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...
Main Authors: | , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Berlin
2015
|
Subjects: | |
Online Access: | https://oa.tib.eu/renate/handle/123456789/8823 https://doi.org/10.34657/7861 |
id |
fttibhannoverren:oai:oa.tib.eu:123456789/8823 |
---|---|
record_format |
openpolar |
spelling |
fttibhannoverren:oai:oa.tib.eu:123456789/8823 2023-07-30T04:03:54+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 ESSN:1437-3262 DOI:https://doi.org/10.1007/s00531-014-1082-x https://oa.tib.eu/renate/handle/123456789/8823 https://doi.org/10.34657/7861 CC BY 4.0 Unported https://creativecommons.org/licenses/by/4.0/ frei zugänglich International journal of earth sciences 104 (2015), Nr. 6 Cyclostratigraphy Downhole logging Lake sediments Paleoclimate Quaternary Sedimentation rates ddc:550 status-type:publishedVersion doc-type:article doc-type:Text 2015 fttibhannoverren https://doi.org/10.34657/786110.1007/s00531-014-1082-x 2023-07-10T16:19:39Z 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. Article in Journal/Newspaper Greenland North Greenland Renate - Repositorium für Naturwissenschaften und Technik (TIB Hannover) Greenland |
institution |
Open Polar |
collection |
Renate - Repositorium für Naturwissenschaften und Technik (TIB Hannover) |
op_collection_id |
fttibhannoverren |
language |
English |
topic |
Cyclostratigraphy Downhole logging Lake sediments Paleoclimate Quaternary Sedimentation rates ddc:550 |
spellingShingle |
Cyclostratigraphy Downhole logging Lake sediments Paleoclimate Quaternary Sedimentation rates ddc: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 ddc: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. |
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_relation |
ESSN:1437-3262 DOI:https://doi.org/10.1007/s00531-014-1082-x https://oa.tib.eu/renate/handle/123456789/8823 https://doi.org/10.34657/7861 |
op_rights |
CC BY 4.0 Unported https://creativecommons.org/licenses/by/4.0/ frei zugänglich |
op_doi |
https://doi.org/10.34657/786110.1007/s00531-014-1082-x |
_version_ |
1772815033461374976 |