Wilkens, RH;
Westerhold, T;
Drury, AJ;
Lyle, M;
Gorgas, T;
Tian, J;
(2017)
Revisiting the Ceara Rise, equatorial Atlantic Ocean: isotope stratigraphy of ODP Leg 154 from 0 to 5Ma.
Climate of the Past
, 13
(7)
pp. 779-793.
10.5194/cp-13-779-2017.
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Abstract
Isotope stratigraphy has become the method of choice for investigating both past ocean temperatures and global ice volume. Lisiecki and Raymo (2005) published a stacked record of 57 globally distributed benthic δ18O records versus age (LR04 stack). In this study LR04 is compared to high-resolution records collected at all of the sites drilled during ODP Leg 154 on the Ceara Rise, in the western equatorial Atlantic Ocean. Newly developed software is used to check data splices of the Ceara Rise sites and better align out-of-splice data with in-splice data. Core images recovered from core table photos are depth and age scaled and greatly assist in the data analysis. The entire splices of ODP sites 925, 926, 927, 928 and 929 were reviewed. Most changes were minor although several were large enough to affect age models based on orbital tuning. A Ceara Rise composite record of benthic δ18O is out of sync with LR04 between 1.80 and 1.90Ma, where LR04 exhibits two maxima but Ceara Rise data contain only one. The interval between 4.0 and 4.5Ma in the Ceara Rise compilation is decidedly different from LR04, reflecting both the low amplitude of the signal over this interval and the limited amount of data available for the LR04 stack. A regional difference in benthic δ18O of 0.2‰ relative to LR04 was found. Independent tuning of Site 926 images and physical property data to the Laskar et al. (2004) orbital solution and integration of available benthic stable isotope data from the Ceara Rise provides a new regional reference section for the equatorial Atlantic covering the last 5 million years.
| Type: | Article |
|---|---|
| Title: | Revisiting the Ceara Rise, equatorial Atlantic Ocean: isotope stratigraphy of ODP Leg 154 from 0 to 5Ma |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.5194/cp-13-779-2017 |
| Publisher version: | https://doi.org/10.5194/cp-13-779-2017 |
| Language: | English |
| Additional information: | © Author(s) 2017. This work is distributed under the Creative Commons Attribution 3.0 License. |
| Keywords: | Science & Technology, Physical Sciences, Geosciences, Multidisciplinary, Meteorology & Atmospheric Sciences, Geology, Deep-water Circulation, Site 982, Insolation Quantities, Earth, Timescale, Climate, Record, Cores, MYR, MA |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10076962 |
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