noaa-ocean-10313
Chukchi Sea Holocene Rock Magnetic Data
Brachfeld, S.; Barletta, F.; St-Onge, G.; Darby, D.; Ortiz, J.D.
Chukchi Sea Holocene Rock Magnetic Data
2010-12-31
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/10313
Investigator
S.
Brachfeld
Investigator
F.
Barletta
Investigator
G.
St-Onge
Investigator
D.
Darby
Investigator
J.D.
Ortiz
earth science
paleoclimate
paleoceanography
saturation magnetization,sediment,null,ampere square meter per kilogram,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
saturation remanent magnetization/saturation magnetization,sediment,null,dimensionless,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
anhysteretic remanent magnetization/isothermal remanent magnetization,sediment,null,dimensionless,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
depth,null,null,centimeter,null,paleoceanography,corrected,null,N,null
earth science
paleoclimate
paleoceanography
magnetic susceptibility,sediment,null,cubic meter per kilogram,null,paleoceanography,null,null,N,low field X
earth science
paleoclimate
paleoceanography
median destructive field,sediment,null,millitesla,null,paleoceanography,null,null,N,median destructive field of ARM
earth science
paleoclimate
paleoceanography
saturation isothermal remanent magnetization,sediment,null,ampere per meter,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
magnetic susceptibility,sediment,null,cubic meter per kilogram,null,paleoceanography,null,null,N,high field X
earth science
paleoclimate
paleoceanography
coercivity of remanence,sediment,null,millitesla,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
S-ratio,sediment,null,dimensionless,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
anhysteretic remanent magnetization,sediment,null,millitesla,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
saturation isothermal remanent magnetization/magnetic susceptibility,sediment,null,dimensionless,null,paleoceanography,null,null,N,low field X
earth science
paleoclimate
paleoceanography
coercivity,sediment,null,millitesla,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
coercivity of remanence/coercivity,sediment,null,dimensionless,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
median destructive field,sediment,null,millitesla,null,paleoceanography,null,null,N,median destructive field of natural remanent magnetization
earth science
paleoclimate
paleoceanography
depth,null,null,centimeter,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
saturation remanent magnetization,sediment,null,ampere square meter per kilogram,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
magnetic susceptibility,sediment,null,cubic meter per kilogram,null,paleoceanography,null,null,N,ferromagnetic X
earth science
paleoclimate
paleocean
physical properties
earth science
paleoclimate
paleocean
magnetic susceptibility
geoscientificInformation
Arctic
sea ice
9330 cal yr BP
1350 cal yr BP
Complete
72.694
72.694
-157.52
-157.52
-415
-415
Ocean
Arctic Ocean
Chukchi Sea
HLY05-01 JPC5>LATITUDE 72.694>LONGITUDE -157.52
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
Brachfeld, S., F. Barletta, G. St-Onge, D. Darby, and J. Ortiz. 2009.
Impact of diagenesis on the environmental magnetic record from
a Holocene sedimentary sequence from the Chukchi-Alaskan margin,
Arctic Ocean.
Global and Planetary Change, Vol. 68, pp. 100-114.
doi:10.1016/j.gloplacha.2009.03.023
We present a high-resolution Holocene sedimentary record
of environmental variability from the eastern Chukchi Sea.
