Alteration minerals in impact-generated hydrothermal systems – exploring host rock variability

作者: Susanne P. Schwenzer , David A. Kring

DOI: 10.1016/J.ICARUS.2013.06.003

关键词:

摘要: Impact-generated hydrothermal systems have been previously linked to the alteration of Mars’ crust and production secondary mineral assemblages seen from orbit. The sensitivity resultant has not yet evaluated as a function precursor primary rock compositions. In this work, we use thermochemical modeling explore variety minerals that could be produced by altering several known lithologies based on martian meteorite For basaltic host lithology (Dhofar 378, Humphrey) main phases are feldspar, zeolite, pyroxene, chlorite, clay (nontronite, kaolinite), hematite; for lherzolithic (LEW 88516) amphibole, serpentine, an ultramafic (Chassigny) olivine, magnetite, quartz, hematite. These proportions in each those cases depend W/R temperature. Integrating geologic, hydrologic evidence, developed model illustrate distribution occur different levels impact structure. At surface, hot, hydrous affects ejecta melt sheet producing chlorite. Deeper subsurface depending permeability rock, – smectite, amphiboles hematite circulating system. modeled distributions should assist with interpretation orbital observations help guide surface exploration rovers sample return assets.

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