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Detailed Reference Information
Tikhomirova & Makarikhin 1993
Tikhomirova, M. and Makarikhin, V.V. (1993). Possible Reasons for the Delta-C-13 Anomaly of Lower Proterozoic Sedimentary Carbonates. Terra Nova 5(3): 244-248.
Detailed isotopic study (deltaC-13, deltaO-18) of Lower Proterozoic sedimentary carbonates from biostratigraphically dated successions in Karelia (Russia) revealed a large positive deltaC-13 anomaly (average deltaC-13-value constitutes approximately +10 parts per thousand PDB) at 2.3 Byr ago and a huge drop of deltaC-13-values in the subsequent 'black shale period' (2.2 Byr ago). These data are interpreted to be a result of large-scale changes in the oxygen content of the atmosphere. According to this model the positive carbon isotopic anomaly of sedimentary carbonates at about 2.3 Byr ago reflects a very high O2-content of the atmosphere at this time; the subsequent drop in deltaC-13-values equates with a sharp decrease of the O2-content of the atmosphere.
BACKGROUND DATA FILES
Abstract
Table 1
Isotope Analysis
Journal
Terra Nova
http://www.blackwell-synergy.com/member/institutions/issuelist.asp?journal=ter
Publisher
Blackwell Science Ltd.
Osney MeadUK
+44-1865-206206
+44-1865-721205
journals.cs@blacksci.co.uk
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