High reactivity of deep biota under anthropogenic CO2 injection into basalt

Rosalia Trias, Bénédicte Ménez (), Paul Campion, Yvan Zivanovic, Léna Lecourt, Aurélien Lecoeuvre, Philippe Schmitt-Kopplin, Jenny Uhl, Sigurður R. Gislason, Helgi A. Alfreðsson, Kiflom G. Mesfin, Sandra Ó. Snæbjörnsdóttir, Edda S. Aradóttir, Ingvi Gunnarsson, Juerg M. Matter, Martin Stute, Eric H. Oelkers and Emmanuelle Gérard ()
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Rosalia Trias: Univ. Paris Diderot, CNRS UMR 7154
Bénédicte Ménez: Univ. Paris Diderot, CNRS UMR 7154
Paul Campion: Univ. Paris Diderot, CNRS UMR 7154
Yvan Zivanovic: Univ. Paris-Sud
Léna Lecourt: Univ. Paris Diderot, CNRS UMR 7154
Aurélien Lecoeuvre: Univ. Paris Diderot, CNRS UMR 7154
Philippe Schmitt-Kopplin: Research Unit Analytical Biogeochemistry
Jenny Uhl: Research Unit Analytical Biogeochemistry
Sigurður R. Gislason: University of Iceland, Sturlugötu 7
Helgi A. Alfreðsson: University of Iceland, Sturlugötu 7
Kiflom G. Mesfin: University of Iceland, Sturlugötu 7
Sandra Ó. Snæbjörnsdóttir: University of Iceland, Sturlugötu 7
Edda S. Aradóttir: Reykjavik Energy
Ingvi Gunnarsson: Reykjavik Energy
Juerg M. Matter: University of Southampton
Martin Stute: Columbia University
Eric H. Oelkers: University of Iceland, Sturlugötu 7
Emmanuelle Gérard: Univ. Paris Diderot, CNRS UMR 7154

Nature Communications, 2017, vol. 8, issue 1, 1-14

Abstract: 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.

Date: 2017
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DOI: 10.1038/s41467-017-01288-8

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