noaa-ocean-10514
Arctic Alaskan Margin Holocene Geomagnetic Data
Lisé-Pronovost, A.; St-Onge, G.; Brachfeld, S.; Barletta, F.; Darby, D.
Arctic Alaskan Margin Holocene Geomagnetic Data
2011-01-29
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/10514
Investigator
A.
Lisé-Pronovost
Investigator
G.
St-Onge
Investigator
S.
Brachfeld
Investigator
F.
Barletta
Investigator
D.
Darby
earth science
paleoclimate
paleocean
magnetic susceptibility
geoscientificInformation
sea ice
8637 cal yr BP
136 cal yr BP
Complete
71.63
72.69
-157.03
-156.86
-673
-90
Ocean
Arctic Ocean
Beaufort Sea
HLY05-01 JPC6>LATITUDE 72.69>LONGITUDE -157.03
Ocean
Arctic Ocean
Beaufort Sea
HLY05-01 JPC8>LATITUDE 71.63>LONGITUDE -156.86
None
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English
DOC/NOAA/NESDIS/NCEI
National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
https://www.ncdc.noaa.gov/data-access/paleoclimatology-data
DATA Center Contact
Bruce
Bauer
bruce.a.bauer@noaa.gov
paleo@noaa.gov
303-497-6280
303-497-6513
325 Broadway, E/NE31
Boulder
CO
80305-3328
USA
online
ASCII
Lisé-Pronovost, A., G. St-Onge, S. Brachfeld, F. Barletta,
and D. Darby. 2009.
Paleomagnetic constraints on the Holocene stratigraphy
of the Arctic Alaskan margin.
Global and Planetary Change, Vol. 68, Issues 1-2, pp. 85-99,
July 2009. doi:10.1016/j.gloplacha.2009.03.015
Two long Holocene piston cores (HLY0501-06JPC and -08JPC;
herein after referred to as 6JPC and 8JPC) were raised from
high sediment accumulation areas in the Arctic Alaskan margin
in order to reconstruct the millennial- to centennial-scale
behavior of Earth's magnetic field and to better constrain
the regional chronostratigraphy of the Western Arctic.
Paleomagnetic analyses using a u-channel cryogenic magnetometer
(natural, anhysteretic and isothermal remanent magnetizations:
NRM, ARM and IRM) and a vibrating sample magnetometer indicate
that a strong and stable single component characteristic remanent
magnetization carried by low coercivity pseudo-single domain (PSD)
grains such as magnetite can be isolated in the postglacial unit
of both cores, where the inclination values vary around the
geocentric axial dipole (GAD) for the latitude of the coring
sites and where the maximum angular deviation (MAD) values are
generally lower than 5°. Apart from one interval in each core,
all the derived relative paleointensity proxies (NRM/kLF, NRM/ARM
and NRM/IRM) yield similar results. NRM/IRM was used as the
preferred proxy because, based on cross-spectral analysis,
it is not coherent with its normalizer. Based on the comparison
with paleomagnetic records from Western North America,
the paleomagnetic and physical analyses indicate that both
sedimentary sequences have recorded some of the first reliable
Arctic high-resolution records of paleomagnetic secular variation
(inclination and declination) and relative paleointensity during
the Holocene. In addition, full vector paleomagnetic correlations
(inclination, declination and relative paleointensity) were used
to constrain the chronology of core 6JPC, using core 8JPC and
other previously published and independently dated sedimentary
and volcanic records from Western North America. The Accelerator
Mass Spectroscopy (AMS) radiocarbon-based postglacial chronology
of core 8JPC indicates sedimentation rates higher than 300 cm/kyr
on the continental shelf near Barrow Canyon from approximately
8000 to 5000 cal BP, followed by a major decrease in sediment
deposition. In contrast, the postglacial deposition on the slope
at core site 6JPC is relatively constant and sedimentation rates
are nearly three times lower.
STUDY NOTES: The dataset consists of paleomagnetic and rock magnetic parameters
from Holocene sediment cores from the western Alaska margin.
The paleomagnetic data are used as one component of a Holocene
age model for the Chukchi Sea. The rock magnetic parameters are
sensitive to sea ice cover, paleoproductivity, and post depositional
diagenesis in the Chukchi-Alaska margin. The parameters include
natural remanent magnetization (NRM), geomagnetic inclination
and declination determined from principal component analysis,
anhysteretic remanent magnetization (ARM), isothermal remanent
magnetization, magnetic susceptibility, wet bulk density, S-ratio,
median destruction field of the natural remanent magnetization
(MDF-NRM), and ratios constructed from these parameters.
Magnetic susceptibility and bulk density were measured on a
Geotek multisensor track. NRM, ARM, IRM, and SIRM were measured
on a 2G model 755 cyrogenic magnetometer at the Institut des
Sciences de la Mer (ISMER) at the Université du Québec at
Rimouski, Canada.
Cores HLY05-01 JPC6 and HLY05-01 JPC8 were collected during
cruise 05-01 of the U.S. Coast Guard Cutter Healy (Healy-Oden
Trans-Arctic Expedition "HOTRAX" Leg 1).
Correlation of physical properties datasets between the
jumbo piston core (JPC6) and its companion trigger core (TC)
was used to determine the amount of section lost at the top
of the piston core. Lisé-Pronovst et al., 2009 favor a 80cm
adjustment of the JPC depth scale. Ortiz et al., 2009 favor
a 147cm adjustment. Both adjustments and resulting age models
are presented here.
Correlation of physical properties datasets between the
jumbo piston core (JPC8) and its companion trigger core (TC)
was used to determine the amount of section lost at the top
of the piston core. The depth adjustment is 51 cm.
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lise-pronovost2009/lise-pronovost2009.xls
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lise-pronovost2009/lise-pronovost2009.txt
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2018-12-11
2018-12-11