Using Mg Isotopes to Estimate Natural Calcite Compositions and Precipitation Rates During the 2010 Eyjafjallajökull Eruption
Chemical weathering of silicate rocks is a key control on the long-term climate, via drawdown of atmospheric CO2. 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 s...
Published in: | Frontiers in Earth Science |
---|---|
Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Frontiers Media S.A.
2019
|
Subjects: | |
Online Access: | https://doi.org/10.3389/feart.2019.00006 https://doaj.org/article/a4bf65fa6f7c4fd2aac2ee6dbf42c460 |
id |
ftdoajarticles:oai:doaj.org/article:a4bf65fa6f7c4fd2aac2ee6dbf42c460 |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:a4bf65fa6f7c4fd2aac2ee6dbf42c460 2023-05-15T16:09:27+02:00 Using Mg Isotopes to Estimate Natural Calcite Compositions and Precipitation Rates During the 2010 Eyjafjallajökull Eruption Philip A. E. Pogge von Strandmann Jonas Olsson Tu-Han Luu Sigurður R. Gislason Kevin W. Burton 2019-02-01T00:00:00Z https://doi.org/10.3389/feart.2019.00006 https://doaj.org/article/a4bf65fa6f7c4fd2aac2ee6dbf42c460 EN eng Frontiers Media S.A. https://www.frontiersin.org/article/10.3389/feart.2019.00006/full https://doaj.org/toc/2296-6463 2296-6463 doi:10.3389/feart.2019.00006 https://doaj.org/article/a4bf65fa6f7c4fd2aac2ee6dbf42c460 Frontiers in Earth Science, Vol 7 (2019) weathering carbonate travertine magnesium isotopes basalt Science Q article 2019 ftdoajarticles https://doi.org/10.3389/feart.2019.00006 2022-12-31T08:59:58Z Chemical weathering of silicate rocks is a key control on the long-term climate, via drawdown of atmospheric CO2. 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 δ26Mg increase from −2.37 to +0.43% with flow distance, as isotopically light travertine precipitates (δ26Mg = −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 δ26Mg 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. Article in Journal/Newspaper Eyjafjallajökull Directory of Open Access Journals: DOAJ Articles Frontiers in Earth Science 7 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
weathering carbonate travertine magnesium isotopes basalt Science Q |
spellingShingle |
weathering carbonate travertine magnesium isotopes basalt Science Q Philip A. E. Pogge von Strandmann Jonas Olsson Tu-Han Luu Sigurður R. Gislason Kevin W. Burton Using Mg Isotopes to Estimate Natural Calcite Compositions and Precipitation Rates During the 2010 Eyjafjallajökull Eruption |
topic_facet |
weathering carbonate travertine magnesium isotopes basalt Science Q |
description |
Chemical weathering of silicate rocks is a key control on the long-term climate, via drawdown of atmospheric CO2. 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 δ26Mg increase from −2.37 to +0.43% with flow distance, as isotopically light travertine precipitates (δ26Mg = −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 δ26Mg 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. |
format |
Article in Journal/Newspaper |
author |
Philip A. E. Pogge von Strandmann Jonas Olsson Tu-Han Luu Sigurður R. Gislason Kevin W. Burton |
author_facet |
Philip A. E. Pogge von Strandmann Jonas Olsson Tu-Han Luu Sigurður R. Gislason Kevin W. Burton |
author_sort |
Philip A. E. Pogge von Strandmann |
title |
Using Mg Isotopes to Estimate Natural Calcite Compositions and Precipitation Rates During the 2010 Eyjafjallajökull Eruption |
title_short |
Using Mg Isotopes to Estimate Natural Calcite Compositions and Precipitation Rates During the 2010 Eyjafjallajökull Eruption |
title_full |
Using Mg Isotopes to Estimate Natural Calcite Compositions and Precipitation Rates During the 2010 Eyjafjallajökull Eruption |
title_fullStr |
Using Mg Isotopes to Estimate Natural Calcite Compositions and Precipitation Rates During the 2010 Eyjafjallajökull Eruption |
title_full_unstemmed |
Using Mg Isotopes to Estimate Natural Calcite Compositions and Precipitation Rates During the 2010 Eyjafjallajökull Eruption |
title_sort |
using mg isotopes to estimate natural calcite compositions and precipitation rates during the 2010 eyjafjallajökull eruption |
publisher |
Frontiers Media S.A. |
publishDate |
2019 |
url |
https://doi.org/10.3389/feart.2019.00006 https://doaj.org/article/a4bf65fa6f7c4fd2aac2ee6dbf42c460 |
genre |
Eyjafjallajökull |
genre_facet |
Eyjafjallajökull |
op_source |
Frontiers in Earth Science, Vol 7 (2019) |
op_relation |
https://www.frontiersin.org/article/10.3389/feart.2019.00006/full https://doaj.org/toc/2296-6463 2296-6463 doi:10.3389/feart.2019.00006 https://doaj.org/article/a4bf65fa6f7c4fd2aac2ee6dbf42c460 |
op_doi |
https://doi.org/10.3389/feart.2019.00006 |
container_title |
Frontiers in Earth Science |
container_volume |
7 |
_version_ |
1766405342533517312 |