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carbonates

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.

A scuba diver swims and shines a flashlight through brownish river water in a cave.
Posted inScience Updates

A New Focus on the Neglected Carbonate Critical Zone

by J. B. Martin, P. C. De Grammont, M. D. Covington and L. Toran 20 September 202128 January 2022

Studies of Earth’s critical zone have largely focused on areas underlain by silicate bedrock, leaving gaps in our understanding of widespread and vital carbonate-dominated landscapes.

Loading an instrument for clumped-isotope analysis
Posted inResearch Spotlights

Carbonate Standards Ensure Better Paleothermometers

by Jack Lee 1 June 20219 November 2021

A community effort finds that carbonate standards eliminate the interlaboratory differences plaguing carbonate clumped-isotope thermometry studies.

Two frosted glassy spheres with bumps and cracks on their surfaces
Posted inNews

“Glass Pearls” in Clamshells Point to Ancient Meteor Impact

by R. Crowell 24 September 20197 March 2022

Research suggests that the spherical structures, smaller than grains of sand, may be microtektites, but additional investigations are needed to verify their identity.

Drone photo of a shoal in the Turks and Caicos Islands
Posted inResearch Spotlights

Old Idea Spurs New Research into Origins of Carbonate Mudstones

by Aaron Sidder 12 April 20198 November 2021

Using modern techniques, scientists tested an old hypothesis about carbonate mud production to shift the thinking about rocks that are used as seawater archives and a source of petroleum.

A sediment core offers clues into past patterns in ocean circulation and climate change
Posted inResearch Spotlights

Tiny Marine Shells Reveal Past Patterns in Ocean Dynamics

by Aaron Sidder 16 November 201815 November 2021

A 400,000-year calcium carbonate record from the ocean floor sheds light on deep-ocean circulation and on mechanisms driving climate patterns and atmospheric carbon dioxide concentrations.

Helix pomatia snail shell from Italy
Posted inNews

Boiled or Raw, Snail Shells Keep an Environmental Archive

by Kimberly M. S. Cartier 15 December 201715 November 2021

Snail shells discovered at archaeological sites might still accurately record past weather and vegetation despite being the leftovers of a past meal.

Models reconstruct past ice sheets to better understand future climate change.
Posted inResearch Spotlights

Ancient Ocean Floor Seashells Improve Model of Past Glaciers

by E. Underwood 1 November 20164 May 2022

More accurate reconstruction of ice sheets over the past 150,000 years could help scientists predict future climate change.

Variations in rock hold clues to the movement of the intertropical convergence zone and how it may have influenced the Earth’s climate. Title tag: Variations in rock hold clues to the movement of the intertropical convergence zone and how it may have influenced the Earth’s climate.
Posted inResearch Spotlights

Simulating the Climate 145 Million Years Ago

by S. Hall 10 October 201620 April 2022

A new model shows that the Intertropical Convergence Zone wasn't always a single band around the equator, which had drastic effects on climate.

Unnamed crater in eastern Hesperia Planum, Mars.
Posted inResearch Spotlights

Martian Carbonates Spotted by the Orbiter

by Kate Wheeling 3 May 201624 February 2022

The minerals identified by the Mars Reconnaissance Orbiter provide more evidence that the planet may have once been habitable.

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