Late Eocene-earliest Miocene Sr isotopic reference section of DSDP Site 73-522, supplement to: Reilly, Timothy J; Miller, Kenneth G; Feigenson, Mark D (2002): Latest Eocene-earliest Miocene Sr isotopic reference section, Site 522, eastern South Atlantic. Paleoceanography, 17(3), 18-1-18-9
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 segm...
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ftdatacite:10.1594/pangaea.844711 2023-05-15T13:33:00+02:00 Late Eocene-earliest Miocene Sr isotopic reference section of DSDP Site 73-522, supplement to: Reilly, Timothy J; Miller, Kenneth G; Feigenson, Mark D (2002): Latest Eocene-earliest Miocene Sr isotopic reference section, Site 522, eastern South Atlantic. Paleoceanography, 17(3), 18-1-18-9 Reilly, Timothy J Miller, Kenneth G Feigenson, Mark D 2002 application/zip https://dx.doi.org/10.1594/pangaea.844711 https://doi.pangaea.de/10.1594/PANGAEA.844711 en eng PANGAEA - Data Publisher for Earth & Environmental Science https://dx.doi.org/10.1029/2001pa000745 Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 CC-BY Deep Sea Drilling Project DSDP Ocean Drilling Program ODP Supplementary Collection of Datasets Collection article 2002 ftdatacite https://doi.org/10.1594/pangaea.844711 https://doi.org/10.1029/2001pa000745 2022-02-08T16:24:46Z 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. Article in Journal/Newspaper Antarc* Antarctic DataCite Metadata Store (German National Library of Science and Technology) Antarctic |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
Deep Sea Drilling Project DSDP Ocean Drilling Program ODP |
spellingShingle |
Deep Sea Drilling Project DSDP Ocean Drilling Program ODP Reilly, Timothy J Miller, Kenneth G Feigenson, Mark D Late Eocene-earliest Miocene Sr isotopic reference section of DSDP Site 73-522, supplement to: Reilly, Timothy J; Miller, Kenneth G; Feigenson, Mark D (2002): Latest Eocene-earliest Miocene Sr isotopic reference section, Site 522, eastern South Atlantic. Paleoceanography, 17(3), 18-1-18-9 |
topic_facet |
Deep Sea Drilling Project DSDP Ocean Drilling Program ODP |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Reilly, Timothy J Miller, Kenneth G Feigenson, Mark D |
author_facet |
Reilly, Timothy J Miller, Kenneth G Feigenson, Mark D |
author_sort |
Reilly, Timothy J |
title |
Late Eocene-earliest Miocene Sr isotopic reference section of DSDP Site 73-522, supplement to: Reilly, Timothy J; Miller, Kenneth G; Feigenson, Mark D (2002): Latest Eocene-earliest Miocene Sr isotopic reference section, Site 522, eastern South Atlantic. Paleoceanography, 17(3), 18-1-18-9 |
title_short |
Late Eocene-earliest Miocene Sr isotopic reference section of DSDP Site 73-522, supplement to: Reilly, Timothy J; Miller, Kenneth G; Feigenson, Mark D (2002): Latest Eocene-earliest Miocene Sr isotopic reference section, Site 522, eastern South Atlantic. Paleoceanography, 17(3), 18-1-18-9 |
title_full |
Late Eocene-earliest Miocene Sr isotopic reference section of DSDP Site 73-522, supplement to: Reilly, Timothy J; Miller, Kenneth G; Feigenson, Mark D (2002): Latest Eocene-earliest Miocene Sr isotopic reference section, Site 522, eastern South Atlantic. Paleoceanography, 17(3), 18-1-18-9 |
title_fullStr |
Late Eocene-earliest Miocene Sr isotopic reference section of DSDP Site 73-522, supplement to: Reilly, Timothy J; Miller, Kenneth G; Feigenson, Mark D (2002): Latest Eocene-earliest Miocene Sr isotopic reference section, Site 522, eastern South Atlantic. Paleoceanography, 17(3), 18-1-18-9 |
title_full_unstemmed |
Late Eocene-earliest Miocene Sr isotopic reference section of DSDP Site 73-522, supplement to: Reilly, Timothy J; Miller, Kenneth G; Feigenson, Mark D (2002): Latest Eocene-earliest Miocene Sr isotopic reference section, Site 522, eastern South Atlantic. Paleoceanography, 17(3), 18-1-18-9 |
title_sort |
late eocene-earliest miocene sr isotopic reference section of dsdp site 73-522, supplement to: reilly, timothy j; miller, kenneth g; feigenson, mark d (2002): latest eocene-earliest miocene sr isotopic reference section, site 522, eastern south atlantic. paleoceanography, 17(3), 18-1-18-9 |
publisher |
PANGAEA - Data Publisher for Earth & Environmental Science |
publishDate |
2002 |
url |
https://dx.doi.org/10.1594/pangaea.844711 https://doi.pangaea.de/10.1594/PANGAEA.844711 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
https://dx.doi.org/10.1029/2001pa000745 |
op_rights |
Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/pangaea.844711 https://doi.org/10.1029/2001pa000745 |
_version_ |
1766037575068286976 |