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zircons

Posted inEditors' Highlights

Zircons and Plate Tectonics

by Vincent Salters 29 April 20223 May 2022

New data on ancient zircons points to a transition from stagnant lid to subduction style tectonics at 3.6 Ga ago.

A wall of ice looms over an expanse of rocks.
Posted inNews

Impact Structure Hidden Under Arctic Ice Dates to the Paleocene

by Katherine Kornei 13 April 202213 April 2022

Greenland’s Hiawatha impact structure, more than 30 kilometers in diameter, is much older than previously thought, new results suggest.

An impact on the surface of Mars creates a shower of debris.
Posted inNews

Martian Meteorites Reveal Evidence of a Large Impact

by Katherine Kornei 15 March 202215 March 2022

By analyzing rare Martian meteorites, researchers have uncovered a crystalline structure created by a large asteroid or comet impact that potentially affected the Red Planet’s habitability.

Brown, barren, relatively flat land stretches into the distance, dotted with occasional patches of white snow. The dark blue Arctic Ocean laps the shore. A thin sliver of sky is gray and cloudy.
Posted inFeatures

Updating Dating Helps Tackle Deep-Time Quandaries

by Alka Tripathy-Lang 22 February 202222 February 2022

Geochronologists are finding fresh approaches to familiar methodologies, especially by zapping rocks with lasers to tackle classic Precambrian problems.

Artist’s rendering of Earth’s magnetic field, which connects the North Pole with the South Pole
Posted inNews

Oldest Pole Reversal Shows Early Earth Was Well Suited for Life

by Zack Savitsky 15 December 202115 December 2021

Australian rocks 3.25 billion years old preserved the oldest signs of Earth’s stable magnetic field and quickly moving crust, critical elements of life’s evolution.

Wearing a white lab coat, Yiming Zhang, a doctoral student at the University of California, Berkeley, sits in front of a computer screen, examining data, with a mouse in his right hand. To his left, a gray microscope with four copper-colored rings encircling the stage perches on a black table.
Posted inNews

Diamonds Are a Paleomagnetist’s Best Friend

by Alka Tripathy-Lang 19 October 202125 October 2021

Typical paleomagnetic measurements average a sample’s signal. The quantum diamond microscope helps scientists make micrometer-scale maps of magnetism, showing where a sample locked in its magnetic signatures.

Jane, an anthropomorphized zircon crystal, complete with a face, arms, and legs, experiences stages of development in a magma chamber.
Posted inGeoFIZZ

Meet Jane, the Zircon Grain—Geochronology’s New Mascot

by Alka Tripathy-Lang 27 August 202121 March 2022

In a children’s book written by geochronologist Matthew Fox, he condenses 400 million years of history into 34 playfully poetic pages as he follows the travels of a single grain of sand.

Researchers collect sediments from a rocky stream with a helicopter and steep rock hills in the background
Posted inScience Updates

Earth’s Continents Share an Ancient Crustal Ancestor

by J. Hollis, C. Kirkland, M. Hartnady, M. Barham and A. Steenfelt 23 August 202122 February 2022

How did today’s continents come to be? Geological sleuths found clues in grains of sand.

Grayscale scanning electron microscope image of an unpolished tetrahedral zircon crystal with two laser ablation pits, each between 25 and 30 micrometers in diameter
Posted inNews

Vestiges of a Volcanic Arc Hidden Within Chicxulub Crater

by Alka Tripathy-Lang 15 June 202111 November 2021

Scientists discovered magmatic remnants of a volcanic arc by dating granitic rocks of the middle crust excavated by, and hidden within, the Chicxulub impact crater.

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 P. van der Beek 19 August 202011 November 2021

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.

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