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Volcanic glass signatures in spectroscopic survey of newly proposed lunar pyroclastic deposits

机译:新提议的月球火山碎屑沉积物的光谱调查中的火山玻璃特征

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摘要

Moon Mineralogy Mapper spectroscopic observations are used to assess the mineralogy of five sites that have recently been proposed to include lunar dark mantle deposits (DMDs). Volcanic glasses have, for the first time, clearly been identified at the location of three of the proposed pyroclastic deposits. This is the first time that volcanic glasses have been identified at such a small scale on the lunar surface from remote sensing observations. Deposits at Birt E, Schluter, and Walther A appear to be glassy DMDs. Deposits at Birt E and Schluter show (1) morphological evidence suggesting a likely vent and (2) mineralogical evidence indicative of the presence of volcanic glasses. The Walther A deposits, although they show no morphological evidence of vents, have the spectroscopic characteristics diagnostic of volcanic glasses. The deposits of the Freundlich-Sharonov basin are separated in two areas: (1) the Buys-Ballot deposits lack mineralogical and morphological evidence and thus are found to be associated with mare volcanism not with DMDs and (2) the Anderson crater deposits, which do not exhibit glassy DMD signatures, but they appear to be associated with possible vent structures and so may be classifiable as DMDs. Finally, dark deposits near the crater Kopff are found to be associated with likelymare volcanism and not associated with DMDs. The spectral identification of volcanic glass seen in many of the potential DMDs is a strong indicator of their pyroclastic origin.
机译:Moon矿物学Mapper光谱观测用于评估五个站点的矿物学,这些站点最近被提议包括月暗幔沉积(DMD)。首次在提议的三个火山碎屑矿床的位置清楚地发现了火山玻璃。这是首次通过遥感观测在月球表面如此小规模地发现火山玻璃。 Birt E,Schluter和Walther A处的沉积物似乎是玻璃状DMD。 Birt E和Schluter的沉积物显示(1)形态学证据表明可能存在火山口,(2)矿物学证据表明存在火山玻璃。 Walther A沉积物虽然没有显示出火山口的形态学证据,但具有诊断火山玻璃的光谱特征。 Freundlich-Sharonov盆地的沉积物分为两个区域:(1)Buys-Ballot沉积物缺乏矿物学和形态学证据,因此被发现与母马的火山活动有关,而与DMD无关;(2)Anderson火山口沉积物不会显示出玻璃状DMD签名,但它们似乎与可能的通风口结构相关,因此可以归类为DMD。最后,发现科普夫火山口附近的深色沉积物与可能的马雷火山活动有关,而与DMD无关。在许多潜在的DMD中看到的火山玻璃的光谱鉴定是其火山碎屑起源的有力指标。

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