[Eoas-seminar] No EOAS colloquium Fri Feb 7

[eoas-seminar at lists.fsu.edu]

Because there is a candidate seminar on Tues, there will be no EOAS 
colloquium talk on Fri Feb 7.  Please join us instead for the candidate 
seminar on Tues., announcement below:



-------- Forwarded Message --------
Subject: 	[Eoas-seminar] Tuesday Feb 4th Faculty Candidate for Solid 
Earth Processes in the Lithosphere (Hector Manadrid)
Date: 	Fri, 31 Jan 2020 21:01:56 +0000
From: 	eoas-seminar--- via Eoas-seminar <eoas-seminar at lists.fsu.edu>
Reply-To: 	eoas-seminar at lists.fsu.edu
To: 	eoas-seminar at lists.fsu.edu <eoas-seminar at lists.fsu.edu>



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 H_2  and CH_4 . The potential of H_2  and CH_4 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 (CO_2  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
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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
URL:http://myweb.fsu.edu/mmookherjee
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