File:Charoitite (charoite-dominated potassic metasomatite) (Early Cretaceous, 115-120 Ma; mine in the headwaters of the Davan-Ditmara streams area, south of Olekminsk, Yakutia, Siberia, Russia) 3 (49144359656).jpg
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DescriptionCharoitite (charoite-dominated potassic metasomatite) (Early Cretaceous, 115-120 Ma; mine in the headwaters of the Davan-Ditmara streams area, south of Olekminsk, Yakutia, Siberia, Russia) 3 (49144359656).jpg |
Charoitite (charoite-dominated potassic metasomatite) from the Cretaceous of Siberia. (public display, Yakutsk Public Unified Museum of History & Northern Folk Culture, Yakutsk, Siberia, Russia) The rare, impressively attractive, purple-colored mineral charoite is only known from a relatively small area in Siberia. Several odd, large igneous intrusions have been emplaced in Siberia’s Baikal-Aldan Belt. One of these, the Murun Complex, consists of several plutons. Emplacement of the Little Murun Pluton (Malyy Murun Pluton) has resulted in significant contact metamorphism of surrounding rocks. In the southern and southeastern contact aureole of the Little Murun Pluton is a charoitite-carbonatite complex. The charoitites are charoite-dominated contact metamorphic rocks. Metasomatism refers to rocks that have been altered by significant input of elements from an outside source. Because that’s primarily what contact metamorphism is about, such rocks can be called metasomatites. Some of the metasomatites in this area are purple-colored (“Sirenevyy Kamen” - the “Purple Stone” deposit). The purple material is the very rare mineral charoite. Charoite is a “garbage can” mineral, and the chemical formula assigned to it by geologists varies from publication to publication. Here’s one of the formulas I’ve seen, randomly picked: (K,Na)3(Ca,Sr,Ba,Mn)5Si12O30(OH·F)·3H2O - hydrous potassium sodium calcium strontium barium manganese hydroxy-fluorosilicate. Age: Aptian Stage, Early Cretaceous, 115-120 Ma Locality: Charoitites are mined from several specific, relatively closely-spaced localities in the headwaters areas of the Davan and Ditmara streams, south of Olekminsk & the Lena River, way northeast of Lake Baikal, southwestern Yakutia (Sakha), Siberia, Russia (~vicinity of 58º 22’ North latitude, 119º 11’ East longitude) |
Date | |
Source | Charoitite (charoite-dominated potassic metasomatite) (Early Cretaceous, 115-120 Ma; mine in the headwaters of the Davan-Ditmara streams area, south of Olekminsk, Yakutia, Siberia, Russia) 3 |
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@N05/49144359656 (archive). It was reviewed on 30 November 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
30 November 2019
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current | 17:11, 30 November 2019 | 2,858 × 1,049 (3.8 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Camera manufacturer | NIKON CORPORATION |
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Date and time of data generation | 02:36, 2 August 2008 |
Lens focal length | 82 mm |
Width | 3,008 px |
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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 | 20:45, 29 November 2019 |
Y and C positioning | Co-sited |
Exposure Program | Not defined |
Exif version | 2.21 |
Date and time of digitizing | 02:36, 2 August 2008 |
Meaning of each component |
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Image compression mode | 4 |
APEX shutter speed | 5.906891 |
APEX aperture | 4.811985 |
APEX exposure bias | 0 |
Maximum land aperture | 4.7 APEX (f/5.1) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash fired, strobe return light detected, auto mode |
DateTime subseconds | 80 |
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DateTimeDigitized subseconds | 80 |
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 | 123 mm |
Scene capture type | Standard |
Scene control | Low gain up |
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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 | 15:45, 29 November 2019 |
Unique ID of original document | 7C09F4F045DDEA93F4989DE38C72FDD8 |