An ice-rafted debris bearing silty-clay marks the deglacial
to post-glacial Holocene transition at this site and is dated
at 9.7 ka. An interval of oscillating magnetic parameters from
9.5 to 8.7 ka coincides with the Holocene Thermal Maximum in
the western Arctic, and is manifested at the study area as pulses
of fine-grained magnetite input every 180-230 years, possibly
from increased river discharge or stronger currents flowing
over the core site. The magnetic mineral assemblage is very
uniform over the last 8.2 ka and consists of a mixture of magnetite,
titanomagnetite, and a magnetic phase that we tentatively identify
as the magnetic iron sulfide greigite. The amount of magnetic
iron sulfides increases up through the Holocene, a trend that
is controlled by the amount of marine organic matter available
to fuel bacterial sulfate reduction. The median destructive
field of the Natural Remanent Magnetization (MDFNRM) displays
centennial to millennial scale cycles with significant variance
at periods of 900–1300 and 1700–2700 years, with intervals of
high MDFNRM values coinciding with indicators of greater sea ice
cover [McKay, J., de Vernal, A., Hillaire-Marcel, C., Not, C.,
Polyak, L., Darby, D., 2008. Holocene fluctuations in Arctic
sea-ice cover: Dinocyst-based reconstructions for the eastern
Chukchi Sea. Can. J. Earth Sci. 45, 1399–1415]. The MDFNRM
is controlled by the variable abundance of iron sulfides formed
during early diagenesis. We interpret intervals of high MDFNRM
values as times of stronger water column stratification, during
which the pyritization process was interrupted by the lack of
marine organic matter and lack of reactive iron. Intervals of
low MDFNRM values, which coincide with indicators of reduced
sea ice cover, are interpreted as times of stronger vertical
mixing of the water column, which allows fresh marine organic
matter and reactive iron to reach the seafloor, driving the
pyritization process to completion.
STUDY NOTES: The dataset consists of rock magnetic parameters,
which are sensitive to sea ice cover, paleoproductivity,
and post depositional diagenesis along the Chukchi-Alaska
margin. Piston Core HLY05-01 JPC5 and its trigger core TC5
were collected from the eastern Chukchi Sea, North of Barrow,
Alaska during cruise 05–01 of the USCGC Healy. The parameters
include low-field magnetic susceptibility (X-LH),
coercivity (Hc), saturation remanence (Mr), saturation
magnetization (Ms), saturation remanence normalized by
saturation magnetization (Mr/Ms), high-field magnetic
susceptibility (Xhf), ferromagnetic susceptibility (Xf),
coercivity of remanence (Hcr), coercivity of remanence
normalized by coercivity (Hcr/Hc), S-ratio, saturation
remanence normalized by low-field susceptibility (Mr/X),
median destruction field of the natural remanent
magnetization (MDF-NRM), anhysteretic remanent
magnetization (ARM), median destructive field of the
anhysteretic remanent magnetization (ARM-MDF),
saturation isothermal remanent magnetization (SIRM),
and anhysteretic remanent magnetization normalized
by saturation isothermal remanent magnetization (ARM/SIRM).
The parameters MDF-NRM, ARM, MDF-ARM, and SIRM were measured
on U-channel subsamples on 2G-Enterprises Model 760R u-channel
magnetometer at the University of Florida, Gainesville, FL.
Low-field mass-normalized magnetic susceptibility (XLF)
of dry samples was measured on an AGICO KLY-4 Kappabridge
in an applied field of 300 A/m. Ferromagnetic susceptibility (XF)
was calculated by subtracting the high-field slope (XHF)
of the magnetization (M) vs. applied field (H) curve
measured on a vibrating sample magnetometer from XLF.
Magnetic hysteresis measurements were made on a Princeton
Measurements Corp. micro-Vibrating Sample Magnetometer
model 3900-04 at Montclair State University, NJ.
Hysteresis loops were measured in a peak field of 1 T
and field increments of 5 mT. Raw data were processed
by using XHF, calculated from 0.7 to 1 T, to remove the
paramagnetic contribution to the induced magnetization,
and then normalized by dry mass. The hysteresis parameters
saturation magnetization (Ms), saturation remanence (Mr)
and coercivity (Hc) were determined from the paramagnetic-
corrected data. The coercivity of remanence (Hcr) was
determined through the DC-demagnetization of a saturation
isothermal remanent magnetization imparted in a 1 T field.
The S-ratio was measured by imparting a 1 T isothermal
remanent magnetization, followed by the application of
a 300 mT backfield, and calculating Mr(300mT)/MR(1T).
A combination of 210Pb dating and Accelerator Mass Spectrometer (AMS)
radiocarbon dating of calcareous shells was used to construct the
depth-age model for TC5 and JPC5.
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/brachfeld2009/brachfeld2009.txt
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/brachfeld2009/brachfeld2009.xls
USA/NOAA
DIF
Version 9.8.4
2018-12-11
2018-12-11