Multi-Spectral Field Study of Planetary Analog Material in Extreme Environments—Alteration Products of Volcanic Deposits of Vulcano/Italy

IF 2.9 3区 地球科学 Q2 ASTRONOMY & ASTROPHYSICS
K. Stephan, K. Rammelkamp, M. Baqué, S. Schröder, A. Pisello, K. Gwinner, G. Ortenzi, P. Irmisch, F. Sohl, V. Unnithan
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Abstract

The potential of multi-spectral investigations for planetary exploration strongly depends on the specific geologic environment and related science questions. In this work, we used a visible-near infrared spectrometer, a laser-induced breakdown spectroscopy (LIBS) instrument, and a Raman spectrometer for studying acid alteration of volcanic deposits in the field as an analog for what can be potentially observed on Mars. These deposits were studied on Vulcano, one of the Aeolian Islands/Italy, where volcanic deposits are affected by active hydrothermal alteration processes and fumarolic activity. The results show that VIS-NIR spectroscopy is sufficient to identify the major minerals formed through the alteration process. This is the only technique that can identify and characterize hydrated silica, the major alteration residue, whose spectral properties vary depending on environmental conditions and the formation process. However, only LIBS spectra allow a detailed insight into the geochemistry of the pristine volcanic deposits, which is needed to define the starting point of the alteration process. LIBS also indicated the existence of chemical elements for which no corresponding mineral could be identified in the VIS-NIR data, presumably since their spectral signature is masked by strongly absorbing species. These minerals, however, could be confirmed in the Raman spectra—nicely completing the achieved results and highlighting the high potential of the sensor suite for our study.

极端环境下行星模拟物质的多光谱场研究——意大利Vulcano火山沉积物蚀变产物
多光谱研究在行星探测中的潜力很大程度上取决于特定的地质环境和相关的科学问题。在这项工作中,我们使用了一个可见-近红外光谱仪,一个激光诱导击穿光谱(LIBS)仪器和一个拉曼光谱仪来研究野外火山沉积物的酸蚀,作为在火星上可能观察到的模拟。这些沉积物是在意大利伊奥利亚群岛之一的火山上研究的,那里的火山沉积物受到活跃的热液蚀变过程和火山喷发活动的影响。结果表明,VIS-NIR光谱足以识别蚀变过程中形成的主要矿物。这是唯一可以识别和表征水合二氧化硅的技术,主要的蚀变残留物,其光谱性质随环境条件和形成过程而变化。然而,只有LIBS光谱才能详细了解原始火山沉积物的地球化学,这是确定蚀变过程起点所必需的。LIBS还表明,在VIS-NIR数据中无法识别相应矿物的化学元素的存在,可能是因为它们的光谱特征被强吸收物质掩盖了。然而,这些矿物质可以在拉曼光谱中得到证实,这很好地完成了已取得的结果,并突出了传感器套件在我们研究中的高潜力。
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来源期刊
Earth and Space Science
Earth and Space Science Earth and Planetary Sciences-General Earth and Planetary Sciences
CiteScore
5.50
自引率
3.20%
发文量
285
审稿时长
19 weeks
期刊介绍: Marking AGU’s second new open access journal in the last 12 months, Earth and Space Science is the only journal that reflects the expansive range of science represented by AGU’s 62,000 members, including all of the Earth, planetary, and space sciences, and related fields in environmental science, geoengineering, space engineering, and biogeochemistry.
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