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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 l.jpg

GEOL3045: Planetary Geology

Lysa Chizmadia

SNC Meteorites


Introduction l.jpg
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 l.jpg
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 l.jpg
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 l.jpg
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 l.jpg
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 l.jpg
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 l.jpg
Magnetites

nai.nasa.gov

zebu.uoregon.edu

Terrestrial

(Magnetotactic

Bacteria)

ALH84001

science.nasa.gov

ciencia.nasa.gov


Etched volcanic glass l.jpg
Etched Volcanic Glass

Nakhla

Terrestrial

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


Summary l.jpg
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


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