Results 71 to 80 of about 2,338 (195)

Determining Magnetic Field Intensity and Direction From the Anisotropy of Magnetic Remanence in Sediments

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 4, April 2026.
Abstract Anisotropy of magnetic remanence (AMR) holds promise for quantifying relative paleointensity values from sedimentary rocks. A proof of concept was established for applied fields that exceeded the intensity of the geomagnetic field. Under Earth‐like fields, large uncertainties necessitate the development of a new approach to improve the ...
Felix K. Ostermeier, Stuart A. Gilder, Michael R. Wack, Josef Ježek, Kuang He, David Finn   +5 more
wiley   +1 more source

Late Eocene to Early Oligocene (36–26 Ma) Rock Magnetism and Magnetostratigraphy of IODP Site U1553, Southwestern Pacific: Defying the Challenges of Carbonate Dilution and Reductive Diagenesis

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 4, April 2026.
Abstract The late Eocene to early Oligocene is an intriguing Paleogene period in which the Earth climate state changed from Warmhouse to Coolhouse. Accurate age models are essential for investigating these climate transitions. The southwestern Pacific International Ocean Discovery Program (IODP) Site U1553, with its almost complete succession of the ...
Yang Zhang, Wanzhang Wang, Tilo von Dobeneck, Anna Joy Drury, Thomas Frederichs, Wei Yuan   +5 more
wiley   +1 more source

Time‐Asymmetric FORC Diagrams: A New Protocol for Visualizing Thermal Fluctuations and Distinguishing Magnetic Mineral Mixtures

Geochemistry, Geophysics, Geosystems, 2018
First‐order reversal curves (FORCs) are nowadays routinely used to assess domain states and magnetostatic interactions of magnetic minerals. While a huge step forward from bulk magnetic measurements in terms of sample characterization, there is a missing
Thomas A. Berndt, Liao Chang, Shishun Wang, Sijibomioluwa Badejo   +3 more
doaj   +1 more source

Sensitivity of sediment magnetic records to climate change during Holocene for the northern South China Sea

Frontiers in Earth Science, 2016
Magnetic property has been proved to be a sensitive proxy to climate change for both terrestrial and marine sediments. Based on the schedule frame established by AMS 14C dating of foraminifera, detail magnetic analyses were performed for core PC24 ...
Tingping eOuyang, Tingping eOuyang, Mingkun eLi, Mingkun eLi, Xiang eZhao, Zhaoyu eZhu, Chengjing eTian, Chengjing eTian, Yan eQiu, Xuechao ePeng, Qiao eHu   +10 more
doaj   +1 more source

Biogenic Magnetite Nanoparticles

, 2020
Magnetite is widely used in various area including recording material, cancer treatment, magnetic resonance imaging, magnetic probes, detection of pathogens etc. The rocks and magnetofossils are the major source of magnetite. Magnetite may be synthesized
Shampa Sen, Rajendran Kumar
core  

A Biologically‐Architected Wear and Damage‐Resistant Nanoparticle Coating From the Radular Teeth of Cryptochiton stelleri

Advanced Functional Materials, Volume 36, Issue 20, 9 March 2026.
The ultrahard teeth of mollusks that feed on rocky substrates contain a wear‐resistant coating on their surfaces consisting of densely packed mesocrystalline magnetic nanoparticles within an organic matrix. These coatings display significant hardness and toughness through their highly controlled mesocrystalline architectures.
Taifeng Wang, Yu Chen, Ezra Sarmiento, Taige Hao, Atsushi Arakaki, Michiko Nemoto, Pablo Zavattieri, David Kisailus   +7 more
wiley   +1 more source

Life on a Mesoarchean marine shelf – insights from the world’s oldest known granular iron formation

Scientific Reports, 2020
The Nconga Formation of the Mesoarchean (~2.96–2.84 Ga) Mozaan Group of the Pongola Supergroup of southern Africa contains the world’s oldest known granular iron formation.
Albertus J. B. Smith, Nicolas J. Beukes, Jens Gutzmer, Clark M. Johnson, Andrew D. Czaja, Noah Nhleko, Frikkie de Beer, Jakobus W. Hoffman, Stanley M. Awramik   +8 more
doaj   +1 more source

Microstratigraphy and Site Formation Processes at Quebrada Jaguay 280 (Peru)

Geoarchaeology, Volume 41, Issue 2, March/April 2026.
ABSTRACT This study presents a microanalytical, geoarchaeological study of Quebrada Jaguay (QJ)‐280, a Terminal Pleistocene–Holocene coastal site in southern Peru. Combining micromorphology, µXRF and µFTIR, we develop a site formation model that also reassesses site use and forager behaviour.
Sarah A. Meinekat, Emily B. P. Milton, Daniela P. Osorio, Susan M. Mentzer, Christopher E. Miller, Daniel H. Sandweiss, Kurt Rademaker   +6 more
wiley   +1 more source

Global Comparison of Aqueous Geochemistry and Dissolved H2/CH4 in Continental Low Temperature Serpentinization–Influenced Environments

Hydrological Processes, Volume 40, Issue 3, March 2026.
Conceptual diagram of hydrological and geochemical processes within the Santa Elena Ophiolite, Costa Rica. It highlights watershed cross‐sections, soil genesis, hyperalkaline Type II waters (pH > 11.6) with calcite crust and trapped H2/CH4 gases, seepage into surface waters, storm‐impacted stream profiles, weathered vs.
Alexandra May, Ricardo Sánchez‐Murillo, Matthew O. Schrenk, Esteban Gazel, J. Maarten de Moor, Christian Birkel, Xiaoqiang Li, Danelle Carr, María Marta Chavarría   +8 more
wiley   +1 more source

Unmixing biogenic and terrigenous magnetic mineral components in red clay of the Pacific Ocean using principal component analyses of first-order reversal curve diagrams and paleoenvironmental implications

Earth, Planets and Space, 2020
Red clay widely occupies the seafloor of pelagic environments in middle latitudes, and potentially preserves long paleoceanographic records. We conducted a rock-magnetic study of Pacific Ocean red clay to elucidate paleoenvironmental changes.
Toshitsugu Yamazaki, Wei Fu, Takaya Shimono, Yoichi Usui   +3 more
doaj   +1 more source