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(Article of periodic en Anglais - 2012)

Document title

Spectral and petrologic analyses of basaltic sands in Ka'u Desert (Hawaii) – implications for the dark dunes on Mars

Authors(s) and Affiliation(s)

TIRSCH D. (1) ; CRADDOCK R.A. (2) ; PLATZ T. (3) ; MATURILLI A. (1) ; HELBERT J. (1) ; JAUMANN R. (1 3) ;
(1) Inst. of lanetary Research, German Aerospace Center (DLR), Berlin, ALLEMAGNE
(2) Center for Earth and Planetary Studies, National Air and Space Museum, Smithsonian Institution, Washington, DC, ETATS-UNIS
(3) Dep. of Geological Sciences, freie Univ., Berlin, ALLEMAGNE

Abstract

The AA. characterize basaltic dunes from the Ka'u Desert in Hawaii using optical microscopes, electron microprobe, and spectral analyses. They compare the spectra of terrestrial and Martian dune sands to determine possible origins of the Martian dark sediments. Their results show that the terrestrial sands consist primarily of medium to coarse sand-sized volcanic glass and rock fragments as well as olivine, pyroxene, and plagioclase minerals. The sample composition indicates that the material was derived from phreatomagmatic eruptions partially with additional proportions of rock fragments from local lava flows. Grain shape and size indicate the materials were transported by aeolian processes rather than by fluvial processes. A spectral mineralogical correlation between the terrestrial and Martian aeolian sands shows a similarity consistent with an origin from volcanic ash and lava. The AA. suggest that the Martian deposits may contain similar abundances of volcanic glass, which has not yet been distinguished in Martian spectral data

Source

Article of periodic

published at : Earth surface processes and landforms / ISSN 0197-9337 / CODEN ESPLDB

Editor : Wiley, Chichester - ROYAUME-UNI (1981)

Millesime : 2012, vol. 37, no4 [pp. 434-448]

Bibliographic references : 2 p.

Collation : 10 fig., 2 tabl.

Language

Anglais

INIST-CNRS, Cote INIST : 17355

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/esp.2266

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2012
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