NASA Logo, External Link
Facebook icon, External Link to NASA STI page on Facebook Twitter icon, External Link to NASA STI on Twitter YouTube icon, External Link to NASA STI Channel on YouTube RSS icon, External Link to New NASA STI RSS Feed AddThis share icon
 

Record Details

Record 75 of 7729
First Direct Detection of Clay Minerals on Mars
Offline Availability: Go to Request Form
Author and Affiliation:
Singer, R. B.(Hawaii Univ., Honolulu, HI, United States)
Owensby, P. D.(Hawaii Univ., Honolulu, HI, United States)
Clark, R. N.(Geological Survey, Denver, United States)
Abstract: Magnesian clays or clay-type minerals were conclusively detected in the martian regolith. Near-IR spectral observations of Mars using the Mauna Kea 2.2-m telescope show weak but definite absorption bands near microns. The absorption band positions and widths match those produced by combined OH stretch and Mg-OH lattice modes and are diagnostic of minerals with structural OH such as clays and amphiboles. Likely candidate minerals include serpentine, talc, hectorite, and sponite. There is no spectral evidence for aluminous hydroxylated minerals. No distinct band occurs at 2.55 microns, as would be expected if carbonates were responsible for the 2.35 micron absorption. High-albedo regions such as Elysium and Utopia have the strongest bands near 2.35 microns, as would be expected for heavily weathered soils. Low-albedo regions such as Iapygia show weaker but distinct bands, consistent with moderate coatings, streaks, and splotches of bright weathered material. In all areas observed, the 2.35-micron absorption is at least three times weaker than would be expected if well-crystallized clay minerals made up the bulk of bright soils on Mars.
Publication Date: Apr 01, 1985
Document ID:
19850015301
(Acquired Nov 13, 1995)
Accession Number: 85N23612
Subject Category: LUNAR AND PLANETARY EXPLORATION
Document Type: Technical Report
Publication Information: NASA, Washington Repts. of Planetary Geol. and Geophys. Program, 1984; p 391-392
Publisher Information: United States
Financial Sponsor: NASA; United States
Organization Source: Hawaii Univ.; Honolulu, HI, United States
Description: 2p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: ABSORPTION SPECTRA; CLAYS; MARS SURFACE; MINERALS; PLANETARY COMPOSITION; ASTRONOMICAL SPECTROSCOPY; INFRARED SPECTRA; MAGNESIUM; REGOLITH
Imprint And Other Notes: In NASA, Washington Repts. of Planetary Geol. and Geophys. Program, 1984 p 391-392 (SEE N85-23474 13-91)
› Back to Top
Find Similar Records
NASA Logo, External Link
NASA Official: Gerald Steeman
Site Curator: STI Program
Last Modified: October 08, 2014
Contact Us