Biogenic Mn-oxides in subseafloor basalts

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doi: 10.1371/journal.pone.0128863
Author(s): Ivarsson, Magnus; Broman, Curt; Gustafsson, Hakan; Holm, Nils G.
Author Affiliation(s): Primary:
Swedish Museum of Natural History, Department of Palaeobiology, Stockholm, Sweden
Stockholm University, Sweden
Linkoping University, Sweden
Volume Title: PLoS One
Source: PLoS One, 2015(e0128863). Publisher: Public Library of Science, San Francisco, CA, United States. ISSN: 1932-6203
Note: In English. 45 refs.; illus., incl. 1 table
Summary: The deep biosphere of the subseafloor basalts is recognized as a major scientific frontier in disciplines like biology, geology, and oceanography. Recently, the presence of fungi in these environments has involved a change of view regarding diversity and ecology. Here, we describe fossilized fungal communities in vugs in subseafloor basalts from a depth of 936.65 metres below seafloor at the Detroit Seamount, Pacific Ocean. These fungal communities are closely associated with botryoidal Mn oxides composed of todorokite. Analyses of the Mn oxides by Electron Paramagnetic Resonance spectroscopy (EPR) indicate a biogenic signature. We suggest, based on mineralogical, morphological and EPR data, a biological origin of the botryoidal Mn oxides. Our results show that fungi are involved in Mn cycling at great depths in the seafloor and we introduce EPR as a means to easily identify biogenic Mn oxides in these environments.
Year of Publication: 2015
Research Program: ODP Ocean Drilling Program
Key Words: 02 Geochemistry; 05 Petrology, Igneous and Metamorphic; Basalts; Biochemistry; Biogenic processes; Communities; Detroit Seamount; EDS spectra; EPR spectra; Electron microscopy data; Emperor Seamounts; Fungi; Igneous rocks; Leg 197; Manganese; Metals; Mineral composition; North Pacific; Northwest Pacific; ODP Site 1204; Ocean Drilling Program; Oxidation; Oxides; Pacific Ocean; Raman spectra; SEM data; Spectra; Todorokite; Volcanic rocks; Vugs; West Pacific; X-ray spectra
Coordinates: N511200 N511200 E1674600 E1674600
Record ID: 2015081980
Copyright Information: GeoRef, Copyright 2018 American Geosciences Institute.