Melezhik, V.A., Gorokhov, I.M., Kuznetsov, A.B. and Fallick, A.E. (2001) Chemostratigraphy of Neoproterozoic carbonates: implications for 'blind dating'. Terra Nova, 13(1), pp. 1-11. (doi: 10.1046/j.1365-3121.2001.00318.x)
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Terra_Nova_13(1)_1_-_11.pdf 405kB |
Publisher's URL: http://dx.doi.org/10.1046/j.1365-3121.2001.00318.x
Abstract
The delta C-13(carb) and Sr-87/Sr-86 secular variations in Neoproteozoic seawater have been used for the purpose of 'isotope stratigraphy' but there are a number of problems that can preclude its routine use. In particular, it cannot be used with confidence for 'blind dating'. The compilation of isotopic data on carbonate rocks reveals a high level of inconsistency between various carbon isotope age curves constructed for Neoproteozoic seawater, caused by a relatively high frequency of both global and local delta C-13(carb) fluctuations combined with few reliable age determinations. Further complication is caused by the unresolved problem as to whether two or four glaciations, and associated negative delta C-13(carb) excursions, can be reliably documented. Carbon isotope stratigraphy cannot be used alone for geological correlation and 'blind dating'. Strontium isotope stratigraphy is a more reliable and precise tool for stratigraphic correlations and indirect age determinations. Combining strontium and carbon isotope stratigraphy, several discrete ages within the 590-544 Myr interval, and two age-groups at 660-610 and 740-690 Myr can be resolved.
Item Type: | Articles |
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Status: | Published |
Refereed: | Yes |
Glasgow Author(s) Enlighten ID: | Fallick, Professor Anthony |
Authors: | Melezhik, V.A., Gorokhov, I.M., Kuznetsov, A.B., and Fallick, A.E. |
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 |
Copyright Holders: | © Blackwell Publishing |
First Published: | First published in Terra Nova 13(1):1-11 |
Publisher Policy: | Reproduced in accordance with the copyright policy of the publisher |
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