OLIVINE ON MARCH meteorite-mars.com Mars, a planet too rich in olivine?
By the 29.05.2005 at 23:17, updated on 29.05.2005 at 23:17
The discovery of a very large Martian region rich in olivine strengthens the arguments of those who do not think that water has poured one day in abundance on the surface of Mars.
Philip Christensen (University of Arizona) and Victoria Hamilton (University of Hawaii) claim that in the volcanic region near Syrtis Major, olivine deposits extend over more than 110,000 km2, almost four times as much. we did not think. Olivine, a silicate of iron and magnesium of green color, degrades very rapidly in the presence of water.
The presence of a large amount of olivine in this ancient region of Mars would mean that water was very little present. Olivine deposits were first discovered using data from the Mars Global Surveyor. They were then supposed to extend over approximately 30,000 km2.
This time the researchers used data from Mars Odyssey's Thermal Emission Imaging System (THEMIS). They publish their results in the journal Geology https: //www.sciencesetavenir.fr /.../ march-a-planet-too ... month of June.
This is not the first time researchers have relied on the data from these two orbiters to paint a dry, cold picture of Mars's past.
In an article published in Science in 2003, Christensen and his colleagues pointed out the absence of large expanses of carbonates, sediments whose presence would have testified to the past presence of oceans on the surface of Mars. This finding was confirmed by the team of Jean-Pierre Bibring (IAS / CNRS), who analyzed the data taken by the Omega camera Mars Express, spreading a little more the idea of a hot and humid past in the world. childhood of Mars.
OLIVIN AND PYROXENE DIVERSITY IN THE CRUST OF MARS
Mustard J.F., Chicken F., Gendrin A., Bibring J.-P., Langevin Y., Gondet B., Mangold N., Bellucci G., Altieri F.
Summary: Data from the Observatory for Mineralogy, Water, Ice, and Activity (OMEGA) on the Mars Express spacecraft identify the distinct mafic, rock-forming minerals olivine, low-calcium pyroxene (LCP), and high -calcium pyroxene (HCP) on the surface of Mars. Olivine- and HCP-rich regions are found in deposits of the age range of geologic units. However, LCP-rich regions are found in the ancient Noachian-aged units, which suggests that they are derived from aluminum and calcium. Extended dark areas in the northern plains exhibit no evidence of strong mafic absorptions or absorptions due to hydrated materials.
thank s https://mars-express.cnes.fr/.../publis/abstract_publi6.htm
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