Abrasion in pyroclastic flows

Freundt, Armin and Schmincke, Hans-Ulrich (1992) Abrasion in pyroclastic flows Geologische Rundschau, 81 . pp. 383-389. DOI 10.1007/BF01828605.

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Abstract

The relative size of glass rims coating crystals in the matrix ash provides a semi-quantitative measure of abrasion of ash grains in pyroclastic flows. Median abrasion indices (= areacrystal / areaglass rim) are 8.4 to 18.5 in Laacher See pyroclastic flow units but only 4 to 6.3 in assocciated fallout, showing stronger abrasion of ash particles in the pyroclastic flows. All pyroclasts undergo strong attrition in the vent but clasts in pyroclastic flows undergo a second major phase of abrasion during high-energy near-vent flow. Abrasion of ash particles is weaker during lower-energy higher-strength motion further downstream, suggesting that high contents of fine ash in distal deposits are due to diminishing elutriation rather than high rate of attrition.

Document Type: Article
Keywords: Volcanology; Pyroclastic flows
Research affiliation: OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-MUHS Magmatic and Hydrothermal Systems
Refereed: Yes
DOI etc.: 10.1007/BF01828605
ISSN: 0016-7835
Date Deposited: 14 Feb 2011 09:42
Last Modified: 02 Mar 2018 11:41
URI: http://eprints.uni-kiel.de/id/eprint/11458

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