Leg 154 synthesis

Curry, W.B.; Shackleton, N.J.; Richter, C.

doi:10.2973/odp.proc.ir.154.109.1995

Cited by 14 publications

(1 citation statement)

References 23 publications

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“…Here, we test the existing tuning results through the application of our correlation algorithm. The second example is a colour reflectance record from ODP Leg 154, Site 926 in the equatorial Atlantic (Curry et al, 1995;Shackleton and Crowhurst, 1997;Zeeden et al, 2013). The colour reflectance variability has been interpreted to represent input of terrestrial material from the Amazon into the equatorial Atlantic (Harris et al, 1997;Dobson et al, 2001), and ODP Leg 154 shows a rather clear imprint of astronomical climate forcing, which was used in numerous studies ( Shackleton and Crowhurst, 1997;Shackleton et al, 1999;Pälike et al, 2006a;Wilkens et al, 2017).…”

Section: Adjustment Of Correlative Age Modelsmentioning

confidence: 99%

Taner filter settings and automatic correlation optimisation for cyclostratigraphic studies

Zeeden

Kaboth

Hilgen

et al. 2018

Computers & Geosciences

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Cyclostratigraphy and astronomical tuning utilize the imprint of quasi-cyclic insolation changes in geological records to establish chronologies. In this context, filtering of time series in specific frequency bands is commonly applied to extract information on astronomical forcing from geological datasets. This approach is performed on specific insolation components (precession, obliquity or eccentricity) and sometimes also their amplitudes either in depth or time domain. In this study, we design and apply a simulation technique to determine the optimal Taner filter settings to extract precession-, obliquity-and eccentricity-related interference signals from astronomically tuned geological datasets. This is done by testing a variety of filter settings on several astronomical and artificial datasets. Based on our results, we propose specific filter designs (cut-off frequencies and roll-off rates) for the best extraction of astronomical (interference) signals from tuned geological datasets. Focus here lies on datasets shorter than ca. 1 million years and interference patterns between astronomical components. A second step utilizes these filter settings for an automated alignment, where geological data on a tuned time scale are matched to a suite of astrochronologic correlation targets. This is done by aligning filter minima and maxima to astronomical targets. This approach is particularly useful for the determination of the relative contributions of astronomical parameters in a specific dataset and allows for the automatic determination of phase shifts between well expressed insolation components in datasets.

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Section: Adjustment Of Correlative Age Modelsmentioning

confidence: 99%

Taner filter settings and automatic correlation optimisation for cyclostratigraphic studies

Zeeden

Kaboth

Hilgen

et al. 2018

Computers & Geosciences

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The role of calcareous nannofossils in building age models for Cenozoic marine sediments: a review

Raffi

Backman

2022

Rend. Fis. Acc. Lincei

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This review paper has been thought to emphasize the role of Biostratigraphy in Geosciences and, specifically, of calcareous nannofossils as dating tool. This group of calcareous plankton occurs in Mesozoic and Cenozoic carbonate-bearing marine sediments in all depositional settings and is routinely used for stratigraphic purposes. The importance of calcareous nannofossils in relative dating of marine sediments is due to their abundance, taxonomic diversity, rapid evolution and wide distribution in marine environments. Nannofossil biostratigraphy improved over the last few decades due to the use of accurate methods for data gathering, including acquisition of semiquantitative census data on high-resolution samples. These microfossils contribute to obtain reliable biostratigraphic classification in various time-intervals in the last 66 m.y. and often provide the key to the interpretation of other stratigraphic records. Nannofossil biohorizons can be used as control points for constructing cyclostratigraphic composite sections, and for identification of magnetostratigraphic intervals, and have provided a basis for age models subsequently developed into orbitally tuned cyclostratigraphies or used for chronological revision of polarity timescale. Graphic abstract

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1.10 Tectonism, Climate, and Geomorphology

Orme

2013

Treatise on Geomorphology

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Leg 154 synthesis

Cited by 14 publications

References 23 publications

Taner filter settings and automatic correlation optimisation for cyclostratigraphic studies

Taner filter settings and automatic correlation optimisation for cyclostratigraphic studies

The role of calcareous nannofossils in building age models for Cenozoic marine sediments: a review

1.10 Tectonism, Climate, and Geomorphology

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