File:Amphibolite (Willyama Supergroup, Paleoproterozoic; Alexandra Mine, Broken Hill Block, New South Wales, Australia) 1 (26393781216).jpg
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[edit]DescriptionAmphibolite (Willyama Supergroup, Paleoproterozoic; Alexandra Mine, Broken Hill Block, New South Wales, Australia) 1 (26393781216).jpg |
Amphibolite from the Precambrian of Australia. (~16.9 centimeters across at its widest) 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. Amphibolite is a dark-colored, amphibole-dominated metamorphic rock. It is usually weakly foliated but can be crystalline-textured. Amphibolites are principally composed of hornblende amphibole and plagioclase feldspar. Many amphibolites form by metamorphism of basalt or gabbro (= mafic igneous rocks). The rock shown above is a Precambrian-aged, fine-grained amphibolite from the Broken Hill Block of New South Wales, Australia. It experienced at least two major high-grade metamorphic events. Stratigraphy: ~lower to ~middle Willyama Supergroup, late Paleoproterozoic; high-grade metamorphism at ~1660 Ma and at ~1599 to 1600 Ma Locality: Alexandra Mine (= locality "SN5" of Barnes, 1988 - New South Wales Geological Survey Bulletin 32: 210), 3 kilometers southeast of the town of Silverton & southeast of the confluence of Black Mill Creek and Umberumberka Creek, west-northwest of the city of Broken Hill, Broken Hill Block, far-western New South Wales, southeastern Australia |
Date | |
Source | Amphibolite (Willyama Supergroup, Paleoproterozoic; Alexandra Mine, Broken Hill Block, New South Wales, Australia) 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@N05/26393781216 (archive). It was reviewed on 22 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
22 October 2019
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current | 05:53, 22 October 2019 | ![]() | 3,797 × 2,135 (3.38 MB) | Rudolphous (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Camera manufacturer | Canon |
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Date and time of data generation | 00:41, 14 April 2016 |
Lens focal length | 7.23 mm |
Image title | |
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Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop Elements 13.0 (Macintosh) |
File change date and time | 00:46, 14 April 2016 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 00:41, 14 April 2016 |
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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 | 18:46, 13 April 2016 |
Unique ID of original document | 097B95E31685F05606585256F3A7A476 |