globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gbi.12128
Scopus记录号: 2-s2.0-84927082882
论文题名:
Biogenicity of an early quaternary iron formation, Milos Island, Greece
作者: Chi Fru E.; Ivarsson M.; Kilias S.P.; Frings P.J.; Hemmingsson C.; Broman C.; Bengtson S.; Chatzitheodoridis E.
刊名: Geobiology
ISSN: 1472-4677
EISSN: 1472-4669
出版年: 2015
卷: 13, 期:3
起始页码: 225
结束页码: 244
语种: 英语
Scopus关键词: biostratigraphy ; carbon fixation ; fossil assemblage ; microfossil ; micropaleontology ; outcrop ; petrography ; Quaternary ; Greece ; Milos [Southern Aegean] ; Southern Aegean ; iron ; biogenesis ; chemistry ; fossil ; geographic and geological phenomena ; Greece ; microbiology ; sediment ; Biogenesis ; Fossils ; Geologic Sediments ; Geological Processes ; Greece ; Iron
Scopus学科分类: Earth and Planetary Sciences: General Earth and Planetary Sciences ; Environmental Science: General Environmental Science ; Agricultural and Biological Sciences: Ecology, Evolution, Behavior and Systematic
英文摘要: A ~2.0-million-year-old shallow-submarine sedimentary deposit on Milos Island, Greece, harbours an unmetamorphosed fossiliferous iron formation (IF) comparable to Precambrian banded iron formations (BIFs). This Milos IF holds the potential to provide clues to the origin of Precambrian BIFs, relative to biotic and abiotic processes. Here, we combine field stratigraphic observations, stable isotopes of C, S and Si, rock petrography and microfossil evidence from a ~5-m-thick outcrop to track potential biogeochemical processes that may have contributed to the formation of the BIF-type rocks and the abrupt transition to an overlying conglomerate-hosted IF (CIF). Bulk δ13C isotopic compositions lower than -25‰ provide evidence for biological contribution by the Calvin and reductive acetyl-CoA carbon fixation cycles to the origin of both the BIF-type and CIF strata. Low S levels of ~0.04 wt.% combined with δ34S estimates of up to ~18‰ point to a non-sulphidic depository. Positive δ30Si records of up to +0.53‰ in the finely laminated BIF-type rocks indicate chemical deposition on the seafloor during weak periods of arc magmatism. Negative δ30Si data are consistent with geological observations suggesting a sudden change to intense arc volcanism potentially terminated the deposition of the BIF-type layer. The typical Precambrian rhythmic rocks of alternating Fe- and Si-rich bands are associated with abundant and spatially distinct microbial fossil assemblages. Together with previously proposed anoxygenic photoferrotrophic iron cycling and low sedimentary N and C potentially connected to diagenetic denitrification, the Milos IF is a biogenic submarine volcano-sedimentary IF showing depositional conditions analogous to Archaean Algoma-type BIFs. © 2015 John Wiley & Sons Ltd.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/85160
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作者单位: Department of Geological Sciences, Stockholm University, Stockholm, Sweden; Department of Palaeobiology and Nordic Centre for Earth Evolution (NordCEE), Swedish Museum of Natural History, Stockholm, Sweden; Department of Economic Geology and Geochemistry, Faculty of Geology and Geoenvironment, University of Athens, Zographou, Athens, Greece; Department of Geology, Lund University, Lund, Sweden; Department of Geological Sciences, National Technical University of Athens, School of Metallurgy and Mining Engineering, Zographou Campus, Athens, Greece

Recommended Citation:
Chi Fru E.,Ivarsson M.,Kilias S.P.,et al. Biogenicity of an early quaternary iron formation, Milos Island, Greece[J]. Geobiology,2015-01-01,13(3)
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