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- W1489245745 abstract "Volatiles are critical in understanding the history of the solar system. We conducted two case studies intended to further this understanding. First, we analyzed the presence of CO2 on Iapetus. Second, we evaluated aqueous alteration in CM chondrites. We studied the distribution, stability and production of CO2 on Saturn's moon Iapetus. We determined that CO2 is concentrated exclusively on Iapetus' dark material with an effective thickness of 31 nm. The total CO2 on Iapetus' surface is 2.3x10 kg. However, CO2 should not be present because it has a limited residence time on the surface of Iapetus. Our thermal calculations and modeling show that CO2 in the form of frost will not remain on Iapetus' surface beyond a few hundred years. Thus, it must be complexed with dark material. However, photodissociation will destroy the observed inventory in ~1/2 an Earth year. The lack of thermal and radiolytic stability requires an active source. We conducted experiments showing UV radiation generates CO2 under Iapetus-like conditions. We created a simulated regolith by mixing crushed water ice with isotopically labeled carbon. We then irradiated it with UV light at low temperature and pressure, producing 1.1x10 parts m s. Extrapolating to Iapetus, photolysis could generate 8.4x10 kg y, which makes photolytic production a good candidate for the source of the CO2 detected on Iapetus. We also studied the aqueous alteration of metal-bearing assemblages in CM chondrites. We examined Murchison, Cold Bokkeveld, Nogoya, and Murray using" @default.
- W1489245745 created "2016-06-24" @default.
- W1489245745 creator A5078291156 @default.
- W1489245745 date "2009-12-01" @default.
- W1489245745 modified "2023-09-24" @default.
- W1489245745 title "Volatiles on solar system objects: Carbon dioxide on Iapetus and aqueous alteration in CM chondrites" @default.
- W1489245745 hasPublicationYear "2009" @default.
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