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geochemistry

Illustration of the geological evolution of Earth
Posted inNews

Looking Back at Our Pale Blue Dot

by C. Fogerty 23 April 20208 April 2022

Astronomers model changes in Earth’s chemical signature over the past 4 billion years to improve the search for Earth-like exoplanets.

Research vessel in the Arctic Ocean
Posted inNews

The Arctic Ocean May Not Be a Reliable Carbon Sink

by Hannah Thomasy 7 April 202025 January 2023

The rapid changes happening in the Arctic Ocean, including increasing freshwater input, could dramatically affect its ability to store carbon.

Taro Takahashi (right) and two students in Takahashi’s mineral physics laboratory at Alfred University, circa 1960
Posted inNews

Taro Takahashi (1930–2019)

by W. A. Bassett 12 March 202021 October 2021

This giant in geochemistry also pioneered early high-pressure, high-temperature studies that launched the field of mineral physics.

Sediment sampling sites along the Chilean coast showing the locations of marine surface sediment sampling and river sediment sampling.
Posted inEditors' Highlights

Tracking Reverse Weathering

by S. D. Jacobsen 12 March 202024 February 2022

Using beryllium isotopes to track in situ formation of clays in the ocean, known as reverse weathering, will improve global models of atmospheric carbon dioxide and ocean alkalinity.

Illustration of a huge planetoid impacting Earth
Posted inNews

Earth Rocks and Moon Rocks Are More Different Than We Thought

by Javier Barbuzano 9 March 202010 November 2021

New analyses of oxygen isotopes reveal terrestrial and lunar rocks aren’t as similar as previously thought, potentially changing the way we think the Moon formed.

Multicomponent ionic transport simulations in a physically and electrostatically heterogeneous domain
Posted inEditors' Highlights

Modeling Transport and Charge Effects in Heterogeneous Media

by Xavier Sanchez-Vila 19 February 20206 February 2023

Simulation of charged species reactive transport in complex physically and electrostatically heterogeneous porous media is possible with a multiple continua approach coupled to a geochemical code.

Cave formations in Furong Cave near Chongqing, China
Posted inResearch Spotlights

How to Read Atmospheric History Written in Flowstones

by Elizabeth Thompson 10 February 202028 January 2022

Oxygen isotope ratios in cave deposits reflect past climates, but interpreting these data is not straightforward. A new study explores what these ratios really tell us.

Schematic of how chlorate could oxidize reducing iron to iron oxides in various aqueous environments on Mars
Posted inEditors' Highlights

Why Is the Red Planet Red? Chlorate May Oxidize Mars’ Surface

by Y. Sekine 6 December 201922 December 2021

Laboratory experiments and geochemical model suggest that chlorate is very effective to oxidize reducing iron to reddish iron oxides on Mars when liquid water was present on the surface.

Greenery forefronts an image of a dust storm clouding the horizon
Posted inNews

Dusting Off the Arid Antiquity of the Sahara

by Sarah Derouin 14 October 20192 March 2023

New research on the geochemistry of Canary Islands paleosols shows that the Sahara has been an arid dust producer for at least 4.8 million years.

A landscape of dark volcanic rocks forefronts a beautiful blue ocean.
Posted inNews

Leaky at the Core

by Jon Kelvey 23 September 201920 April 2022

New evidence from deep mantle plumes suggests that Earth’s liquid outer core might be leaking tungsten isotopes into the lower mantle.

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