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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

Title: High reactivity of deep biota under anthropogenic CO2 injection into basalt
Author: Trias, Rosalia
Ménez, Bénédicte
le Campion, Paul
Zivanovic, Yvan
Lecourt, Léna
Lecoeuvre, Aurélien
Schmitt-Kopplin, Philippe
Uhl, Jenny
Gíslason, Sigurður Reynir
Alfreðsson, Helgi A.
... 8 more authors Show all authors
Date: 2017-10-20
Language: English
Scope: 1063
University/Institute: Háskóli Íslands
University of Iceland
School: Verkfræði- og náttúruvísindasvið (HÍ)
School of Engineering and Natural Sciences (UI)
Department: Jarðvísindastofnun (HÍ)
Institute of Earth Sciences (UI)
Series: Nature Communications;8(1)
ISSN: 2041-1723
DOI: 10.1038/s41467-017-01288-8
Subject: Carbon cycle; Climate-change mitigation; Microbial ecology; Basalt; Kolefnisjöfnun; Hlýnun jarðar; Vistfræði; Örverufræði
URI: https://hdl.handle.net/20.500.11815/527

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Trias, R., Ménez, B., le Campion, P., Zivanovic, Y., Lecourt, L., Lecoeuvre, A., . . . Gérard, E. (2017). High reactivity of deep biota under anthropogenic CO2 injection into basalt. Nature Communications, 8(1), 1063. doi:10.1038/s41467-017-01288-8


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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