présentation powerpoint - cps-jp.orgmosir/pub/2016/2016-06-16/01_baratoux/lec… · présentation...
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Olympus Mons
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McSween et al. 2009, Science
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… and now igneous diversity at Gale crater !
Intrusive quartz-Fd rocks at Gale crater
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Neumann et al., 2004
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Density from CIPW norm
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Martian Basalts are dense
> 3200 kg/m3
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Martian meteorites are dense
Baratoux et al., 2014, Journal of Geophysical Research (Planets)
Meteorite chemistry => CIPW norm => Density
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Martian meteorites are dense
Baratoux et al., 2014, Journal of Geophysical Research (Planets)
Meteorite chemistry => CIPW norm => Density
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Density from CIPW norm
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Corerco, rco
Mantle (rm, rm)
Crust (R, rcr)
Depth-dependent mantle density
2 equations, 5 unknowns(rm,rm,rco,rco,rcr)
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Mantle density at the Moho
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Baratoux et al., 2014 – JGR-Planets
Existence of a buried felsic/anorthositic (light) component
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What is the origin of the buried felsic component ?
Arndt, 2014
Wet partial melting of crustal basalts and recycling of the residue ?
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Formation of a floatation crust (plagioclase) in a dry/shallow magma ocean ?
?
Dry shallow magma ocean allows the formation of felsdpar-rich lithologies (e.g., tonalite, anorthosite) by segregation of mafic crystals from Si-rich evolved liquids crystallizing at the surfaceMorse, Earth and Plan. Sc. Letters, 1986Harrison, Ann. Rev. Earth Plan. Sc., 2009.
Elkins-Tanton, 2012
What is the origin of the buried felsic component ?
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