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Zircon U-Pb ages for the Early Cambrian time-scale
Abstract
Single zircons from two Early Cambrian volcanic horizons have been analysed using the SHRIMP ion microprobe. Full details of the analytical procedures and data reduction are given. Zircons from tuff within the Lie de Vin Formation, near Tiout, Morocco, show little spread in U-Pb age and have a mean value of 521 ± 7 Ma (2σ). Those from a bentonite within unit 5 of the Meishucun section near Kunming, southern China, show relatively dispersed U-Pb ages, revealing the presence of both detrital or xenocrystic grains as well as areas within grains that have lost radiogenic Pb. The main population has a mean age of 525 ± 7 Ma, but a mean 207 Pb/ 206 Pb age of 539 ± 34 Ma which is a maximum estimate for the bentonite age. These results conflict with previous Rb-Sr whole rock ages of c. 580 Ma for overlying Cambrian shales at Meishucun, and c. 570 Ma for Atdabanian shales from the E. Yangtse Gorges area.
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Cited by
Wilde, S. A., Valley, J. W., Peck, W. H., & Graham, C. M. (2001) · Nature · doi:10.1038/35051550 · Cited by 1,744
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Xiao, S., Zhang, Y., & Knoll, A. H. (1998) · Nature · doi:10.1038/35318 · Cited by 783
Biostratigraphic and Geochronologic Constraints on Early Animal Evolution
Grotzinger, J. P., Bowring, S. A., Saylor, B. Z., & Kaufman, A. J. (1995) · Science · doi:10.1126/science.270.5236.598 · Cited by 701
The earliest Cambrian record of animals and ocean geochemical change
Maloof, A. C., Porter, S. M., Moore, J. L., Dudas, F. O., Bowring, S. A., Higgins, J. A., Fike, D. A., & Eddy, M. P. (2010) · Geological Society of America Bulletin · doi:10.1130/b30346.1 · Cited by 419
The fossil record and the early evolution of the Metazoa
Morris, S. C. (1993) · Nature · doi:10.1038/361219a0 · Cited by 389
Metadata
- Authors
- COMPSTON, W., WILLIAMS, I. S., KIRSCHVINK, J. L., ZICHAO, Z., & GUOGAN, M. A.
- Venue
- Journal of the Geological Society
- Publisher
- Geological Society of London
- Published
- 1992-03
- Volume
- 149
- Issue
- 2
- Pages
- 171-184
- ISSN
- 0016-7649 (ISSN-L)
- 2041-479X
- OpenAlex
- W2080522683
- Cited by
- 1,135
- References
- 0
- FWCI
- 16.58
- Type
- journal article
- Language
- en
- Open access
- closed
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- COMPSTON, W., WILLIAMS, I. S., KIRSCHVINK, J. L., ZICHAO, Z., & GUOGAN, M. A. (1992). Zircon U-Pb ages for the Early Cambrian time-scale. Journal of the Geological Society. https://doi.org/10.1144/gsjgs.149.2.0171
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