DOI: 10.1016/j.gloplacha.2013.04.013
论文题名: Testing the magnetic proxy χFD/HIRM for quantifying paleoprecipitation in modern soil profiles from Shaanxi Province, China
作者: Liu Z. ; Liu Q. ; Torrent J. ; Barrón V. ; Hu P.
刊名: Global and Planetary Change
ISSN: 0921-8229
出版年: 2013
卷: 110 起始页码: 368
结束页码: 378
语种: 英语
英文关键词: Climate transfer function
; Magnetic proxy
; Modern soil
; Paleoprecipitation
Scopus关键词: Magnetic parameters
; Magnetic proxies
; Magnetite , Maghemite
; Mean annual precipitation
; Mean annual temperatures
; Paleoprecipitation
; Production increase
; Reductive dissolution
; Dissolution
; Ferrimagnetism
; Finite difference method
; Hematite
; Magnetite
; Remanence
; Transfer functions
; Soils
; dissolution
; error analysis
; hematite
; iron oxide
; magnetic property
; mineral
; paleoclimate
; paleoenvironment
; paleomagnetism
; precipitation (climatology)
; proxy climate record
; soil profile
; China
; Shaanxi
英文摘要: Soils are natural archives of paleoclimates, especially for paleoprecipitation. Environmental magnetic parameters of soils are of great interest for paleoenvironmental and paleoclimatic investigations. Generally, magnetite, maghemite, hematite, and goethite are the main minerals controlling the magnetic properties of soils. The application of magnetic methods in large areas is, however, limited due to the potential effects of parent material. Here, magnetic measurements were conducted on modern soil profiles along a North-South transect in Shaanxi Province, China, to test a new magnetic proxy, defined as the ratio between the absolute frequency dependent susceptibility and the hard isothermal remanence magnetization (χFD/HIRM) for paleoprecipitation estimation. More specifically, χFD and HIRM were used as semi-quantitative proxies for the ferrimagnets (magnetite and maghemite) and hematite concentrations, respectively. The proxy χFD/HIRM, estimated from the scatter plots of χFD and HIRM ranges between 4.5 and 97.6×10-5mA-1 and systematically increases with the mean annual precipitation (MAP) from 300 to 1000mm (χFD/HIRM=0.124×MAP-31.5, R2=0.92) with an error of ±70mm for the paleoprecipitation estimation, but is less related to mean annual temperature (MAT) (R2=0.29 for a MAT range of 8-15°C). For MAP<1000mm, both pedogenic ferrimagnet and hematite production increases with increasing MAP, which suggests that these minerals are likely to be genetically related. Nevertheless, the concentration of ferrimagnets increased more markedly than that of hematite. For a soil profile located in an area where MAP>1000mm, the χFD/HIRM value was only 17.8×10-5mA-1 as the likely result of reductive dissolution or alteration, the effect being more marked for ferrimagnets than for hematite. In summary, this new paleoclimatic transfer function has potential to predict MAP for Holocene soils with MAP<1000mm, providing that there is no reductive dissolution or alteration of the iron oxides and the effect of other influential factors (e.g. temperature) is taken into account. © 2013 Elsevier B.V. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84888845172&doi=10.1016%2fj.gloplacha.2013.04.013&partnerID=40&md5=491ea1a74b1e91325d816b1935d35782
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/11135
Appears in Collections: 全球变化的国际研究计划
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作者单位: State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
Recommended Citation:
Liu Z.,Liu Q.,Torrent J.,et al. Testing the magnetic proxy χFD/HIRM for quantifying paleoprecipitation in modern soil profiles from Shaanxi Province, China[J]. Global and Planetary Change,2013-01-01,110.