Generation and performance of automated jarosite mineral detectors for visible/near-infrared spectrometers at Mars
نویسندگان
چکیده
We have developed two automated detectors that can recognize the sulfate mineral jarosite in unknown visible to near-infrared spectra (350– 2500 nm). The two detectors are optimized for use within the terrestrial and martian atmospheres. The detectors are built from Support Vector Machines trained using a generative model to create linear mixtures of library mineral spectra. Both detectors performed with an average ∼90% accuracy on laboratory spectra of single minerals and the laboratory and field spectra of rocks collected in a hydrothermal environment. This type of algorithm will contribute to the efficiency of onboard data analysis of landed and orbital visible/near-infrared spectrometers at Mars. © 2007 Elsevier Inc. All rights reserved.
منابع مشابه
Jarosite in a Pleistocene East African saline‐alkaline paleolacustrine deposit: Implications for Mars aqueous geochemistry
[1] Jarosite occurs within altered tephra from the saline‐alkaline paleolake deposits of Pliocene‐Pleistocene Olduvai Gorge, Tanzania. Zeolites (mainly phillipsite), authigenic K‐feldspar, and Mg/Fe‐smectites dominate the mineral assemblage, indicating saline‐ alkaline diagenetic conditions (pH > 9). As jarosite is ordinarily an indicator of acidic conditions on Earth and Mars, its association ...
متن کاملModeling near-infrared reflectance spectra of clay and sulfate mixtures and implications for Mars
High-resolution mapping by visible and near-infrared orbital spectrometers has revealed a diversity of hydrated mineral deposits on the surface of Mars. Quantitative analysis of mineral abundances within these deposits has the potential to distinguish depositional and diagenetic processes. Such analysis can also provide important constraints on the nature of putative global and local-scale mine...
متن کاملFinding mineralogically interesting targets for exploration from spatially coarse visible and near IR spectra
Spectroscopic studies of analog terrestrial mineral assemblages are necessary to develop criteria to identify similar environments on Mars. We use visible/near infrared (VNIR) laboratory, field, and remotely acquired spectral data to identify the iron-bearing and hydrous minerals of Rio Tinto, Spain, an astrobiological analog. Mineralogy evolves from iron sulfateand oxiderich (jarosite, rozenit...
متن کاملOrbital evidence for clay and acidic sulfate assemblages on Mars based on mineralogical analogs from Rio Tinto, Spain
Outcrops of hydrated minerals are widespread across the surface of Mars, with clay minerals and sulfates being commonly identified phases. Orbitally-based reflectance spectra are often used to classify these hydrated components in terms of a single mineralogy, although most surfaces likely contain multiple minerals that have the potential to record local geochemical conditions and processes. Re...
متن کاملAutomatically Identifying Minerals from Martian Orbit
Introduction The Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) is a very high resolution near infrared spectrometer currently orbiting Mars on board the Mars Reconnaissance Orbiter (MRO). Since each mineral has a unique spectral signature, it is possible to use the measurements from this instrument to identify minerals on the surface of Mars. This project describes a method[1] to...
متن کامل