Universität zu Köln

Duesing, Walter, Berner, Nadine ORCID: 0000-0002-1843-2747, Deino, Alan L., Foerster, Verena, Kraemer, K. Hauke, Marwan, Norbert ORCID: 0000-0003-1437-7039 and Trauth, Martin H. (2021). Multiband Wavelet Age Modeling for a similar to 293 m (similar to 600 kyr) Sediment Core From Chew Bahir Basin, Southern Ethiopian Rift. Front. Earth Sci., 9. LAUSANNE: FRONTIERS MEDIA SA. ISSN 2296-6463

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Abstract

The use of cyclostratigraphy to reconstruct the timing of deposition of lacustrine deposits requires sophisticated tuning techniques that can accommodate continuous long-term changes in sedimentation rates. However, most tuning methods use stationary filters that are unable to take into account such long-term variations in accumulation rates. To overcome this problem we present herein a new multiband wavelet age modeling (MUBAWA) technique that is particularly suitable for such situations and demonstrate its use on a 293 m composite core from the Chew Bahir basin, southern Ethiopian rift. In contrast to traditional tuning methods, which use a single, defined bandpass filter, the new method uses an adaptive bandpass filter that adapts to changes in continuous spatial frequency evolution paths in a wavelet power spectrum, within which the wavelength varies considerably along the length of the core due to continuous changes in long-term sedimentation rates. We first applied the MUBAWA technique to a synthetic data set before then using it to establish an age model for the approximately 293 m long composite core from the Chew Bahir basin. For this we used the 2nd principal component of color reflectance values from the sediment, which showed distinct cycles with wavelengths of 10-15 and of similar to 40 m that were probably a result of the influence of orbital cycles. We used six independent 40Ar/39Ar ages from volcanic ash layers within the core to determine an approximate spatial frequency range for the orbital signal. Our results demonstrate that the new wavelet-based age modeling technique can significantly increase the accuracy of tuned age models.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Duesing, Walter UNSPECIFIED UNSPECIFIED UNSPECIFIED Berner, Nadine UNSPECIFIED orcid.org/0000-0002-1843-2747 UNSPECIFIED Deino, Alan L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Foerster, Verena UNSPECIFIED UNSPECIFIED UNSPECIFIED Kraemer, K. Hauke UNSPECIFIED UNSPECIFIED UNSPECIFIED Marwan, Norbert UNSPECIFIED orcid.org/0000-0003-1437-7039 UNSPECIFIED Trauth, Martin H. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-587734
DOI:	10.3389/feart.2021.594047
Journal or Publication Title:	Front. Earth Sci.
Volume:	9
Date:	2021
Publisher:	FRONTIERS MEDIA SA
Place of Publication:	LAUSANNE
ISSN:	2296-6463
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language Geosciences, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/58773