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Hodell, David A; Lourens, Lucas Joost; Crowhurst, Simon J; Konijnendijk, Theodoor Yuri Martij; Tjallingii, Rik; Jiménez-Espejo, Francisco Jose; Skinner, Luke C; Tzedakis, Polychronis C (2015): Chronostratigraphy and stable isotopes of IODP Site 339-U1385 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.872083, Supplement to: Hodell, DA et al. (2015): A reference time scale for Site U1385 (Shackleton Site) on the SW Iberian Margin. Global and Planetary Change, 133, 49-64, https://doi.org/10.1016/j.gloplacha.2015.07.002

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Abstract:
We produced a composite depth scale and chronology for Site U1385 on the SW Iberian Margin. Using log(Ca/Ti) measured by core scanning XRF at 1-cm resolution in all holes, a composite section was constructed to 166.5 meter composite depth (mcd) that corrects for stretching and squeezing in each core. Oxygen isotopes of benthic foraminifera were correlated to a stacked d18O reference signal (LR04) to produce an oxygen isotope stratigraphy and age model.
Variations in sediment color contain very strong precession signals at Site U1385, and the amplitude modulation of these cycles provides a powerful tool for developing an orbitally-tuned age model. We tuned the U1385 record by correlating peaks in L* to the local summer insolation maxima at 37°N. The benthic d18O record of Site U1385, when placed on the tuned age model, generally agrees with other time scales within their respective chronologic uncertainties.
The age model is transferred to down-core data to produce a continuous time series of log(Ca/Ti) that reflect relative changes of biogenic carbonate and detrital sediment. Biogenic carbonate increases during interglacial and interstadial climate states and decreases during glacial and stadial periods. Much of the variance in the log(Ca/Ti) is explained by a linear combination of orbital frequencies (precession, tilt and eccentricity), whereas the residual signal reflects suborbital climate variability. The strong correlation between suborbital log(Ca/Ti) variability and Greenland temperature over the last glacial cycle at Site U1385 suggests that this signal can be used as a proxy for millennial-scale climate variability over the past 1.5 Ma.
Millennial climate variability, as expressed by log(Ca/Ti) at Site U1385, was a persistent feature of glacial climates over the past 1.5 Ma, including glacial periods of the early Pleistocene ('41-kyr world') when boundary conditions differed significantly from those of the late Pleistocene ('100-kyr world'). Suborbital variability was suppressed during interglacial stages and enhanced during glacial periods, especially when benthic d18O surpassed ~ 3.3?3.5?. Each glacial inception was marked by appearance of strong millennial variability and each deglaciation was preceded by a terminal stadial event. Suborbital variability may be a symptomatic feature of glacial climate or, alternatively, may play a more active role in the inception and/or termination of glacial cycles.
Related to:
Hodell, David A (2016): Chronostratigraphy and stable isotopes of Site U1385 (Shackleton site) on the Iberian Margin over the past 1.5 Ma. NOAA National Centers for Environmental Information, https://doi.org/10.25921/EK7W-V171
Project(s):
Integrated Ocean Drilling Program / International Ocean Discovery Program (IODP)
Coverage:
Median Latitude: 37.571410 * Median Longitude: -10.126035 * South-bound Latitude: 37.571307 * West-bound Longitude: -10.126180 * North-bound Latitude: 37.571490 * East-bound Longitude: -10.125932
Date/Time Start: 2011-11-25T00:00:00 * Date/Time End: 2011-11-25T00:00:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
14 datasets

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Datasets listed in this publication series

  1. Hodell, DA; Lourens, LJ; Crowhurst, SJ et al. (2015): (Table S3) Radiocarbon ages of IODP Site 339-U1385. https://doi.org/10.1594/PANGAEA.872068
  2. Hodell, DA; Lourens, LJ; Crowhurst, SJ et al. (2015): (Table S4) Greenland synthetic age mode for IODP Site 339-U1385. https://doi.org/10.1594/PANGAEA.872069
  3. Hodell, DA; Lourens, LJ; Crowhurst, SJ et al. (2015): (Table S7) Mediterranean cyclostratigraphic tuned time scale IODP Site 339-U1385. https://doi.org/10.1594/PANGAEA.872072
  4. Hodell, DA; Lourens, LJ; Crowhurst, SJ et al. (2015): (Table S5) Oxgyen isotope time scale for IODP Site 339-U1385. https://doi.org/10.1594/PANGAEA.872070
  5. Hodell, DA; Lourens, LJ; Crowhurst, SJ et al. (2015): (Table S6) Tuned age model for IODP Site 339-U1385. https://doi.org/10.1594/PANGAEA.872071
  6. Hodell, DA; Lourens, LJ; Crowhurst, SJ et al. (2015): Calcium/Titanium ratios of IODP Site 339-U1385. https://doi.org/10.1594/PANGAEA.872080
  7. Hodell, DA; Lourens, LJ; Crowhurst, SJ et al. (2015): Color reflectance of IODP Site 339-U1385. https://doi.org/10.1594/PANGAEA.872081
  8. Hodell, DA; Lourens, LJ; Crowhurst, SJ et al. (2015): (Table S1) Shipboard composite and corrected composite depths of IODP Site 339-U1385. https://doi.org/10.1594/PANGAEA.872066
  9. Hodell, DA; Lourens, LJ; Crowhurst, SJ et al. (2015): Stable oxygen isotopic record of foraminifera from IODP Site 339-U1385. https://doi.org/10.1594/PANGAEA.872082
  10. Hodell, DA; Lourens, LJ; Crowhurst, SJ et al. (2015): (Table S2) Splice tie points for IODP Site 339-U1385. https://doi.org/10.1594/PANGAEA.872067
  11. Hodell, DA; Lourens, LJ; Crowhurst, SJ et al. (2015): Calcium/Titanium ratios of IODP Hole 339-U1385A. https://doi.org/10.1594/PANGAEA.872076
  12. Hodell, DA; Lourens, LJ; Crowhurst, SJ et al. (2015): Calcium/Titanium ratios of IODP Hole 339-U1385B. https://doi.org/10.1594/PANGAEA.872077
  13. Hodell, DA; Lourens, LJ; Crowhurst, SJ et al. (2015): Calcium/Titanium ratios of IODP Hole 339-U1385D. https://doi.org/10.1594/PANGAEA.872078
  14. Hodell, DA; Lourens, LJ; Crowhurst, SJ et al. (2015): Calcium/Titanium ratios of IODP Hole 339-U1385E. https://doi.org/10.1594/PANGAEA.872079