Power law olivine crystal size distributions in lithospheric mantle xenoliths
Olivine crystal size distributions (CSDs) have been measured in three suites of spinel- and garnet-bearing harzburgites and lherzolites found as xenoliths in alkaline basalts from Canary Islands, Africa; Victoria Land, Antarctica; and Pali Aike, South America. The xenoliths derive from lithospheric...
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ftunivpisairis:oai:arpi.unipi.it:11568/71718 2024-04-14T08:04:04+00:00 Power law olivine crystal size distributions in lithospheric mantle xenoliths ARMIENTI, PIETRO Tarquini S. Armienti, Pietro Tarquini, S. 2002 http://hdl.handle.net/11568/71718 https://doi.org/10.1016/S0024-4937(02)00195-0 unknown info:eu-repo/semantics/altIdentifier/wos/000179299400003 volume:65 issue:3-4 firstpage:273 lastpage:285 numberofpages:13 journal:LITHOS http://hdl.handle.net/11568/71718 doi:10.1016/S0024-4937(02)00195-0 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-0036890696 Power law Olivine size distribution Mantle xenolith Fractals info:eu-repo/semantics/article 2002 ftunivpisairis https://doi.org/10.1016/S0024-4937(02)00195-0 2024-03-21T18:26:10Z Olivine crystal size distributions (CSDs) have been measured in three suites of spinel- and garnet-bearing harzburgites and lherzolites found as xenoliths in alkaline basalts from Canary Islands, Africa; Victoria Land, Antarctica; and Pali Aike, South America. The xenoliths derive from lithospheric mantle, from depths ranging from 80 to 20 km. Their textures vary from coarse to porphyroclastic and mosaic-porphyroclastic up to cataclastic. Data have been collected by processing digital images acquired optically from standard petrographic thin sections. The acquisition method is based on a high-resolution colour scanner that allows image capturing of a whole thin section. Image processing was performed using the VISILOG 5.2 package, resolving crystals larger than about 150 gm and applying stereological corrections based on the Schwartz-Saltykov algorithm. Taking account of truncation effects due to resolution limits and thin section size, all samples show scale invariance of crystal size distributions over almost three orders of magnitude (0.2-25 mm). Power law relations show fractal dimensions varying between 2.4 and 3.8, a range of values observed for distributions of fragment sizes in a variety of other geological contexts. A fragmentation model can reproduce the fractal dimensions around 2.6, which correspond to well-equilibrated granoblastic textures. Fractal dimensions >3 are typical of porphyroclastic and cataclastic samples. Slight bends in some linear arrays suggest selective tectonic crushing of crystals with size larger than I mm. The scale invariance shown by lithospheric mantle xenoliths in a variety of tectonic settings forms distant geographic regions, which indicate that this is a common characteristic of the upper mantle and should be taken into account in theological models and evaluation of metasomatic models. (C) 2002 Elsevier Science B.V. All rights reserved. Article in Journal/Newspaper Antarc* Antarctica Victoria Land ARPI - Archivio della Ricerca dell'Università di Pisa Victoria Land Lithos 65 3-4 273 285 |
institution |
Open Polar |
collection |
ARPI - Archivio della Ricerca dell'Università di Pisa |
op_collection_id |
ftunivpisairis |
language |
unknown |
topic |
Power law Olivine size distribution Mantle xenolith Fractals |
spellingShingle |
Power law Olivine size distribution Mantle xenolith Fractals ARMIENTI, PIETRO Tarquini S. Power law olivine crystal size distributions in lithospheric mantle xenoliths |
topic_facet |
Power law Olivine size distribution Mantle xenolith Fractals |
description |
Olivine crystal size distributions (CSDs) have been measured in three suites of spinel- and garnet-bearing harzburgites and lherzolites found as xenoliths in alkaline basalts from Canary Islands, Africa; Victoria Land, Antarctica; and Pali Aike, South America. The xenoliths derive from lithospheric mantle, from depths ranging from 80 to 20 km. Their textures vary from coarse to porphyroclastic and mosaic-porphyroclastic up to cataclastic. Data have been collected by processing digital images acquired optically from standard petrographic thin sections. The acquisition method is based on a high-resolution colour scanner that allows image capturing of a whole thin section. Image processing was performed using the VISILOG 5.2 package, resolving crystals larger than about 150 gm and applying stereological corrections based on the Schwartz-Saltykov algorithm. Taking account of truncation effects due to resolution limits and thin section size, all samples show scale invariance of crystal size distributions over almost three orders of magnitude (0.2-25 mm). Power law relations show fractal dimensions varying between 2.4 and 3.8, a range of values observed for distributions of fragment sizes in a variety of other geological contexts. A fragmentation model can reproduce the fractal dimensions around 2.6, which correspond to well-equilibrated granoblastic textures. Fractal dimensions >3 are typical of porphyroclastic and cataclastic samples. Slight bends in some linear arrays suggest selective tectonic crushing of crystals with size larger than I mm. The scale invariance shown by lithospheric mantle xenoliths in a variety of tectonic settings forms distant geographic regions, which indicate that this is a common characteristic of the upper mantle and should be taken into account in theological models and evaluation of metasomatic models. (C) 2002 Elsevier Science B.V. All rights reserved. |
author2 |
Armienti, Pietro Tarquini, S. |
format |
Article in Journal/Newspaper |
author |
ARMIENTI, PIETRO Tarquini S. |
author_facet |
ARMIENTI, PIETRO Tarquini S. |
author_sort |
ARMIENTI, PIETRO |
title |
Power law olivine crystal size distributions in lithospheric mantle xenoliths |
title_short |
Power law olivine crystal size distributions in lithospheric mantle xenoliths |
title_full |
Power law olivine crystal size distributions in lithospheric mantle xenoliths |
title_fullStr |
Power law olivine crystal size distributions in lithospheric mantle xenoliths |
title_full_unstemmed |
Power law olivine crystal size distributions in lithospheric mantle xenoliths |
title_sort |
power law olivine crystal size distributions in lithospheric mantle xenoliths |
publishDate |
2002 |
url |
http://hdl.handle.net/11568/71718 https://doi.org/10.1016/S0024-4937(02)00195-0 |
geographic |
Victoria Land |
geographic_facet |
Victoria Land |
genre |
Antarc* Antarctica Victoria Land |
genre_facet |
Antarc* Antarctica Victoria Land |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/000179299400003 volume:65 issue:3-4 firstpage:273 lastpage:285 numberofpages:13 journal:LITHOS http://hdl.handle.net/11568/71718 doi:10.1016/S0024-4937(02)00195-0 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-0036890696 |
op_doi |
https://doi.org/10.1016/S0024-4937(02)00195-0 |
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Lithos |
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65 |
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3-4 |
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273 |
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285 |
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