GEO 330 Lecture Notes - Lecture 21: Thermal Emission Imaging System, Thermal Emission Spectrometer, Basaltic Andesite

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View of crustal composition on mars revolutionized by modern era of remote sensing, starting with the thermal emission spectrometer (tes) instrument in 1997. Several other instruments have contributed significantly to mineralogical studies at both global and local scales: O(cid:271)ser(cid:448)atoire pour la mi(cid:374) ralogie, l"eau, les gla(cid:272)es et l"a(cid:272)ti(cid:448)it (cid:894)omega(cid:895) Remote sensing data, combined with information from mars rovers and snc meteorites provides a picture of a compositionally diverse planet. Entrainment of crust as magma ascends to surface. Additional diversification of crustal composition occurs as primary igneous minerals are subjected to chemical weathering at the surface. Several snc meteorite classes fall within the basalt category in the alkali vs silica plot used to classify volcanic rocks. In general, remote sensing measurements produce compositions that are more silicic than snc meteorites -- reflected as higher plagioclase content. Mineral crystal lattices vibrate at frequencies that release ir radiation. Each mineral has a unique crystal structure, giving it a unique ir spectrum.

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