Geomicrobiology of a Weathering Crust from an Impact Crater and a Hypothesis for its Formation

Autor:	Andrew G. Tindle, Maurits Lindström, Charles S. Cockell, Vala Ragnarsdottir, Jonathan S. Watson, Niki Kennerley, Erik Sturkell, Sieglinde Ott
Rok vydání:	2007
Předmět:	Calcite Soil production function Honeycomb weathering Mineralogy Weathering Crust Microbiology chemistry.chemical_compound chemistry Impact crater Earth and Planetary Sciences (miscellaneous) Spheroidal weathering Environmental Chemistry Chlorite Geology General Environmental Science
Zdroj:	Geomicrobiology Journal. 24:425-440
ISSN:	1521-0529 0149-0451
Popis:	Understanding the role of microbe-mineral interactions in rock weathering is vital to an understanding of nutrient availability to the biosphere and, in so far as weathering influences carbon dioxide drawdown, climate control. We studied a weathering crust on a resurge tsunami deposit (Loftarstone) from the ∼ 455 Ma old Lockne impact crater, central Sweden with an integrated approach using XRD, electron microprobe analysis, SEM-EDS and GCMS analysis of organics. The lichens and fungal hyphae network preferentially weather the chlorite in the Loftarstone compared to feldspars and quartz. We demonstrate, using a fungal isolate (identified by ITS sequencing), that biologically induced dissolution of the calcite component produces cavities which increase the surface area of interaction between the biota and the rock substrate. The weathering crust exfoliates from the rock surface in sheets, which we attribute to the dissolution of the calcite matrix. We present a hypothesis for the crust development. As well ...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::88070cd7963936670b5b324a9101940e https://doi.org/10.1080/01490450701436513 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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