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continents

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.

Aerial image of the summit caldera of Erta Ale volcano
Posted inNews

Are We Seeing a New Ocean Starting to Form in Africa?

Erik Klemetti, Science Writer by Erik Klemetti 8 May 202018 October 2022

Although shallow magma storage at Erta Ale volcano hints at a rift-to-ridge transition, the tectonic future of the Afar region is far from certain.

Point Sal on the California coastline in an aerial view of the study site for the 2017 Inner Shelf Dynamics Experiment.
Posted inScience Updates

Untangling a Web of Interactions Where Surf Meets Coastal Ocean

by J. Lerczak, J. A. Barth, S. Celona, C. Chickadel, J. Colosi, F. Feddersen, M. Haller, S. Haney, L. Lenain, J. A. MacKinnon, J. MacMahan, K. Melville, A. O’Dea, P. Smit, A. Waterhouse and T. Xu 2 May 201911 January 2022

In 2017, an ocean research team launched an unprecedented effort to understand what drives ocean currents in the overlap regions between surf zones and continental shelves.

The Getz Ice Shelf in Antarctica
Posted inResearch Spotlights

Very Warm Water Observed Along West Antarctic Ice Shelf

by Terri Cook 11 April 201911 January 2022

Two years of mooring observations at the edge of the continental shelf show that wind stress and upwelling control the inflow of some of the warmest water observed at an ice shelf front in Antarctica.

A view of the Scottish Highlands, where a geologist first recognized Barrovian geological regional metamorphism.
Posted inResearch Spotlights

Regional Metamorphism Occurs Before Continents Collide

by Terri Cook 3 January 201911 January 2022

Evidence from collision zones suggests that the high temperatures that create regional zones of metamorphic minerals occur in wide, hot back arcs prior to continental collision deformation.

The flat Australian outback overlies a series of ancient mountain chains.
Posted inResearch Spotlights

Unraveling the Origins of Australia’s Ancient Mountain Chains

by Terri Cook 5 November 201813 October 2022

New data synthesis suggests that varying rates of trench retreat along the margin of the Gondwana supercontinent were responsible for the curvature of the Tasmanide mountain chains.

Posted inEditors' Highlights

Are Diamonds Ubiquitous Beneath Old Stable Continents?

by Sergei Lebedev 7 August 20182 March 2023

Although rare at the Earth’s surface, diamonds may be commonplace at depths of 120 to 150 kilometers below the surface within the lithosphere of old continents.

Researchers use seafloor pressure sensor data to examine how infragravity waves are reflected back to shore by the edge of a continental shelf
Posted inResearch Spotlights

On the Origin of Infragravity Waves

by Terri Cook 23 July 201824 February 2023

Seafloor pressure sensor data show that long-period ocean surface waves radiating from the world’s shorelines are mostly reflected back to shore by the continental shelf edge.

Researchers analyze how low-angle, high-displacement faults influence the evolution of continental rifts.
Posted inResearch Spotlights

An Improved Understanding of How Rift Margins Evolve

by Terri Cook 21 March 201829 September 2022

A new seismic reflection study of the mid-Norwegian margin examines the role that low-angle, high-displacement faults play in the evolution of continental rifts.

Michael DeLucia standing in front of the Great Unconformity
Posted inNews

Erasing a Billion Years of Geologic Time Across the Globe

Lucas Joel by L. Joel 5 February 201823 February 2023

The Great Unconformity—a huge time gap in the rock record—may have been triggered by the uplift of an ancient supercontinent, say researchers using a novel method for dating rocks.

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