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clays

Comparison of the range of lithium isotopic ratios measured in this work at the Bisley 1 catchment in Puerto Rico with those previously published.
Posted inEditors' Highlights

Extreme Lithium Isotope Fractionations During Intense Weathering

by Lixin Jin 18 April 202214 April 2022

Extreme lithium fractionation is observed when primary minerals in andesite are transformed to secondary clay minerals and then to oxides with intensive chemical weathering in a tropical climate.

Detailed image shows sculpted layers of ice at Mars’s south pole.
Posted inNews

The Bumpy Search for Liquid Water at the South Pole of Mars

by Damond Benningfield 8 March 20228 March 2022

Studies since 2018 have provided competing explanations of bright radar reflections from the base of the south polar ice cap.

Two microstructural schematic diagrams showing how clay influences the void space connectivity and permeability of unfaulted sandstone and faulted sandstone.
Posted inEditors' Highlights

Clay Type, Not Just Content, Crucial for Fault Zone Permeability

by Michael Heap 14 February 202215 March 2022

Faults containing clays are often considered as barriers to fluid flow but new work shows that fault processes leading to the formation of clays can increase permeability relative to the host rock.

Two charts comparing saturated hydraulic conductivity as function of clay content for temperate and tropical environments.
Posted inEditors' Highlights

Not All Clays are Made Equal – and it Matters for Hydrology

by Valeriy Ivanov 10 February 202215 March 2022

Soil clay content is an important characteristic that affects many hydraulic and mechanical properties of soil; clay mineral type is important for their prediction.

Sediment sampling sites along the Chilean coast showing the locations of marine surface sediment sampling and river sediment sampling.
Posted inEditors' Highlights

Tracking Reverse Weathering

by S. D. Jacobsen 12 March 202024 February 2022

Using beryllium isotopes to track in situ formation of clays in the ocean, known as reverse weathering, will improve global models of atmospheric carbon dioxide and ocean alkalinity.

Clay chemist Lynda Williams holds a handful of green clay, which she shows has healing properties.
Posted inNews

Healing Power of Clay? Not as Off-the-Wall as You Might Think

by H. Hagemann 12 December 201811 January 2022

An ancient folk remedy, blue-green iron-rich clay, kills antibiotic-resistant bacteria using a one-two punch, a new study shows.

Posted inResearch Spotlights

Accounting for the Missing Silica in the Marine Sediment Cycle

by Terri Cook 16 January 201828 January 2022

Cosmogenic silicon-based estimates of the amount of biogenic silica stored in clays along continental margins could explain the large discrepancy in the nutrient’s global marine budget.

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.

cyanobacteria coated in clay minerals
Posted inNews

How Did Fragile Early Microbes Become Fossils?

by L. Joel 12 August 201622 February 2022

During the Ediacaran period more than a half billion years ago, clay mineral coats likely shielded delicate remains, helping them become exquisitely preserved in rock, recent experiments suggest.

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