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Title: Signatures of the Martian regolith components entrained in some impact‐melt glasses in shergottites

Journal Article · · Meteoritics and Planetary Science
DOI:https://doi.org/10.1111/maps.13177· OSTI ID:1464560
ORCiD logo [1];  [2];  [3];  [4];  [5];  [6];  [7];  [8]
  1. SCI Johnson Space Center Houston Texas 77058 USA
  2. XI/NASA Johnson Space Center Houston Texas 77058 USA
  3. Jacob JETS NASA Johnson Space Center Houston Texas 77058 USA, UTEP–CASSMAR El Paso Texas 79968 USA
  4. Department of Geophysical Sciences University of Chicago Chicago Illinois 60439 USA, CARS Argonne National Laboratory Argonne Illinois 60439 USA
  5. Max‐Planck Institute für Chemie D‐55020 Mainz Germany
  6. Jacobs Johnson Space Center Houston Texas 77058 USA
  7. HEPCO Jacobs Engineering Johnson Space Center Houston Texas 77058 USA
  8. Barios Technology NASA Johnson Space Center Houston Texas 77058 USA

Abstract Martian regolith components are found in some impact melts ( IM ) containing Martian atmospheric gases in the shergottites Elephant Moraine ( EET ) 79001, Tissint, Zagami, and Shergotty. Excess sulfur abundances provide strong indicators for the presence of an exogenous component. High sulfur abundances and the SO 3 ‐SiO 2 correlation in polished thin section ( PTS ) EET 79001,507 (here #507) are comparable to those in Martian soils. Correlations of SO 3 with FeO in #507 from Lithology B and of CaO and Al 2 O 3 in EET 79001,506 (here #506) from Lithology A suggest the possible occurrence of two varieties of sulfate‐bearing phases in impact‐melt precursors. Fe/S (atomic) ratios of 1.02–1.34 determined in several sulfide blebs in #507 differ from those determined in igneous sulfides (Fe/S = 0.92), and suggest that most sulfide blebs in #507 are not related to igneous sulfides. Fe/S (atomic) ratios in a Tissint glass range from ~0.5 (pyrite) to >1.1 suggesting a mixture of sulfur‐bearing phases. S K‐ XANES spectra of the blebs in EET 79001 and Tissint glasses show that sulfur occurs as mixed amorphous sulfide and sulfite. The δ 34 S values and the 87 Sr/ 86 Sr (I) ratios determined in EET 79001 impact melts are consistent with the proposition that the sulfide blebs result from decomposition of secondary sulfates into sulfites during shock heating followed by reduction to sulfides by isentropic cooling. These results suggest the presence in some shergottites of extraneous regolith components containing oxidized S‐bearing species resembling sulfur species present in Martian soils.

Sponsoring Organization:
USDOE
Grant/Contract Number:
DE‐AC02‐06CH11357
OSTI ID:
1464560
Journal Information:
Meteoritics and Planetary Science, Journal Name: Meteoritics and Planetary Science Vol. 53 Journal Issue: 12; ISSN 1086-9379
Publisher:
Wiley-BlackwellCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 6 works
Citation information provided by
Web of Science

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