globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2017.07.007
论文题名:
Assessing the utility of visible-to-shortwave infrared reflectance spectroscopy for analysis of soil weathering intensity and paleoclimate reconstruction
作者: Zhao L.; Hong H.; Liu J.; Fang Q.; Yao Y.; Tan W.; Yin K.; Wang C.; Chen M.; Algeo T.J.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2017
语种: 英语
英文关键词: CIA ; Clay minerals ; Fe-oxide minerals ; Imaging spectroscopy ; Paleoclimate ; VSWIR
英文摘要: Visible-to-shortwave infrared reflectance (VSWIR) spectroscopy is a fast and efficient approach for estimation of soil properties. In order to test whether soil weathering intensity can be predicted using reflectance spectra in the VSWIR range (350-2500nm), and to examine the efficacy of this methodology to supplement or substitute for traditional mineralogical and geochemical techniques of paleoclimate reconstruction, we investigated a Quaternary soil sequence at Shengli in the Sichuan Basin of southwestern China. VSWIR absorption bands can be characterized by geometrical parameters including position (P), depth (D), width (W), asymmetry (AS), and full width at half maximum (F). Our results indicate that spectral features in the visible-to-near-infrared (VNIR; 350-1000nm) range can be interpreted in terms of the presence and/or concentration of individual Fe-oxide phases. Spectrally detected water is mostly bound in clay minerals, and this single dominant water source facilitates interpretation of shortwave infrared (SWIR; 1000-2500nm) parameters. Soil spectral parameters were compared with the Fe-oxide mineralogy, major element composition, and clay mineralogy of soil samples obtained from conventional laboratory analyses. Strong correlations are found between VNIR parameters and Fe-oxide mineralogy, with D900 serving as the best proxy for total ferric iron concentration. P900 and D700/D500 exhibit similar variation trends and relationships to the hematite/(hematite+goethite) [H/(H+G)] ratio of soil samples, confirming their value as monsoonal weathering intensity proxies. Lower values of P900 and D700/D500 indicate warmer and seasonally drier pedoenvironments, reflecting a stronger East Asian summer monsoon. The utility of some SWIR parameters for assessment of weathering intensity declines in inhomogeneous soils (e.g., those having vermiform structure). Thus, spectral evaluation of weathering intensity is most effective in soils that are relatively homogeneous, for which weathering degree is highly correlated to AS2200, D2200/D1900, and AS1400. The utility of these spectral proxies depends mainly on the mineral composition of soils and the application type (i.e., laboratory versus field studies). The application of VSWIR in the field (e.g., imaging spectroscopy, or IS) shows promise for rapid, in-situ mapping of weathering intensity, thus providing a convenient approach to paleoclimate reconstruction in remote and inaccessible regions. © 2017 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68145
Appears in Collections:过去全球变化的重建

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作者单位: School of Earth Sciences, China University of Geosciences, Wuhan 430074, China; Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China; Department of Geology, Northeastern University, Shenyang, Liaoning 110004, China; Gemological Institute, China University of Geosciences, Wuhan 430074, China; Hubei Geological Survey, Wuhan 430034, China; State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China; Department of Geology, University of Cincinnati, Cincinnati, OH 45221-0013, USA

Recommended Citation:
Zhao L.,Hong H.,Liu J.,et al. Assessing the utility of visible-to-shortwave infrared reflectance spectroscopy for analysis of soil weathering intensity and paleoclimate reconstruction[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2017-01-01
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