Stable Sulfur Isotopes & Paleoclimate / Paleobiology Proxies | GEO GIRL

Описание: Stable sulfur isotope basics (list of S isotopes, emphasizing sulfur 34 and 32 which are most often used for S isotope ratios, the equation explaining permil notation, rocks used for measuring sulfur isotopes- pyrite, barite, gypsum, carbonate), the use of sulfur isotopes as paleo-proxies, biogenic sulfur isotope fractionation by sulfate reducing bacteria, the difference between isotopic composition and offset (δ vs. Δ), as well as mass-dependent and independent fractionation (MDF vs. MIF)- MIF before the great oxidation event explained.

References: Stable isotopes textbook I use: https://amzn.to/3gNITj8
https://doi.org/10.1002/anie.201812322
https://doi.org/10.2475/ajs.299.7-9.697
https://doi.org/10.1002/ange.201915196

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0:00 What stable sulfur isotopes exist?
1:18 Sulfur isotope notation /calculating stable isotope ratios
3:06 Common sulfur containing rocks
4:24 Sulfide biosynthesis
5:43 S isotope fractionation during bacterial sulfide production
7:25 S isotopes as an early life on Earth proxy
10:17 Calculating S isotope offset
12:17 Mass independent fractionation vs. mass dependent fractionation
13:17 What caused mass independent S isotope fractionation?
14:57 Recap of 2 major S isotope uses

Image sources:
https://csmsgeologypost.blogspot.com/...
https://www.geos.ed.ac.uk/geosciences...
https://www.proprofs.com/quiz-school/...
https://studiousguy.com/sulfur-uses/
https://raggedrobinsnaturenotes.blogs...
http://www.geologycafe.com/class/chap...
http://flynt.pbworks.com/w/page/91985...
http://geology.com/minerals/barite.shtml
https://doi.org/10.1002/ange.201915196
https://www.researchgate.net/figure/T...
http://all-geo.org/highlyallochthonou...

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