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Carbon isotopic com...
Carbon isotopic composition of Frutexites in subseafloor ultramafic rocks
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- Neubeck, Anna (author)
- Uppsala universitet,Paleobiologi
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- Ivarsson, Magnus (author)
- Naturhistoriska riksmuseet,Enheten för paleobiologi,Swedish Museum Nat Hist, Dept Paleobiol, Stockholm, Sweden
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- Broman, Curt (author)
- Stockholms universitet,Institutionen för geologiska vetenskaper,Stockholm University,Stockholm Univ, Dept Geol Sci, Stockholm, Sweden
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- Lima-Zaloumis, Jonathan (author)
- School of Earth and Space Exploration, Arizona State University,Arizona State Univ, Sch Earth & Space Explorat, Tempe, AZ 85287 USA
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- Bach, Wolfgang (author)
- MARUM - Center for Marine Environmental Sciences, Universität Bremen,Univ Bremen, MARUM Ctr Marine Environm Sci, Bremen, Germany
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- Whitehouse, Martin (author)
- Naturhistoriska riksmuseet,Enheten för geovetenskap,Swedish Museum Nat Hist, Dept Earth Sci, Stockholm, Sweden
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(creator_code:org_t)
- 2021-05-14
- 2021
- English.
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In: Biogeochemistry. - : Springer. - 0168-2563 .- 1573-515X. ; 154:3, s. 525-536
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Abstract
Subject headings
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- Micrometer sized stromatolitic structures called Frutexites are features observed in samples from the deep subsurface, and hot-spring environments. These structures are comprised of fine laminations, columnar morphology, and commonly consist of iron oxides, manganese oxides, and/or carbonates. Although a biological origin is commonly invoked, few reports have shown direct evidence of their association with microbial activity. Here, we report for the first time the occurrence of subsurface manganese-dominated Frutexites preserved within carbonate veins in ultramafic rocks. To determine the biogenicity of these putative biosignatures, we analyzed their chemical and isotopic composition using Raman spectroscopy and secondary ion mass spectroscopy (SIMS). These structures were found to contain macromolecular carbon signal and have a depleted 13C/12C carbon isotopic composition of – 35.4 ± 0.50‰ relative to the entombing carbonate matrix. These observations are consistent with a biological origin for the observed Frutexites structures.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Annan geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Other Earth and Related Environmental Sciences (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geologi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geology (hsv//eng)
Keyword
- Earth-Surface Processes
- Water Science and Technology
- Environmental Chemistry
- Diversity of life
- Livets mångfald
- The changing Earth
- Den föränderliga jorden
Publication and Content Type
- ref (subject category)
- art (subject category)
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