File:Atacamaites (Late Miocene, 7.83 Ma; Atacama Desert, Chile) 1.jpg
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Summary
editDescriptionAtacamaites (Late Miocene, 7.83 Ma; Atacama Desert, Chile) 1.jpg |
English: Atacamaites are black-colored impact splash glasses recovered from the Atacama Desert in Chile, South America. They've been interpreted as being deposited relatively close to the impact site, which is currently undiscovered. Many impact splash glasses are given the generic name "tektite", but that term appears to be restricted to objects deposited far from an impact site. Both proximal and distal impact glasses form when a meteoroid or asteroid impacts Earth. The impact event pulverizes, ejects, heats, and melts target rocks. As the material falls back to Earth, rapid cooling of the melt results in glass.
Atacamaite morphology ranges from bulbous to elongated to raindrop-shaped to dumbbell-shaped to irregular. Compositionally, they are close to dacite, a type of volcanic rock. Atacamaite chemistry shows that they also consist of some meteoritic material. The impacting object was probably a group IIAB iron (the other types of meteorites are stony and stony-iron). Fission-track dating indicates the impact occurred during the Late Miocene, about 7.83 million years ago. Locality: Atacamaite Strewn Field, east of the town of Paposo & south-southeast of the town of Antofagasta, Atacama Desert, northern Chile Much info. synthesized from: Gattacceca et al. (2021) - A 650 km2 Miocene strewnfield of splash-form impact glasses in the Atacama Desert, Chile. Earth and Planetary Letters 569(117049). 10 pp. |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/51783728521/ |
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@N05/51783728521. It was reviewed on 29 December 2021 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
29 December 2021
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current | 16:48, 29 December 2021 | 3,027 × 2,265 (3.58 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/51783728521/ 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 | 13:27, 15 December 2021 |
Lens focal length | 11.614 mm |
Width | 4,000 px |
Height | 3,000 px |
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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 | 01:20, 17 December 2021 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 13:27, 15 December 2021 |
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Image compression mode | 3 |
APEX shutter speed | 5.90625 |
APEX aperture | 6.90625 |
APEX exposure bias | −0.33333333333333 |
Maximum land aperture | 4 APEX (f/4) |
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 |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 20:20, 16 December 2021 |
Unique ID of original document | 675C59278252893D8D7595685214B319 |