Shock-induced CO2 loss from CaCO3 - Implications for early planetary atmospheres

Details Shock-induced CO2 loss from CaCO3 - Implications for early planetary atmospheres Shock-induced CO2 loss from CaCO3 - Implications for early planetary atmospheres

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986e%26psl..77..409l&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 77, no. 3-4, April 1986, p. 409-418. Previously announced in STAR as

Computer Science

38

Calcium Carbonates, Carbon Dioxide Concentration, Decarbonation, Planetary Atmospheres, Shock Loads, Activation Energy, Crystal Lattices, Electron Microscopy, Thermogravimetry, Planets, Atmosphere, Shock Effects, Carbon Dioxide, Calcium Carbonate, Experiments, Calcite, Comparisons, Pressure, Volatiles, Structure, Electron Microscopy, Sem, Melts, Injection, Models, Impact Effects, Formation, Accretion, Terrestrial Planets

Scientific paper

Recovered samples from shock recovery experiments on single crystal calcite were subjected to thermogravimetric analysis to determine the amount of post-shock CO2, the decarbonization interval and the activation energy, for the removal of remaining CO2 in shock-loaded calcite. Comparison of post-shock CO2 with that initially present determines shock-induced CO2 loss as a function of shock pressure. Incipient to complete CO2 loss occurs over a pressure range of approximately 10 to approximately 70 GPa. Optical and scanning electron microscopy reveal structural changes which are related to the shock-loading. The occurrence of dark, diffuse areas, which can be resolved as highly vesticular areas as observed with a scanning electron microscope are interpreted as representing quenched partial melts, into which shock-released CO2 was injected. The experimental results are used to constrain models of shock-produced, primary CO2 atmospheres on the accreting terrestrial planets.

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