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High reactivity of deep biota under anthropogenic CO2 injection into basalt

High reactivity of deep biota under anthropogenic CO2 injection into basalt
High reactivity of deep biota under anthropogenic CO2 injection into basalt
Basalts are recognized as one of the major habitats on Earth, harboring diverse and active microbial populations. Inconsistently, this living component is rarely considered in engineering operations carried out in these environments. This includes carbon capture and storage (CCS) technologies that seek to offset anthropogenic CO2 emissions into the atmosphere by burying this greenhouse gas in the subsurface. Here, we show that deep ecosystems respond quickly to field operations associated with CO2 injections based on a microbiological survey of a basaltic CCS site. Acidic CO2-charged groundwater results in a marked decrease (by ~ 2.5–4) in microbial richness despite observable blooms of lithoautotrophic iron-oxidizing Betaproteobacteria and degraders of aromatic compounds, which hence impact the aquifer redox state and the carbon fate. Host-basalt dissolution releases nutrients and energy sources, which sustain the growth of autotrophic and heterotrophic species whose activities may have consequences on mineral storage.
Trias, Rosalia
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Ménez, Bénédicte
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le Campion, Paul
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Zivanovic, Yvan
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Lecourt, Léna
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Lecoeuvre, Aurélien
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Schmitt-Kopplin, Philippe
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Uhl, Jenny
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Gislason, Sigurður R.
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Alfreðsson, Helgi A.
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Mesfin, Kiflom G.
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Snæbjörnsdottir, Sandra Ó
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Aradóttir, Edda S.
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Gunnarsson, Ingvi
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Matter, Juerg M.
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Stute, Martin
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Oelkers, Eric H.
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Gérard, Emmanuelle
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Trias, Rosalia
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Ménez, Bénédicte
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le Campion, Paul
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Zivanovic, Yvan
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Lecourt, Léna
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Lecoeuvre, Aurélien
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Schmitt-Kopplin, Philippe
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Uhl, Jenny
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Gislason, Sigurður R.
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Alfreðsson, Helgi A.
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Mesfin, Kiflom G.
9c36a273-ef37-452c-bdbe-e13a36632ac1
Snæbjörnsdottir, Sandra Ó
802c19ba-2778-48b7-81ad-9a78a482c38c
Aradóttir, Edda S.
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Gunnarsson, Ingvi
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Matter, Juerg M.
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Stute, Martin
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Oelkers, Eric H.
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Gérard, Emmanuelle
db46fc05-bd11-4ada-8507-7212b1ccde07

Trias, Rosalia, Ménez, Bénédicte, le Campion, Paul, Zivanovic, Yvan, Lecourt, Léna, Lecoeuvre, Aurélien, Schmitt-Kopplin, Philippe, Uhl, Jenny, Gislason, Sigurður R., Alfreðsson, Helgi A., Mesfin, Kiflom G., Snæbjörnsdottir, Sandra Ó, Aradóttir, Edda S., Gunnarsson, Ingvi, Matter, Juerg M., Stute, Martin, Oelkers, Eric H. and Gérard, Emmanuelle (2017) High reactivity of deep biota under anthropogenic CO2 injection into basalt. Nature Communications, 8 (1), [1063]. (doi:10.1038/s41467-017-01288-8).

Record type: Article

Abstract

Basalts are recognized as one of the major habitats on Earth, harboring diverse and active microbial populations. Inconsistently, this living component is rarely considered in engineering operations carried out in these environments. This includes carbon capture and storage (CCS) technologies that seek to offset anthropogenic CO2 emissions into the atmosphere by burying this greenhouse gas in the subsurface. Here, we show that deep ecosystems respond quickly to field operations associated with CO2 injections based on a microbiological survey of a basaltic CCS site. Acidic CO2-charged groundwater results in a marked decrease (by ~ 2.5–4) in microbial richness despite observable blooms of lithoautotrophic iron-oxidizing Betaproteobacteria and degraders of aromatic compounds, which hence impact the aquifer redox state and the carbon fate. Host-basalt dissolution releases nutrients and energy sources, which sustain the growth of autotrophic and heterotrophic species whose activities may have consequences on mineral storage.

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Accepted/In Press date: 1 September 2017
e-pub ahead of print date: 20 October 2017
Published date: December 2017

Identifiers

Local EPrints ID: 415343
URI: http://eprints.soton.ac.uk/id/eprint/415343
PURE UUID: 29c3a850-dfb4-42d8-8520-63229dc8aa84

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Date deposited: 07 Nov 2017 17:30
Last modified: 06 Oct 2020 22:31

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