File:Chalcopyrite-pyrrhotite (Late Cretaceous; Cable Mine, ~1.4 miles east of Georgetown, Deer Lodge County, western Montana, USA) 2.jpg
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[edit]DescriptionChalcopyrite-pyrrhotite (Late Cretaceous; Cable Mine, ~1.4 miles east of Georgetown, Deer Lodge County, western Montana, USA) 2.jpg |
English: Chalcopyrite-pyrrhotite mass from the Cretaceous of Montana, USA (5.6 cm across at its widest).
This is a sulfide mass from a replacement deposit (gold-copper contact metamorphic deposit) at Montana's Cable Mine. The rock principally consists of chalcopyrite (CuFeS2 - copper iron sulfide) and pyrrhotite (Fe1-xS - imperfect iron monosulfide). The latter mineral is basically magnetic fool's gold. Secondary minerals coat this specimen in places. The Cable Mine is a gold mine started in the 1860s. It targeted macroscopic and microscopic native gold mixed with quartz, calcite, sulfides, and other minerals. The ore body at this mine is in a large, ~tabular mass of calcitic marble, which is metamorphosed dolomitic limestone of the Upper Cambrian Hasmark Formation. The limestone was contact metamorphosed into ore-bearing marble by the intrusion of the Cable Batholith, a Late Cretaceous granodiorite unit. The marble mass is almost completely surrounded by granodiorite, and is likely a roof pendant of that intrusion. Ore mineralization apparently accompanied the formation of marble from dolomitic limestone. Ore formation involved metasomatism - the introduction of elements from hydrothermal fluids emanating from the granodiorite magma. Locality: Cable Mine (a.k.a. Atlantic Cable Mine), near the head of Cable Creek, southern slopes of Cable Mountain, ~1.4 miles east of Georgetown, Georgetown Mining District (Southern Cross Mining District; Cable Mining District), northwestern Deer Lodge County, western Montana, USA |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/15747657728/ |
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@N05/15747657728 (archive). It was reviewed on 22 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
22 December 2019
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current | 18:18, 22 December 2019 | 2,236 × 2,256 (1.83 MB) | Ser Amantio di Nicolao (talk | contribs) | User created page with UploadWizard |
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot D10 |
Exposure time | 1/60 sec (0.016666666666667) |
F-number | f/8 |
ISO speed rating | 80 |
Date and time of data generation | 21:02, 2 December 2014 |
Lens focal length | 6.2 mm |
Orientation | Normal |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop CS2 Macintosh |
File change date and time | 22:19, 2 December 2014 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 21:02, 2 December 2014 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 5.90625 |
APEX aperture | 6 |
APEX exposure bias | −0.66666666666667 |
Maximum land aperture | 2.96875 APEX (f/2.8) |
Metering mode | Pattern |
Flash | Flash fired, compulsory flash firing, red-eye reduction mode |
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 | Portrait |
Supported Flashpix version | 1 |
Image width | 2,236 px |
Image height | 2,256 px |
Date metadata was last modified | 17:19, 2 December 2014 |
IIM version | 2 |