Abstract Details
(2020) Rheology and Thermal Structure of the Lithosphere beneath the Hawaiian Ridge Inferred from Gravity Data and Models of Plate Flexure
Pleus A, Ito G, Wessel P & Neil F
https://doi.org/10.46427/gold2020.2094
The author has not provided any additional details.
05h: Room 2, Saturday 27th June 06:21 - 06:24
Alexandra Pleus
Garrett Ito View all 4 abstracts at Goldschmidt2020 View abstracts at 7 conferences in series
Paul Wessel View all 3 abstracts at Goldschmidt2020
Frazer Neil
Garrett Ito View all 4 abstracts at Goldschmidt2020 View abstracts at 7 conferences in series
Paul Wessel View all 3 abstracts at Goldschmidt2020
Frazer Neil
Listed below are questions that have been submitted by the community that the author will try and cover in their presentation. To submit a question, ensure you are signed in to the website. Authors or session conveners approve questions before they are displayed here.
Submitted by Keith Putirka on Wednesday 24th June 22:55
Hi Garrett - this question is for both you, and your colleague who is working on the xenoliths. The 300 deg. C heating is close to what has been calculated for the excess T of the plume itself. Is that just a coincidence? It would seem that the excess T of the plume itself would yield a maximum heating for the lithosphere, for the convective case at least, and only if all of it's excess heat is transferred. But perhaps local inputs of magma could lead to greater (or lesser) heating and so have no simple relationship to plume excess temperature. Or perhaps I misunderstand how the heating works. -Keith
Hi Garrett - this question is for both you, and your colleague who is working on the xenoliths. The 300 deg. C heating is close to what has been calculated for the excess T of the plume itself. Is that just a coincidence? It would seem that the excess T of the plume itself would yield a maximum heating for the lithosphere, for the convective case at least, and only if all of it's excess heat is transferred. But perhaps local inputs of magma could lead to greater (or lesser) heating and so have no simple relationship to plume excess temperature. Or perhaps I misunderstand how the heating works. -Keith
Submitted by Garrett Ito on Friday 26th June 17:07
Hi Keith. Coincidence... I think. Thinking in terms of magmatic heating...yes, I think the absolute temperature of the plume would set the upper limit for the absolute temperature of the magma produced and hence the utmost maximum temperature to which that magma could heat the lithosphere. The (normal) lithosphere spans a wide range of temperatures (from near zero at the surface to ~1000 deg C--i.e., the temperature that defines its base), hence the possible excess represented by the magma spans a comparable range. Your question pertains to whether there is a process that links the plume-ambient-asthenosphere temperature contrast to the magma-ambient-lithosphere contrast at the point in the lithosphere where those xenoliths were emplaced. I cannot think of one, but if you can I am all ears.
Hi Keith. Coincidence... I think. Thinking in terms of magmatic heating...yes, I think the absolute temperature of the plume would set the upper limit for the absolute temperature of the magma produced and hence the utmost maximum temperature to which that magma could heat the lithosphere. The (normal) lithosphere spans a wide range of temperatures (from near zero at the surface to ~1000 deg C--i.e., the temperature that defines its base), hence the possible excess represented by the magma spans a comparable range. Your question pertains to whether there is a process that links the plume-ambient-asthenosphere temperature contrast to the magma-ambient-lithosphere contrast at the point in the lithosphere where those xenoliths were emplaced. I cannot think of one, but if you can I am all ears.
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