The Goldschmidt2020 program
All about the venue and city
Details of how to register to attend the conference and/or submit an abstract
Information for and about exhibitors and sponsors
My program, purchases, connections, etc.
Dates and Deadlines
Important dates for your diary
All the web pages on the conference website
Add your name to the mailing list
Information about grants
Conference program arranged by day
Program by Theme
Conference program arranged by subject
How the sessions are arranged during the conference
Geochemistry and Society
The headline talks of the conference
Award talks and ceremonies
All the Keynote talks
Members of the committees organising the conference
Early Career Events
Special events for our students and early career scientists
Pre and post conference field trips.
Meetings held at the conference
Events run by the conference
- Sponsor Seminars
These are scheduled events to help delegates test out the tools and platform we will be using for the Q&A and other events at the conference.
Our workshop program provides training and teaching in topics across geochemistry and related fields. We are currently liaising with the workshop organisers to ascertain if any workshops can become virtual. Any updates will be added to this page.
Location of the convention center and social events
The hotels are no longer available to book at the special rates agreed by the conference. Should you wish to cancel or change your hotel reservation please see the details below.
Social Event Locations
These are locations for the conference social events.
- Onsite info
Information about steps the conference is making to reduce its environmental impact
Present your work
Submit an abstract
Submit an abstrat to the conference
Register for the conference
Dates & deadlines
Information on the montoring program and how to become a mentor or mentee
Our wonderful exhibitors
Exhibition Info and List of Exhibitors
All our amazing sponsors
Sponsorship Info and Current Sponsors
(2020) Heterogeneous Nucleosynthetic 84Sr Anomalies within and Among CAIs
Di Y & Amelin Y
The author has not provided any additional details.
01g: Room 1, View in program
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.
Could you comment mineral phases related to leachates and residues? SJ101 is one of least melted FoB CAIs, according to Bullock et al. 2012 (MaPS 47, 2128–2147) that show relatively smaller grain sizes. Is it a problem for homogenization of 84Sr by melting?
The fraction we used for leaching experiment was a mixture of phases. Since the majority of Sr was released in the leachates, we suspect that the phases dissolved in the leachates are the Sr-rich soluble minerals i.e. mellilite and anothosite. The residue may consist of other acid-resist and low-Sr phases, like pyroxene, forstrite and spinel. Indeed, this CAI only experienced small degree partial melting. It is possible that the precursor of this CAI initially formed in a well-mixed reservoir with homogenized Sr isotopes.
Hi, on Slide 8, it looks like the data for CAI 3529-21 are not resolved relative to the grey 'Earth' bar. Can you comment this, and the implications for your conclusion of a deficit in u84Sr in some non-FUN CAIs?
Hi, thank you for pointing out this! As shown in that figure, we measured two fractions from this CAI: one finer-grained fraction yielded -80 +/- 72 ppm, and one coarser-grained fraction yielded -52 +/- 18 ppm. Our result for 33 analyses of terrestrial rock standards is -31 +/- 8 ppm. The finer-grained fraction has too large uncertainty due to small sample size, but the mu84Sr of the coarser-grained fraction is lower than the Earth by 21 +/- 20 ppm. This difference is indeed minor and is only marginally resolved from 0. There is also some debate on the true mu84Sr of the Earth. However, it is still true that this CAI has the lowest mu84Sr seen in normal CAIs, and the mu84Sr of normal CAIs cover a range from about -50 to +300 ppm. Our current conclusion may be better expressed "some non-FUN CAI may have 84Sr composition close to, or slightly depleted relative to the Earth".
Very nice presentation! Do you have any thoughts on what the carrier phase may be in CAI 3529-49 that has the anomalous L1 leachate for 84Sr?
Thank you! We are currently not sure. The majority of Sr is released in that leachate, so the anomaly may reflect the existence of small amount of extreme p-/r- isotope carrier SN (or processed) grains; Charlier et al. (2019, GCA) also mentioned a nugget effect of 84Sr in CAIs. However how they survived the high-T condensation might be a problem. Another explanation is the Sr isotope heterogeneity of the CAI gas reservoirs. Probably, a large proportion of the soluble phases (and also Sr-enriched phases), like melilite, condensed from a domain with higher mu84Sr while the more refractory and resist phases mainly come from another gasous region.
Sign in to ask a question.