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Examining Structural and Related Spectral Change in Mars-relevant Phyllosilicates After Experimental Impacts Between 10–40 GPa

Published online by Cambridge University Press:  01 January 2024

Lonia R. Friedlander ,
Timothy D. Glotch ,
Brian L. Phillips ,
John S. Vaughn  and
Joseph R. Michalski
Lonia R. Friedlander*
Affiliation:
Geosciences Department, 255 Earth and Space Sciences (ESS) Building, Stony Brook University, Stony Brook, NY, 11794-2100 USA
Timothy D. Glotch
Affiliation:
Geosciences Department, 255 Earth and Space Sciences (ESS) Building, Stony Brook University, Stony Brook, NY, 11794-2100 USA
Brian L. Phillips
Affiliation:
Geosciences Department, 255 Earth and Space Sciences (ESS) Building, Stony Brook University, Stony Brook, NY, 11794-2100 USA
John S. Vaughn
Affiliation:
Geosciences Department, 255 Earth and Space Sciences (ESS) Building, Stony Brook University, Stony Brook, NY, 11794-2100 USA
Joseph R. Michalski
Affiliation:
Planetary Science Institute, 1700 E. Fort Lowell, Tucson, AZ, 85719 USA
*
*E-mail address of corresponding author: loniarf@gmail.com
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Abstract

Accurate clay mineral identification is key to understanding past aqueous activity on Mars, but martian phyllosilicates are old (>3.5 Ga) and have been heavily bombarded by meteoroid impacts. Meteoroid impacts can alter clay mineral structures and spectral signatures, making accurate remote sensing identifications challenging. This paper uses nuclear magnetic resonance (NMR) spectroscopy to examine the short-range structural deformation induced in clay mineral samples of known composition by artificial impacts and calcination. Structural changes are then related to changes in the visible-near infrared (VNIR) and mid-infrared (MIR) spectra of these clay mineral samples. The susceptibility of phyllosilicates to structural deformation after experimental impacts varies by structure. Experimental results showed that trioctahedral, Mg(II)-rich saponite was structurally resilient up to peak pressures of 39.8 GPa and its unchanged post-impact spectra reflected this. Experimental data on kaolinite showed that this Al(III)-rich, dioctahedral phyllosilicate was susceptible to structural alteration at peak pressures ⩾ 25.1 GPa. This result is similar to previously reported experimental results on the Fe(III)-rich dioctahedral smectite nontronite, suggesting that dioctahedral phyllosilicates may be more susceptible to shock-induced structural deformation than trioctahedral phyllosilicates. The octahedral vacancies present in dioctahedral phyllosilicates may drive this increased susceptibility to deformation relative to trioctahedral phyllosilicates with fully occupied octahedral sheets. Thermal alteration accompanies shock in meteoroid impacts, but shock differs from thermal alteration. NMR spectroscopy showed that structural deformation in thermally altered phyllosilicates differs from that found in shocked phyllosilicates. Similar to shock, dioctahedral phyllosilicates are also more susceptible to thermal alteration. This differential susceptibility to impact-alteration may help explain generic smectite identifications from heavily bombarded terrains on Mars.

Keywords

Dioctahedral PhyllosilicatesMartian Remote SensingMeteoroid ImpactsStructural DeformationTrioctahedral Phyllosilicates
Type
Article
Information
Clays and Clay Minerals , Volume 64 , Issue 3 , June 2016 , pp. 189 - 209
Copyright
Copyright © Clay Minerals Society 2016

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