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Study of the Modified Gaussian Model on olivine diagnostic spectral features and its applications in space weathering experiments
Alternative TitleWOS:000563437100001
Han, Hui-Jie; Lu, Xiao-Ping; Yang, Ya-Zhou; Zhang, Hao2,3; Mutelo, Admire Muchimamui4
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
2020
Volume20Issue:8Pages:129
DOI10.1088/1674-4527/20/8/129
ISSN1674-4527
Language英语
Keywordtechniques spectroscopic instrumentation spectrographs methods statistical minor planets asteroids general REFLECTANCE SPECTRA ASTEROIDS PYROXENE ABSORPTION METEORITE MINERALS IRON DIFFERENTIATION IDENTIFICATION DECONVOLUTION
AbstractThe absorption features of olivine in visible and near-infrared (VNIR) reflectance spectra are the key spectral parameters in its mineralogical studies. Generally, these spectral parameters can be obtained by exploiting the Modified Gaussian Model (MGM) with a proper continuum removal. However, different continua may change the deconvolution results of these parameters. This paper investigates the diagnostic spectral features of olivine with diverse chemical compositions. Four different continuum removal methods with MGM for getting the deconvolution results are presented and the regression equations for predicting the Mg-number (Fo#) are introduced. The results show that different continua superimposed on the mineral absorption features will make the absorption center shift, as well as the obvious alterations in shape, width and strength of the absorption band. Additionally, it is also found that the logarithm of a second-order polynomial continuum can match the overall shape of the spectrum in logarithmic space, and the improved regression equations applied to estimate the chemical composition of olivine-dominated spectra also have a better performance. As an application example, the improved approach is applied to pulse laser irradiated olivine grains to simulate and study the space weathering effects on olivine diagnostic spectral features. The experiments confirm that space weathering can make the absorption band center shift toward longer wavelength. Therefore, the Fo# estimated from remote sensing spectra may be less than its actual chemical composition. These results may provide valuable information for revealing the difference between the spectra of olivine grains and olivine-dominated asteroids.
Indexed BySCI
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Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/7631
Collection中国科学院国家空间科学中心
Affiliation1.Macau Univ Sci & Technol, State Key Lab Lunar & Planetary Sci, Taipa 999078, Macao, Peoples R China
2.Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing 100190, Peoples R China
3.China Univ Geosci, Sch Earth Sci, Planetary Sci Inst, Wuhan 430074, Peoples R China
4.CAS Ctr Excellence Comparat Planctol, Hefei 230026, Peoples R China
5.China Univ Geosci, Sch Earth Sci & Resources, Beijing 100083, Peoples R China
Recommended Citation
GB/T 7714
Han, Hui-Jie,Lu, Xiao-Ping,Yang, Ya-Zhou,et al. Study of the Modified Gaussian Model on olivine diagnostic spectral features and its applications in space weathering experiments[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2020,20(8):129.
APA Han, Hui-Jie,Lu, Xiao-Ping,Yang, Ya-Zhou,Zhang, Hao,&Mutelo, Admire Muchimamui.(2020).Study of the Modified Gaussian Model on olivine diagnostic spectral features and its applications in space weathering experiments.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,20(8),129.
MLA Han, Hui-Jie,et al."Study of the Modified Gaussian Model on olivine diagnostic spectral features and its applications in space weathering experiments".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 20.8(2020):129.
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