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|Title:||Experimental Petrology to Understand Europa's Crust|
|Authors:||Muñoz Iglesias, V.|
Prieto Ballesteros, O.
|Keywords:||Europa;Experimental Petrology;Cryomagmatism;Europa's crust|
|Publisher:||American Geophysical Union: Advancing Earth and Space Science|
|Citation:||Journal of Geophysical Research: Planets 124(10): 2660-2678(2020)|
|Abstract:||The Jovian moon Europa is a prime target for astrobiology. A global subsurface water ocean and a geologically young surface provide evidence of an active planetary body with a potential deep habitable environment. Tectonism and cryomagmatism are both agents of resurfacing, with structures on the surface spatially related to reddish non‐icy materials that could represent crystallized volatile and salt‐rich fluids from the interior, possibly from the ocean or shallower aqueous bodies. Cryomagmatism could therefore be a mechanism for exposing the underlying liquid layers to the surface and could hold paramount importance for understanding the physical and chemical evolution of fluids during their ascent and emplacement and their connection with geological features at the surface. With these premises, we perform a set of laboratory experiments simulating the evolution of different fluids under the conditions in Europa's crust. These experiments allow us to constrain the physico‐chemical and textural changes experienced by the different fluids and solids that are potentially emplaced within the icy crust and determine how they are affected by such secondary processes as reheating, melting, and ultimate recrystallization (e.g., in response to the emplacement of a second diapir close to the first one or tidal reheating). Based on these experimental results, we explore the connection of cryomagmas and their evolution near the surface to geologic features present on Europa's surface, such as pits, uplifts/domes, and microchaos regions, as well as the link with explosive cryovolcanism responsible for putative plumes at Europa.|
|Description:||The presence of an internal ocean and a geologically young surface on Europa is evidence that the planetary body is still active and consequently has a potential deep habitable environment. The moon's surface is continuously being renovated by tectonic deformation and cryomagmas that reach the surface. Different structures on the surface are associated with non‐icy materials that could come from near the surface or the underlying ocean. Cryomagmatism could therefore be a mechanism for exposing materials from Europa's interior to the surface. To understand this process, we designed a set of laboratory experiments simulating the evolution of fluids of different compositions under the conditions of Europa's crust. These experiments allow us to study the physico‐chemical behavior, geochemical evolution, and the associated textures after the different fluids cool when they ascend and are emplaced in the crust. We also test how they are affected by such secondary processes as reheating, melting, and final recrystallization. Based on these experimental results, we also explore the relationship of cryomagmas and their evolution to structures that we observe on Europa's surface, such as pits, uplifts, and chaos regions, and to the possibility of explosive eruptions and the formation of large volcanic plumes.|
|Appears in Collections:||(CAB) Artículos|
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|JGR Planets - 2019 - Mu oz‐Iglesias - Experimental Petrology to Understand Europa s Crust.pdf||31,55 MB||Adobe PDF|
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