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Or M. Bialik
@obialik.bsky.social
Sediment, climate change, and impostor syndrome | Science and SFF for the win | Writing for a living and fun | Opinions are my own (or the characters' in my head). Academic stuff: obialik.weebly.com Non-academic writing: ombialik.weebly.com
652 followers100 following1.1k posts
OMobialik.bsky.social

Hi @bsky.app, other then pinned and scheduled posts (which I wanted way more then video, BTW) - any chence we could get higherlinked text and not just have to dump the full address in the post? Thanks.

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OMobialik.bsky.social

Unfortunately, most of the people I know in that field are Bronze Age or older (and/or on the boundary between geology/marine sciences and archeology).

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OMobialik.bsky.social

What about archeology adjacent? Been involved in a few multi-disciplinary projects across the archology-geology-geochemistry spectrum (paleo-diet, farming/forging, construction etc.) Thomas Tütken at Mainz does a lot of that from the geology side (Guy Bar-Oz at Haifa was on the archeological side).

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OMobialik.bsky.social

Not writing any papers on the effect of bioturbation (this week, possibly later this year), but was working on updating slides for one of my courses. This is the nice thing about academia - you can go into things you are interested in and excited about into the classroom. #AcademicSky

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OMobialik.bsky.social

Just for the record, the shift was probably much more important for the evolution of the benthic macronutrient cycles (Phosphate, Nitrogen). Those are harder to quantify in paleo, but they have been modeled. www.sciencedirect.com/science/arti...

Figure 3 from Dale et al. (2016): Simulated concentrations in modern shelf sediments. (a) Dissolved oxygen, (b) nitrate + nitrite, (c) phosphate, (d) organic C, (e) organic P (including Porg-U), (f) iron-associated P, (g) carbonate fluorapatite, and (h) total reactive P. Green and black curves represent scenarios with oxic and anoxic bottom waters, respectively. Dashed red curves show simulation results for oxic sediments without the microbial P pump and thus the effect of animals only. The dashed blue curves examine the effect of microbial P without bioturbation and bioirrigation. Despite preferential mineralization of Porg in oxic sediment layers, Porg concentrations are highest in the oxic scenario due to the synthesis of microbial Porg. Corg concentrations are, in contrast, lower in oxic sediments. Porg is absent below the bioturbation zone in the simulation without microbial P synthesis. Note difference in depth scale.
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OMobialik.bsky.social

One of the interesting things that happened once animals evolved was that they started to make holes in the sediment. This not only opened a new niche once they figured out how to dig but also changed how some elements (e.g., sulfur) exchanged with the water above. www.nature.com/articles/nge... 🧪⚒️

Protracted development of bioturbation through the early Palaeozoic Era - Nature Geoscience
Protracted development of bioturbation through the early Palaeozoic Era - Nature Geoscience

Mobile organisms first appeared in the fossil record prior to the Precambrian–Cambrian transition. Sediment textures indicate that the degree of sediment mixing by animal activity remained low for 120...

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OMobialik.bsky.social

Let the Semifinals begin in #MinCupwww.mineralcup.org/2024/vote/r4m1

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OMobialik.bsky.social

I wanted to say it's alarming, but at this point, it is depressingly expected as we are seeing an ongoing slowing down of multiple segments of the overturn circulation. It's like seeing half the Miocene in reverse within my lifetime.

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OM
Or M. Bialik
@obialik.bsky.social
Sediment, climate change, and impostor syndrome | Science and SFF for the win | Writing for a living and fun | Opinions are my own (or the characters' in my head). Academic stuff: obialik.weebly.com Non-academic writing: ombialik.weebly.com
652 followers100 following1.1k posts