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American Journal of Science

Founded in 1818 by Benjamin Silliman. The Journal is devoted to geology and related sciences. www.ajsonline.org
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https://ajs.manuscriptmanager.net/ The American Journal of Science (AJS), founded in 1818 by Benjamin Silliman, is the oldest scientific journal in the United States that has been published continuously. The Journal is devoted to geology and related sciences and publishes articles from around the world presenting results of major research from all earth sciences. Readers are primarily earth scient

ists in academia and government institutions. The American Journal of Science considers contributions from any field within the Earth Sciences, however the papers are expected to be of interest to a broad cross section of the scientific community. Consequently, manuscripts more appropriate for regional or specialty journals are often returned to authors without external review. AJS would like to increase its visibility in the broad field of Earth System History that would address the following three broad areas:
1. The coupling of the solid earth, ocean and atmospheric systems through time
2. The relationships and feedbacks between tectonics and climate
3. Deep time coupling of biology to the chemical evolution of Earth
AJS strives to publish papers with maximum impact in their fields. There are no limits on the minimum or maximum sizes of submitted manuscripts.

06/08/2026

New Paper: Facies Vectors: Disentangling Environmental Variability, Diagenesis, and Secular Change in Carbonate Stratigraphies by Ryan A. Manzuk, Matthew D. Nadeau, Clare Mate, Sarah M. Jacquet, and Adam C. Maloof

Am J Sci 2026; 326:8 https://doi.org/10.2475/001c.161588

“We represent each sampled point in a lower Cambrian section as a vector of data collected through field observations, computational image analyses, and geochemical measurements to formally test the null hypothesis of stratigraphic stasis.”

04/22/2026

New Paper: Reversed Inter-Mineral Fe-Zn Isotope Fractionation in Ophiolitic Peridotites: Evidence for Widespread Hydration of Oceanic Lithospheric Mantle by Ben-Xun Su, Yan Xiao, Jing Wang, Qi-Qi Pan, and Shou-Qian Zhao
Am J Sci 2026; 326:7 https://doi.org/10.2475/001c.160209

“Fluid-assisted element exchange and subsolidus diffusion in various lithologies of the oceanic lithospheric mantle produce reversed inter-mineral isotope fractionation.”

03/30/2026

New Paper: Dependence of River Water Lithium Isotope Ratios on Watershed Attributes Complicates Interpretation of Weathering-Driven CO2 Drawdown by Evan J. Ramos, Preston Cosslett Kemeny, Mark A. Torres, and Tomas N. Capaldi

Am J Sci 2026; 326:6 https://doi.org/10.2475/001c.157531

03/23/2026

New Paper: Heterogeneous Carbonate Lithium Isotope Records
Across the end-Permian Mass Extinction Indicate a Highly PerturbedLithium Cycle in the Early Triassic by Kaitlin Taylor, Sofia Rauzi, Terry Isson, Daniel E. Ibarra, Dominik Hülse, Sara R. Kimmig, Jonathan L. Payne, Demir Altiner, Daniel J. Lehrmann, Boriana Kalderon-Asael, Noah J. Planavsky, and Kimberly V. Lau

Am J Sci 2026; 326:5 https://doi.org/10.2475/001c.156171

“Variations in Early Triassic carbonate lithium isotopes are hypothesized to reflect diagenetic alteration and a poorly mixed oceanic Li reservoir that developed from extensive reverse weathering.“

02/13/2026

New Paper: Carbon Isotope Trends of Precambrian-Cambrian Carbonates in Southwestern Laurentia Are Robust to Diagenetic Overprinting by Mary C. Lonsdale, Anne-Sofie C. Ahm, Lyle L. Nelson, Jacob W. Thompson, John A. Higgins, and Emily F. Smith

Am J Sci 2026; 326:4 https://doi.org/10.2475/001c.155346

“Carbon Isotope Trends of Precambrian-Cambrian Carbonates in Southwestern Laurentia are Robust to Diagenetic Overprinting.“

02/10/2026

New Paper: Permian Syn-Extensional Barrovian Metamorphism in the Envelope of a Migmatite Dome of the Mongolian Altai–Petrostructural and Geochronological Arguments by Luc de Hoÿm de Marien, Pavla Štípská, Karel Schulmann, Andrew Kylander-Clark, Ondrej Lexa, Yingde Jiang, Petr Jeřábek, Martin Racek, and David Buriánek

Am J Sci 2026; 326:3 https://doi.org/10.2475/001c.155605

“Petrochronology demonstrates that Barrovian metamorphism in the envelope of a Permian metamorphic core complex in the Mongolian Altai, previously considered a signature of crustal thickening, was instead produced during crustal thinning. “

01/21/2026

New Paper: From Source Rock to Cinnabar – How the Giant Mercury Deposits in Earth’s Crust Formed by L. Taras Bryndzia

Am J Sci 2026; 326:2 https://doi.org/10.2475/001c.147533

“This image shows the mass independent fraction (MIF) of mercury isotopes in cinnabar (HgS) from the largest deposits of Hg in Earth’s crust. Approximately 85% of all the cinnabar in these deposits has Hg MIF isotopic compositions that plot within ± 0.1 ‰ of the origin, similar to that of continental flood basalts (CFB; from the end-Permian early-Triassic Siberian Traps LIP). These data support an interpretation that most of the Hg in these giant cinnabar deposits likely had an upper mantle origin.”

01/05/2026

New Paper: A Basin in Transition: Ecological, Environmental,
and Tectonic Shifts Across the Ediacaran–Cambrian Boundary in the Nama Group, Kalahari Craton by Lyle L. Nelson, Emily F. Smith, Simon. A. F. Darroch, Iona Baillie, Jahandar Ramezani, John E. Almond, Roger Swart, Dana E. Polomski, Katherine A. Turk

Am J Sci 2026; 326:1 https://doi.org/10.2475/001c.151699

"New research on late Ediacaran–early Cambrian stratigraphy of Namibia’s Nama Group revises biostratigraphic and chemostratigraphic age models for the terminal Ediacaran and advances understanding of the Nama Foreland Basin."

10/17/2025

New Paper: Rare Earth Element-Mineralized Carbonatite in the Bear Lodge Alkaline Complex, USA—Ore Genesis Implications From Fluid Inclusion Characterization by Allen K. Andersen, Danielle A. Olinger, Mitchell M. Bennett
Am J Sci 2025; 325:13 https://doi.org/10.2475/001c.143992
"Study of fluid inclusions in carbonatite of the Bear Lodge Alkaline Complex, Wyoming shows that alkali bicarbonate-sulfate brines were integral to early, light rare earth element mineralization within carbonatite intrusions."

09/11/2025

New Paper: Balancing Redox Budgets: Mechanisms for Prolonging Anoxia During Major Carbon Burial Events by Sean M. Newby, Seth A. Young, Theodore R. Them II, Benjamin C. Gill, Jeremy D. Owens

Am J Sci 2025; 325:12 https://doi.org/10.2475/001c.143665

"Oceanic Anoxic Events likely produced excess oxygen from burial of reduced carbon and sulfur, but Large Igneous Province reductants and oxidative weathering may balance this to maintain marine anoxia."

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