title: Chemical Gardens as Flow-through Reactors Simulating Natural Hydrothermal Systems.
abstract: Here we report experimental simulations of hydrothermal chimney growth using injection chemical garden methods. The versatility of this type of experiment allows for testing of various proposed ocean / hydrothermal fluid chemistries that could have driven reactions toward the origin of life in environments on the early Earth, early Mars, or even other worlds such as the icy moons of the outer planets. We show experiments that include growth of chemical garden structures under anoxic conditions simulating the early Earth, inclusion of trace components of phosphates / organics in the injection solution to incorporate them into the structure, a switch of the injection solution to introduce a secondary precipitating anion, and the measurement of membrane potentials generated by chemical gardens. Using this method, self-assembling chemical garden structures were formed that mimic the natural chimneys precipitated at submarine hydrothermal springs, and these precipitates can be used successfully as flow-through reactors by feeding through multiple successive "hydrothermal" injections.
authors.affiliation: NASA Jet Propulsion Laboratory, California Institute of Technology; NASA Astrobiology Institute, Icy Worlds; Blue Marble Space Institute of Science; Laura.M.Barge@jpl.nasa.gov.
authors.forename: Laura M
authors.initials: LM
authors.lastname: Barge
authors.affiliation: NASA Jet Propulsion Laboratory, California Institute of Technology; NASA Astrobiology Institute, Icy Worlds.
authors.forename: Yeghegis
authors.initials: Y
authors.lastname: Abedian
authors.affiliation: NASA Jet Propulsion Laboratory, California Institute of Technology; NASA Astrobiology Institute, Icy Worlds.
authors.forename: Ivria J
authors.initials: IJ
authors.lastname: Doloboff
authors.affiliation: NASA Jet Propulsion Laboratory, California Institute of Technology; Blue Marble Space Institute of Science; Citrus College.
authors.forename: Jessica E
authors.initials: JE
authors.lastname: Nuñez
authors.affiliation: NASA Jet Propulsion Laboratory, California Institute of Technology; NASA Astrobiology Institute, Icy Worlds.
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Russell
authors.affiliation: NASA Jet Propulsion Laboratory, California Institute of Technology.
authors.forename: Richard D
authors.initials: RD
authors.lastname: Kidd
authors.affiliation: NASA Jet Propulsion Laboratory, California Institute of Technology; NASA Astrobiology Institute, Icy Worlds.
authors.forename: Isik
authors.initials: I
authors.lastname: Kanik