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Wet, Carbonaceous Asteroids: Altering Minerals, Changing Amino Acids Aqueous alteration has substantially.

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Presentation on theme: "Wet, Carbonaceous Asteroids: Altering Minerals, Changing Amino Acids Aqueous alteration has substantially."— Presentation transcript:

1 http://www.psrd.hawaii.edu/April11/amino_acids.html Wet, Carbonaceous Asteroids: Altering Minerals, Changing Amino Acids Aqueous alteration has substantially affected the mineralogy of many carbonaceous chondrites. An unaltered chondrule + Water

2 http://www.psrd.hawaii.edu/April11/amino_acids.html Amino AcidsAmino Acids Amino acids are characterized by the presence of an amine group, NH 2, and a carboxylic acid group, COOH, joined to side chains (R). Two examples are shown. Amino acids also can have symmetrical differences in their structures, mirror images of each other. Shown are L - isovaline and D -isovaline. NASA /Mary Pat Hrybyk-Keith

3 http://www.psrd.hawaii.edu/April11/amino_acids.html Changes in the Amino Acid Mix with Aqueous Alteration Increasing alteration causes the abundance of  -Alanine to increase, others to decrease. Modified from Glavin et al., 2011.

4 http://www.psrd.hawaii.edu/April11/amino_acids.html Changes in L/D with Aqueous AlterationChanges in L/D with Aqueous Alteration Aqueous alteration appears to have enriched isovaline in the L structure, suggesting that this could have happened on the early Earth or that carbonaceous chondrite asteroids added an already asymmetrical mix to the Earth. Graphic prepared with data from Glavin et al. (2011).

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