伽利略号近红外测绘光谱仪探测到木卫二表面的盐类。NIMS团队。

Salts on Europa's surface detected by Galileo's near infrared mapping spectrometer. The NIMS Team.

作者信息

McCord T B, Hansen G B, Fanale F P, Carlson R W, Matson D L, Johnson T V, Smythe W D, Crowley J K, Martin P D, Ocampo A, Hibbitts C A, Granahan J C

机构信息

Hawaii Institute of Geophysics and Planetology, University of Hawaii, Honolulu, HI 96822, USA.

出版信息

Science. 1998 May 22;280(5367):1242-5. doi: 10.1126/science.280.5367.1242.

DOI:10.1126/science.280.5367.1242

PMID:9596573

Abstract

Reflectance spectra in the 1- to 2.5-micrometer wavelength region of the surface of Europa obtained by Galileo's Near Infrared Mapping Spectrometer exhibit distorted water absorption bands that indicate the presence of hydrated minerals. The laboratory spectra of hydrated salt minerals such as magnesium sulfates and sodium carbonates and mixtures of these minerals provide a close match to the Europa spectra. The distorted bands are only observed in the optically darker areas of Europa, including the lineaments, and may represent evaporite deposits formed by water, rich in dissolved salts, reaching the surface from a water-rich layer underlying an ice crust.

摘要

伽利略号近红外测绘光谱仪获取的木卫二表面1至2.5微米波长区域的反射光谱显示出扭曲的水吸收带，这表明存在水合矿物。诸如硫酸镁和碳酸钠等水合盐矿物以及这些矿物的混合物的实验室光谱与木卫二光谱非常匹配。这些扭曲的谱带仅在木卫二光学较暗的区域被观测到，包括断层，它们可能代表了富含溶解盐的水从冰壳下的富水层到达表面后形成的蒸发岩沉积物。