Cosmochemical thermodynamics framework for non-equilibrium settings: the origins of primordial soups on carbonaceous asteroidal bodies
When
Where
Dr. Venkateswara Manga
Assistant Research Professor
Material Science and Engineering
University of Arizona
Thermochemistry within cosmochemical settings is a non-equilibrium problem, which is mostly modeled by employing equilibrium thermodynamics framework. Such driven and dissipating material systems are a challenge and demand new phenomenological formulations and energy criterion. Within the evolutionary scheme of planetary systems, starting from protoplanetary disks, thermochemical evolutions are modeled with specific system-and-setting definitions (e.g., nebular, small body etc.,) while trying to include the local dynamical forces. Such approaches in conjunction with a wealth of data from meteoritic and returned asteroid samples address the fundamental questions on the origins of building blocks of planets and of life. For asteroidal bodies of carbonaceous type, a novel aqueous multiphase model, which is at odds with an existing geophysical model (e.g., mudball model), has been proposed. This thermochemical model while providing a self-consistent description of the parent body processing, conditions and the reported petrology of the Bennu samples, implicitly unmasked the signatures of the microgravity on the parent body of Bennu. Most importantly, the model also revealed a mechanism and the spontaneous development of aqueous primordial soups that are enriched in otherwise the dilute concentrations of elements of life. The implications of the model to aqueous asteroidal chemistry and the geophysical models are discussed.
Host: Dr. Tom Zega
To request Zoom Meeting link, contact 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