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GEOL3045: Planetary Geology. Lysa Chizmadia SNC Meteorites. Introduction. Shergotty. Currently 34 All igneous rocks Three classes: Shergotites Basalts (olivine, pyroxene & plag) 150-190 Ma Nakhlites Pyroxenites (mostly pyroxene) ~1.3 Ga Chassigny Dunites (mostly olivine). Nakhla.

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geol3045 planetary geology

GEOL3045: Planetary Geology

Lysa Chizmadia

SNC Meteorites

introduction
Introduction

Shergotty

  • Currently 34
  • All igneous rocks
  • Three classes:
    • Shergotites
      • Basalts (olivine, pyroxene & plag)
      • 150-190 Ma
    • Nakhlites
      • Pyroxenites (mostly pyroxene)
      • ~1.3 Ga
    • Chassigny
      • Dunites (mostly olivine)

Nakhla

Chassigny

Images from: http://www2.jpl.nasa.gov/snc/

martian meteorites
Martian Meteorites

Los Angeles #1

  • Are probably from Mars b/c:
    • Young & basaltic
      • Recent volcanism (154 to 1300 Ma)
      • Must come from relatively large body
    • O-isotopes:
      • Form distinct mixing line
        • Similar to TFL but higher in ∂17O
      • If one from Mars, all from Mars
    • Gas bubbles trapped in glass
      • Composition ~ Viking measurements
      • N2, CO2, H2, He, Ar, Kr, Xe & isotope ratios

Los Angeles #2

Images from: http://www2.jpl.nasa.gov/snc/

Image from: http://www.psrd.hawaii.edu/July99/EETA79001.html

trapped gas bubbles
Trapped Gas Bubbles

EETA79001

Image from: http://en.wikipedia.org/wiki/Mars_meteorite

Plot from: http://www.psrd.hawaii.edu/July99/EETA79001.html

life of mars
Life of Mars?
  • PAHs:
    • ~ Antarctic meltwater
    • Not spatially near carbonates
    • C-isotopes point to terrestrial contamination
  • Carbonates:
  • Microfossils:
  • Magnetites:
  • Etched Glass:

Image from: http://en.wikipedia.org/wiki/Mars_meteorite

carbonates
Carbonates

Image from: www.fas.org

Orange: Ca, Mn-rich

Inner Black: Mg-rich

White: Fe-rich

Outer Black: Fe, S-rich

(where mt is)

Carbonate Globbules

~900oC or <80oC ?

Image from: www.ndsu.nodak.edu

Image from: cmex.ihmc.us

microfossils
Microfossils
  • SEM preparation artifact?
  • Too small for DNA?
  • Probably terrestrial contamination

Shergotty

Image from: www.astrobiology.com/ adastra/images/deadjim02.jpg

Image from: news.bbc.co.uk

Image from: www.lpi.usra.edu

magnetites
Magnetites

nai.nasa.gov

zebu.uoregon.edu

Terrestrial

(Magnetotactic

Bacteria)

ALH84001

science.nasa.gov

ciencia.nasa.gov

etched volcanic glass
Etched Volcanic Glass

Nakhla

Terrestrial

Images from: http://www.lpi.usra.edu/meetings/lpsc2006/pdf/2039.pdf

summary
Summary
  • Probably from Mars b/c:
    • Young ages
      • Must be from relatively large body
    • O-isotopes
      • If one from Mars, all are from Mars
    • Trapped gases
      • Must be from body with atmosphere like that of Mars
  • Life of Mars?
    • PAHs: terrestrial contaminations
    • Carbonates: can form inorganically
    • “Microfossils”: preparation artifacts
    • Magnetites: crystallographically not from bacteria
    • Etched Volcanic Glass: no counter argument
ad