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Geochemistry, Geophysics, Geosystems

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The Alaknanda River, seen from stream level, flows among mountains in northern India.
Posted inResearch Spotlights

Tracking Trace Elements in the Ganga River

by David Shultz 16 October 202016 February 2022

Levels of dissolved trace and heavy metals, which can be toxic, are highly variable across the river basin, concentrating in urban areas with high pollution but diluted by inflow from tributaries.

Deformed buildings, beached boats, and debris litter a coastline in Japan.
Posted inNews

What Controls Giant Subduction Earthquakes?

by P. Waldron 15 October 202016 March 2022

Subduction zones with a low dipping angle and thick sediments can produce giant earthquakes; this finding lets researchers estimate worst-case scenarios for coastlines around the world.

Schematic cross section across the Cordillera Blanca massif and conceptual model for structural controls on fluid circulation
Posted inEditors' Highlights

Structural Style Controls Crustal Fluid Circulation in Andes

by W. Behr 26 August 202028 January 2022

Variations in hot spring geochemistry from adjacent mountain ranges with different styles of faulting highlight the influence of crustal-scale structures on circulating fluids in the Peruvian Andes.

Interpretations of seismic reflection transects across a section of the Australia-Antarctic rift margin
Posted inEditors' Highlights

New Data from Earth’s Largest Non-Volcanic Rift Margin

by W. Behr 24 August 202027 January 2023

Seismic reflection images combined with petrological data provide new constraints on the nature of the basement in the enigmatic Australia-Antarctic oceanic-continent transition zone.

Four maps of the Red River region in different periods of geologic history showing composition of sediment samples
Posted inEditors' Highlights

A River Ran Through It

by Peter van der Beek 19 August 202026 January 2023

The history of river system in southeast Tibet and Indochina reconstructed using the ages of thousands of zircon sand grains in modern and ancient river sediments.

Schematic showing behavior of magma in the Main Ethiopian Rift
Posted inEditors' Highlights

Gas-Rich, Transcrustal Magma Storage in the Main Ethiopian Rift

by Claudio Faccenna 14 August 202024 March 2023

Increments of melt trapped in crystals reveal upper crustal magmas in the Main Ethiopian Rift are rich in water and other volatiles, leading to extensive diffuse degassing and hydrothermal systems.

Cartoon showing a map view of the top of a subducting plate modeled on present day subduction at Nankai in southwest Japan
Posted inEditors' Highlights

A Mechanism for Shallow, Slow Earthquakes in Subduction Zones

by U. Faul 30 July 202018 January 2022

Slow earthquakes beneath the accretionary prism updip from the locked portion of a subduction zone can be caused by basaltic blocks embedded in a shale matrix.

World map showing distribution of SEAfloor FLuid Expulsion Anomalies (SEAFLEASs)
Posted inEditors' Highlights

A New Global Map of Seafloor Fluid Expulsion Anomalies

by Claudio Faccenna 20 April 202023 January 2023

The first open-source database of SEAfloor FLuid Expulsion Anomalies (SEAFLEASs) at a global scale reveals their distribution and physical parameters.

A mountainside exposing sedimentary rocks of the Fifteenmile Group in the Ogilvie Mountains, Yukon
Posted inResearch Spotlights

Review of Go-To Iron Analysis Method Reveals Its Pros and Cons

by David Shultz 27 March 202016 June 2022

Researchers validated some steps in the standard sequential chemical technique used to extract different forms of iron from rock samples but found inconsistencies in other steps.

Figuring showing thickness of the crust in the High Arctic and Circum-Arctic regions
Posted inEditors' Highlights

Revealing the Arctic Crust

by Claudio Faccenna 25 July 201924 March 2023

A new model, ArcCRUST, reveals with unprecedent resolution the geometry and the thermal state of the oceanic crust of the High Arctic and Circum-Arctic domain.

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