A stacked record of relative geomagnetic paleointensity for the past 270 kyr from the western continental rise of the Antarctic Peninsula
Author(s)
Language
English
Status
Published
Peer review journal
Yes
Issue/vol(year)
252 (2006)
Pages (printed)
162–179
Date Issued
2006
Abstract
Paleomagnetic and rock magnetic investigations were carried out on four gravity cores recovered from the western continental rise
of the Antarctic Peninsula during the SEDANO II cruise of RV OGS-Explora. The studied cores, each about 6.5 m-long, were
collected at a depth of 3700–4100 m below the sea level, on the distal gentle side of sediment Drift 7, and consist of very fine-grained
sediments spanning through various glacial–interglacial cycles. Detailed analysis of the paleomagnetic and rock magnetic data
allowed to reconstruct relative paleointensity (RPI) records (NRM20 mT/ARM20 mT) for each core.We established a refined age model
for the studied sequences by correlating individual SEDANO RPI curves to the global RPI stack SINT-800 [Y. Guyodo, J.-P. Valet,
Global changes in intensity of the Earth's magnetic field during the past 800 kyr, Nature 399 (1999) 249–252]. The individual
normalized SEDANO RPI records are in mutual close agreement; they were thus merged in a RPI stacking curve spanning the last
270 kyr and showing a low standard deviation. This study also points out that RPI records may provide a viable tool to date otherwise
difficult-to-date sedimentary sequences, such as those deposited along peri-Antarctic margins. The new RPI chronology indicates that
the sampled sedimentary sequence is younger than previously thought and allows a new high-resolution correlation to oxygen isotope
stages. Furthermore, we recognized variations in the rock magnetic parameters that appear to be climatically-driven, with changes in
the relative proportion of two magnetic mineral populations with distinct coercivities. Rock magnetic and lithological trends observed
in the SEDANO cores indicate that during the climatic cycles of the Late Pleistocene this sector of the peri-Antarctic margin was
subjected to subtle, yet identifiable, environmental changes, confirming a relatively higher instability of theWest Antarctic ice sheet
with respect to the East Antarctic counterpart.
of the Antarctic Peninsula during the SEDANO II cruise of RV OGS-Explora. The studied cores, each about 6.5 m-long, were
collected at a depth of 3700–4100 m below the sea level, on the distal gentle side of sediment Drift 7, and consist of very fine-grained
sediments spanning through various glacial–interglacial cycles. Detailed analysis of the paleomagnetic and rock magnetic data
allowed to reconstruct relative paleointensity (RPI) records (NRM20 mT/ARM20 mT) for each core.We established a refined age model
for the studied sequences by correlating individual SEDANO RPI curves to the global RPI stack SINT-800 [Y. Guyodo, J.-P. Valet,
Global changes in intensity of the Earth's magnetic field during the past 800 kyr, Nature 399 (1999) 249–252]. The individual
normalized SEDANO RPI records are in mutual close agreement; they were thus merged in a RPI stacking curve spanning the last
270 kyr and showing a low standard deviation. This study also points out that RPI records may provide a viable tool to date otherwise
difficult-to-date sedimentary sequences, such as those deposited along peri-Antarctic margins. The new RPI chronology indicates that
the sampled sedimentary sequence is younger than previously thought and allows a new high-resolution correlation to oxygen isotope
stages. Furthermore, we recognized variations in the rock magnetic parameters that appear to be climatically-driven, with changes in
the relative proportion of two magnetic mineral populations with distinct coercivities. Rock magnetic and lithological trends observed
in the SEDANO cores indicate that during the climatic cycles of the Late Pleistocene this sector of the peri-Antarctic margin was
subjected to subtle, yet identifiable, environmental changes, confirming a relatively higher instability of theWest Antarctic ice sheet
with respect to the East Antarctic counterpart.
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[10] J.E.T. Channell, D.A. Hodell, B. Lehman, Relative geomagnetic
paleointensity and δ18O at ODP Site 983 (Gardar Drift, North
Atlantic) since 350 ka, Earth Planet. Sci. Lett. 153 (1997) 103–118.
[11] J.E.T. Channell, J.S. Stoner, D.A. Hodell, C.D. Charles,
Geomagnetic paleointensity for the last 100 kyr from the sub- antarctic South Atlantic: a tool for inter-hemispheric correlation,
Earth Planet. Sci. Lett. 175 (2000) 145–160.
[12] J.E.T. Channell, Geomagnetic paleointensity and directional
secular variation at Ocean Drilling Program (ODP) site 984
(Bjorn Drift) since 500 ka: comparisons with ODP site 983
(Gardar drift), J. Geophys. Res. 104 (1999) 22937–22951.
[13] N. Thouveny, J. Carcaillet, E. Moreno, G. Leduc, D. Nerini,
Geomagnetic moment variation and paleomagnetic excursions
since 400 kyr BP: a stacked record from sedimentary sequences
of the Portuguese margin, Earth Planet. Sci. Lett. 219 (2004)
377–396.
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intensity from sedimentary records: the past 200.000 years, Earth
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duration of the Laschamp event, Philos. Trans. R. Soc. Lond.
A-358 (2000) 1009–1025.
[17] J.S. Stoner, C. Laj, J.E.T. Channell, C. Kissel, South Atlantic
(SAPIS) and North Atlantic (NAPIS) geomagnetic paleointensity
stacks (0–80 ka): implications for inter-hemispheric correlation,
Quat. Sci. Rev. 21 (2002) 1141–1151.
[18] C. Laj, C. Kissel, J. Beer, High resolution global paleointensity
stack since 75 kyr (GLOPIS-75) calibrated to absolute values,
Timescales of the Paleomagnetic field, AGU Geophysical
Monograph Series, vol. 145, 2004, pp. 255–265.
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