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Abstract Details

(2020) Volatile Elements in Chondrites

Braukmüller N, Funk C, Münker C & Wombacher F

https://doi.org/10.46427/gold2020.256

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01c: Room 1, Tuesday 23rd June 00:45 - 00:48

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 My Riebe on Sunday 21st June 19:11
Do you think that the enstatite chondrites accreted a different kind of matrix than other chondrites or that the subsequent processing was different?
Based on the fact that presolar grains have been detected in enstatite chondrites I think that enstatite chondrites do contain a primitive matrix component similar to CC, RC and OC. However, the volatile element abundances and fractionations are clearly not controlled by this component as is the case for carbonaceous chondrites and partly ordinary and Rumuruti chondrites. So I think the bulk data cannot really help here to decipher these two possibilities.

Submitted by Aki Takigawa on Monday 22nd June 11:26
What is the typical reservoir of the volatile element in E chondrite? Are the volatile elements in matrices of E chondrites much more abundant than those in CI chondrite?
I think this cannot be answered with the bulk data I presented. One would need dedicated analyses of volatile element abundances in EC chondrules and matrix.

Submitted by Sheryl Singerling on Monday 22nd June 22:50
Why do the OCs, which experienced higher T's than the CMs for example, have higher volatile contents? Were they just initially higher rather than it being related to retention of volatiles?
In general volatile element abundances in OC are lower than in CM chondrites. Only In, Cd and Tl are sometimes much higher and even enriched relative to CI chondrites. The heterogeneous enrichments and depletions of these three elements that we observe in OC indicate that they were redistributed on the OC parent body during open system thermal metamorphism. I would assume that initial CI normalized Cd, In and Tl abundances in OC are similar to CI normalized Zn, Sn and Te abundances. Later, parts of the parent bodies heated up which led to the volatilization of Cd, In and Tl. In colder parts they can then recondense, resulting in the heterogeneous abundances that we observe now in the different samples. For more information see also e.g., Wombacher et al. (2008).

Submitted by Kun Wang on Tuesday 23rd June 01:03
How do you commend on the matrix-chondrule complementary relationship?


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