Abstract Details
(2020) Crystal Structure of Dolomites Recrystallized at Low vs. High Water to Rock Ratios
Lukoczki G, Sarin P, Gregg J & John C
https://doi.org/10.46427/gold2020.1651
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14b: Plenary Hall, Monday 22nd June 22:15 - 22:18
Georgina Lukoczki
View abstracts at 2 conferences in series
Pankaj Sarin View abstracts at 2 conferences in series
Jay Gregg View abstracts at 3 conferences in series
Cédric John View all 2 abstracts at Goldschmidt2020 View abstracts at 4 conferences in series
Pankaj Sarin View abstracts at 2 conferences in series
Jay Gregg View abstracts at 3 conferences in series
Cédric John View all 2 abstracts at Goldschmidt2020 View abstracts at 4 conferences in series
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 Kimberly Lau on Friday 19th June 19:16
Why are the fluid-buffered fields in the plots smaller and more limited in range than for the rock-buffered fields? Is this because of the smaller number of samples or do you think this is representative of the different regimes?
At this point the reason is the small number of samples (2). It is promising that the two samples always plot very close to each other, so I think that they likely represent the differences in processes/regimes but I certainly expect to have at least somewhat larger spread if we had more data.
Why are the fluid-buffered fields in the plots smaller and more limited in range than for the rock-buffered fields? Is this because of the smaller number of samples or do you think this is representative of the different regimes?
At this point the reason is the small number of samples (2). It is promising that the two samples always plot very close to each other, so I think that they likely represent the differences in processes/regimes but I certainly expect to have at least somewhat larger spread if we had more data.
Submitted by Vanessa Fichtner on Friday 19th June 19:20
Do you think it is possible that the finer crystalline dolomites are finer because of different growth kinetics? Do they have a different trace metal content?
The initial finer crystal size is likely related to the availability of nucleation sites and the degree of supersaturation of the fluid from which they formed with respect to dolomite and potentially to mass transfer rates. The trace element content of these dolomites is low and I did not observe any significant trends.
Do you think it is possible that the finer crystalline dolomites are finer because of different growth kinetics? Do they have a different trace metal content?
The initial finer crystal size is likely related to the availability of nucleation sites and the degree of supersaturation of the fluid from which they formed with respect to dolomite and potentially to mass transfer rates. The trace element content of these dolomites is low and I did not observe any significant trends.
Submitted by Mario Goncalves on Monday 22nd June 13:32
How did you control your sampling as being either rock-buffered or fluid-buffered? I did not quite understood if that was, for example, related to depth of burial. Thanks
I identified whether these dolomites were recrystallized with low vs. high fluid to rock ratios based on isotope data, especially clumped isotope data, using the calculated fluid compositions, together with textural observations. The fluid-buffered recrystallization was likely fault-controlled and these dolomites have textures that are fairly easy to distinguish from the rock-buffered samples in this study area.
How did you control your sampling as being either rock-buffered or fluid-buffered? I did not quite understood if that was, for example, related to depth of burial. Thanks
I identified whether these dolomites were recrystallized with low vs. high fluid to rock ratios based on isotope data, especially clumped isotope data, using the calculated fluid compositions, together with textural observations. The fluid-buffered recrystallization was likely fault-controlled and these dolomites have textures that are fairly easy to distinguish from the rock-buffered samples in this study area.
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