Home
-
Program
The Goldschmidt2020 program
-
Venue
All about the venue and city
-
Registration
Details of how to register to attend the conference and/or submit an abstract
-
Exhibition
Information for and about exhibitors and sponsors
-
My Goldschmidt
My program, purchases, connections, etc.
Home
-
Dates and Deadlines
Important dates for your diary
-
Site Map
All the web pages on the conference website
-
Mailing List
Add your name to the mailing list
-
Grants
Information about grants
Search
Program
-
Program Day-by-Day
Conference program arranged by day
-
Program by Theme
Conference program arranged by subject
-
Author Index
All authors
-
Program Structure
How the sessions are arranged during the conference
-
Theme 15
Geochemistry and Society
-
Plenaries
The headline talks of the conference
-
Awards
Award talks and ceremonies
-
Keynote talks
All the Keynote talks
-
Committees
Members of the committees organising the conference
Events
-
Early Career Events
Special events for our students and early career scientists
-
Field Trips
Pre and post conference field trips.
-
Meetings
Meetings held at the conference
-
Socials
Events run by the conference
- Sponsor Seminars
-
Training Events
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.
-
Workshops
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.
Locations
-
Conference Locations
Location of the convention center and social events
-
Hotels
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.
Information
- Onsite info
-
Carbon Footprint
Information about steps the conference is making to reduce its environmental impact
Present your work
-
Submit an abstract
Submit an abstrat to the conference
Attend
-
Registration
Register for the conference
-
Dates & deadlines
Important dates
- Mentoring
Information on the montoring program and how to become a mentor or mentee
Exhibition
-
Current Exhibitors
Our wonderful exhibitors
-
Exhibition
Exhibition Info and List of Exhibitors
Sponsorships
-
Current Sponsors
All our amazing sponsors
-
Sponsorship
Sponsorship Info and Current Sponsors
My Goldschmidt
-
Sign In
Sign in to the website
Role functions
Abstract Details
(2020) Eustatic Control on Superheavy δ34S Pyrite Trends from Late Ediacaran-early Cambrian Carbonate Successions of the West Gondwana: Sulfate Distillation Cycles in Shallow Water Platforms?
Caetano-Filho S, Paula-Santos G, Sansjofre P, Cartigny P, Ader M, Guacaneme C, Babisnki M, Kuchenbecker M, Reis H & Trindade R
https://doi.org/10.46427/gold2020.302
The author has not provided any additional details.
14b: Plenary Hall, View in program
Gustavo Paula-Santos View all 3 abstracts at Goldschmidt2020 View abstracts at 6 conferences in series
Pierre Sansjofre View all 4 abstracts at Goldschmidt2020
Pierre Cartigny View all 4 abstracts at Goldschmidt2020 View abstracts at 20 conferences in series
Magali Ader View all 3 abstracts at Goldschmidt2020 View abstracts at 15 conferences in series
Cristian Guacaneme View all 2 abstracts at Goldschmidt2020 View abstracts at 4 conferences in series
Marly Babisnki View all 2 abstracts at Goldschmidt2020
Matheus Kuchenbecker View all 2 abstracts at Goldschmidt2020 View abstracts at 4 conferences in series
Humberto Reis View all 2 abstracts at Goldschmidt2020
Ricardo Trindade 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.
I'm wondering if the environmental hypothesis you propose at the end is testable with the data you have? Are there other predictions the hypothesis would make that might help to verify (or falsify) this hypothesis?
Dear Elizabeth, if you refer to the interpretation of a paleodepositional signature for superheavy pyrites, I think the striking coincidence between the isotope trends coupled to regressive stages in both basins, respecting different sedimentary thicknesses (i.e. sedimentary rates), is a strong evidence for a primary control over superheavy trends. If you concern about the hypothesis of sulfate limitation in these basins controlled by eustatic variation, unfortunately, to obtain constraints over sulfate concentrations in these rocks is a challenge, considering that CAS cannot be used as a direct measurement of primary sulfate availability, especially for these rocks which experienced a long geological evolution. Nevertheless, it is true that we recovered more CAS always from deposits of the transgressive systems tract. I strongly recommend to check two presentations from Cadeau et al. in the session 9c. They studied a potential modern analog for these conditions - the Dziani Dzaka lake, which present very low sulfate concentrations and superhavy pyrite values coupled to equally enriched carbon isotope values in both carbonates and organic carbon. The later condition would be a result of enhanced methanogenesis and methane escape to the atmosphere in this anoxic and sulfate-depleted environment, producing a condition of disequilibria between DIC and atmosphere, driven by 13C-enriched methanogenic CO2 input in the water column. Important to stress that equally enriched d13C values also occur in the Bambuí Group (>+14permil for carbonates and -14 for organic carbon; Caetano-Filho et al., 2020) after the superheavy pyrite trend in the basal sequence. In my opinion this is the best way to test this hypothesis, by comparing with modern analogues.
Thanks for interesting results and interpretation. Would you argue for a case of extreme paleogeography unique from today's oceans that resulted in this variability, low sulfate concentrations in the oceans, or both?
Dear Kimberly, I think both of the options. In this geotectonic setting of the Precambrian-Cambrian transition, large continental masses (supercontinents) implied in different circulation patterns - I do not believe we can consider open ocean circulation even for marginal basins at this time. On the other hand, several geochemical evidences, including sulfur isotope geochemistry, suggest that at this time maybe the Earth's atmosphere was not fully oxigenated. Addiationally, considering continental landmasses free of vegetation would imply in an inefficient transfer of humidity to continental interior and decreased chemical weathering regime which probably could result in lower sulfate income to the basins, compared with modern environments. Thanks for your interest.
Dear Sergio, interesting study! I was wondering what was so unique about these shallow water environments that resulted in this unique composition in otherwise not so unusual depositional environments/processes? Is this related to the specific Neoproterozoic seawater composition or metabolic processes of organisms restricted to this era?
Dear Georgina, thank you for your interest and question. I think the most important in this scenario is the continental assemble of very large masses resulting in restricted circulation patterns and inefficient bottom ventilation within these basins. In a time of probably decreased oxygenation and chemical weathering, sulfate marine reservoir would be probably equally decreased, which would be represented by the higher isotope sulfur variability preceding the Phanerozoic Eon. This scenario allied to restricted basins driven by supercontinent assembly would be more favorable to sulfate exhaustion through microbial sulfate reduction and pyrite burial in stratified water columns. Actually, I am not confortable to say that these data represent Neoproterozoic oceans, maybe we have a bias in the geological record represented by these intracontinental basins and shallow water platforms under inefficient circulation patterns.
Sign in to ask a question.