File:Marble (Yule Marble, Middle Miocene, 12 Ma; Marble, northern Gunnison County, western Colorado, USA) 1 (16887652852).jpg
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Summary
[edit]DescriptionMarble (Yule Marble, Middle Miocene, 12 Ma; Marble, northern Gunnison County, western Colorado, USA) 1 (16887652852).jpg |
Marble from the Miocene of Colorado, USA. (CSM public display, grounds of the Colorado School of Mines Geology Museum, Golden, Colorado, USA) Metamorphic rocks result from intense alteration of any previously existing rocks by heat and/or pressure and/or chemical change. This can happen as a result of regional metamorphism (large-scale tectonic events, such as continental collision or subduction), burial metamorphism (super-deep burial), contact metamorphism (by the heat & chemicals from nearby magma or lava), hydrothermal metamorphism (by superheated groundwater), shear metamorphism (in or near a fault zone), or shock metamorphism (by an impact event). Other categories include thermal metamorphism, kinetic metamorphism, and nuclear metamorphism. Many metamorphic rocks have a foliated texture, but some are crystalline or glassy. Marble is a common, crystalline-textured metamorphic rock composed of calcite (CaCO3 - calcium carbonate). It forms by intermediate- to high-grade metamorphism of limestone. Marble varies in color and crystal size, but is reliably identified by its crystalline texture, by bubbling in acid, and by not scratching glass (marble has a hardness of 3, while glass has a hardness of 5.5). The specimen shown above is part of a large block of Yule Marble, the state rock of Colorado, from near the town of Marble, Colorado, USA. Yule Marble formed by contact metamorphism of the Leadville Limestone (Mississippian). The igneous intrusion that metamorphosed limestone into marble is the Treasure Mountain Granite (Middle Miocene, 12 Ma). Geologic unit & age: Yule Marble, Middle Miocene, 12 Ma Locality: quarry near the town of Marble, northern Gunnison County, western Colorado, USA |
Date | |
Source | Marble (Yule Marble, Middle Miocene, 12 Ma; Marble, northern Gunnison County, western Colorado, USA) 1 |
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@N05/16887652852 (archive). It was reviewed on 4 November 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
4 November 2019
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current | 14:41, 4 November 2019 | 1,839 × 1,985 (1.28 MB) | Ainz Ooal Gown (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Camera manufacturer | NIKON CORPORATION |
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Camera model | NIKON D70s |
Exposure time | 1/1,250 sec (0.0008) |
F-number | f/9 |
ISO speed rating | 500 |
Date and time of data generation | 12:42, 25 July 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 13.0 (Macintosh) |
File change date and time | 22:47, 21 March 2015 |
Y and C positioning | Co-sited |
Exposure Program | Not defined |
Exif version | 2.21 |
Date and time of digitizing | 12:42, 25 July 2007 |
Meaning of each component |
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Image compression mode | 4 |
APEX shutter speed | 10.287712 |
APEX aperture | 6.33985 |
APEX exposure bias | 0 |
Maximum land aperture | 5 APEX (f/5.66) |
Metering mode | Pattern |
Light source | Unknown |
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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 | None |
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 | 18:47, 21 March 2015 |
Unique ID of original document | 17D78AEA21FACD2FD9D91B18FABABCAE |