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geochemistry

A rust-colored fossilized feather within a dark gray rock
Posted inNews

A 30,000-Year-Old Feather Is a First-of-Its-Kind Fossil

by Grace van Deelen 9 April 20259 April 2025

A new analysis of a fossil found in 1889 has unveiled the presence of zeolites—and an entirely new mineralization method.

Diagram of the model presented in the paper.
Posted inEditors' Highlights

Hawai’i’s Depleted Peridotite Delivers More Magma

by Vincent Salters 24 March 202524 March 2025

The source for the isotopically-enriched Hawaiian magmas contains peridotites that experienced near-surface melting prior incorporation in the plume.

People on a rubber raft collecting water samples from a brown lake
Posted inNews

Extreme Heat and Rain Turned These Arctic Lakes Brown

by Larissa G. Capella 3 March 20253 March 2025

Scientists are stunned by the changes in multiple Arctic lakes, all transforming in the same way.

Gray photo of a crater on the dwarf planet Ceres
Posted inResearch Spotlights

Ceres’s Organics Might Not Be Homegrown After All

Sarah Stanley, Science Writer by Sarah Stanley 10 February 202510 February 2025

Scientists have been unable to determine whether the dwarf planet’s organics were produced by its own chemical processes or delivered by asteroids. New evidence implicates asteroids.

A radiation warning sign in front of a wooded area
Posted inNews

Wildfires Raise Concern About Remobilized Radioactive Contamination

by Carolyn Wilke 30 January 202530 January 2025

Researchers collected soil and ash after the 2020 wildfires in the Chernobyl Exclusion Zone. Chemical tests suggested that the fires made it easier for contaminants to wash into nearby rivers.

A top-down view of green and brown land with a roughly circular depression with a blue lake in the middle
Posted inNews

Ice Core Records Shed Light on a Volcanic Mystery

Katherine Kornei, Science Writer by Katherine Kornei 29 January 202529 January 2025

By analyzing sulfur and volcanic ash entrained in ice cores, researchers pinpointed a caldera in the remote Kuril Islands as the site of an unidentified 19th century eruption.

Illustrations from the study.
Posted inEditors' Highlights

Magma Diversity in Iceland

by Peter Zeitler 19 December 202419 December 2024

Iceland’s recent basalt eruptions originated at the crust-mantle boundary and show chemical variability over remarkably short timescales of weeks, suggesting exchanges between diverse magma sources.

A hand in a blue glove holds a plastic cup out to catch a stream of water.
Posted inNews

Nebraska High Schoolers Test Well Water Quality

by Emily Dieckman 11 December 202417 December 2024

The Know Your Well program gives high school students experience in hands-on STEM research while providing community members information about their water quality.

Side-by-side images of irregularly shaped gray/brown rocks in space.
Posted inNews

Pluto’s Small Moons Are Unlike Any Other

Kimberly M. S. Cartier, News Writing and Production Intern for Eos.org by Kimberly M. S. Cartier 10 December 202410 December 2024

The strange blend of surface chemistry on Nix and Hydra raises big question about the evolution of the Pluto system.

Orange and yellow lava shoots out of a black mound.
Posted inNews

Hot Spot Lavas Around the World May Have Something in Common

by Bill Morris 23 October 202423 October 2024

A global study of lavas from volcanic hot spots suggests that contrary to accepted wisdom, Earth’s deep mantle may have the same composition throughout. Not everyone is convinced, however.

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Features from AGU Publications

Research Spotlights

Mapping the Ocean Floor with Ancient Tides

6 May 20256 May 2025
Editors' Highlights

First Benchmarking System of Global Hydrological Models

7 May 20257 May 2025
Editors' Vox

Decoding Crop Evapotranspiration

6 May 20256 May 2025
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