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isotopes

A green hill sits beneath a blue sky.
Posted inResearch Spotlights

Isotopes Unearth History of Earthquakes in the Apennines

by Nathaniel Scharping 17 April 202517 April 2025

Dating of cosmogenic chlorine isotopes yields long-term estimates of fault activity in Italy, showing that periods of earthquakes and quiescence alternate over millennia.

Diagram from the study.
Posted inEditors' Highlights

Taking Our Paleoceanographic Tools to the Next Level

by David Thornalley 2 April 202527 March 2025

A new modeling study shows that to accurately interpret data derived from an iconic proxy of past Atlantic overturning strength, we must consider the complex factors governing the proxy systematics.

Diagram of the model presented in the paper.
Posted inEditors' Highlights

Hawai’i’s Depleted Peridotite Delivers More Magma

by Vincent Salters 24 March 202524 March 2025

The source for the isotopically-enriched Hawaiian magmas contains peridotites that experienced near-surface melting prior incorporation in the plume.

An image from under a microscope of luminous objects shaped like seashells. The background is a purplish blue color.
Posted inResearch Spotlights

Getting to the Bottom of Cenozoic Deep-Ocean Temperatures

Aaron Sidder, freelance science writer by Aaron Sidder 2 December 20242 December 2024

Reconstructing past ocean conditions with oxygen isotopes could provide more information about how Earth’s climate evolved over time, but methods for reconstructing these data can yield varying results.

海洋附近的火山喷发将烟雾和蒸汽送入天空。
Posted inResearch Spotlights

追踪古萨摩亚消失的地幔柱

by Nathaniel Scharping 26 November 202426 November 2024

一层厚厚的地壳可能盖住了萨摩亚火山柱,抑制了火山活动3000万年,这就解释了萨摩亚火山链上一个奇怪的裂缝。

Graph from the paper.
Posted inEditors' Highlights

Clumped CO Isotopes – New Tracers for Atmospheric Chemistry

by Susan Trumbore 30 October 202430 October 2024

A new study reports the first measurements of 13C18O in atmospheric carbon monoxide (CO) and show their variations reflect chemical ‘aging’ consistent with predicted kinetic isotope effects.

A volcanic eruption near the ocean sends smoke and steam into the sky.
Posted inResearch Spotlights

Tracking a Disappearing Mantle Plume in Ancient Samoa

by Nathaniel Scharping 25 October 202426 November 2024

A thick portion of Earth’s crust may have capped the Samoan plume and suppressed volcanism for 30 million years, explaining a curious gap along the Samoan chain.

在这张江错的照片中,多云的天空在背景中的低矮山丘上投下阴影。中景的湖水呈现灰蓝绿色的色调。前景中,湖岸上生长着一簇簇棕褐色的小草,红色沙地上点缀着棱角分明的深色鹅卵石。
Posted inNews

哺乳动物的粪便保存了青藏高原的人类和气候历史

by Alka Tripathy-Lang 27 September 202427 September 2024

沉积物中的地球化学标记,包括来自人类和动物粪便的有机分子,帮助科学家们追寻吐蕃帝国的兴衰。

汉代长城是一层层长满青草的褐色结构。
Posted inNews

在中国长城寻找气候线索

by J. Besl 23 September 202423 September 2024

在中国的西北部,沙漠条件保存了长城最偏远的部分。科学家们正在探索着2000年前的建筑材料,以寻找该地区过去气候的迹象。

Red-tinted water flows in a shallow stretch of river, with a rocky shoreline and forested hillslope in the background.
Posted inScience Updates

How Great was the “Great Oxidation Event”?

by Aubrey Zerkle 30 July 202416 January 2025

Geochemical sleuthing amid acid mine runoff suggests that scientists should rethink an isotope signal long taken to indicate low levels of atmospheric oxygen in Earth’s deep past.

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Features from AGU Publications

Research Spotlights

Proposed Experiment Could Clarify Origin of Martian Methane

12 May 202512 May 2025
Editors' Highlights

First Benchmarking System of Global Hydrological Models

7 May 20257 May 2025
Editors' Vox

Decoding Crop Evapotranspiration

6 May 20256 May 2025
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