2:20 PM - 2:40 PM
[BAO01-03] The influence of aqueous alteration in carbonaceous meteorites on its soluble organic content
★Invited papers
Carbonaceous meteorites are fragments from the asteroid belt that may be used as time capsules to understand the processes that happened in the early solar system. The analysis of these organic carbon-rich meteorites provide crucial information regarding the chemical reactions that occurred on the meteorite parent bodies, solar nebula or interstellar medium. They contain a rich inventory of extra-terrestrial molecules, present as insoluble organic matter (IOM) [1, 2], and as soluble organic compounds [3-5]. Bulk analysis of the soluble organic fraction of the Murchison meteorite has revealed a high molecular diversity of tens of thousands of different molecular compositions [6]. In addition, different carbonaceous meteorites show different abundances and distributions of their soluble organic content. The reason for this is not fully understood. Aqueous alteration on the meteorite parent body of carbonaceous chondrites may play a role as it is an important alteration process of their mineral, isotopic and volatile content [7-12]. In relation to the soluble organic content, a few studies show that the relative distribution of amino acids in carbonaceous chondrites seems to be influenced by the degree of aqueous alteration on the parent body [13-16]. In this talk I will present the organic inventory of different carbonaceous meteorites, and how the extension of aqueous alteration on the meteorite parent bodies may be related to this. For example, the least aqueously altered CM chondrites have smaller L-enantiomer excess (Lee) values of isovaline [17-19]. The Paris meteorite, one of the most primitive CM chondrites analysed to date has an isovaline Lee close to zero [17]. While aqueous alteration does not create an isovaline asymmetry by itself, it may amplify an L-enantiomeric excess that was originally created by other mechanisms (e.g. ultraviolet circularly polarized light (UV-CPL) photo-processing of interstellar/circumstellar ices [20-25]).
[1] Cody and Alexander (2005) Geochimica et Cosmochimica Acta 69, 1085. [2] Alexander et al. (2013) Geochimica et Cosmochimica Acta 123, 244. [3] Cronin and Chang (1993) In The Chemistry of Life’s Origin, Kluwer Academic Publishers, pp. 209. [4] Martins and Sephton (2009) In Amino acids, peptides and proteins in organic chemistry, Wiley-VCH, pp. 1. [5] Martins (2011) Elements 7, 35. [6] Schmitt-Kopplin et al. (2010) Proceedings of the National Academy of Sciences 107, 2763. [7] Clayton and Mayeda (1984) Earth and Planetary Science Letters 67, 151. [8] Tomeoka and Buseck (1985) Geochimica et Cosmochimica Acta 49, 2149. [9] Zolensky M. and McSween H. Y. (1988) In Meteorites and the early solar system, University of Arizona Press. pp. 114. [10] Zolensky et al. (1997) Geochimica et Cosmochimica Acta 61, 5099. [11] Brownin et al. (1996) Geochimica et Cosmochimica Acta 60, 2621. [12] Palmer and Lauretta (2011) Meteoritics & Planetary Science 46, 1587. [13] Glavin et al. (2006) Meteoritics & Planetary Science 41, 889. [14] Glavin et al. (2011) Meteoritics & Planetary Science 45, 1948. [15] Pizzarello et al. (2008) Proceedings of the National Academy of Sciences 105, 3700. [16] Martins et al. (2007) Meteoritics & Planetary Science 42, 2125. [17] Martins et al. (2015) Meteoritics & Planetary Science 50, 926. [18] Glavin and Dworkin (2009) Proceedings of the National Academy of Sciences 106, 5487. [19] Pizzarello et al. (2003) Geochimica et Cosmochimica Acta 67, 1589. [20] Bonner and Rubenstein (1987) Biosystems 20, 99. [21] Bailey et al. (1998) Science 281, 672. [22] Lucas et al. (2005) Origins of Life and Evolution of the Biosphere 35, 29. [23] Meinert et al. (2012) ChemPlusChem 77, 186. [24] Meinert et al. (2014) Angewandte Chemie International Edition 53, 210. [25] Modica et al. (2014) The Astrophysical Journal 788, 79.
[1] Cody and Alexander (2005) Geochimica et Cosmochimica Acta 69, 1085. [2] Alexander et al. (2013) Geochimica et Cosmochimica Acta 123, 244. [3] Cronin and Chang (1993) In The Chemistry of Life’s Origin, Kluwer Academic Publishers, pp. 209. [4] Martins and Sephton (2009) In Amino acids, peptides and proteins in organic chemistry, Wiley-VCH, pp. 1. [5] Martins (2011) Elements 7, 35. [6] Schmitt-Kopplin et al. (2010) Proceedings of the National Academy of Sciences 107, 2763. [7] Clayton and Mayeda (1984) Earth and Planetary Science Letters 67, 151. [8] Tomeoka and Buseck (1985) Geochimica et Cosmochimica Acta 49, 2149. [9] Zolensky M. and McSween H. Y. (1988) In Meteorites and the early solar system, University of Arizona Press. pp. 114. [10] Zolensky et al. (1997) Geochimica et Cosmochimica Acta 61, 5099. [11] Brownin et al. (1996) Geochimica et Cosmochimica Acta 60, 2621. [12] Palmer and Lauretta (2011) Meteoritics & Planetary Science 46, 1587. [13] Glavin et al. (2006) Meteoritics & Planetary Science 41, 889. [14] Glavin et al. (2011) Meteoritics & Planetary Science 45, 1948. [15] Pizzarello et al. (2008) Proceedings of the National Academy of Sciences 105, 3700. [16] Martins et al. (2007) Meteoritics & Planetary Science 42, 2125. [17] Martins et al. (2015) Meteoritics & Planetary Science 50, 926. [18] Glavin and Dworkin (2009) Proceedings of the National Academy of Sciences 106, 5487. [19] Pizzarello et al. (2003) Geochimica et Cosmochimica Acta 67, 1589. [20] Bonner and Rubenstein (1987) Biosystems 20, 99. [21] Bailey et al. (1998) Science 281, 672. [22] Lucas et al. (2005) Origins of Life and Evolution of the Biosphere 35, 29. [23] Meinert et al. (2012) ChemPlusChem 77, 186. [24] Meinert et al. (2014) Angewandte Chemie International Edition 53, 210. [25] Modica et al. (2014) The Astrophysical Journal 788, 79.