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Hydrothermal and Cold Spring Water and Primary Productivity Effects on Magnesium Isotopes: Lake Myvatn, Iceland

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dc.contributor Háskóli Íslands
dc.contributor University of Iceland
dc.contributor.author Pogge von Strandmann, Philip A. E.
dc.contributor.author Burton, Kevin W.
dc.contributor.author Opfergelt, Sophie
dc.contributor.author Eiríksdóttir, Eydís Salóme
dc.contributor.author Murphy, Melissa J.
dc.contributor.author Einarsson, Árni
dc.contributor.author Gíslason, Sigurður R.
dc.date.accessioned 2021-01-14T14:50:18Z
dc.date.available 2021-01-14T14:50:18Z
dc.date.issued 2020-04-30
dc.identifier.citation Pogge von Strandmann PAE, Burton KW, Opfergelt S, Eiríksdóttir ES, Murphy MJ, Einarsson A and Gislason SR (2020) Hydrothermal and Cold Spring Water and Primary Productivity Effects on Magnesium Isotopes: Lake Myvatn, Iceland. Frontiers in Earth Science 8:109. doi: 10.3389/feart.2020.00109
dc.identifier.issn 2296-6463
dc.identifier.uri https://hdl.handle.net/20.500.11815/2370
dc.description Publisher's version (útgefin grein)
dc.description.abstract Lake Myvatn, Iceland, is one of the most biologically productive lakes in the northern hemisphere, despite seasonal ice cover. Hydrothermal and groundwater springs make up the dominant source to this lake, and we investigate their Mg isotope ratio to assess the effect of mid-ocean ridge hydrothermal springs, which are the primary modern sink of seawater magnesium. We also examine a time series in the only outflow from this lake, the Laxa River, to assess the effects of seasonal primary productivity on Mg isotopes. In the hydrothermal waters, there is a clear distinction between cold waters (largely unfractionated from primary basalt) and relatively hot waters, which exhibit over 1‰ fractionation, with consequences for the oceanic mass balance if the hydrothermal removal of Mg is not fully quantitative. The outflow Mg isotopes are similar to basalts (δ26Mg = −0.2 to −0.3) during winter but reach a peak of ∼0‰ in August. This fractionation corresponds to calcite precipitation during summer in Lake Myvatn, preferentially taking up light Mg isotopes and driving the residual waters isotopically heavy as observed, meaning that overall the lake is a CO2 sink.
dc.description.sponsorship PP and the analyses were funded by NERC grant NE/I020571/2, and PP and MM are also supported by ERC Consolidator grant 682760 CONTROLPASTCO2.
dc.format.extent 109
dc.language.iso en
dc.publisher Frontiers Media SA
dc.relation.ispartofseries Frontiers in Earth Science;8
dc.rights info:eu-repo/semantics/openAccess
dc.subject Carbonate chemistry
dc.subject Groundwater
dc.subject Hydrothermal spring
dc.subject Isotope geochemistry
dc.subject Phytoplankton
dc.subject Weathering
dc.subject Jarðhitasvæði
dc.subject Ferskvatn
dc.subject Jarðeðlisfræði
dc.subject Veðrun
dc.title Hydrothermal and Cold Spring Water and Primary Productivity Effects on Magnesium Isotopes: Lake Myvatn, Iceland
dc.type info:eu-repo/semantics/article
dcterms.license 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.
dc.description.version Peer Reviewed
dc.identifier.journal Frontiers in Earth Science
dc.identifier.doi 10.3389/feart.2020.00109
dc.relation.url https://www.frontiersin.org/article/10.3389/feart.2020.00109/full
dc.contributor.department Jarðvísindastofnun (HÍ)
dc.contributor.department Institute of Earth Sciences (UI)
dc.contributor.department Líf- og umhverfisvísindastofnun (HÍ)
dc.contributor.department Institute of Life and Environmental Sciences (UI)
dc.contributor.department Náttúrurannsóknastöðin við Mývatn (HÍ)
dc.contributor.department Mývatn Research Station (UI)
dc.contributor.school Verkfræði- og náttúruvísindasvið (HÍ)
dc.contributor.school School of Engineering and Natural Sciences (UI)

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