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Effects of the peat acid digestion protocol on geochemically and morphologically diverse tephra deposits
Stockholm University, Faculty of Science, Department of Physical Geography.
Number of Authors: 42019 (English)In: Journal of Quaternary Science, ISSN 0267-8179, E-ISSN 1099-1417, Vol. 34, no 4-5, p. 269-274Article in journal (Refereed) Published
Abstract [en]

Tephra shards for electron probe microanalysis are most efficiently extracted from peat using acid digestion, which removes organic material that hinders density separation methods. However, strong acids are known to alter glass chemical compositions, and several studies have examined how acid digestion affects rhyolitic volcanic glass. The focus on rhyolitic tephra in these studies leaves considerable uncertainty, as the dissolution rates of natural glasses (including tephra) are determined by the chemical composition and surface area/volume ratio, both of which vary in tephra deposits. Here, we use duplicate samples of basaltic, trachydacitic and rhyolitic tephra to examine physical and geochemical alteration following acid digestion. Scanning electron microscope imagery reveals no discernible degradation of glass surfaces, and electron probe microanalysis results from duplicate samples are statistically indistinguishable. These findings suggest the acid digestion protocol for organic peats does not significantly alter glass geochemistry regardless of shard morphologies or geochemical compositions.

Place, publisher, year, edition, pages
2019. Vol. 34, no 4-5, p. 269-274
Keywords [en]
acid digestion, chemical durability, electron probe microanalysis, peatlands, tephra
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-171742DOI: 10.1002/jqs.3104ISI: 000475015500001OAI: oai:DiVA.org:su-171742DiVA, id: diva2:1349469
Available from: 2019-09-09 Created: 2019-09-09 Last updated: 2019-09-09Bibliographically approved

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