月球风暴洋火山口暗物质矿物反演及地质意义

Inversion and Geological Significance of Minerals in Dark Matter of Craters of Oceanus Procellarum of Lunar Surface

月表主要矿物的空间分布是研究月球起源及演化等科学问题的重要信息之一.以风暴洋地区为例,根据不同矿物光谱在可见光-近红外波段的吸收特征,使用印度M3(moon mineralogy mapper)数据,应用波谱特征拟合法(SFF)反演了火山口附近暗物质区域的单斜辉石、斜方辉石、橄榄石和尖晶石等铁镁质矿物的分布,反演结果显示:风暴洋地区提取的铁镁质矿物分布较集中,其中辉石含量较多,橄榄石和尖晶石含量相对较少.另外着重分析了橄榄石、尖晶石与周围矿物的关系及其地质意义.将提取结果与Lucey用于Clementine影像的光学模型填图结果进行对比显示,提取的橄榄石分布集中,但不存在大尺度的分布,这与本文的研究区域面积有关;就位置而言,二者具有较好的一致性.

There are a variety of geological structures in the Oceanus Procellarum,including 43 craters,some famous lunar mares like Mare Imbrium and Mare Frigoris,and so on.Since the Oceanus Procellarum is the candidate landing area of lunar exploration for some countries,it is important to carry out the inversion of the minerals in the dark matter of craters of the area to facilitate research,exploration and utilization of lunar resources in the future.In addition,distribution of minerals on lunar surface is important since it concerns the origin and evolution of the moon.In this paper,the Oceanus Procellarum is taken as study area,the minerals in the dark matter of crater are inversed according to the spectra absorption characteristics in the visible and near-infrared bands of different minerals like clinopyroxene,orthopyroxene,olivine and spinel from M3（moon mineralogy mapper）data by spectral feature fitting.The mafic minerals extracted from the Oceanus Procellarum are relatively concentrated.The content of pyroxene is more than spinel and olivine.And the geological significance and relationship among olivine,spinel and other extracted minerals in the vicinity are analyzed.A comparison of the mapping results of the optical model of Lucey on Clementine data reveals that the distribution of inversion results is consistent.In this paper,the extracted olivine distributed concentratively,but there is no large scale distribution,it is associated with the study area of this article.