Abstract Details
(2020) The Impact of Early Earth Differentiation on the Modern World
Carlson R
https://doi.org/10.46427/gold2020.324
The author has not provided any additional details.
02c: Room 1, Tuesday 23rd June 22:00 - 22:03
Richard W. Carlson
View all 4 abstracts at Goldschmidt2020
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Submitted by Kent Condie on Wednesday 17th June 00:36
From Kent Condie: It has always puzzled me why Archean greenstone basalts show a depleted mantle signature back to 4 Ga, I think your study gives the probably answer to this question
Thanks Kent. The one thing the short lived isotope systems make clear is that Earth's interior was already differentiated by ~4.3 Ga. What caused it to differentiate is a good question. I think it could be in response to a 4.36 Ga impact that formed the Moon and left Earth with a mafic primordial crust with the complimentary slightly depleted mantle (EDM on my last slide). Most of that crust was recycled and replaced by new oceanic-like crust, but a small amount was reprocessed into some of the sections of Eoarchean felsic crust that still remain. The two talks by Hyung and Jacobsen and the EPSL paper by Rosas and Korenaga present different views about what that early crust might have been.
From Kent Condie: It has always puzzled me why Archean greenstone basalts show a depleted mantle signature back to 4 Ga, I think your study gives the probably answer to this question
Thanks Kent. The one thing the short lived isotope systems make clear is that Earth's interior was already differentiated by ~4.3 Ga. What caused it to differentiate is a good question. I think it could be in response to a 4.36 Ga impact that formed the Moon and left Earth with a mafic primordial crust with the complimentary slightly depleted mantle (EDM on my last slide). Most of that crust was recycled and replaced by new oceanic-like crust, but a small amount was reprocessed into some of the sections of Eoarchean felsic crust that still remain. The two talks by Hyung and Jacobsen and the EPSL paper by Rosas and Korenaga present different views about what that early crust might have been.
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