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16 - Geochemical Interpretations Using Multiple Remote Datasets

from Part III - Analysis Methods

Published online by Cambridge University Press:  15 November 2019

By
Suniti Karunatillake ,
Lynn M. Carter ,
Heather B. Franz ,
Lydia J. Hallis  and
Joel A. Hurowitz
Edited by
Janice L. Bishop ,
James F. Bell III  and
Jeffrey E. Moersch
Janice L. Bishop
Affiliation:
SETI Institute, California
James F. Bell III
Affiliation:
Arizona State University
Jeffrey E. Moersch
Affiliation:
University of Tennessee, Knoxville
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Summary

The advent of multiple orbital and in situ missions to planetary bodies beyond Earth has enabled characterization of extraterrestrial shallow crustal processes. We describe examples of interpreting geochemical, isotopic, and radar properties from multiple remote datasets, supplemented with in situ observations from rovers and landers, meteorites, and lunar samples. Given the availability of distinct data types and the relevance to bulk-silicate bodies in the Solar System, we present five case studies for the Moon and Mars. The first involves lunar magmatic processes in relation to TiO2 and radargram-derived physical properties. Next, O and Fe isotope variations relative to the Mg number provide insight into the degree of fractional crystallization in lunar lava flows. Physical mixing of endmembers and chemical weathering processes in Gusev crater soil on Mars are discussed. Effective use of the Chemical Index of Alteration (CIA) is also considered by comparing mineralogic observations across Mars with terrestrial references. Lastly, the nature of bulk soil hydration on Mars is described by assessing chemical variations with Principal Component Analysis (PCA). This chapter describes in situ analyses and mapping across local and regional scales. Data synthesis also involves contrasting depth scales from tens of microns to multiple kilometers.

Keywords

gamma-ray spectroscopyChemical Index of AlterationPrincipal Component AnalysisMixing modelsradarradargramgeochemicalisotopicmineralogicradar reflectanceAPXSregolith
Type
Chapter
Information
Remote Compositional Analysis
Techniques for Understanding Spectroscopy, Mineralogy, and Geochemistry of Planetary Surfaces
 , pp. 337 - 348
Publisher: Cambridge University Press
Print publication year: 2019

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