Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun geology A very large
breccia
Etymologies
Sorry, no etymologies found.
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Examples
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In many of these locations, CRISM has identified clays in the material cementing the clasts together, providing yet another motivation for the study of megabreccia.
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In this 200 meter (about 1/8 of a mile) diameter exposure of megabreccia, clasts of various colors (indicating different kinds of rocks) and sizes have been exposed in the uplifted central peak of Toro Crater.
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The subimage shows a close-up of one of the features that make Toro Crater a great target for HiRISE images: colorful patches of megabreccia.
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So far, HiRISE has found megabreccia in more than a hundred places on Mars.
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Scientists think that megabreccia may have formed early in Mars 'history during a period of frequent impact crater formation.
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HiRISE frequently targets the central peaks of craters, because these features tend to bring up rocks like these megabreccia that are usually buried under the surface.
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The oldest things are areas where we see a particular type of rock called megabreccia.
unknown title 2009
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While it is possible that the megabreccia formed from a catastrophic release of water into the crater, a more likely possibility is that it formed from the impact that created the approximately 150 kilometer-in-diameter Holden Crater.
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Popigai Crater, a terrestrial crater of half the size of Holden, possesses a similar occurrence of megabreccia with a comparable range in megaclast size to the Holden Crater example.
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'Breccia' is broken-up, angular fragments of rock, 'megabreccia' means they're big angular fragments, and these are from energetic events, such as impact events.
unknown title 2009
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