ISSN 1472-4669 · November 2017 · Volume 15 · Issue 6www.geobiol.com

Hot carbonates and iron oxides

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Editor in ChiefKurt Konhauser University of Alberta, Canadakurtk@ualberta.ca

Subject EditorsAncient Earth SystemsRoger BuickUniversity of Washington, USAbuick@ess.washington.edu

Ancient Environments and BiosedimentologyNoah PlanavskyYale University, USAnoah.planavsky@yale.edu

Animal Paleobiology and TaphonomyNicholas Butterfield University of Cambridge, UK njb1005@esc.cam.ac.uk

Environmental GeomicrobiologyNathan Yee Rutgers University, USAnyee@envsci.rutgers.edu

Geomicrobiology and Trace Metal DynamicsAndreas KapplerEberhard-Karls-University Tübingen, Germanyandreas.kappler@uni-tuebingen.de

Microbe-Mineral InteractionsKarim BenzeraraUniversity Pierre et Marie Curie, Francekarim.benzerara@impmc.upmc.fr

Modern and Ancient Microbial SystemsTanja BosakMassachusetts Institute of Technology, USAtbosak@mit.edu

Modern Microbial EcologyAnna-Louise ReysenbachPortland State University, USA reysenbacha@pdx.edu

Molecular GeomicrobiologyGregory DickUniversity of Michigan, USAgdick@umich.edu

Organic and Molecular BiogeochemistryAnn PearsonHarvard University, USApearson@eps.harvard.edu

Plant Paleobiology and Ancient AtmospheresDavid BeerlingUniversity of Sheffield, UK d.j.beerling@sheffield.ac.uk

Stable Isotope BiogeochemistryDavid JohnstonHarvard University, USAjohnston@eps.harvard.edu

Editorial Advisory BoardDaniel Alessi, Canada Jake Bailey, USANeil Banerjee, CanadaAndrey Bekker, USAJennifer Biddle, USAAntje Boetius, GermanyEric Boyd, USASusan Brantley, USAJochen Brocks, AustraliaDon Canfield, DenmarkDavid Catling, USAClara Chan, USAMark Claire, UKSean Crowe, CanadaAnne Dekas, USAChristophe Dupraz, SwedenJames Farquhar, USADavid Fike, USAWoody Fischer, USADanielle Fortin, CanadaJamie Foster, USAJames Fredrickson, USAMurray Gingras, CanadaJennifer Glass, USAJeff Gralnick, USA

Trinity Hamilton, USABrian Hedlund, USAChristopher House, USAAndy Knoll, USALee Kump, USAMark LaFlamme, CanadaStefan Lalonde, FranceKevin Lepot, FranceGordon Love, USATimothy Lyons, USANicola McLoughlin, South AfricaDianne Newman, USAVictoria Orphan, USADominic Papineau, UKCamille Partin, CanadaPascal Philippot, FranceSusannah Porter, USASimon Poulton, UKSara Pruss, USAJason Raymond, USARob Riding, USAJennifer Roberts, USAEric Roden, USAJames Schiffbauer, USAMatthew Schrenk, USAAlex Sessions, USARussell Shapiro, USANathan Sheldon, USAOrit Sivan, IsraelJohn Spear, USAEric Sperling, USAEva Stueken, UKKen Sugitani, JapanRoger Summons, USADawn Sumner, USALidya Tarhan, USAAndreas Teske, USAVolker Thiel, GermanyMike Tice, USAPieter Visscher, USADavid Wacey, UKLesley Warren, CanadaPaula Welander, USAKenneth Wiliford, USAShucheng Xie, ChinaAubrey Zerkle, UK

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CoverAt a moderately thermophilic, iron rich hot spring in Akita prefecture Japan, mineral deposits rich in iron oxides but low in organic carbon accumulate in a process analogous to the deposition of Proterozoic iron formations after the Great Oxygenation Event. Microbial ferrous iron oxidation appears to be accomplished by thermotolerant strains of Gallionellaceae and Mariprofundaceae. As the spring water flows downstream, carbon dioxide degasses and aragonite precipitates. These processes occur so rapidly that even bubbles of degassing carbon dioxide become mineralized with encrusting aragonite and iron oxide, and in this case a dragonfly is also a site of mineralization. Photo courtesy of Lewis Ward.

Production Editor: Jenifer Alexander (email: gbi@wiley.com)

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