Cyclostratigraphic studies of sediments from Lake Van (Turkey) based on their uranium contents obtained from downhole logging and paleoclimatic implications

A deep drilling campaign was performed at Lake Van (Turkey) to enhance the understanding of the paleoenvironmental conditions of the Middle East. Cores were collected, and the sediments are mainly composed of clayey silts and tephra deposits. Spectral gamma ray data were acquired (0–210 m below lake...

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Main Authors: Baumgarten, H., Wonik, T.
Format: Article in Journal/Newspaper
Language:English
Published: Berlin 2015
Subjects:
550
Online Access:https://oa.tib.eu/renate/handle/123456789/8823
https://doi.org/10.34657/7861
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spelling ftleibnizopen:oai:oai.leibnizopen.de:tv0oF4cBdbrxVwz6rz0E 2023-05-15T16:29:54+02:00 Cyclostratigraphic studies of sediments from Lake Van (Turkey) based on their uranium contents obtained from downhole logging and paleoclimatic implications Baumgarten, H. Wonik, T. 2015 application/pdf https://oa.tib.eu/renate/handle/123456789/8823 https://doi.org/10.34657/7861 eng eng Berlin Heidelberg : Springer CC BY 4.0 Unported https://creativecommons.org/licenses/by/4.0/ International journal of earth sciences 104 (2015), Nr. 6 Cyclostratigraphy Downhole logging Lake sediments Paleoclimate Quaternary Sedimentation rates 550 article Text 2015 ftleibnizopen https://doi.org/10.34657/7861 2023-03-26T23:16:44Z A deep drilling campaign was performed at Lake Van (Turkey) to enhance the understanding of the paleoenvironmental conditions of the Middle East. Cores were collected, and the sediments are mainly composed of clayey silts and tephra deposits. Spectral gamma ray data were acquired (0–210 m below lake floor), and the uranium data were used for cyclostratigraphic studies to estimate the sedimentation rates and the time of deposition. Detection and analysis of climate cycles require continuous sedimentation and cannot be applied to these sediments which include numerous tephra layers. Therefore, these layers were removed, and a synthetic log was created (cumulative thickness of the tephra ≈50 m; remaining lacustrine sediments ≈160 m). High amplitudes were detected and correlated to Milanković cycles. Their evolution was analyzed using the sliding window technique. The sedimentation rates varied from 22 to 33 cm/ka in the upper section. The sediments between the lake floor and a depth of 210 m were deposited over a period of 587 ka. Our results agree with core interpretations (e.g., correlation of total organic carbon with marine isotope stages) which suggest a time span of deposition of 600 ka. High-frequency cycles were detected and correlated with interstadials from the North Greenland δ18O record for the past 75 ka. The two datasets agreed closely. We conclude that climate signals, even on sub-Milanković scale, are imprinted in uranium of these sediments, and cyclostratigraphic methods are applicable if event layers are subtracted from the sediment record. publishedVersion Article in Journal/Newspaper Greenland North Greenland LeibnizOpen (The Leibniz Association) Greenland
institution Open Polar
collection LeibnizOpen (The Leibniz Association)
op_collection_id ftleibnizopen
language English
topic Cyclostratigraphy
Downhole logging
Lake sediments
Paleoclimate
Quaternary
Sedimentation rates
550
spellingShingle Cyclostratigraphy
Downhole logging
Lake sediments
Paleoclimate
Quaternary
Sedimentation rates
550
Baumgarten, H.
Wonik, T.
Cyclostratigraphic studies of sediments from Lake Van (Turkey) based on their uranium contents obtained from downhole logging and paleoclimatic implications
topic_facet Cyclostratigraphy
Downhole logging
Lake sediments
Paleoclimate
Quaternary
Sedimentation rates
550
description A deep drilling campaign was performed at Lake Van (Turkey) to enhance the understanding of the paleoenvironmental conditions of the Middle East. Cores were collected, and the sediments are mainly composed of clayey silts and tephra deposits. Spectral gamma ray data were acquired (0–210 m below lake floor), and the uranium data were used for cyclostratigraphic studies to estimate the sedimentation rates and the time of deposition. Detection and analysis of climate cycles require continuous sedimentation and cannot be applied to these sediments which include numerous tephra layers. Therefore, these layers were removed, and a synthetic log was created (cumulative thickness of the tephra ≈50 m; remaining lacustrine sediments ≈160 m). High amplitudes were detected and correlated to Milanković cycles. Their evolution was analyzed using the sliding window technique. The sedimentation rates varied from 22 to 33 cm/ka in the upper section. The sediments between the lake floor and a depth of 210 m were deposited over a period of 587 ka. Our results agree with core interpretations (e.g., correlation of total organic carbon with marine isotope stages) which suggest a time span of deposition of 600 ka. High-frequency cycles were detected and correlated with interstadials from the North Greenland δ18O record for the past 75 ka. The two datasets agreed closely. We conclude that climate signals, even on sub-Milanković scale, are imprinted in uranium of these sediments, and cyclostratigraphic methods are applicable if event layers are subtracted from the sediment record. publishedVersion
format Article in Journal/Newspaper
author Baumgarten, H.
Wonik, T.
author_facet Baumgarten, H.
Wonik, T.
author_sort Baumgarten, H.
title Cyclostratigraphic studies of sediments from Lake Van (Turkey) based on their uranium contents obtained from downhole logging and paleoclimatic implications
title_short Cyclostratigraphic studies of sediments from Lake Van (Turkey) based on their uranium contents obtained from downhole logging and paleoclimatic implications
title_full Cyclostratigraphic studies of sediments from Lake Van (Turkey) based on their uranium contents obtained from downhole logging and paleoclimatic implications
title_fullStr Cyclostratigraphic studies of sediments from Lake Van (Turkey) based on their uranium contents obtained from downhole logging and paleoclimatic implications
title_full_unstemmed Cyclostratigraphic studies of sediments from Lake Van (Turkey) based on their uranium contents obtained from downhole logging and paleoclimatic implications
title_sort cyclostratigraphic studies of sediments from lake van (turkey) based on their uranium contents obtained from downhole logging and paleoclimatic implications
publisher Berlin
publishDate 2015
url https://oa.tib.eu/renate/handle/123456789/8823
https://doi.org/10.34657/7861
geographic Greenland
geographic_facet Greenland
genre Greenland
North Greenland
genre_facet Greenland
North Greenland
op_source International journal of earth sciences 104 (2015), Nr. 6
op_rights CC BY 4.0 Unported
https://creativecommons.org/licenses/by/4.0/
op_doi https://doi.org/10.34657/7861
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