月表镁尖晶石矿物的光谱特征与遥感探测:以第谷撞击坑为例

发布时间：2018-05-14 21:51

本文选题：镁尖晶石 + 辐射传输模型　；参考：《中国科学:物理学力学天文学》2016年02期

【摘要】：月球镁尖晶石矿物隶属于深成岩,可以通过撞击作用被带到月表,它蕴含月壳深部甚至月幔的成分信息,对于研究月壳岩石成因与岩浆演化具有重要意义.本文分别从实验室和遥感研究两方面系统回顾月球镁尖晶石矿物的研究进展,以辐射传输模型为基础,作出了镁尖晶石与辉石、橄榄石和斜长石等矿物的一系列定量混合光谱.我们发现辉石与镁尖晶石矿物的相对含量与光谱波段比值之间存在对数关系,由此利用二次方程来拟合这种关系,建立了镁尖晶石矿物定量反演模型.以第谷(Tycho)撞击坑为例,我们利用遥感成像光谱数据(M~3)发现其中央峰主要矿物有辉石、斜长石和镁尖晶石等,尤其是发现了辉石与镁尖晶石的混合分布,但并未发现橄榄石矿物.利用上述矿物反演模型获得的混合矿物中镁尖晶石比例约为5.4vol% 6.4vol%,这与实验室月球样品的研究结果相符.我们推测这种辉石与镁尖晶石的混合矿物可能属于深成岩,被撞击作用抬升到月表,其中橄榄石只在坑壁附近发现有小范围的分布,可能属于浅层侵入岩.
[Abstract]:The lunar magnesite minerals belong to the deep diagenetic rocks and can be brought to the moon surface by impact, which contains the composition information of the deep lunar crust and even the lunar mantle, which is of great significance for the study of the genesis and magmatic evolution of the lunar crust rocks. In this paper, the research progress of lunar magnesium spinel minerals is reviewed systematically from laboratory and remote sensing studies. Based on the radiative transport model, a series of quantitative mixing spectra of magnesium spinel with pyroxene, olivine and plagioclase are obtained. It is found that there is a logarithmic relationship between the relative content of pyroxene and magnesium spinel mineral and the ratio of spectral band. The quantitative inversion model of magnesium spinel mineral is established by using the quadratic equation to fit the relationship. Taking Tycho impact crater as an example, we find that the main minerals of the central peak are pyroxene, plagioclase and magnesium spinel, especially the mixed distribution of pyroxene and magnesium spinel, but no olivine mineral. The proportion of magnesium spinel in the mixed minerals obtained by using the above mineral inversion model is about 5.4 voll%, which is in agreement with the experimental results of lunar samples. We conjecture that the mixed mineral of pyroxene and magnesium spinel may belong to the deep diagenetic rock and be uplifted to the moon surface by impact. The olivine is only found to be distributed in a small area near the pit wall, which may belong to the shallow intrusive rock.
【作者单位】：山东大学空间科学研究院山东省光学天文与日地空间环境重点实验室;中国科学院月球与深空探测重点实验室;
【基金】：国家自然科学基金(批准号:41490634,41473065,U1231103和41373068) 山东省自然科学基金(编号:JQ201511,ZR2015DQ001和2015ZRE27590) 中国科学院重点部署项目(编号:KGZD-EW-603) 中国科学院月球与深空探测重点实验室开放基金项目山东大学(威海)青年学者未来计划(编号:2015WHWLJH14)联合资助
【分类号】：P184.5

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