| Mineral composition of mare basalt reflects chemical composition of Magma source together with physical and chemical environment of the rock’s formation,which provides significant information for both researches of origin and evolution of the Moon and exploitation and utilization of lunar resource.Different from other circular mares,Mare Frigoris is narrow and long,expanding across much longitude,and thus may have relation with mares around on source region.The geological structure of Frigoris is complex and diverse,which attracts the attention of scientists.However,there are few articles about mineralogy composition of Mare Frigoris and different analysis results may be led by diverse basalt units delineation.In view of the above,this research’s purpose is to optimize the division of basalt units,improve mineral analysis precision,and combined with the mineral composition,elements and age characteristics of neighboring mare,to investigate the correlation between basalt source regions.Mare Frigoris was mapped and characterized into 25 basalt units based on multi-source remote sensing data including spectrum,terrain and elements abundance.Hyperspectral data has many bands and high spectral resolution,which is especially sensitive to the diagnostic absorption properties of minerals,and it has great advantages in the study of composition identification.In this study,Moon Mineralogy Mapper(M3)hyperspectral data was applied to explore mineral spatial distribution of Mare Frigoris.We extracted 169 spectra curves of fresh craters from M3 hyperspectral image based on the visual effect of crater’s state and spectral curve’s shape.Spectral parameters such as absorption center and absorption band area ratio were obtained through data processing procedures including curve smoothing and continnum removal methods.Mafic mineral variation of Mare Frigoris basalt was acquired by analyzing reflectance spectra’s absorption features.Basalt units in eastern Frigoris are older,with mafic mineral dominated by clinopyroxene containing lower CaO compared to returned lunar samples,which is similar to older basalt units in Mare Serenitatis and Mare Imbrium.Basalt units of western Frigoris and Sinus Roris are younger and rich in olivine.And the late stage basalts in Oceanus Procellarum and Mare Imbrium show the same feature too.These wide-spread olivine-rich basalts suggest the uniqueness in the global evolution of the moon.Geographically speaking,Frigoris is an individual mare,but it’s source region may have connections with mares around in consideration of mineral differences between western and eastern Frigoris as well as mineral similarities with mares at the same location. |
