Heavy carbon in two-billion-year-old marbles from Lofoten-Vesteralen, Norway; implications for the Precambrian carbon cycle

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doi: 10.1016/0016-7037(89)90216-0
Authors:Baker, A. J.; Fallick, A. E.
Author Affiliations:Primary:
Grant Inst. Geol., Edinburgh, United Kingdom
Scott. Univ. Reactor Res. Cent., United Kingdom
Volume Title:Geochimica et Cosmochimica Acta
Source:Geochimica et Cosmochimica Acta, 53(5), p.1111-1115. Publisher: Pergamon, Oxford, International. ISSN: 0016-7037
Publication Date:1989
Note:In English. 31 refs.; illus. incl. 1 table, sketch map
Summary:Carbon and O isotopic compositions of calcites from marble, which has been subjected to metamorphism at approx 800 degrees C, are reported. High delta13C values of <=12 per mille(PDB) correlate with high delta18O (<=25 per mille ; SMOW), and suggest that pre-metamorphic delta13C values were >10 per mille over a large area. The results are consistent with one or many world-wide excursions in delta13C or frequent excursions localized in marginal basins; published data indicate that deposition of limestones with isotopically heavy C was common at about 2000 m.y. perhaps due to an increase in fO caused by increased primary organic production. This excursion may have been accompanied by a large increase in atmosphere and ocean O contents. [R.K.H.]
Subjects:C-13/C-12; Calcite; Carbon; Carbonates; Geochemical cycle; Geochemistry; Graphite; Isotopes; Marbles; Metamorphic rocks; Native elements; O-18/O-16; Oxygen; Paleo-oceanography; Paleoatmosphere; Precambrian; Stable isotopes; Europe; Norway; Scandinavia; Western Europe; Lofoten-Vesteralen; Ratios
Abstract Numbers:89M/4482
Record ID:1989045971
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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