13 June, 2008 (16:00 GMT), 5 Merrion Square, Dublin 2.
Speaker: John O’Conner (VU University Amsterdam)
Title: Testing a new hotspot-plume model for the Hawaiian-Emperor Chain.
Abstract:
Although fixed hotspots and mantle plumes have been fundamental hypotheses in marine geosciences for more than 30 years, both are now being widely disputed. Whether or not mantle plumes form hotspots and their associated volcanic trails, the fixity of such mantle upwellings, and the depth(s) and composition(s) of their sources are of pivotal importance for geodynamic models of the mantle and the motions of tectonic plates. Volcanic propagation along seamount chains, most notably the archetypal Hawaiian-Emperor Chain with its Great Bend, is the key observation underpinning the notion that tectonic plates drift over fixed hotspots/plumes. But, we are proposing a different model for the Hawaiian-Emperor Chain on the basis of isotopic ages for new volcano samples and information about mantle flow inferred from diverse geophysical sources. I will talk about our new model for the Hawaiian-Emperor Chain and projects planned for testing its validity on a significantly more global scale. Understanding what these new data might mean will continue to depend critically on inferring fundamental information about the mantle from tomography, numerical modeling, plate reconstructions and possibly also the timing of major global environmental and biotic changes.
Leave a Comment
Last Updated: 22nd March 2016 by Anna
2008-06-13 – SEMINAR by John O’Conner: Testing a new hotspot-plume model for the Hawaiian-Emperor Chain
13 June, 2008 (16:00 GMT), 5 Merrion Square, Dublin 2.
Speaker: John O’Conner (VU University Amsterdam)
Title: Testing a new hotspot-plume model for the Hawaiian-Emperor Chain.
Abstract:
Although fixed hotspots and mantle plumes have been fundamental hypotheses in marine geosciences for more than 30 years, both are now being widely disputed. Whether or not mantle plumes form hotspots and their associated volcanic trails, the fixity of such mantle upwellings, and the depth(s) and composition(s) of their sources are of pivotal importance for geodynamic models of the mantle and the motions of tectonic plates. Volcanic propagation along seamount chains, most notably the archetypal Hawaiian-Emperor Chain with its Great Bend, is the key observation underpinning the notion that tectonic plates drift over fixed hotspots/plumes. But, we are proposing a different model for the Hawaiian-Emperor Chain on the basis of isotopic ages for new volcano samples and information about mantle flow inferred from diverse geophysical sources. I will talk about our new model for the Hawaiian-Emperor Chain and projects planned for testing its validity on a significantly more global scale. Understanding what these new data might mean will continue to depend critically on inferring fundamental information about the mantle from tomography, numerical modeling, plate reconstructions and possibly also the timing of major global environmental and biotic changes.
Category: Geophysics Section News & Events
Meet the Judges of our "Reach for the Stars" Astrophotography competition! Brenda Fitzsimons is photo editor of the @IrishTimes. To learn more about the competition and submit an entry see dias.ie/reachforthesta… #DIASdiscovers #astrophotography
Nice work 👏 twitter.com/dias_geophysic…
Following on from our post, highlighting inspiring #WomeninResearch and encouraging #MondayMotiviation to explore these subjects. @ChantalKobel presents Celticist, Nessa Ní Shéaghdha and her contributions to the discipline youtu.be/LGPLltjTBKw #DIASdiscovers
We have entered the last month to capture that amazing photo of the sky and win our Astrophotography competition. We are accepting photographs taken between 01 January 2020 and 31 March 2021. You can submit an entry up to Friday 02nd April 2021. More: dias.ie/reachforthesta…
Meet the Judges of our "Reach for the Stars" Astrophotography competition! @petertgallagher is Head of @DIASAstronomy & has spent the past two decades studying the Sun its impacts on the Earth. To learn more and submit an entry see dias.ie/reachforthesta… #DIASdiscovers
She has over 15 years’ experience working in PR and communications and has wide-ranging experience of providing strategic communications support to organisations. Learn more about the competition and submit an entry 👉dias.ie/reachforthesta… #DIASdiscovers #astrophotography
Meet the Judges of our "Reach for the Stars" Astrophotography competition! @MartinaPQuinn is the Founder & Managing Director of @helloalicepr.
Want to learn more about what's happening on Mars? Check out our public lecture from November delivered Dr John Clinton and titled MarsQuakes! (5/5) youtu.be/_Lp0oLJ8Ahs
And then this Thursday @NASAMars Perseverance rover reaches Mars, which will try to land in a near equatorial crater called Jezero. Here you can see a possible route around the crater. (4/5)