Abstract Details
(2020) Using δ13Ccarb and δ34S as Indicators of Diagenesis in an Interbedded Shale and Carbonate System
Erhardt A, Tamakloe F & McGlue M
https://doi.org/10.46427/gold2020.670
14b: Plenary Hall, Monday 22nd June 22:33 - 22:36
Andrea Erhardt
Frank Tamakloe
Michael McGlue
Frank Tamakloe
Michael McGlue
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 Magali Ader on Sunday 21st June 15:46
High! no questions, just a comment. I really like this study, thank you! Not so common to see papers that deal in depth with d13C records. Great work. Looking forward to see the developments.
Thanks so much Magali! This is dominantly the work of my MS student Frank Tamakloe, so hopefully we'll have it finished and written up soon.
High! no questions, just a comment. I really like this study, thank you! Not so common to see papers that deal in depth with d13C records. Great work. Looking forward to see the developments.
Thanks so much Magali! This is dominantly the work of my MS student Frank Tamakloe, so hopefully we'll have it finished and written up soon.
Submitted by Kimberly Lau on Monday 22nd June 19:31
Thanks for a very interesting talk, Andrea! I wanted to ask about the carbonate components being analyzed in the BMR-1, BMR-2, and GMR lithofacies (that are presumably not volumetrically dominated by carbonate minerals). Can they be identified as diagenetic cements, transported carbonate skeletal grains, etc.?
Thanks for asking Kim. I didn't include thin section pictures here, but the carbonate appears to be dominantly cements. So, when are these cements forming? The fact that they mirror carbon records from other basins at first glance made us think about glacial cycles, but they must be diagenetic, right? But why is there so much variability, even within a bed? We had started out looking for different permeability zones that would relate the isotopes to fluid flow, but there wasn't any correlation. The big question is can we use these data to tell us more about the formation history, and if they might reflect pore water changes that relate to the overlying seawater. My personal belief is that these diagenetic precipitates can tell us a lot about past environments and pore waters, and I'd like to delve into them more and constrain their formational environments.
Thanks for a very interesting talk, Andrea! I wanted to ask about the carbonate components being analyzed in the BMR-1, BMR-2, and GMR lithofacies (that are presumably not volumetrically dominated by carbonate minerals). Can they be identified as diagenetic cements, transported carbonate skeletal grains, etc.?
Thanks for asking Kim. I didn't include thin section pictures here, but the carbonate appears to be dominantly cements. So, when are these cements forming? The fact that they mirror carbon records from other basins at first glance made us think about glacial cycles, but they must be diagenetic, right? But why is there so much variability, even within a bed? We had started out looking for different permeability zones that would relate the isotopes to fluid flow, but there wasn't any correlation. The big question is can we use these data to tell us more about the formation history, and if they might reflect pore water changes that relate to the overlying seawater. My personal belief is that these diagenetic precipitates can tell us a lot about past environments and pore waters, and I'd like to delve into them more and constrain their formational environments.
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