3 July, 2009 (16:00 GMT), 5 Merrion Square, Dublin 2.
Speaker: David Khoza (DIAS).
Title: Magneto-telluric imaging across a Neoproterozoic collision zone: Damara belt and surrounding cratonic blocks.
Abstract:
The Southern African Magnetotelluric Experiment (SAMTEX) is the largest ever land-based magnetotelluric (MT) project. The main objective of the project is to define the geo-electric structure across the region in order to gain a better understanding of Archean and Proterozoic tectonic processes. The Damara belt in northern Namibia forms part of a highly complex orogenic system that records the closure of an in-land sea and the late Neoproterozoic collisional event between the Congo and Kalahari cratons. This collision event was followed by protracted Pan African (circa 650-550 Ma) tectono-thermal events that included episodic granite emplacements, metamorphism and structural deformation. MT profiles crossing the Rehoboth Terrane, the Neoproterozoic Ghanzi-Chobe/Damara belts (collectively termed the DMB) and the southern Angola craton are the focus of this study. This study is aimed specifically to increase our understanding of the juxtaposition of these tectonic blocks (i.e. Rehoboth Terrane, Angola craton and the DMB) and to infer the nature and geometry of these boundaries at depth. An analysis of structural directions and dimensionality indicates significant depth and lateral variations in geo-electric strike direction and dimensionality on all transects crossing these three tectonic units . Preliminary 2D inversion models indicate lateral variations in the crustal resistivity structure. The approximate boundary of the Damara belt in relation to both the Angola and Rehoboth terranes is evident as a steeply dipping, highly conductive structure and can be correlated with the regional magnetic results.
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Last Updated: 22nd March 2016 by Anna
2009-07-03 – SEMINAR by David Khoza: Magneto-telluric imaging across a Neoproterozoic collision zone: Damara belt and surrounding cratonic blocks
3 July, 2009 (16:00 GMT), 5 Merrion Square, Dublin 2.
Speaker: David Khoza (DIAS).
Title: Magneto-telluric imaging across a Neoproterozoic collision zone: Damara belt and surrounding cratonic blocks.
Abstract:
The Southern African Magnetotelluric Experiment (SAMTEX) is the largest ever land-based magnetotelluric (MT) project. The main objective of the project is to define the geo-electric structure across the region in order to gain a better understanding of Archean and Proterozoic tectonic processes. The Damara belt in northern Namibia forms part of a highly complex orogenic system that records the closure of an in-land sea and the late Neoproterozoic collisional event between the Congo and Kalahari cratons. This collision event was followed by protracted Pan African (circa 650-550 Ma) tectono-thermal events that included episodic granite emplacements, metamorphism and structural deformation. MT profiles crossing the Rehoboth Terrane, the Neoproterozoic Ghanzi-Chobe/Damara belts (collectively termed the DMB) and the southern Angola craton are the focus of this study. This study is aimed specifically to increase our understanding of the juxtaposition of these tectonic blocks (i.e. Rehoboth Terrane, Angola craton and the DMB) and to infer the nature and geometry of these boundaries at depth. An analysis of structural directions and dimensionality indicates significant depth and lateral variations in geo-electric strike direction and dimensionality on all transects crossing these three tectonic units . Preliminary 2D inversion models indicate lateral variations in the crustal resistivity structure. The approximate boundary of the Damara belt in relation to both the Angola and Rehoboth terranes is evident as a steeply dipping, highly conductive structure and can be correlated with the regional magnetic results.
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