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geochemistry

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.

Structure of hydrous eutectic silicate melts at different temperatures and pressures
Posted inEditors' Highlights

Hiding Deep Hydrous Melts at the Core-Mantle Boundary

by S. D. Jacobsen 13 September 201922 December 2021

Silicate melts containing H2O in the lowermost mantle are surprisingly dense and may stagnate there, trapping primordial volatiles and potentially causing some of the ultra-low velocity zones.

The Sun sets over Lake Shinji in western Japan
Posted inResearch Spotlights

How Land Use Affects Nutrient Pollution in a Changing Climate

by Elizabeth Thompson 4 September 201916 February 2022

As heavy rain falls more frequently, the land alongside a river has a greater effect on the waterway’s nutrient levels—for better or worse.

Photo of soil samples ready for laboratory sampling
Posted inEditors' Vox

Organic Gases Released and Taken Up by Soil Lack Quantification

by J. Tang, G. Schurgers and R. Rinnan 29 August 201922 December 2021

Soils both emit and take up different biogenic volatile organic compounds, altering the chemical composition of the atmosphere and influencing local, regional, and global climate.

Rocky, steep-sided desert valley
Posted inNews

The Dawning of the Age of Old Aquifers

by Sarah Derouin 21 August 201919 July 2022

A new technique using 81Kr can measure the age of old groundwater in arid regions. The method can be used as a proxy for past climates and weather patterns.

Photo of a man in a lab coat holding a soil core
Posted inNews

New Tool Reveals That Soils Are Teeming with Active Microbes

by Sarah Derouin 6 August 201931 January 2023

BONCAT, a new type of amino acid tagging, highlights and categorizes active soil microbes in situ.

Photograph of biogeochemist Jordon Hemingway collecting a sediment sample from the Thjórsá River in southern Iceland
Posted inNews

The Jail That Keeps Oxygen in the Air

by L. Joel 25 July 201922 February 2022

Oxygen shouldn’t be in the air we breathe. But it is, and the reason why is almost criminal.

An illustration showing microscopic colloidal particles adhered to sand grains in an aquifer from which groundwater is being pumped to the surface via a well.
Posted inResearch Spotlights

Treating Colloids as Clusters Better Predicts Their Behavior

by Terri Cook 25 July 20196 February 2023

New research suggests that an accurate prediction of colloidal particle mobilization in the environment should account for the effect of clustering.

Posted inNews

Alexander R. “Mac” McBirney (1924–2019)

by D. Johnston, D. Geist, T. Morse and R. S. J. Sparks 24 July 201910 October 2021

This former West Point graduate and coffee grower transformed igneous petrology and volcanology.

A small rowboat sits on the edge of Lake Sinclair, one of five lakes in north central New Brunswick surveyed for the new study on DDT contamination.
Posted inNews

The Toxic Legacy of DDT Lives On in Remote Canadian Lakes

by Mary Caperton Morton 23 July 20199 May 2022

DDT and its breakdown products permeate lake sediments decades after the pesticide was banned.

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