[Eoas-seminar] Tuesday Feb 4th Faculty Candidate for Solid Earth Processes in the Lithosphere (Hector Manadrid)

eoas-seminar at lists.fsu.edu eoas-seminar at lists.fsu.edu
Fri Jan 31 16:01:56 EST 2020

Dear all,

Dr. Hector Lamadrid will be visiting us from Feb. 3rd-5th as part of the faculty search for Solid Earth Processes in the Lithosphere (Metamorphic Petrology).

I am attaching the title and abstract of his talk. The talk is scheduled at 3:30 PM on 4th February 2020 (Tuesday) at EOA 1044.

I hope you are able to attend the talk.

Title: Serpentinization and other hydrothermal reactions in crustal environments: Experimental and analytical developments in the study of fluid-rock interactions.

Abstract: The hydrothermal alteration of mantle rocks, commonly known as serpentinization, is a major geological process that has a strong influence on the exchange of mass and energy between the deep Earth and the surface of the planet, affects the rheology and seismic structure of the oceanic lithosphere, and during subduction affects the formation of arc magmatism. Serpentinization encompasses a series of disequilibrium and equilibrium reactions (hydration, dehydration, carbonation, oxidation, etc.) that produces serpentine phases (mainly lizardite and/or chrysotile) ± brucite ± talc ± magnetite ± carbonates ± volatiles like H2 and CH4. The potential of H2 and CH4 to sustain chemoautotrophic microorganisms on early Earth, and the seemingly straight forward correlation to the serpentinization reaction has fueled the interest from the scientific community concerning how the overall process of hydrothermal alteration of ultramafic minerals is linked to the origin of life and the habitability of other planetary bodies (e.g. Mars and the icy moons of Jupiter and Saturn). These far-reaching implications underscore the importance of the quantitative understanding of the influence of physical and chemical conditions on the rates of the serpentinization reaction, and the identification of the geological environments most favorable for serpentinization. Here we show results of a series of ongoing projects studying the kinetics of the hydration, carbonation (CO2 sequestration) and dehydration reactions, aimed to better understand the individual effects that the geological environments (temperature, pressure, fluid chemistry, rock composition, etc.) impose in the overall serpentinization processes, and the future directions of this research. Our results confirm that the fluid composition is one of the most important controlling factors in the serpentinization rates and can set constraints on the mass and energy transfer between different reservoirs. The fluid composition of the hydrothermal system can have important implications on how we model the serpentinization process, especially considering how little we know about the fluid chemistry in several geologic environments where serpentinization and other fluid-rock interactions occur (e.g. subduction zones and the ocean chemistry of other planetary bodies). Moreover, we will show recent successes in the development of new experimental and analytical methodologies that allow us to constrain and control some of the rapidly changing physical and chemical conditions that occur in fluid-rock interactions.

Best wishes
Mainak Mookherjee
Associate Professor
Earth, Ocean and Atmospheric Sciences
Florida State University
Tallahassee, FL, 32310, USA

Phone: (850) 644 1536 (Office)
Email: mmookherjee at fsu.edu<mailto:mmookherjee at fsu.edu>
Email: mainak.mookherjee at gmail.com

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