EAS206 Lecture Notes - Lecture 23: Galilean Moons, Magnetotaxis, Carbonate Minerals
30 Apr 2018
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• Carbonate minerals (yellow thing)
o Water was precipitating through this work at 3.9 Ga
▪ Precipitate these carbonate rosettes
▪ Different composition = different colours
• Magnetite are elongate
o Bacteria that have a single crystal or a strand of crystal of magnetotactic material
allows them to orient themselves on Earth
• 25oC water that was percolating through the rock
• Map of Mars (bottom middle): Mars meteorites recognized 1996 FOLLOW THE
WATER
• Why Sample Return?
o Goal is to check for past life on Mars
• NES Context
o Volcanism happens 3.7 Ga
o The transition of minerals = critical time in Mars history (volcanism dwindles,
lose magnetic field slowly, atmosphere pressure decreases)
• The tinier the ellipse, the more precise your landing is
The Next Steps in Mars Sample Return
The Big Picture
• Planetary Matter
o Chemicals that accreted to form the bodies
o How much material was required to form those bodies
• Planetary Energy
o Drives the geologic evolution
o Type of energy that caused the formation
• THERMAL EVOLUTION = GEOLOGIC EVOLUTION
o Loss of heat
▪ How heat is transferred and lost to space dictates the evolution of the
planet
• Size
• Composition
• Energy content and heat transfer
• Figure . Cue
o Bak left orner is
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