A revised 87Sr/86Sr curve for the Silurian: Implications for global ocean chemistry and the silurian timescale
Cramer BD, Munnecke A, Schofield DI, Haase K, Haase A, Munnecke A (2011)
Publication Language: English
Publication Type: Journal article, Original article
Publication year: 2011
Journal
Publisher: University of Chicago Press
Book Volume: 119
Pages Range: 335-349
DOI: 10.1086/660117
Abstract
Recent recalibration of the Silurian timescale and improved global chronostratigraphic correlation of Silurian strata significantly altered the Silurian 87Sr/86Sr curve and the temporal extent of available data. Whereas previous Silurian 87Sr/86Sr composites showed a generally monotonic increase throughout the Silurian, revisions to the Silurian timescale now require a major increase in the rate of change in 87Sr/86Sr at or near the onset of the Gorstian Age of the Ludlow Epoch. Similarly, improved chronostratigraphic correlations between Silurian outcrops on Anticosti Island, Canada, and Gotland, Sweden, indicate that the middle part of the Telychian Age, which is roughly 10%-15% of the total duration of the Silurian period, is undersampled and underrepresented in Silurian 87Sr/86Sr composites. A revised Silurian 87Sr/86Sr curve based on 241 new and published analyses confirms the significant increase in the rate of change of 87Sr/86Sr toward more radiogenic values near the base of the Ludlow Series. On the basis of these data, we propose that the rapid trend toward more radiogenic 87Sr/86Sr values is indicative of increased weathering of old sialic crust exposed during the Silurian uplift of portions of Baltica, Laurentia, and Avalonia. Importantly, however, the actual rate of change of 87Sr/86Sr will remain equivocal until the durations of Silurian epochs and ages are better constrained. © 2011 by The University of Chicago. All rights reserved.
Authors with CRIS profile
Axel Munnecke
Professur für Paläontologie (Schwerpunkt Faziesanalyse)
Karsten Haase
Lehrstuhl für Endogene Geodynamik
Alexandra Haase
Involved external institutions
United Kingdom (GB)
United States (USA) (US)How to cite
APA:
Cramer, B.D., Munnecke, A., Schofield, D.I., Haase, K., Haase, A., & Munnecke, A. (2011). A revised 87Sr/86Sr curve for the Silurian: Implications for global ocean chemistry and the silurian timescale. Journal of Geology, 119, 335-349. https://dx.doi.org/10.1086/660117
MLA:
Cramer, Bradley D., et al. "A revised 87Sr/86Sr curve for the Silurian: Implications for global ocean chemistry and the silurian timescale." Journal of Geology 119 (2011): 335-349.
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