Opin vísindi

Using Mg Isotopes to Estimate Natural Calcite Compositions and Precipitation Rates During the 2010 Eyjafjallajökull Eruption

Using Mg Isotopes to Estimate Natural Calcite Compositions and Precipitation Rates During the 2010 Eyjafjallajökull Eruption


Title: Using Mg Isotopes to Estimate Natural Calcite Compositions and Precipitation Rates During the 2010 Eyjafjallajökull Eruption
Author: Pogge von Strandmann, Philip A. E.
Olsson, Jonas
Luu, Tu-Han
Gíslason, Sigurður R.
Burton, Kevin W.
Date: 2019-02-01
Language: English
Scope: 6
University/Institute: Háskóli Íslands
University of Iceland
School: Verkfræði- og náttúruvísindasvið (HÍ)
School of Engineering and Natural Sciences (UI)
Department: Institute of Earth Sciences (UI)
Jarðvísindastofnun (HÍ)
Series: Frontiers in Earth Science;7
ISSN: 2296-6463
DOI: 10.3389/feart.2019.00006
Subject: Basalt; Carbonate; Magnesium isotopes; Travertine; Weathering; Magnesín (málmar); Kalksteinn; Veðrun
URI: https://hdl.handle.net/20.500.11815/1842

Show full item record

Citation:

Pogge von Strandmann PAE, Olsson J, Luu T-H, Gislason SR and Burton KW (2019) Using Mg Isotopes to Estimate Natural Calcite Compositions and Precipitation Rates During the 2010 Eyjafjallajökull Eruption. Frontiers in Earth Science 7:6. doi: 10.3389/feart.2019.00006

Abstract:

Chemical weathering of silicate rocks is a key control on the long-term climate, via drawdown of atmospheric CO 2 . Magnesium isotopes are increasingly being used to trace weathering, but are often complicated by several coincident fractionating processes. Here we examine Mg isotope ratios of waters stemming from beneath lava flows from the 2010 Eyjafjallajökull eruption. Travertine calcite was observed directly precipitating from these high-TDS (total dissolved solids) waters, and were also sampled. This system therefore provides the opportunity to study natural Mg isotope fractionation by calcite. Riverine δ 26 Mg increase from −2.37 to +0.43% with flow distance, as isotopically light travertine precipitates (δ 26 Mg = −3.38 to −3.94%). The solution Mg isotope ratios also co-vary with pH, calcite saturation indices and Sr/Ca ratios, strongly indicating that they are dominantly controlled by carbonate precipitation. Using experimental isotopic fractionation factors and the measured δ 26 Mg values, we can predict the compositions of the precipitated travertines that are within uncertainty of the directly measured travertines. Hence, in some systems, Mg isotopes can be used to quantify carbonate precipitation.

Description:

Publisher's version (útgefin grein)

Rights:

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

Files in this item

This item appears in the following Collection(s)