Benthic and planktic oxygen and carbon isotopes, alkenone, pollen, and XRF data at IODP 339-U1385 for MIS 34-35 and MIS 42-43 southern Portuguese Margin ...

We report analyses of marine and terrestrial proxies from IODP Site 339-U1385 on the southern Portuguese Margin. We focus on two time-windows, representing distinct climatic contexts: one from the Early Pleistocene interval of 41-kyr glacial cycles (1335-1385 ka) and one from the Early–Middle Pleist...

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Bibliographic Details
Main Authors: Margari, Vasiliki, Hodell, David A, Grimalt, Joan O, Tzedakis, Polychronis C
Format: Article in Journal/Newspaper
Language:English
Published: PANGAEA 2023
Subjects:
Alkenones
Benthic and planktonic foraminifera
IODP 339-U1385
Oxygen and carbon stable isotopes
Pollen
XRF core scanner data
Integrated Ocean Drilling Program / International Ocean Discovery Program IODP
Planktonic foraminifera
Online Access:https://dx.doi.org/10.1594/pangaea.961070
https://doi.pangaea.de/10.1594/PANGAEA.961070
Description
Summary:We report analyses of marine and terrestrial proxies from IODP Site 339-U1385 on the southern Portuguese Margin. We focus on two time-windows, representing distinct climatic contexts: one from the Early Pleistocene interval of 41-kyr glacial cycles (1335-1385 ka) and one from the Early–Middle Pleistocene Transition (~1110-1200 ka). Analyses were undertaken with respect to (i) oxygen isotopic composition of planktic and benthic foraminifera, reflecting changes in surface-water conditions, and global ice-volume and deep-water hydrography, respectively; (ii) the relative composition of C37 unsaturated alkenones, reflecting surface-water conditions; (iii) pollen content, providing an integrated picture of regional vegetation changes in southwestern Portugal; and (iv) X-ray fluorescence (XRF) sediment composition changes, reflecting variations in the relative proportion of detrital (Zr) and biogenic (Sr) sediment supply. ...

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