Dosiero:Amphibolite (Willyama Supergroup, Paleoproterozoic; Alexandra Mine, Broken Hill Block, New South Wales, Australia) 2 (26353541481).jpg
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Resumo
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Amphibolite from the Precambrian of Australia. (field of view ~7.5 centimeters across) 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 |
| Dato | |
| Fonto | Amphibolite (Willyama Supergroup, Paleoproterozoic; Alexandra Mine, Broken Hill Block, New South Wales, Australia) 2 |
| Aŭtoro | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/26353541481 (archive). It was reviewed on la 22-a de oktobro 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| Dato/Horo | Bildeto | Grandecoj | Uzanto | Komento | |
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| nun | 05:53, 22 okt. 2019 | | 4 000 × 3 000 (4,46 MB) | Rudolphous | Transferred from Flickr via #flickr2commons |
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