Results 221 to 230 of about 123,572 (318)

Domed‐rim microbial polygons and their preservation potential

The Depositional Record, Volume 12, Issue 1, February 2026.
Microbially induced sedimentary structures (MISS) derive through interactions between minerals and microorganisms. We define a domed‐rim MISS, morphologically distinct from abiotic mud cracks and demonstrate its potential for long‐term preservation. These structures represent promising biosignatures in ancient environments on Earth and potentially Mars.
Franziska R. Blattmann, Timothy I. Eglinton, Negar Haghipour, Simon E. Rouwendaal, Stefano M. Bernasconi, John M. Rivers, Maria Dittrich, Zulfa Al Disi, Kenneth H. Williford, Fadhil Sadooni, Hamad A. Al‐Saad Al‐Kuwari, Tomaso R. R. Bontognali   +11 more
wiley   +1 more source

(Table 2) Radiocarbon ages of lake sediments from Boresø, East Greenland

, 2008
Ole Bennike, Mikkel Sørensen, Bent Fredskild, Bjarne H. Jacobsen, Jens Böcher, Susanne L. Amsinck, Erik Jeppesen, Claus Andreasen, Hanne H. Christiansen, Ole Humlum   +9 more
openalex   +1 more source

National Physical Laboratory Radiocarbon Measurements VI [PDF]

, 1969
W. J. Callow, G Hassall
openalex   +1 more source

Palaeoglacier reconstruction and dynamics of Cordillera Vilcanota in the tropical high Peruvian Andes

Earth Surface Processes and Landforms, Volume 51, Issue 2, February 2026.
We provide a geomorphological analysis of Cordillera Vilcanota and use morphostratigraphic principles to reconstruct palaeo icefield extent and palaeoglacier readvances, likely during the Antarctic Cold Reversal and Younger Dryas. We find evidence of temperate and polythermal ice margins, with limited glaciofluvial landform generation.
Bethan Davies, Tom Gribbin, Owen King, Tom Matthews, Jan R. Baiker, Wouter Buytaert, Jonathan Carrivick, Fabian Drenkhan, Juan‐Luis García, Nilton Montoya, L. Baker Perry, Jeremy Ely   +11 more
wiley   +1 more source

Investigating Query by Committee and Inverse‐Distance Based Exploration for Active Learning as Learning Strategies: An Application in Wood Dating

Quality and Reliability Engineering International, Volume 42, Issue 1, Page 66-79, February 2026.
ABSTRACT Fourier transform infrared (FTIR) spectroscopy, a non‐destructive method, is capable of measuring changes in the major wood components cellulose, hemicellulose and lignin during degradation. Previous research evaluated the application of supervised machine learning based on molecular decay over specific preservation conditions, achieving a ...
Karin Binder, Johannes Tintner‐Olifiers, Bernhard Spangl   +2 more
wiley   +1 more source

Orbital Variability in Grazing Proportion: New Insights From Sedimentary Amino Acid δ15N Records of the Western Equatorial Pacific

AGU Advances, Volume 7, Issue 1, February 2026.
Abstract The carbon sequestration capacity of the biological carbon pump (BCP) is determined by surface ocean carbon fixation and the transportation of fixed carbon to the ocean interior, which is closely linked to the trophic structure of planktonic ecosystem.
Chen Li, Haowen Dang, Jinlong Du, Hongliang Li, Jingjing Zhang, Zhimin Jian   +5 more
wiley   +1 more source

Shape Matters: Unlocking Transport Histories in Fine‐Grained Aeolian Sediments With Endmember Modeling of Size–Shape Distributions

Earth and Space Science, Volume 13, Issue 2, February 2026.
Abstract The transport medium, mode, energy, and distance are recorded in the grain‐size and grain‐shape distributions in a sedimentary deposit. While grain‐size analysis has long been used in sedimentology, grain‐shape analysis is increasingly recognized as a valuable tool for reconstructing sedimentary processes and palaeoenvironments.
P. P. Stark, M. A. Prins, C. J. Beets, H. Tang, R. T. van Balen, A. P. Kaakinen   +5 more
wiley   +1 more source

Seasonality in Marine Organic Carbon Export and Sequestration Pathways

Global Biogeochemical Cycles, Volume 40, Issue 2, February 2026.
Abstract The ocean's biological carbon pump transports organic carbon from the surface to depth via three main pathways: the gravitational sinking of particles, active transport by vertically migrating zooplankton, and mixing and advection of suspended and dissolved organic carbon.
Renjian Li, Tim DeVries, David A. Siegel, Francois W. Primeau   +3 more
wiley   +1 more source

Soil Organic Matter Stabilization by Polyvalent Cations in a Buried Alkaline Soil

Journal of Geophysical Research: Biogeosciences, Volume 131, Issue 2, February 2026.
Abstract Buried paleosols can store large quantities of organic carbon (C), much of which persists for millennia due to isolation from surface processes that promote decomposition. Subsoil organic matter (SOM) persistence is often enhanced by mineral associations and ionic conditions—particularly high clay content and polyvalent cations—that limit ...
Manisha Dolui, Teneille Nel, Stephanie Chacon, Laura M. Phillips, Abbygail R. McMurtry, Kimber Moreland, Karis McFarlane, Joseph A. Mason, Erika Marin‐Spiotta, Marie‐Anne de Graaff, Teamrat Ghezzehei, Asmeret Asefaw Berhe   +11 more
wiley   +1 more source

Reduced Antarctic Bottom Water overturning rate during the early last deglaciation inferred from radiocarbon records. [PDF]

Nat Commun
Gu S, Liu Z, Zhao N, Chen T, Yu J, Zhang J, He C, Chen S, Zhang Z, Li L, Jahn A.   +10 more
europepmc   +1 more source