Chronostratigraphy and stable isotopes of Site U1385 (Shackleton site) on the Iberian Margin over the past 1.5 Ma Hodell, D.A. Hodell, D.A. earth science/paleoclimate/paleoceanography (notes,null,null,null,null,paleoceanography,null,null,C,site hole) earth science/paleoclimate/paleoceanography (depth,null,null,meter,null,paleoceanography,composited,null,N,null) earth science/paleoclimate/paleoceanography (age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,based on correlating oxygen isotope record to the reference stack of Lisiecki and Raymo (2005)) earth science/paleoclimate/paleoceanography (notes,null,null,null,null,paleoceanography,null,null,N,top offset in section) earth science/paleoclimate/paleoceanography (depth at sample end,null,null,meter,null,paleoceanography,composited,null,N,revised composited) earth science/paleoclimate/paleoceanography (age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,based on the previously published Mediteranean-tuned age model of Hodell et al. 2015) earth science/paleoclimate/paleoceanography (delta 18O,Globigerina bulloides,null,per mil PDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (notes,null,null,null,null,paleoceanography,null,null,C,site code) earth science/paleoclimate/paleoceanography (depth at sample end,null,null,meter,null,paleoceanography,null,null,N,below surface) earth science/paleoclimate/paleoceanography (delta 18O,Cibicidoides wuellerstorfi,null,per mil PDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 13C,Globigerina bulloides,null,per mil PDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (depth,null,null,meter,null,paleoceanography,composited,null,N,for splice) earth science/paleoclimate/paleoceanography (notes,null,null,null,null,paleoceanography,null,null,N,composite offset in study) earth science/paleoclimate/paleoceanography (delta 13C,Cibicidoides wuellerstorfi,null,per mil PDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (notes,null,null,null,null,paleoceanography,null,null,C,core type) earth science/paleoclimate/paleoceanography (depth at sample end,null,null,meter,null,paleoceanography,composited,null,N,null) earth science/paleoclimate/paleoceanography (notes,null,null,null,null,paleoceanography,null,null,N,composite offset; difference shipboard to study) earth science/paleoclimate/paleoceanography (age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,based on correlation of Site U1385 to Cores MD01-2444 and -2443 (Hodell et al.) earth science/paleoclimate/paleoceanography (notes,null,null,null,null,paleoceanography,null,null,C,core section) earth science/paleoclimate/paleoceanography (depth,null,null,meter,null,paleoceanography,composited,null,N,revised composited; for splice) earth science/paleoclimate/paleoceanography (notes,null,null,null,null,paleoceanography,null,null,C,splice note) earth science/paleoclimate/paleoceanography (notes,null,null,null,null,paleoceanography,null,null,N,bottom offset in section) earth science/paleoclimate/paleoceanography (depth at sample start,null,null,centimeter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (lightness,sediment,null,dimensionless,null,paleoceanography,null,null,N,CIELAB lightness) earth science/paleoclimate/paleoceanography (notes,null,null,null,null,paleoceanography,null,null,C,core ID) earth science/paleoclimate/paleoceanography (depth,null,null,meter,null,paleoceanography,composited,null,N,revised composited) earth science/paleoclimate/paleoceanography (depth,null,null,meter,null,paleoceanography,composited|corrected,null,N,null) earth science/paleoclimate/paleoceanography (sedimentation rate,null,null,centimeter per kiloyear,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (calcium/titanium,sediment,null,dimensionless,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (notes,null,null,null,null,paleoceanography,null,null,N,composite offset shipboard) earth science/paleoclimate/paleoceanography (age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,based on correlating the log(Ca/Ti) to carbonate record of MD99-2334 (Skinner et al.) earth science/paleoclimate/paleoceanography (notes,null,null,null,null,paleoceanography,null,null,C,expedition ID) earth science/paleoclimate/paleoceanography (depth,null,null,meter,null,paleoceanography,null,null,N,below surface) earth science/paleoclimate/paleoceanography (age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,based on tuning sediment lightness L* to orbital precession) earth science/paleoclimate/paleoceanography (depth at sample end,null,null,meter,null,paleoceanography,composited|corrected,null,N,null) earth science/paleoclimate/paleoceanography (depth at sample end,null,null,centimeter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean (IODP U1385>LATITUDE 37.571417>LONGITUDE -10.126033) 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. STUDY NOTES: Carbon isotope data to be added when published. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Hodell, D.A. 2016-02-08 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/19782 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2015/hodell2015-u1385-affine.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2015/hodell2015-u1385-isotopes.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2015/hodell2015-u1385-radio.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2015/hodell2015-u1385b.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2015/hodell2015-u1385-tuned.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2015/hodell2015-u1385a.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2015/hodell2015-u1385-cati-spl.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2015/hodell2015-u1385-splice.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2015/hodell2015-u1385-med.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2015/hodell2015-u1385d.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2015/hodell2015-u1385-light.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2015/hodell2015-u1385e.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2015/hodell2015-u1385-greensyn.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2015/hodell2015-u1385-lr04.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2015/hodell2015-u1385-affine.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2015/hodell2015-u1385-isotopes.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2015/hodell2015-u1385-radio.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2015/hodell2015-u1385b.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2015/hodell2015-u1385-tuned.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2015/hodell2015-u1385a.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2015/hodell2015-u1385-cati-spl.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2015/hodell2015-u1385-splice.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2015/hodell2015-u1385-med.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2015/hodell2015-u1385d.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2015/hodell2015-u1385-light.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2015/hodell2015-u1385e.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2015/hodell2015-u1385-greensyn.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2015/hodell2015-u1385-lr04.txt English https://www.ncdc.noaa.gov/paleo/study/19782 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2015/hodell2015-u1385-affine.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2015/hodell2015-u1385-isotopes.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2015/hodell2015-u1385-radio.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2015/hodell2015-u1385b.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2015/hodell2015-u1385-tuned.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2015/hodell2015-u1385a.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2015/hodell2015-u1385-cati-spl.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2015/hodell2015-u1385-splice.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2015/hodell2015-u1385-med.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2015/hodell2015-u1385d.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2015/hodell2015-u1385-light.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2015/hodell2015-u1385e.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2015/hodell2015-u1385-greensyn.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2015/hodell2015-u1385-lr04.txt Hodell, D., L. Lourens, S. Crowhurst, T. Konijnendijk, R. Tjallingii, F. Jiménez-Espejo, L. Skinner, P.C. Tzedakis, and Shackleton Site Project Members2015A reference time scale for Site U1385 (Shackleton Site) on the SW Iberian MarginGlobal and Planetary Change13349-6410.1016/j.gloplacha.2015.07.002 START YEAR: 1450000 cal yr BP * END YEAR: 0 cal yr BP -10.126033 37.571417 -10.126033 37.571417