Reilly, Timothy J; Miller, Kenneth G; Feigenson, Mark D (2002): Late Eocene-earliest Miocene Sr isotopic reference section of DSDP Site 73-522 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.844711, Supplement to: Reilly, TJ et al. (2002): Latest Eocene-earliest Miocene Sr isotopic reference section, Site 522, eastern South Atlantic. Paleoceanography, 17(3), 18-1-18-9, https://doi.org/10.1029/2001PA000745
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Abstract:
We present a revised calibration of Sr isotopes to the geomagnetic polarity timescale (GPTS) using closely spaced (~0.15 m.y. resolution) samples from the classic uppermost Eocene through lowermost Miocene section at Site 522, eastern South Atlantic. The Sr isotopic data are fit with two linear segments with a sharp change in slope at circa 27.5 Ma from 0.000038/m.y. (27.5 to 34.4 Ma) to 0.000051/m.y. (23.8 to 27.5 Ma). Regression analysis indicates that stratigraphic resolution ranges from ±1 m.y. (for one analysis) to ±0.6 m.y. (for three analyses) for the younger interval and ±1.2 m.y. (for one analysis) to ±0.7 m.y. (for three analyses) for the older interval, representing an increase in resolution from previous studies of ±1-2 m.y. The paleoceanographic significance of this change in slope is unclear. It occurs during an interval of intermittent Antarctic glaciation, between the Oi2a and Oi2b glaciations. The subsequent interval from circa 27 to 24 Ma appears to be an interval of minimal glaciation. Thus this observation does not support previous suggestions that increases in rates of Sr isotopic change are directly associated with the frequency of Antarctic glaciations. Rather, the increase in slope may be related to increased weathering associated with the "mid-Oligocene" glaciation.
Project(s):
Deep Sea Drilling Project (DSDP)
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -45.315500 * Median Longitude: -1.014775 * South-bound Latitude: -64.517000 * West-bound Longitude: -5.129700 * North-bound Latitude: -26.114000 * East-bound Longitude: 3.100150
Date/Time Start: 1980-05-06T00:00:00 * Date/Time End: 1987-01-19T00:00:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
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Datasets listed in this publication series
- Reilly, TJ; Miller, KG; Feigenson, MD (2002): (Table 1) Sr isotopic ratios of DSDP Site 73-522. https://doi.org/10.1594/PANGAEA.844709
- Reilly, TJ; Miller, KG; Feigenson, MD (2002): (Table 2) Revised age model of ODP Site 113-689. https://doi.org/10.1594/PANGAEA.844710