noaa-loess-9702
Ili Basin, China 80KYr Loess Magnetic Data
Song, Y.G.; Shi, Z.T.; Fang, X.M.; Nie, J.S.; Ishikawa, N.; Qiang, X.K.; Wang, X.L.
Ili Basin, China 80KYr Loess Magnetic Data
2010-10-27
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/9702
Investigator
Y.G.
Song
Investigator
Z.T.
Shi
Investigator
X.M.
Fang
Investigator
J.S.
Nie
Investigator
N.
Ishikawa
Investigator
X.K.
Qiang
Investigator
X.L.
Wang
earth science
paleoclimate
loess
mass magnetic susceptibility,loess,null,cubic meter per kilogram,null,loess,null,null,N,Chaona; High frequency mass magnetic susceptibility; units 10E-7 m3 kg-2
earth science
paleoclimate
loess
mass magnetic susceptibility,loess,null,cubic meter per kilogram,null,loess,null,null,N,Chaona; Absolute frequency mass magnetic susceptibility; units 10E-7 m3 kg-3
earth science
paleoclimate
loess
age,null,null,calendar kiloyear before present,null,loess,null,null,N,Chaona
earth science
paleoclimate
loess
mass magnetic susceptibility,loess,null,percent,null,loess,null,null,N,Zhaosu; percent frequency dependent mass magnetic susceptibility
earth science
paleoclimate
loess
mass magnetic susceptibility,loess,null,cubic meter per kilogram,null,loess,null,null,N,Zhaosu; Absolute frequency mass magnetic susceptibility; units 10E-7 m3 kg-3
earth science
paleoclimate
loess
depth,null,null,meter,null,loess,null,null,N,Chaona
earth science
paleoclimate
loess
mass magnetic susceptibility,loess,null,cubic meter per kilogram,null,loess,null,null,N,Zhaosu; High frequency mass magnetic susceptibility; units 10E-7 m3 kg-2
earth science
paleoclimate
loess
anhysteretic remanent magnetization,loess,null,cubic meter per kilogram,null,loess,null,null,N,Chaona; normalized ARM with units 10^-6
earth science
paleoclimate
loess
mass magnetic susceptibility,loess,null,cubic meter per kilogram,null,loess,null,null,N,Chaona; Low frequency mass magnetic susceptibility; units 10E-7 m3 kg-1
earth science
paleoclimate
loess
age,null,null,calendar kiloyear before present,null,loess,null,null,N,Zhaosu
earth science
paleoclimate
loess
anhysteretic remanent magnetization,loess,null,cubic meter per kilogram,null,loess,null,null,N,Zhaosu; normalized ARM with units 10^-6
earth science
paleoclimate
loess
depth,null,null,meter,null,loess,null,null,N,Zhaosu
earth science
paleoclimate
loess
mass magnetic susceptibility,loess,null,cubic meter per kilogram,null,loess,null,null,N,Zhaosu; Low frequency mass magnetic susceptibility; units 10E-7 m3 kg-1
earth science
paleoclimate
loess
mass magnetic susceptibility,loess,null,percent,null,loess,null,null,N,Chaona; percent frequency dependent mass magnetic susceptibility
earth science
paleoclimate
loess
geoscientificInformation
Monsoon
millennial resolution
141250 cal yr BP
0 cal yr BP
Complete
35.1
35.1
107.2
107.2
1452
1452
Continent
Asia
Eastern Asia
China
Chaona section>LATITUDE 35.1>LONGITUDE 107.2
None
Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site.
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
Song, Y.G., Z.T. Shi, X.M. Fang, J.S. Nie, N. Ishikawa,
X.K. Qiang, and X.L. Wang. 2010.
Loess magnetic properties in the Ili Basin and their
correlation with the Chinese Loess Plateau.
China Science: Earth Sciences, Vol. 53(3), pp. 419-431.
DOI: 10.1007/s11430-010-0011-5
Over the past two decades, magnetoclimatological studies of
loess-paleosol sequences in the Chinese Loess Plateau (CLP)
have made outstanding achievements, which greatly promote
the understanding of East Asian paleomonsoon evolution,
inland aridification of Asia, and past global climate changes.
Loess magnetic properties of the CLP have been well studied.
In contrast, loess magnetic properties from outside the CLP
in China have not been fully understood. We have little
knowledge about the magnetic properties of loess in the
Ili Basin, an intermontane depression of the Tianshan
(or Tien Shan) Mountains. Here, we present the results
of rock magnetic measurements of the Ili loess including
mass magnetic susceptibility (?) and anhysteretic remanent
magnetization (ARM), high/low temperature dependence of
susceptibility (TDS) and hysteresis, as well as X-ray
diffraction (XRD) for mineral analysis. Based on the
comparison with loess-paleosol sequences in the CLP
(hereafter referred to as the Chinese loess), we discuss
the possible magnetic susceptibility enhancement mechanism
of the Ili loess. The results show that 1) the total magnetic
mineral concentration of the Ili loess is far lower than that
of the Chinese loess, though they have similar magnetic mineral
compositions. The ferrimagnetic minerals in the Ili loess are
magnetite and maghemite, and the antiferromagnetic mineral
is hematite; XRD analysis also identifies the presence of
ilmenite. The ratio of maghemite is lower in the Ili loess
than in the Chinese loess, but the ratios of magnetite and
hematite are higher in the Ili loess than in the Chinese loess.
2) The granularity of magnetic minerals in the Ili loess,
dominated by pseudo-single domain (PSD) and multi-domain (MD)
grains, is generally much coarser than that of the Chinese loess.
Ultrafine pedogenically-produced magnetic grains have a very
limited contribution to the susceptibility enhancement.
Rather, PSD and MD particles of magnetite and maghemite are
the main contributors to the enhancement of susceptibility
in the Ili loess. 3) The susceptibility enhancement mechanism
for the Ili loess is complicated and superimposes both a wind
velocity/vigor model (Alaskan or Siberian model) and the in situ
ultrafine grain pedogenic model; the former might play an
important role in the Ili loess. 4) Magnetic susceptibility
enhancements of the Ili loess are related not only to the
eolian input of the source area, but also to the local climate,
landform, and geological background. Therefore, great care
should be taken when reconstructing paleoclimate using magnetic
susceptibility data from the Ili loess.
STUDY NOTES: Magnetic susceptibility data of two loess-paleosol sequences
since the last interglaciation, from Central Asia and the
Chinese Loess Plateau. One section from Zhaosu, Ili Basin,
is located in western Zhaosu county near the boundary between
China and Kazakhstan. The Zhaosu loess section (ZSP) is 6.9m
thick from the top to the upper part the first paleosol (S1),
and the bottom consists of fluvial gravel sediments.
According to IRSL (infrared stimulated luminescence) dating
of this section, the bottom is 80,000 years old. The other
loess section is located at the central Chinese Loess Plateau,
named Chaona section (CN). The Chaona section is about 10.4m
in thickness with a 141ka tuning age.
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/loess/china/song2010ili.xls
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/loess/china/song2010ili.txt
USA/NOAA
DIF
Version 9.8.4
2018-12-11
2018-12-11