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The Contribution of Tephra Constituents During Biogenic Silica Determination: Implications for Soil and Paleoecological Studies : Volume 12, Issue 4 (25/02/2015)

By Clymans, W.

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Book Id: WPLBN0003973593
Format Type: PDF Article :
File Size: Pages 41
Reproduction Date: 2015

Title: The Contribution of Tephra Constituents During Biogenic Silica Determination: Implications for Soil and Paleoecological Studies : Volume 12, Issue 4 (25/02/2015)  
Author: Clymans, W.
Volume: Vol. 12, Issue 4
Language: English
Subject: Science, Biogeosciences, Discussions
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2015
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Der Putten, N. V., Barão, L., Björck, S., Clymans, W., Conley, D. J., Wastegård, S.,...Struyf, E. (2015). The Contribution of Tephra Constituents During Biogenic Silica Determination: Implications for Soil and Paleoecological Studies : Volume 12, Issue 4 (25/02/2015). Retrieved from http://kindle.worldlibrary.net/


Description
Description: Department of Geology, Lund University, Sölvegatan 12, 22362 Lund, Sweden. Biogenic silica (BSi) is used as a proxy by soil scientists to identify biological effects on the Si cycle and by paleoecologists to study environmental changes. Alkaline extractions are typically used to measure BSi in both terrestrial and aquatic environments. The dissolution properties of volcanic glass in tephra deposits and their nano-crystalline weathering products are hypothesized to overlap those of BSi, however, data to support this behavior are lacking. The understanding that the Si-bearing fractions that dissolve in alkaline media (SiAlk) do not necessarily correspond to BSi, question the applicability of BSi as a proxy. Here, analysis of 15 samples reported as tephra-containing allows us to reject the hypothesis that tephra constituents produce an identical dissolution signal to that of BSi during alkaline extraction. We found that dissolution of volcanic glass shards is incomplete during alkaline dissolution. Simultaneous measurement of Al and Si used here during alkaline dissolution provides an important parameter to enable us to separate glass shard dissolution from dissolution of BSi and other Si-bearing fractions. The contribution from volcanic glass shard (between 0.2–4 wt.% SiO2), the main constituent of distal tephra, during alkaline dissolution can be substantial depending on the total SiAlk. Hence, soils and lake sediments with low BSi concentrations are highly sensitive to the additional dissolution from tephra constituents and its weathering products. We advise evaluation of the potential for volcanic or other non-biogenic contributions for all types of studies using BSi as an environmental proxy.

Summary
The contribution of tephra constituents during biogenic silica determination: implications for soil and paleoecological studies

Excerpt
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