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Geochemistry

A panoramic view of rocky mounds on a rust-colored Martian landscape
Posted inNews

Does This Mineral Indicate Oxygen on Mars?

by Elise Cutts 30 January 202330 January 2023

Manganese oxides are thought to be a signature of atmospheric oxygen. But on the Red Planet, recent results suggest they might be more of a red herring.

A person’s hand holding many pills and a pile of pills on the surface underneath
Posted inResearch Spotlights

What Happens to Drugs After They Leave Your Body?

by Saima May Sidik 24 January 202331 January 2023

It’s hard to predict with certainty how drugs break down once they enter waterways. In a new study, scientists devised a way to do just that.

A pebble-sized meteorite sits next to a dime for scale.
Posted inNews

Martian Meteorites Offer a Tantalizing Glimpse of the Red Planet

by Katherine Kornei 23 November 202223 November 2022

By studying these literal chunks of Mars, scientists are learning more about the Red Planet’s deep interior and impact history.

World map
Posted inEditors' Highlights

Machine Learning Looks Anew at Isotope Ratios in Oceanic Basalts

by Paul Asimow 25 October 202224 October 2022

While past attempts to define isotopic endmembers and assign them a geodynamic significance ended in controversy, a machine-learning clustering algorithm offers a solution to this classical problem.

La visión de un artista que nos ofrece una visión de la formación de los planetas: Cerca de la estrella, las partículas de polvo se convierten en planetesimales y planetas similares a la Tierra. En la parte más lejana, el gas se acumula en los núcleos planetarios para la formación de gigantes similares a Júpiter.
Posted inNews

Isótopos de criptón proporcionan nuevos indicios sobre el pasado de los planetas

by Carolyn Wilke 21 October 202221 October 2022

Para determinar cómo los elementos cruciales para el desarrollo de la vida llegaron a la Tierra, los científicos estudian los gases nobles. Actualmente, métodos mejorados traen consigo nuevos indicios a partir del criptón, el gas noble más enigmático.

Monash University Professor Andrew Tomkins (left) and Royal Melbourne Institute of Technology (RMIT) Ph.D. scholar Alan Salek examine a ureilite meteorite sample at the RMIT Microscopy and Microanalysis Facility.
Posted inNews

Rare Meteorites Shed Light on Diamond Formation

by Katherine Kornei 18 October 202218 October 2022

By studying meteorites believed to be remnants of the catastrophic breakup of a dwarf planet, researchers are learning how lonsdaleite, a particularly hard type of diamond, forms in nature.

A blue-gray river runs through a steep mountainous terrane, with the slopes nearest the river coated in green grasses, plants, and coniferous trees.
Posted inNews

What Can Zircons Tell Us About the Evolution of Plants?

by Alka Tripathy-Lang 5 October 202218 October 2022

The versatile mineral could contain evidence of the evolution of land plants and their effect on the sedimentary system.

Photograph of USGS scientists collecting soil and worms at a site on Cape Cod, Massachusetts, that was contaminated by per- and polyfluoroalkyl substances.
Posted inEditors' Vox

Widespread “Forever Chemicals” in Subsurface Environments

by Dengjun Wang and Xueyan Lyu 30 September 202230 September 2022

Massive use of materials containing per- and polyfluoroalkyl substances in commercial and industrial sectors has led to their widespread occurrence in subsurface environments.

Gloved hands hold a dark chunk of rock, a part of the Aguas Zarcas meteorite.
Posted inNews

Tiny “Pancakes” Suggest Some Asteroids May Stay Active

by Damond Benningfield 22 September 202222 September 2022

Analysis of a meteorite that fell in Costa Rica shows that its parent body may resemble the asteroid Bennu.

Photo of Cerro Aconcagua, the highest mountain in the Americas
Posted inEditors' Vox

Old Igneous Rocks Hold the Key to Crustal Thickness Evolution

by Peter Luffi and Mihai Ducea 7 September 202229 September 2022

The chemical composition of orogenic igneous rocks and their zircons is sensitive to crustal thickness and can be used to quantify the evolution of Moho depths beneath continents back in time.

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Features from AGU Journals

RESEARCH SPOTLIGHTS
JGR: Solid Earth
“New Tectonic Plate Model Could Improve Earthquake Risk Assessment”
By Morgan Rehnberg

EDITORS' HIGHLIGHTS
AGU Advances
“Eminently Complex – Climate Science and the 2021 Nobel Prize”
By Ana Barros

EDITORS' VOX
Perspectives of Earth and Space Scientists
“New Directions for Perspectives of Earth and Space Scientists”
By Michael Wysession


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