File:Indochinite tektite (Pleistocene, 783-803 ka; Australasian Tektite Strewn Field, southeastern Asia) 30.jpg
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Summary
[edit]DescriptionIndochinite tektite (Pleistocene, 783-803 ka; Australasian Tektite Strewn Field, southeastern Asia) 30.jpg |
English: Indochinite tektite from the Pleistocene of southeastern Asia.
Large and small impacts have affected Earth since its formation 4.55 billion years ago. Compared with the intensely pitted and cratered Moon, Earth has relatively few preserved impact craters, because they have been destroyed by water erosion, glacial erosion, and plate tectonics. Impact events are accompanied by significant heating, which results in melting of much of the ejected pulverized target rocks. The melted material cools quickly while falling back to Earth and forms tektites - impact splash glasses. Tektites are principally composed of amorphous silica (SiO2). Broken surfaces show a conchoidal fracture. Tektites from different impact events are given different names. Indochinites are black-colored tektites from southeastern Asia that typically are subspherical to teardrop-shaped to dumbbell-shaped. They are found throughout the Australasian Tektite Strewn Field (a.k.a. Indochinite Tektite Strewn Field). This strewn field is huge - it's estimated to cover 10 to 20% of Earth's surface. Indochinites are found from Madagascar to Antarctica to Tasmania to South China. Samples from different geographic areas are often given different names (e.g., australites, thailandites, malaysianites, philippinites, billitonites, vietnamites), but they were all apparently formed by the same event. The site of the impact crater has long been a mystery, but is now identified as likely buried by basaltic lava flows in Laos, southeastern Asia (Sieh et al., 2019). The age of indochinites is about 783 to 803 ka. Locality: unrecorded/undisclosed site in southeastern Asia Reference cited: Sieh et al. (2019) - Australasian impact crater buried under the Bolaven Volcanic Field, southern Laos. Proceedings of the National Academy of Sciences 117: 1346-1353. |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/52037149923/ |
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@N05/52037149923. It was reviewed on 29 April 2022 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
29 April 2022
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current | 15:45, 29 April 2022 | 1,386 × 1,122 (914 KB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/52037149923/ 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/11 |
ISO speed rating | 80 |
Date and time of data generation | 10:26, 20 April 2022 |
Lens focal length | 11.614 mm |
Width | 4,000 px |
Height | 3,000 px |
Bits per component |
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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 18.0 (Macintosh) |
File change date and time | 23:21, 28 April 2022 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 10:26, 20 April 2022 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 5.90625 |
APEX aperture | 6.90625 |
APEX exposure bias | −0.66666666666667 |
Maximum land aperture | 4 APEX (f/4) |
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Flash | Flash fired, compulsory flash firing, red-eye reduction mode |
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Color space | sRGB |
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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 |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 19:21, 28 April 2022 |
Unique ID of original document | 754889C759A421CCB8F00C5B2DB69529 |
IIM version | 32,767 |