Mathematics – Logic
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.p51a1389m&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #P51A-1389
Mathematics
Logic
5225 Early Environment Of Earth, 5410 Composition (1060, 3672), 5455 Origin And Evolution
Scientific paper
The low metamorphic grade of Neoarchean banded iron formations (BIFs) from Abitibi, Québec, allows for the study of BIFs with minimal post-depositional alteration. Biological oxidation of ferrous iron has been suggested as a possible process by which BIFs form and if correct, organic remains of these microbial communities may be preserved within such sedimentary rocks. An investigation of the organic carbon in the BIFs from this region was performed to determine the mode of its occurrence and its association with apatite, which can form from the diagenetic maturation of organic remains. In a thin section of jasper-magnetite-chert BIF, two grains of apatite were found to exist in association with organic carbon, whereas the other grains are associated with carbonate, magnetite and hematite. These observations were confirmed via Raman spectroscopy and SEM. Carbonaceous material associated with apatite is characterized by D- and G-band peak intensities consistent with the metamorphic history of these rocks. Carbon isotopic compositions and concentrations were determined on several micro-drilled areas on various BIF thick sections, representing the mineral diversity of the samples. The δ13C values range between -15 to -45 ‰ (δ13Caverage = -29.2 ‰; n = 67), and the average organic content was 0.25% (range between 0.04 and 1.00 %;). Significant carbon isotope fractionations with large negative δ13C values could be biological in origin, but abiological processes could also be responsible for these ranges. Our observations in the studied BIFs collectively suggest that this organic matter was part of the original depositional environment and that apatite and carbonate likely formed during diagenesis.
Fogel Marilyn L.
Mine A. H.
Mueller Werner
Papineau Dominic
Steele Andrew
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