当前位置: X-MOL 学术Nat. Geosci. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Remote detection of widespread indigenous water in lunar pyroclastic deposits
Nature Geoscience ( IF 18.3 ) Pub Date : 2017-07-24 00:00:00 , DOI: 10.1038/ngeo2993
Ralph E. Milliken , Shuai Li

Laboratory analyses of lunar samples provide a direct means to identify indigenous volatiles and have been used to argue for the presence of Earth-like water content in the lunar interior. Some volatile elements, however, have been interpreted as evidence for a bulk lunar mantle that is dry. Here we demonstrate that, for a number of lunar pyroclastic deposits, near-infrared reflectance spectra acquired by the Moon Mineralogy Mapper instrument onboard the Chandrayaan-1 orbiter exhibit absorptions consistent with enhanced OH- and/or H2O-bearing materials. These enhancements suggest a widespread occurrence of water in pyroclastic materials sourced from the deep lunar interior, and thus an indigenous origin. Water abundances of up to 150 ppm are estimated for large pyroclastic deposits, with localized values of about 300 to 400 ppm at potential vent areas. Enhanced water content associated with lunar pyroclastic deposits and the large areal extent, widespread distribution and variable chemistry of these deposits on the lunar surface are consistent with significant water in the bulk lunar mantle. We therefore suggest that water-bearing volcanic glasses from Apollo landing sites are not anomalous, and volatile loss during pyroclastic eruptions may represent a significant pathway for the transport of water to the lunar surface.

中文翻译:

遥测月球火山碎屑沉积物中广泛的本地水

对月球样品进行实验室分析提供了一种直接方法,可识别本地挥发物,并已被用来论证月球内部是否存在类地球水含量。但是,一些挥发性元素已被解释为大块的月幔干燥的证据。在这里,我们证明,对于许多月亮火山碎屑沉积物,由Chandrayaan-1轨道器上的Moon Mineralogy Mapper仪器获得的近红外反射光谱显示出与增强的OH-和/或H 2一致的吸收含O的材料。这些增强表明,在深月球内部来源的火山碎屑物质中普遍存在水,因此是本地来源。大型火山碎屑沉积物的水丰度估计高达150 ppm,在潜在通风口区域的局部水含量约为300至400 ppm。与月球火山碎屑沉积物相关的水含量增加,以及这些沉积物在月球表面的大面积分布,广泛分布和化学变化与大量月球地幔中的大量水相符。因此,我们认为,来自阿波罗登陆点的含水火山玻璃不是异常的,火山碎屑爆发期间的挥发损失可能代表了水向月球表面传输的重要途径。
更新日期:2017-07-25
down
wechat
bug