |
Lens used | 18.0-200.0 mm f/3.5-5.6 |
Date metadata was last modified | 16:14, 19 December 2019 |
Unique ID of original document | D8D180AE8CD191FCB86C94C840FF0089 |