21 March, 2012 – Seminar
When: 4pm on Wednesday, March 21st, 2012
Where: DIAS, Geophysics Section, 5 Merrion Square, Dublin 2, (library)
Speaker: Dr. Fabrice Gaillard from Institut des Sciences de la Terre d’Orleans
Title: Partial melting and electrical conductivity of the mantle.
Abstract:
The identification of highly conductive regions in the Earth’s mantle has long been intriguing for the Geosciences community because peridotite rocks are not conductive. Supplementary materials must be added to ordinary peridotite in order to make the mantle conductive and mineral physicists, petrologists, geochemists and geophysicists have different point of views concerning the nature of this conductive component. A long standing interpretation has been water and its incorporation as impurities in mantle minerals such as olivine. The possibility of correlating high conductivity with high mantle water content has considerably impacted the scientific literature but disappointingly, most recent experimental constraints refute this elegant model. The ancient petrological model of mantle melting has recently been re-adopted with, as added value, the role of volatiles (H-C-Cl-F) on mantle melting. Several points will be tackled in this talk. Can volatiles allow mantle melting in the entire upper (and lower) mantle? What sort of melts is then produced? How they may deviate from the standard basaltic compositions? What is their impact on mantle conductivity? Can we recognize these melts in electromagnetic images of mantle conductivity? Can we then correlate electrical heterogeneity to chemical heterogeneities, ie. volatiles, redox,… ? Inbrief, can we reconcile the petrological mantle with the electrical mantle?
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Last Updated: 22nd March 2016 by Anna
2012-03-21 – Seminar: Dr. Fabrice Gaillard
21 March, 2012 – Seminar
When: 4pm on Wednesday, March 21st, 2012
Where: DIAS, Geophysics Section, 5 Merrion Square, Dublin 2, (library)
Speaker: Dr. Fabrice Gaillard from Institut des Sciences de la Terre d’Orleans
Title: Partial melting and electrical conductivity of the mantle.
Abstract:
The identification of highly conductive regions in the Earth’s mantle has long been intriguing for the Geosciences community because peridotite rocks are not conductive. Supplementary materials must be added to ordinary peridotite in order to make the mantle conductive and mineral physicists, petrologists, geochemists and geophysicists have different point of views concerning the nature of this conductive component. A long standing interpretation has been water and its incorporation as impurities in mantle minerals such as olivine. The possibility of correlating high conductivity with high mantle water content has considerably impacted the scientific literature but disappointingly, most recent experimental constraints refute this elegant model. The ancient petrological model of mantle melting has recently been re-adopted with, as added value, the role of volatiles (H-C-Cl-F) on mantle melting. Several points will be tackled in this talk. Can volatiles allow mantle melting in the entire upper (and lower) mantle? What sort of melts is then produced? How they may deviate from the standard basaltic compositions? What is their impact on mantle conductivity? Can we recognize these melts in electromagnetic images of mantle conductivity? Can we then correlate electrical heterogeneity to chemical heterogeneities, ie. volatiles, redox,… ? Inbrief, can we reconcile the petrological mantle with the electrical mantle?
Category: Geophysics Section News & Events
Big thank you to @MartinaPQuinn of @helloalicepr for moderating the discussion, and of course to our panel @NeasaMcG @CormacORafferty and @laoneill111
@CormacORafferty "to cut yourself off from fundamental research means you could miss out on some of the biggest ideas"
@laoneill "it's our job as researchers to keep reminding governments how important basic research is" "For Dev basic research being carried out in Ireland was a badge of pride"
@NeasaMcG Schrödinger's work in causality was not well received by the religious authorities at the time At the same time DIAS did have Catholic priests working on research projects in the early days, so there was not the conflict you might think between science and religion
@laoneill111 Schrödinger was very popular in social circles in Dublin, a bit of a renaissance man
@CormacORafferty Schrödinger was gifted at explaining difficult concepts
@CormacORafferty on how unsuccessful work, in Schrödinger's case, unified field theory, is just as important part of science. And no one has managed to crack it yet! And not forgetting the cat
@laoneill111 how Schrödinger's book inspired scientists to change fields and result in the finding of the double helix.
@NeasaMcG explaining how DIAS came about and how Schrödinger was attracted to Ireland #DIASdiscovers
Panel Discussion getting underway! @laoneill111 @CormacORafferty @NeasaMcG @MartinaPQuinn
We're half way through the documentary... Join us for the rest and the fascinating discussion to follow DM for link
@Stella15882 @NeasaMcG @HistFest @lukeoneil47 @CormacORafferty @MartinaPQuinn Stella, send me an email. I'll get a link to you communications@dias.ie
Starting in just over an hour we have limited tickets left for tonights broadcast and panel discussion. Get your free ticket now twitter.com/DIAS_Dublin/st…
Culture Night 2020 Booking Links! - Virtual Tour of DIAS Dunsink Observatory: eventbrite.ie/e/118043576515 - Earthquakes and other Geohazards: eventbrite.ie/e/earthquakes-… - Taifeadaí Cartlainne ó Scoil an Léinn Cheiltigh: eventbrite.ie/e/taifeadai-ca… Join us from 5pm! #CultureNight2020
@dias_geophysics have developed something special for @galway2020 in collaboration with composer David Stalling. It is an audio-visual composition “Palace of Ships,” based on sounds, images and seismic data from DIAS’ @SEA_SEIS Expeditions. More: dias.ie/2020/09/14/dia…
Meet some of our panelists for tomorrows discussion on the impact and legacy of the work carried out by Erwin Schroedinger during his time in Ireland as our first Director of Theoretical Physics Grab a free ticket here: eventbrite.ie/e/115984908985