Drury, AJ;
Kulhanek, DK;
Westerhold, T;
Ravelo, AC;
Mountain, G;
Holbourn, A;
Rosenthal, Y;
... Röhl, U; + view all
(2021)
Data report: composite depth scale and splice revision for IODP Site U1488 (Expedition 363 Western Pacific Warm Pool) using XRF core scanning data and core images.
Proceedings of the International Ocean Discovery Program
, 363
10.14379/iodp.proc.363.205.2021.
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Abstract
The Western Pacific Warm Pool (WPWP) is a major source of heat and moisture to the atmosphere. Small perturbations in WPWP sea-surface temperatures greatly influence local Hadley and Walker cells, thereby affecting global atmospheric circulation patterns. International Ocean Discovery Program (IODP) Expedition 363 sought to document the regional expression and driving mechanisms of WPWP climate variability during the Neogene on millennial, orbital, and geological timescales. Located in the heart of the WPWP, IODP Site U1488 (02°02.59ʹN, 141°45.29ʹE) was drilled in 2604 m water depth on the southern part of the Eauripik Rise in the Caroline Basin. At Site U1488, a continuous shipboard composite stratigraphic section from 0 to ~331 m core composite depth below seafloor (CCSF) was compiled using high-resolution shipboard physical property data from three holes. This section comprises upper Miocene to recent foraminifer-rich nannofossil ooze and foraminifer-nannofossil ooze, making Site U1488 ideally suited to reconstruct the paleoceanographic history of the central WPWP region. However, the high carbonate content (>90% below ~180 m CCSF) of Site U1488 sediments means that the physical property data sets commonly used for splice construction (gamma ray attenuation bulk density, magnetic susceptibility, and natural gamma radiation) were too low amplitude to provide robust constraints on splice tie points below 120 m CCSF. As a result, P-wave data, which are relatively untested as a correlation tool, became critical for correlating between holes. Here, we verify and extend the Site U1488 shipboard composite splice using high-resolution (2 cm) X-ray fluorescence Ba/Sr core scanning data combined with composite linescan images. Overall, using these data at Site U1488 resulted in revised core offsets that differ by up to 0.84 m relative to the shipboard core offsets and a composite depth scale down to 329.33 m revised CCSF. The revised splice will allow optimization of postexpedition research and ensure that high-resolution studies of Site U1488 are conducted on a continuous stratigraphic section.
| Type: | Article |
|---|---|
| Title: | Data report: composite depth scale and splice revision for IODP Site U1488 (Expedition 363 Western Pacific Warm Pool) using XRF core scanning data and core images |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.14379/iodp.proc.363.205.2021 |
| Publisher version: | https://doi.org/10.14379/iodp.proc.363.205.2021 |
| Language: | English |
| Additional information: | © The Authors 2021. This work is distributed under the Creative Commons Attribution 4.0 International (CC BY 4.0) license (https://creativecommons.org/licenses/by/4.0/). This research used samples and data provided by IODP, which is sponsored by the US National Science Foundation and participating countries. A.J. Drury and the XRF core scanning were funded by a MARUM Incentive Fund Award to A.J. Drury. A.J. Drury was additionally funded by DFG (Project Number 408101468) and by European Union’s Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie Action grant agreement No 796220 (MIONIÑO). D. Kulhanek was funded by IODP JRSO NSF grant Number 1326927. Published online on 29/10/2021 |
| 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-pp.ucl.ac.uk/id/eprint/10138593 |
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