利用黎明分幅相机彩色数据进行灶神星上HED地形的岩性填图
Lithologic Mapping of HED Terrains on Vesta using Dawn Framing Camera Color Data
摘要：
灶神星是小行星带中质量最大的完整玄武岩天体，其表面成分很有趣，因为它为我们提供了一个了解星子岩浆分化的视角，这些星子最终合并形成了类地行星。灶神星表面的岩性和成分单位的分布提供了重要的制约其岩石学演化，影响历史及其与Vestoids和howardite-eucrite-diogenite（HED）陨石的关系。使用颜色参数（波段倾斜和波段曲率）最初开发用于分析月球数据，我们已经确定和映射HED地形灶神星黎明分幅相机（FC）的彩色数据。灶神星的平均光谱与磷硅铝钙石区域的光谱相同，这表明在太阳系历史上，由于撞击园艺，表面风化层广泛混合。我们的研究结果证实了半球形的二分法（东西和南北），已被观察到早期的研究中的颜色/组成。在南半球发现的富含闪长岩的物质表明，它是在Rhasilvia和Veneneia盆地形成期间被挖掘出来的。我们的HED地区的岩性映射提供了直接的证据灶神星的岩浆演化与Diogenite单位在Rhasilvia形成下地壳的分化对象。
英文摘要：
The surface composition of Vesta, the most massive intact basaltic object in the asteroid belt, is interesting because it provides us with an insight into magmatic differentiation of planetesimals that eventually coalesced to form the terrestrial planets. The distribution of lithologic and compositional units on the surface of Vesta provides important constraints on its petrologic evolution, impact history and its relationship with Vestoids and howardite-eucrite-diogenite (HED) meteorites. Using color parameters (band tilt and band curvature) originally developed for analyzing lunar data, we have identified and mapped HED terrains on Vesta in Dawn Framing Camera (FC) color data. The average color spectrum of Vesta is identical to that of howardite regions, suggesting an extensive mixing of surface regolith due to impact gardening over the course of solar system history. Our results confirm the hemispherical dichotomy (east-west and north-south) in albedo/color/composition that has been observed by earlier studies. The presence of diogenite-rich material in the southern hemisphere suggests that it was excavated during the formation of the Rheasilvia and Veneneia basins. Our lithologic mapping of HED regions provides direct evidence for magmatic evolution of Vesta with diogenite units in Rheasilvia forming the lower crust of a differentiated object.
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