基于碳质球粒陨石的小行星水蚀变光谱学研究  

Spectroscopic Study of Aqueous Alteration of Asteroids Based on Carbonaceous

作　　者：余金霏 赵海斌[1,2,4] 吴昀昭 YU Jinfei;ZHAO Haibin;WU Yunzhao(Key Laboratory of Planetary Sciences,Purple Mountain Observatory,Chinese Academy of Science,Nanjing 210023,China;School of Astronomy and Space Science,University of Science and Technology of China,Hefei 230026,China;Department of General Systems Studies,Graduate School of Arts and Sciences,The University of Tokyo,3-8-1 Komaba,Meguro-ku,Tokyo 153-8902,Japan;Center for Excellence in Comparative Planetology,Chinese Academy of Science,Hefei 230026,China)

机构地区：[1]中国科学院行星科学重点实验室,紫金山天文台南京210023 [2]中国科学技术大学天文与空间科学学院,合肥230026 [3]东京大学综合文化研究科广域系统科学系,东京1538902 [4]中国科学院比较行星学卓越创新中心,合肥230026

出　　处：《深空探测学报（中英文）》2023年第6期667-676,共10页Journal Of Deep Space Exploration

基　　金：中国科学院先导B资助项目(XDB41010104);国家自然科学基金(11633009、12150009);空间碎片与近地小行星防御科研资助项目(KJSP2020020205,KJSP2020020204,KJSP2020020102,KJSP2020020101);小行星基金会资助项目;中国矿业大学“双一流”建设提升自主创新能力资助项目(2022ZZCX06)。

摘　　要：针对未来对富挥发分小行星的遥感探测需求,开展了对碳质球粒陨石水蚀变的光谱学研究。分析了15个不同蚀变程度的碳质球粒陨石的1~20μm红外光谱特征与岩石学性质,总结了水蚀变过程的光谱变异规律。结果表明:随着蚀变程度加深,指示层状硅酸盐与水分子的3μm吸收带与仅指示水分子的6μm吸收带的强度均加深,吸收中心均向短波方向移动。碳质球粒陨石的3μm吸收带随蚀变程度增加而变得尖锐,吸收带光谱形态与蛇纹石类矿物3μm吸收特征类似,而6μm吸收带形态随蚀变程度增加无明显变化。硅酸盐矿物在9~14μm特征区光谱形状也随蚀变程度增加而改变,12.4μm/11.4μm反射率比值减小,这是由于无水硅酸盐转化为层状硅酸盐。光谱变异规律未来可应用于探测小行星表面物质成分与演化历史。The aqueous alteration spectral features of carbonaceous chondrites for were studied for future volatile-rich asteroids exploration and remote sensing.The 1-20μm infrared spectral features and petrographic characteristics of 15 carbonaceous chondrites with different alteration degrees were analyzed,and the spectral variation laws of the aqueous alteration were summarized.The findings demonstrate that as the degree of alteration of carbonaceous chondrites increases,the 3μm absorption band,which indicates phyllosilicates and water molecules,and the 6μm absorption band,which indicates only water molecules,both features increasing in strength and absorption centers shift to the short-wave.With more alteration,the 3μm absorption band sharpens and resembles serpentine’s 3μm absorption feature.However,as the degree of alteration increases,the 6μm absorption band shape does not significantly change.The degree of alteration also affects the spectral shape of the 10-13μm region.This region indicates silicate features.The 12.4μm/11.4μm reflectance ratio reduces as a result of the conversion of anhydrous silicates to phyllosilicates.Also discuss possible effects that the spectra and parameters discovered during this study may have on the outcomes from asteroids.

关 键 词：小行星 碳质球粒陨石 水蚀变 光谱学 

分 类 号：P185.7[天文地球—天文学]