22 March, 2012 – Seminar
When: 4pm on Thursday, March 22nd, 2012
Where: DIAS, Geophysics Section, 5 Merrion Square, Dublin 2, (library)
Speaker: Ms. Leila Hashim from Institut des Sciences de la Terre d’Orleans
Title: Experimental evidence for crustal melting underneath the Himalayan belt.
Abstract:
Seismic and magnetotelluric field campaigns carried out across the Himalaya and the Tibetan Plateau show widespread low velocity and low resistivity zones. Interpretation of these anomalous readings is still largely debated, either saline fluids or partial melts. Laboratory resistivity measurements on crustal rocks undergoing hydrous partial melting show that the electrical anomalies measured underneath the Himalayan range are best explained by emplacement of pure melt bodies and by partially molten rocks. These results imply a viscosity range of Log Viscosity= 4-12 Pa.s for the middle crust of the Himalaya-Tibetan orogenic system, which is several orders of magnitude lower than previously evaluated. This requires a revision of low-viscosity channel flow models and associated ductile extrusions.
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Last Updated: 22nd March 2016 by Anna
2012-03-22 – Seminar: Ms. Leila Hashim
22 March, 2012 – Seminar
When: 4pm on Thursday, March 22nd, 2012
Where: DIAS, Geophysics Section, 5 Merrion Square, Dublin 2, (library)
Speaker: Ms. Leila Hashim from Institut des Sciences de la Terre d’Orleans
Title: Experimental evidence for crustal melting underneath the Himalayan belt.
Abstract:
Seismic and magnetotelluric field campaigns carried out across the Himalaya and the Tibetan Plateau show widespread low velocity and low resistivity zones. Interpretation of these anomalous readings is still largely debated, either saline fluids or partial melts. Laboratory resistivity measurements on crustal rocks undergoing hydrous partial melting show that the electrical anomalies measured underneath the Himalayan range are best explained by emplacement of pure melt bodies and by partially molten rocks. These results imply a viscosity range of Log Viscosity= 4-12 Pa.s for the middle crust of the Himalaya-Tibetan orogenic system, which is several orders of magnitude lower than previously evaluated. This requires a revision of low-viscosity channel flow models and associated ductile extrusions.
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Big thank you to @MartinaPQuinn of @helloalicepr for moderating the discussion, and of course to our panel @NeasaMcG @CormacORafferty and @laoneill111
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@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"
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@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
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