Abstract Details
(2020) An Isotopically Depleted, Rejuvenated Stage Source Component Widely Distributed in the Hawaiian Plume
Frey F, Huang S, Xu G, DeFelice C & Del Toro Contreras C
https://doi.org/10.46427/gold2020.748
The author has not provided any additional details.
05h: Room 2, Saturday 27th June 05:48 - 05:51
Frederick Frey
View all 2 abstracts at Goldschmidt2020
View abstracts at 10 conferences in series
Shichun Huang View all 5 abstracts at Goldschmidt2020
Guangping Xu View all 3 abstracts at Goldschmidt2020
Christopher DeFelice View all 2 abstracts at Goldschmidt2020 View abstracts at 3 conferences in series
Clarisa Del Toro Contreras
Shichun Huang View all 5 abstracts at Goldschmidt2020
Guangping Xu View all 3 abstracts at Goldschmidt2020
Christopher DeFelice View all 2 abstracts at Goldschmidt2020 View abstracts at 3 conferences in series
Clarisa Del Toro Contreras
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 19:48
Hi Fred - Do you think the high CaO in the transition zone-derived lavas is connected to the source, perhaps the carbonated component? And do you have any thoughts as to how these components become concentrated if the plume is more or less always coming through the transition zone (accepting that the Hawaiian plume is rooted in the lower mantle/CMB)? -Keith
Hi Keith, Thank you for the questions. Here are my responses: First question: yes, we think the source of the HIMU-type diamond inclusion is carbonated MORB, which melts at the top of the transition zone. The melt from which the diamond inclusion crystallized is probably carbonatite melt or carbonated melt. Our observed mineral assemblage in the diamond inclusion matches that obtained from high P-T experiments of carbonate MORB. Second question: In the Bercovici & Karato model, because of the high water-solubility in the transition zone, they propose a water-rich layer right at the 410 km boundary. It turns out that carbonated MORB also melts near the 410 km boundary (e.g., Thompson et al., 2016). It is possible that there is a melt-volatile-incompatible element-rich layer at 410 km. When mantle plumes from the lower mantle penetrate the transition zone, they will sample this layer. In this case, the transition zone derived components do not dominate these deep mantle plumes. On the other hand, this layer can be very rick in K-Th-U, as shown in our diamond inclusion data. With time, it is possible to produce enough heat to initiate mantle plumes from the top of transition zone. In this case, you expected to have a mantle plume that is dominated by transition zone derived components. In fact, transition zone originated mantle plumes have already been proposed by others. I hope I answered your questions. Thank you! Shichun
Hi Fred - Do you think the high CaO in the transition zone-derived lavas is connected to the source, perhaps the carbonated component? And do you have any thoughts as to how these components become concentrated if the plume is more or less always coming through the transition zone (accepting that the Hawaiian plume is rooted in the lower mantle/CMB)? -Keith
Hi Keith, Thank you for the questions. Here are my responses: First question: yes, we think the source of the HIMU-type diamond inclusion is carbonated MORB, which melts at the top of the transition zone. The melt from which the diamond inclusion crystallized is probably carbonatite melt or carbonated melt. Our observed mineral assemblage in the diamond inclusion matches that obtained from high P-T experiments of carbonate MORB. Second question: In the Bercovici & Karato model, because of the high water-solubility in the transition zone, they propose a water-rich layer right at the 410 km boundary. It turns out that carbonated MORB also melts near the 410 km boundary (e.g., Thompson et al., 2016). It is possible that there is a melt-volatile-incompatible element-rich layer at 410 km. When mantle plumes from the lower mantle penetrate the transition zone, they will sample this layer. In this case, the transition zone derived components do not dominate these deep mantle plumes. On the other hand, this layer can be very rick in K-Th-U, as shown in our diamond inclusion data. With time, it is possible to produce enough heat to initiate mantle plumes from the top of transition zone. In this case, you expected to have a mantle plume that is dominated by transition zone derived components. In fact, transition zone originated mantle plumes have already been proposed by others. I hope I answered your questions. Thank you! Shichun
Submitted by Dominique Weis on Friday 26th June 19:23
Hello Fred/Shichun, What is the composition of Caltech sample ON-ZiZ74a? which volcano is it coming from? Thanks, Dominique (Weis, with one s please).
Thank you, Dominique, for the question! ON-ZiZ74a is a diamond with unknown provenance. We looked at one silicate inclusion inside this diamond. Shichun
Hello Fred/Shichun, What is the composition of Caltech sample ON-ZiZ74a? which volcano is it coming from? Thanks, Dominique (Weis, with one s please).
Thank you, Dominique, for the question! ON-ZiZ74a is a diamond with unknown provenance. We looked at one silicate inclusion inside this diamond. Shichun
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