#diagenesis

2024-08-09

#WeekendReading: Akhtar et al. show a multi-element/isotopes approach to explore the differences in early #diagenesis of #carbonates with marine and meteoric fluids, as well as along the gradient.
(In the Bahamas and Great Barrier #Reef)

doi.org/10.1016/j.gca.2024.08.

2024-06-14

#WeekendReading: Catching up on Wei and Zhang's thoughts on shallow-water #carbonate early #diagenesis. I think I'd like to play again at some point with this idea of diagenesis based correlation.
sciencedirect.com/science/arti

Emilia Jarochowska πŸ‡ΊπŸ‡¦πŸŒ±Emiliagnathus@circumstances.run
2024-04-17

We've been working on a massive riddle tying together #self-organization, #carbonate #diagenesis, reactive transport, #paleoclimate and #Milankovich cycles, and very stiff PDE systems.

If you've missed the poster at #egu24, you can still find it attached to the abstract in the conference program (meetingorganizer.copernicus.or) and on Zenodo zenodo.org/records/10943274 If you're into numerical methods, tricky PDEs or other aspects of #modeling, please see if you have any advice to us πŸ˜„ #solvers #PDE

Plot showing an oscillating concentrations of calcite as a function of time. This is a numerical solution of a dynamical system formulated by Ivan L'Heureux (2018) describing self-organization in carbonate sediment, which results in emergent patterns that can be confused with Milankovich periodicity,
John Faithfull 🌍πŸ‡ͺπŸ‡ΊπŸ΄σ §σ ’σ ³σ £σ ΄σ ΏπŸ§‘βœŠπŸ»βœŠπŸΏFaithfullJohn@mastodon.scot
2024-03-03

@Ruth_Mottram Concretions like this are wonderful 😊 . They preserve 3D fossils because they grow before the burial that might crush the fragile remains. I did this wee graphic for some similar ones (but which also show later "septarian" cracking). Your Whitby one grew like this, but for some reason, did not crack - maybe more complete mineralisation of bacterial slimeball? #Geology #Septarian #Diagenesis

A cartoon graphic showing How Septarian Concretions Form 
Muddy seafloor: thin soupy mud at top,o more solid mud lower down
Bacterian grow around rotting organic material 

Close up view 

Jelly-like bacterial lump with carbonate minerals, growing within mud, about 30-50cm down. 

Rigid crust of carbonate minerals forms O around jelly/carbonate core. 

Bacterial jelly lump breaks down, shrinks, and cracks inside rigid crust l l With burial, soft mud layers (and any fossils in b them) get compacted and squashed. Inside the rigid concretion, layers and fossils retain original thicknesses/shapes. 
Septarian cracks usually filled by later minerals.
2023-12-15

#WeekendReading: Monedero-Contreras et al. discuss why they think #sapropels initiated and terminated abruptly, how #diagenesis complicated detecting the termination and what it might mean for other oxygen depletion events.
doi.org/10.1016/j.palaeo.2023.

2023-05-28

I think that at this point we established the #Bahamas is an anomaly - can we stop use it as a benchmark to explain #carbonate depositional environments and #diagenesis?

Emilia Jarochowska πŸ‡ΊπŸ‡¦πŸŒ±Emiliagnathus@circumstances.run
2023-02-27

Interested in marine mammals?
Apply for the PhD position on Conservation paleobiology of toothed whales of the North Atlantic (4 years) with me and Lonneke IJsseldijk at Utrecht University: uu.nl/en/organisation/working- #conservation #PhD #MarineBiology #palaeobiology #palaeontology #VeterinaryScience #teeth #diagenesis

Dead harbour porpoise with net marks from being caught in a fishing net (courtesy of Jan Haelters). CC-BY 4.0 https://oap.ospar.org
Emilia Jarochowska πŸ‡ΊπŸ‡¦πŸŒ±Emiliagnathus@circumstances.run
2023-02-11

Scientist's life is: hardly being able to sleep from excitement. This week we kicked off not one, but TWO new projects with two new team members. The second one will be experimental #diagenesis in #foraminifera, which are widely used for #climate reconstructions. They record the #isotope composition of the seawater in which they lived, but that composition may be altered after their death - we will try to reproduce this experimentally in the lab as part of a nessc.nl project. I started a #palaeontology BSc course πŸ‘©πŸΌβ€πŸ« by incorporating analytical methods and teaching students documentation of their analyses by using #RMarkdown. It is an attempt to change the perception of #palaeontology from descriptive and exploratory to a more hypothetico-deductive and quantitative field. And I finished at the Uni of Leicester πŸ‡¬πŸ‡§ with the big honour of examining a PhD candidate who epitomized this approach by establishing a quantitative proxy for the trophic level of #conodonts and possibly any #invertebrates with dental tools. And that's just the highlights. It's a big privilege to be a scientist.

Photographs of living foraminifera from the article by Takagi et al. 2019 https://doi.org/10.5194/bg-16-3377-2019 (CC BY 4.0)
2023-01-02

Working on my lecture for next week on #carbonate #diagenesis, I'm rather pleasantly surprised how much I can take from the papers Daniel Petrash and I wrote on dolomitization - notably our recent one on the interactions in the #MixingZone.
onlinelibrary.wiley.com/doi/fu

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