Journal article
A Revised 87Sr/86Sr Curve for the Silurian: Implications for Global Ocean Chemistry and the Silurian Timescale
The Journal of geology, Vol.119(4), pp.335-349
07/01/2011
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.
Details
- Title: Subtitle
- A Revised 87Sr/86Sr Curve for the Silurian: Implications for Global Ocean Chemistry and the Silurian Timescale
- Creators
- Bradley D Cramer - University of KansasAxel Munnecke - GeoZentrum Nordbayern, Fachgruppe Paläoumwelt, Universität Erlangen, Loewenichstraβe 28, Erlangen D-91054, GermanyDavid I Schofield - British Geological SurveyKarsten M Haase - GeoZentrum Nordbayern, Fachgruppe Krustendynamik, Universität Erlangen, Schloβgarten 5, Erlangen D-91054, GermanyAlexandra Haase-Schramm - Leibniz-Institut für Meereswissenschaften IfM-GEOMAR, Wischhofstraβe 1-3, Kiel 24148, Germany
- Resource Type
- Journal article
- Publication Details
- The Journal of geology, Vol.119(4), pp.335-349
- Publisher
- University of Chicago Press
- DOI
- 10.1086/660117
- ISSN
- 0022-1376
- eISSN
- 1537-5269
- Language
- English
- Date published
- 07/01/2011
- Academic Unit
- Office Of The Provost; International Programs; Earth and Environmental Sciences
- Record Identifier
- 9984229162902771
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