Melezhik, V.A., Fallick, A.E., Rychanchik, D.V. and Kuznetsov, A.B. (2005) Palaeoproterozoic evaporites in Fennoscandia: implications for seawater sulphate, the rise of atmospheric oxygen and local amplification of the delta C-13 excursion. Terra Nova, 17(2), pp. 141-148. (doi: 10.1111/j.1365-3121.2005.00600.x)
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Publisher's URL: http://dx.doi.org/10.1111/j.1365-3121.2005.00600.x
Abstract
This paper addresses global oxygenation and establishment of a marine sulphate reservoir in the Palaeoproterozoic. We report syn-depositional, marine, anhydrite-containing pseudomorphs after Ca-sulphates as widespread throughout the Tulomozero Formation in the SE Fennoscandian Shield, implying that surface waters were oxidized and a large SO42- marine reservoir was developed as early as 2100 Ma. The Ca-sulphates and associated magnesite and halite precipitated syn-depositionally from oxidized, evolved and modified seawater in coastal playa, sabkha and intertidal flat settings. Sr-87/Sr-86 and delta(13)C of associated C-13-rich stromatolitic dolostones were environmentally controlled with the highest ratios occurring in playa and sabkha carbonates. The results imply that the Palaeoproterozoic delta(13)C(carb) excursion was amplified by 8% by local environmental factors and calls into question many observations of putative delta(13)C global signals reported previously from similar Palaeoproterozoic, evaporitic, dolostones. The local environmental amplification can explain a large regional and intercontinental delta(13)C discrepancy observed in synchronous carbonates.
Item Type: | Articles |
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Status: | Published |
Refereed: | Yes |
Glasgow Author(s) Enlighten ID: | Fallick, Professor Anthony |
Authors: | Melezhik, V.A., Fallick, A.E., Rychanchik, D.V., and Kuznetsov, A.B. |
Subjects: | Q Science > QE Geology |
College/School: | College of Science and Engineering > Scottish Universities Environmental Research Centre |
Journal Name: | Terra Nova |
Publisher: | Wiley-Blackwell Publishing Ltd. |
ISSN: | 0954-4879 |
ISSN (Online): | 1365-3121 |
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