Universität zu Köln

Baumgarten, H., Wonik, T., Tanner, D. C., Francke, A., Wagner, B., Zanchetta, G., Sulpizio, R., Giaccio, B. and Nomade, S. (2015). Age-depth model of the past 630 kyr for Lake Ohrid (FYROM/Albania) based on cyclostratigraphic analysis of downhole gamma ray data. Biogeosciences, 12 (24). S. 7453 - 7466. GOTTINGEN: COPERNICUS GESELLSCHAFT MBH. ISSN 1726-4189

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Abstract

Gamma ray (GR) fluctuations and potassium (K) values from downhole logging data obtained in the sediments of Lake Ohrid from 0 to 240 m below lake floor (b.l.f). correlate with fluctuations in delta O-18 values from the global benthic isotope stack LR04 (Lisiecki and Raymo, 2005). GR and K values are considered a reliable proxy to depict glacial-interglacial cycles, with high clastic input during cold and/or drier periods and high carbonate precipitation during warm and/or humid periods at Lake Ohrid. Spectral analysis was applied to investigate the climate signal and evolution over the length of the borehole. Linking downhole logging data with orbital cycles was used to estimate sedimentation rates and the effect of compaction was compensated for. Sedimentation rates increase on average by 14 % after decompaction of the sediment layers and the mean sedimentation rates shift from 45 cm kyr(-1) between 0 and 110 m to 30 cm kyr(-1) from 110 to 240 m b.l.f. Tuning of minima and maxima of gamma ray and potassium values versus LR04 extrema, in combination with eight independent tephrostratigraphical tie points, allows establishing of a robust age model for the downhole logging data over the past 630 kyr.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Baumgarten, H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wonik, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Tanner, D. C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Francke, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wagner, B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Zanchetta, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sulpizio, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Giaccio, B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Nomade, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-415336
DOI:	10.5194/bg-12-7453-2015
Journal or Publication Title:	Biogeosciences
Volume:	12
Number:	24
Page Range:	S. 7453 - 7466
Date:	2015
Publisher:	COPERNICUS GESELLSCHAFT MBH
Place of Publication:	GOTTINGEN
ISSN:	1726-4189
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language PHYSICAL-PROPERTIES; RECORD; VARIABILITY; CLIMATE; BASIN; CHRONOSTRATIGRAPHY; SEDIMENTS; PLEISTOCENE; EVOLUTION; POROSITY Multiple languages Ecology; Geosciences, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/41533