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Peter Crockford

@earth2pete.bsky.social

170 followers 190 following 8 posts

Assistant Professor at Carleton University

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Peter Crockford @earth2pete.bsky.social · Feb 18

I am extremely honoured to have been awarded a 2025 Sloan Fellowship. A huge thank you to the Sloan foundation for their support and to my mentors for getting me here.

Alfred P. Sloan Foundation @sloanfoundation.bsky.social · Feb 18

🎉Congrats to the 126 early-career scientists who have been awarded a Sloan Research Fellowship this year! These exceptional scholars are drawn from 51 institutions across the US and Canada, and represent the next generation of groundbreaking researchers. sloan.org/fellowships/...

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Peter Crockford @earth2pete.bsky.social · Jun 27

New Paper on Sturtian Barite!

pubs.geoscienceworld.org/gsa/geology/...

Mantle-like Sr isotopes in a Sturtian cap carbonate in Oman | Geology | GeoScienceWorld

pubs.geoscienceworld.org

Peter Crockford @earth2pete.bsky.social · Jun 27

www.science.org/doi/10.1126/...

Evidence for Hadean mafic intrusions in the Nuvvuagittuq Greenstone Belt, Canada

Many questions remain regarding Earth’s earliest crust owing to the rarity of Hadean (>4.03 billion-year-old) rocks and minerals. The Nuvvuagittuq Greenstone Belt (NGB) in Canada may be the only known...

www.science.org

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Peter Crockford @earth2pete.bsky.social · Jun 19

New Paper

Depositional Controls on ∆′17O Signatures of Sedimentary Sulfate - Crockford - 2025 - Geophysical Research Letters - Wiley Online Library agupubs.onlinelibrary.wiley.com/doi/10.1029/...

Thanks to all of the folks who helped this over the finish line.

Depositional Controls on ∆′17O Signatures of Sedimentary Sulfate

Sulfate triple oxygen isotope signatures are most consistent with terrestrial pyrite oxidation and subsequent dilution Depositional environment must be considered in the translation of sulfate ∆′...

agupubs.onlinelibrary.wiley.com

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Reposted by Peter Crockford

Chad Briggs @chadmbriggs.bsky.social · May 10

www.pnas.org/doi/10.1073/...

Abstract
A limited nuclear war between India and Pakistan could ignite fires large enough to emit more than 5 Tg of soot into the stratosphere. Climate model simulations have shown severe resulting climate perturbations with declines in global mean temperature by 1.8 °C and precipitation by 8%, for at least 5 y. Here we evaluate impacts for the global food system. Six harmonized state-of-the-art crop models show that global caloric production from maize, wheat, rice, and soybean falls by 11 (±1)%, 11 (±8)%, 3 (±5)%, and 17 (±2)% over 5 y. Total single-year losses of 12 (±4)% quadruple the largest observed historical anomaly and exceed impacts caused by historic droughts and volcanic eruptions. ...

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Reposted by Peter Crockford

Jay T. Cullen @jaytcullen.bsky.social · May 7

🌊🧪Job Alert!!! @oceannetworks.ca is looking for a Chief Executive Officer. Come join us at the University of Victoria 🇨🇦

www.linkedin.com/jobs/view/ch...

Ocean Networks Canada hiring Chief Executive Officer in Victoria, British Columbia, Canada | LinkedIn

Posted 11:14:22 PM. Ocean Networks Canada (ONC) is a world-leading, not-for-profit organization that supports ocean…See this and similar jobs on LinkedIn.

www.linkedin.com

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Reposted by Peter Crockford

Dr. Ichiko Sugiyama (she/her) @chikoblast.bsky.social · Apr 10

Paper alert 🚨 Interaction of metal oxyions with carbonate green rust in seawater is out now! This is one of the few papers that investigated metal uptake with GRCO3 in seawater and conducted 1 year aging experiments! Link here: www.sciencedirect.com/science/arti... #biogeochemistry #metal #greenrust

Interaction of metal oxyions and phosphate with carbonate green rust: Insights into Earth’s modern and ancient environments

Carbonate green rust (GRCO3) is often found in suboxic and anoxic environments, and is known to be highly reactive towards dissolved metals and other …

www.sciencedirect.com

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Peter Crockford @earth2pete.bsky.social · Mar 3

New Paper!

rdcu.be/ebWko

Marine sulphate captures a Paleozoic transition to a modern terrestrial weathering environment

Nature Communications - Ancient sulfate mineral compositions reflect an increase in Earth’s oxidation state ~400 million years ago, likely including an increase in atmospheric oxygen levels...

rdcu.be

Peter Crockford @earth2pete.bsky.social · Feb 18

I am extremely honoured to have been awarded a 2025 Sloan Fellowship. A huge thank you to the Sloan foundation for their support and to my mentors for getting me here.

Alfred P. Sloan Foundation @sloanfoundation.bsky.social · Feb 18

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Peter Crockford @earth2pete.bsky.social · Dec 19

Marine Zn limitation is a thing bg.copernicus.org/articles/21/...

High metabolic zinc demand within native Amundsen and Ross sea phytoplankton communities determined by stable isotope uptake rate measurements

Abstract. Zinc (Zn) is an essential micronutrient for most eukaryotic phytoplankton. Zn uptake by phytoplankton within the euphotic zone results in nutrient-like dissolved Zn (dZn) profiles with a lar...

bg.copernicus.org

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Reposted by Peter Crockford

David Ho @davidho.bsky.social · Dec 8

I'll never understand how bottom trawling is legal. 🌊

www.nature.com/articles/s41...

Long-term carbon storage in shelf sea sediments reduced by intensive bottom trawling - Nature Geoscience

Intensive bottom trawling causes a long-term reduction of organic carbon stored in seafloor sediments, suggesting a need for more effective management, according to observations and biogeochemical mod...

www.nature.com

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Peter Crockford @earth2pete.bsky.social · Dec 5

New Paper on the history of the sulfur cycle! can01.safelinks.protection.outlook.com?url=https%3A...

The history of Earth’s sulfur cycle

Nature Reviews Earth & Environment - The redox transformations of sulfur mean it is a key component of global biogeochemical cycles. This Review explores the sulfur cycle over geological time,...

can01.safelinks.protection.outlook.com

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Reposted by Peter Crockford

bioRxiv Evolutionary Biology @biorxiv-evobio.bsky.social · Feb 9

Experimental Snowball Earth Viscosity Drives the Evolution of Motile Multicellularity https://www.biorxiv.org/content/10.1101/2024.02.06.579218v1

During the 70-million-year span of the Cryogenian Snowball Earth glaciations, low ocean temperatures

www.biorxiv.org

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Peter Crockford @earth2pete.bsky.social · Dec 13

New Paper! “The Geologic History of Primary Productivity”
With Itay Halevy, Ron Milo, Yinon Bar On and Luce Ward

www.sciencedirect.com/science/arti...

Link: drive.google.com/file/d/1KoXa...

And featured in the New York Times!

www.nytimes.com/2023/12/01/s...

The geologic history of primary productivity

The rate of primary productivity is a keystone variable in driving biogeochemical cycles today and has been throughout Earth’s past.1 For example, it …

www.sciencedirect.com

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