A 640 kyr geomagnetic and palaeoclimatic record from Lake Baikal sediments
Magnetic remanence vectors for 1737 samples from two ∼100 m cores of Lake Baikal sediments are reported along with complete magnetic susceptibility profiles obtained from a pass-through system. Chronological control is established by means of two independent correlations; first, by matching suscepti...
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ftunivrhodeislan:oai:digitalcommons.uri.edu:gsofacpubs-2676 2024-01-21T10:07:24+01:00 A 640 kyr geomagnetic and palaeoclimatic record from Lake Baikal sediments Kravchinsky, Vadim A. Evans, Michael E. Peck, John A. Sakai, Hideo Krainov, Mikhail A. King, John W. Kuzmin, Mikhail I. 2007-07-01T07:00:00Z https://digitalcommons.uri.edu/gsofacpubs/1707 https://doi.org/10.1111/j.1365-246X.2007.03411.x unknown DigitalCommons@URI https://digitalcommons.uri.edu/gsofacpubs/1707 doi:10.1111/j.1365-246X.2007.03411.x https://doi.org/10.1111/j.1365-246X.2007.03411.x Graduate School of Oceanography Faculty Publications Geomagnetic excursions Lake Baikal Magnetic susceptibility Milankovitch cycles Palaeoclimate Siberia text 2007 ftunivrhodeislan https://doi.org/10.1111/j.1365-246X.2007.03411.x 2023-12-25T19:09:53Z Magnetic remanence vectors for 1737 samples from two ∼100 m cores of Lake Baikal sediments are reported along with complete magnetic susceptibility profiles obtained from a pass-through system. Chronological control is established by means of two independent correlations; first, by matching susceptibility variations to the oceanic oxygen isotope record and second, by matching the relative palaeointensity variations to the SINT-800 global reference curve. These both imply an average deposition rate of 15 cm kyr-1 and a basal age of ∼640 ka. Spectral analysis reveals the presence of Milankovitch signals at ∼100 kyr (eccentricity), ∼41 kyr (obliquity) and ∼23 and ∼19 kyr (precession). Stable remanence vectors are almost all of normal polarity. The few exceptions comprise brief intervals of low and/or negative inclinations which probably represent geomagnetic excursions. However, these are far less numerous than the high sedimentation rate would lead one to expect. Furthermore, only four of them can be readily matched to the-still poorly understood-global pattern. These are the Laschamp, the Albuquerque, the Iceland Basin and perhaps the West Eifel excursions which occurred at ∼38 000, ∼146 000, at 180 000-190 000 and at 480 000-495 000 yr ago, respectively. © 2007 The Authors Journal compilation © 2007 RAS. Text Iceland Siberia University of Rhode Island: DigitalCommons@URI Geophysical Journal International 170 1 101 116 |
institution |
Open Polar |
collection |
University of Rhode Island: DigitalCommons@URI |
op_collection_id |
ftunivrhodeislan |
language |
unknown |
topic |
Geomagnetic excursions Lake Baikal Magnetic susceptibility Milankovitch cycles Palaeoclimate Siberia |
spellingShingle |
Geomagnetic excursions Lake Baikal Magnetic susceptibility Milankovitch cycles Palaeoclimate Siberia Kravchinsky, Vadim A. Evans, Michael E. Peck, John A. Sakai, Hideo Krainov, Mikhail A. King, John W. Kuzmin, Mikhail I. A 640 kyr geomagnetic and palaeoclimatic record from Lake Baikal sediments |
topic_facet |
Geomagnetic excursions Lake Baikal Magnetic susceptibility Milankovitch cycles Palaeoclimate Siberia |
description |
Magnetic remanence vectors for 1737 samples from two ∼100 m cores of Lake Baikal sediments are reported along with complete magnetic susceptibility profiles obtained from a pass-through system. Chronological control is established by means of two independent correlations; first, by matching susceptibility variations to the oceanic oxygen isotope record and second, by matching the relative palaeointensity variations to the SINT-800 global reference curve. These both imply an average deposition rate of 15 cm kyr-1 and a basal age of ∼640 ka. Spectral analysis reveals the presence of Milankovitch signals at ∼100 kyr (eccentricity), ∼41 kyr (obliquity) and ∼23 and ∼19 kyr (precession). Stable remanence vectors are almost all of normal polarity. The few exceptions comprise brief intervals of low and/or negative inclinations which probably represent geomagnetic excursions. However, these are far less numerous than the high sedimentation rate would lead one to expect. Furthermore, only four of them can be readily matched to the-still poorly understood-global pattern. These are the Laschamp, the Albuquerque, the Iceland Basin and perhaps the West Eifel excursions which occurred at ∼38 000, ∼146 000, at 180 000-190 000 and at 480 000-495 000 yr ago, respectively. © 2007 The Authors Journal compilation © 2007 RAS. |
format |
Text |
author |
Kravchinsky, Vadim A. Evans, Michael E. Peck, John A. Sakai, Hideo Krainov, Mikhail A. King, John W. Kuzmin, Mikhail I. |
author_facet |
Kravchinsky, Vadim A. Evans, Michael E. Peck, John A. Sakai, Hideo Krainov, Mikhail A. King, John W. Kuzmin, Mikhail I. |
author_sort |
Kravchinsky, Vadim A. |
title |
A 640 kyr geomagnetic and palaeoclimatic record from Lake Baikal sediments |
title_short |
A 640 kyr geomagnetic and palaeoclimatic record from Lake Baikal sediments |
title_full |
A 640 kyr geomagnetic and palaeoclimatic record from Lake Baikal sediments |
title_fullStr |
A 640 kyr geomagnetic and palaeoclimatic record from Lake Baikal sediments |
title_full_unstemmed |
A 640 kyr geomagnetic and palaeoclimatic record from Lake Baikal sediments |
title_sort |
640 kyr geomagnetic and palaeoclimatic record from lake baikal sediments |
publisher |
DigitalCommons@URI |
publishDate |
2007 |
url |
https://digitalcommons.uri.edu/gsofacpubs/1707 https://doi.org/10.1111/j.1365-246X.2007.03411.x |
genre |
Iceland Siberia |
genre_facet |
Iceland Siberia |
op_source |
Graduate School of Oceanography Faculty Publications |
op_relation |
https://digitalcommons.uri.edu/gsofacpubs/1707 doi:10.1111/j.1365-246X.2007.03411.x https://doi.org/10.1111/j.1365-246X.2007.03411.x |
op_doi |
https://doi.org/10.1111/j.1365-246X.2007.03411.x |
container_title |
Geophysical Journal International |
container_volume |
170 |
container_issue |
1 |
container_start_page |
101 |
op_container_end_page |
116 |
_version_ |
1788697972851081216 |