Revised composite depth scales and integration of IODP Sites U1331U1334 and ODP Sites 12181220

Westerhold, Thomas; Röhl, U.; Wilkens, Roy H; Pälike, Heiko; Lyle, M.; Jones, Tom Dunkley; Bown, Paul R.; Moore, T. C.; Kamikuri, Shin-ichi; Acton, Gary D; Ohneiser, Chirstian; Yamamoto, Yuhji; Richter, Carl; Fitch, Peter; Scher, Howie D.; Liebrand, Diederik; Expedition,; Scientists,

doi:10.2204/iodp.proc.320321.201.2012

Cited by 54 publications

(76 citation statements)

References 1 publication

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“…An expanded Oligocene-Miocene section with a well-defined magnetostratigraphy was recovered (Pälike et al, 2010;Channell et al, 2013), and a continuous spliced record of Holes A, B, and C was placed on a core composite depth scale below the sea floor (CCSF-A; equivalent to metres composite depth; Figs. 2 and 3; Westerhold et al, 2012a). Samples were taken along the splice and all results presented here follow this depth model .…”

Section: Site Descriptionmentioning

confidence: 99%

“…The dataset for the Australia-Antarctic pair is similar to that presented by Cande and Stock (2004). It is expanded from that used by Lourens et al (2004), who assigned reversal ages spanning from 18.524 to 23.030 Ma for the chron interval The magnetic susceptibility and CaCO 3 content record (Pälike et al, 2010;Westerhold et al, 2012a). Green area indicates the 2σ uncertainty estimate of the coulometry measurements (Pälike et al, 2010).…”

Section: Reversal Ages Based On Plate-pair Spreading Ratesmentioning

confidence: 99%

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Astronomical tunings of the Oligocene–Miocene transition from Pacific Ocean Site U1334 and implications for the carbon cycle

et al. 2018

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Abstract. Astronomical tuning of sediment sequences requires both unambiguous cycle pattern recognition in climate proxy records and astronomical solutions, as well as independent information about the phase relationship between these two. Here we present two different astronomically tuned age models for the Oligocene-Miocene transition (OMT) from Integrated Ocean Drilling Program Site U1334 (equatorial Pacific Ocean) to assess the effect tuning has on astronomically calibrated ages and the geologic timescale. These alternative age models (roughly from ∼ 22 to ∼ 24 Ma) are based on different tunings between proxy records and eccentricity: the first age model is based on an aligning CaCO 3 weight (wt%) to Earth's orbital eccentricity, and the second age model is based on a direct age calibration of benthic foraminiferal stable carbon isotope ratios (δ 13 C) to eccentricity. To independently test which tuned age model and associated tuning assumptions are in best agreement with independent ages based on tectonic plate-pair spreading rates, we assign the tuned ages to magnetostratigraphic reversals identified in deep-marine magnetic anomaly profiles. Subsequently, we compute tectonic plate-pair spreading rates based on the tuned ages. The resultant alternative spreading-rate histories indicate that the CaCO 3 tuned age model is most consistent with a conservative assumption of constant, or linearly changing, spreading rates. The CaCO 3 tuned age model thus provides robust ages and durations for polarity chrons C6Bn.1n-C7n.1r, which are not based on astronomical tuning in the latest iteration of the geologic timescale. Furthermore, it provides independent evidence that the relatively large (several 10 000 years) time lags documented in the benthic foraminiferal isotope records relative to orbital eccentricity constitute a real feature of the OligoceneMiocene climate system and carbon cycle. The age constraints from Site U1334 thus indicate that the delayed responses of the Oligocene-Miocene climate-cryosphere system and (marine) carbon cycle resulted from highly nonlinear feedbacks to astronomical forcing.

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Section: Site Descriptionmentioning

confidence: 99%

Section: Reversal Ages Based On Plate-pair Spreading Ratesmentioning

confidence: 99%

Astronomical tunings of the Oligocene–Miocene transition from Pacific Ocean Site U1334 and implications for the carbon cycle

et al. 2018

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“…All depths reported here for the PEAT Sites U1334, U1336, U1337 and U1338 are in revised metres composite depth (rmcd) (Westerhold et al, 2012;Wilkens et al, 2013) and for Site U1335 depth is given in metres composite depth (mcd) (Pälike et al, 2010). The sedimentary sequences represent a continuous Cenozoic record of the equatorial Pacific recovered along an age transect where different sites were located within a 2°band north and south of the equator for different time intervals (Pälike et al, 2010).…”

Section: Site Descriptionmentioning

confidence: 99%

Variability of carbonate diagenesis in equatorial Pacific sediments deduced from radiogenic and stable Sr isotopes

Voigt

Hathorne

Frank

et al. 2015

Geochimica et Cosmochimica Acta

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“…IODP Site U1334 samples Nannofossils analysed in this study were extracted from the latest Eocene to earliest Oligocene ($34.9 to 33.4 Ma) sediments of IODP Site U1334, eastern equatorial Pacific. Fourteen samples were taken from the primary splice, between 292.73 m and 303.34 m CCSF-A (Westerhold et al, 2012). Here, the Eocene/Oligocene Transition (E/ OT) is clearly identified by the shift from uppermost Eocene, low-carbonate ($20%) radiolarian ooze to lower Oligocene carbonate-rich ($80%) nannofossil ooze (Pälike et al, 2009).…”

Section: Sample Materials and Preparationmentioning

confidence: 99%

Trace metal (Mg/Ca and Sr/Ca) analyses of single coccoliths by Secondary Ion Mass Spectrometry

Prentice¹,

Jones²,

Lees³

et al. 2014

Geochimica et Cosmochimica Acta

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Revised composite depth scales and integration of IODP Sites U1331U1334 and ODP Sites 12181220

Cited by 54 publications

References 1 publication

Astronomical tunings of the Oligocene–Miocene transition from Pacific Ocean Site U1334 and implications for the carbon cycle

Astronomical tunings of the Oligocene–Miocene transition from Pacific Ocean Site U1334 and implications for the carbon cycle

Variability of carbonate diagenesis in equatorial Pacific sediments deduced from radiogenic and stable Sr isotopes

Trace metal (Mg/Ca and Sr/Ca) analyses of single coccoliths by Secondary Ion Mass Spectrometry

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Revised composite depth scales and integration of IODP Sites U1331U1334 and ODP Sites 12181220

Cited by 54 publications

References 1 publication

Astronomical tunings of the Oligocene–Miocene transition from Pacific Ocean Site U1334 and implications for the carbon cycle

Astronomical tunings of the Oligocene–Miocene transition from Pacific Ocean Site U1334 and implications for the carbon cycle

Variability of carbonate diagenesis in equatorial Pacific sediments deduced from radiogenic and stable Sr isotopes

Trace metal (Mg/Ca and Sr/Ca) analyses of single coccoliths by Secondary Ion Mass Spectrometry

Contact Info

Product

Resources

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Revised composite depth scales and integration of IODP Sites U1331U1334 and ODP Sites 12181220