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domingo, 21 de febrero de 2016

NASA: Jarosite in the Noctis Labyrinthus Region of Mars.- Jarosita en el Labyrinthus Región Noctis de Marte

Hola amigos: A VUELO DE UN QUINDE EL BLOG., Esta imagen, adquirida el 24 de noviembre 2015 mediante la cámara Experimento Científico de Imágenes de Alta Resolución (HiRISE) a bordo del Orbitador de Reconocimiento de Marte de la NASA, muestra el lado occidental de una depresión alargada en boxes en la región oriental Noctis Labyrinthus de Marte. A lo largo de la pared superior de la fosa es un depósito de capas de color claro. Noctis Labyrinthus es una enorme región de valles tectónicamente controlados ubicados en el extremo occidental del sistema de cañones de los Valles Marineris en Marte.
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Light toned layered pit depression on surface of Mars
This image, acquired on Nov. 24, 2015 by the High Resolution Imaging Science Experiment (HiRISE) camera aboard NASA's Mars Reconnaissance Orbiter, shows the western side of an elongated pit depression in the eastern Noctis Labyrinthus region of Mars. Along the pit's upper wall is a light-toned layered deposit. Noctis Labyrinthus is a huge region of tectonically controlled valleys located at the western end of the Valles Marineris canyon system.

Spectra extracted from the light-toned deposit by the spacecraft's Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) instrument are consistent with the mineral jarosite, which is a potassium and iron hydrous sulfate. On Earth, jarosite can form in ore deposits or from alteration near volcanic vents, and indicates an oxidizing and acidic environment. The Opportunity rover discovered jarosite at the Meridiani Planum landing site, and jarosite has been found at several other locations on Mars, indicating that it is a common mineral on the Red Planet.

The jarosite-bearing deposit observed here could indicate acidic aqueous conditions within a volcanic system in Noctis Labyrinthus. Above the light-toned jarosite deposit is a mantle of finely layered darker-toned material. CRISM spectra do not indicate this upper darker-toned mantle is hydrated. The deposit appears to drape over the pre-existing topography, suggesting it represents an airfall deposit from either atmospheric dust or volcanic ash.

The University of Arizona, Tucson, operates HiRISE, which was built by Ball Aerospace & Technologies Corp., Boulder, Colo. NASA's Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the Mars Reconnaissance Orbiter Project for NASA's Science Mission Directorate, Washington.
Image Credit: NASA/JPL-Caltech/Univ. of Arizona
Caption: Cathy Weitz
Last Updated: Feb. 19, 2016
Editor: Sarah Loff
NASA
Guillermo Gonzalo Sánchez Achutegui
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