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The Precambrian-Cambrian boundary: Magnetostratigraphy and Carbon Isotopes resolve correlation problems between Siberia, Morocco, and South China

Kirschvink, Joseph L. and Magaritz, Mordeckai and Ripperdan, Robert L. and Zhuravlev, A. Yu. and Rozanov, A. Yu (1991) The Precambrian-Cambrian boundary: Magnetostratigraphy and Carbon Isotopes resolve correlation problems between Siberia, Morocco, and South China. GSA Today, 1 (4). pp. 69-91. ISSN 1052-5173.

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Late Proterozoic and Early Cambrian age platform carbonates from the Siberian platform now have the most complete records of paleontological, magnetostratigraphic, and δ^(13)C variations preserved anywhere on Earth. New carbon isotopic data from Siberia extends the known pattern up through the first half of Early Cambrian time (the Late Tommotian up through the middle of the Atdabanian stage). These data reveal a fourth δ^(13)C cycle in the Siberian Precambrian/Cambrian boundary isotope curve, and in conjunction with the magnetostratigraphy provide two nonbiological techniques for testing proposed correlations. Similar patterns are present in both the carbon isotope and magnetic reversal stratigraphies in the upper Lie de Vin formation of Morocco, confirming recent biostratigraphic work. A unique match is also present in the comparison between Siberia and an important locality near Kunming in south China, and implies that at least half of the record of Atdabanian time is missing there. Hence, the Chinese section is not suitable as an international stratotype for the Precambrian/Cambrian boundary.

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Kirschvink, Joseph L.0000-0001-9486-6689
Additional Information:© 1991 Geological Society of America. Supported by National Science Foundation Grants EAR-8721391 and PYI-8351370. We thank Stanley Awramik for additional samples from the Lie de Vin formation of Morocco; Andrew Latham, Robert Riding, Michael Purucker, A. Faure-Muret, and the late George Choubert for assistance in the field sampling in Morocco; R. Selnikov and Z. Pearl for mass spectrometric measurements; and K. Bijan for X-ray determinations. This work is a contribution to International Geological Correlation Program Projects 216 (Global Bio-events) and 303 (Event Stratigraphy of the Precambrian-Cambrian Boundary). California Institute of Technology Division of Geological and Planetary Sciences Contribution 4880.
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Caltech Division of Geological and Planetary Sciences4880
International Geological Correlation Program Project216
International Geological Correlation Program Project303
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ID Code:36568
Deposited By: Tony Diaz
Deposited On:25 Jan 2013 21:36
Last Modified:03 Mar 2020 13:01

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