@article{668775ae8a1a4bbeb0b89ad1f7c745aa,
title = "Formation of ordered dolomite in anaerobic photosynthetic biofilms",
abstract = "Dolomite enabled the preservation of fine microbial textures in some Archean and Proterozoic marine microbialites, but has rarely done so during the Phanerozoic. Here, we report precipitation of dolomite in anoxygenic photosynthetic biofilms grown under chemical conditions relevant for Archean seawater. Ordered dolomite nucleates primarily on the surfaces of photosynthetic cells when manganese(II) is present, and nanocrystals of disordered dolomite form on exopolymeric substances in microbial cultures grown either in the dark or without manganese. Dolomite nucleation and maturation on different surfaces in photosynthetically active cultures amended with 0.1-1 mM manganese(II) enables the preservation of biofilm textures at scales larger than individual microbial cells. This provides a new model for the preservation of microbial textures by dolomite before the oxygenation of the oceanic photic zone.",
author = "Mirna Daye and John Higgins and Tanja Bosak",
note = "Funding Information: We acknowledge support by the Simons Foundation Collaboration on the Origins of Life (grant 327126 to Bosak) and National Science Foundation Frontiers in Earth System Dynamics project #1338810 (to Bosak). Part of this work was performed in the Massachusetts Institute of Technology Center for Material Science and Engineering; part of the Materials Research Science and Engineering Center funded by the NSF under award number DMR-1419807 Funding Information: We acknowledge support by the Simons Foundation Collaboration on the Origins of Life (grant 327126 to Bosak) and National Science Foundation Frontiers in Earth System Dynamics project #1338810 (to Bosak). Part of this work was performed in the Massachusetts Institute of Technology Center for Material Science and Engineering; part of the Materials Research Science and Engineering Center funded by the NSF under award number DMR-1419807. Publisher Copyright: {\textcopyright} 2019 Geological Society of America.",
year = "2019",
month = jun,
day = "1",
doi = "10.1130/G45821.1",
language = "English (US)",
volume = "47",
pages = "509--512",
journal = "Geology",
issn = "0091-7613",
publisher = "Geological Society of America",
number = "6",
}