Results 81 to 90 of about 4,093 (226)

A temporal control on the isotopic compositions of the Antarctic Peninsula arc

Communications Earth & Environment
Radiogenic isotopic compositions of arc magmas are a key tool for studying active margin evolution. They have two isotopic end-members: melts formed mostly from juvenile asthenosphere and melts sourced from evolved continental crust/continental ...
Joaquin Bastias-Silva, Alex Burton-Johnson, David Chew, Teal Riley, Wuidad Jara, Massimo Chiaradia   +5 more
doaj   +1 more source

Pb isotope geochemistry and reappraisal of Sr-Nd isotopes of the Cerro Morado basic magmatism (Ischigualasto-Villa Union Triassic basin, NW Argentina): Implications for the mantle sources

Brazilian Journal of Geology
: Sr-Nd-Pb isotopic signatures were determined for silica-undersaturated hypabyssal alkaline basic rocks of the Los Baldecitos Formation in the Cerro Morado area, situated in the Ischigualasto - Vale de la Luna Provincial Park (northernmost San Juan ...
Carlos Augusto Sommer, Carla Joana S. Barreto, Jean Michel Lafon, Evandro Fernandes de Lima, Felipe Marcelo Alexandre, Farid Chemale Jr., Edinei Koester   +6 more
doaj   +1 more source

Calcium and Multi‐Isotope Constraints on Cation Exchange in Groundwater

Water Resources Research, Volume 62, Issue 6, June 2026.
Abstract Cation exchange is one of the most important processes in water‐rock interaction in the presence of clay minerals, with a common Ca‐Mg‐Na exchange system. However, systematic verification of Ca isotopes for tracing cation exchange in natural environments is lacking due to overlapping factors, such as dissolution‐precipitation of Ca‐minerals ...
Tianming Huang, Yin Long, Zhenbin Li, Lanping Feng, Yajing Zhao, Yiman Li, Wenjing Liu, Zhifang Xu, Shengwen Qi, Zhonghe Pang   +9 more
wiley   +1 more source

Crustal Architecture of the Paleo‐Pacific Rift Margin of East Antarctica: Evidence From U‐Pb Ages and O‐Hf Isotope Compositions of Ross Orogen Granitoids

Geochemistry, Geophysics, Geosystems
Granitic batholiths of the ∼500 Ma Ross Orogen in Antarctica are voluminous in scale, reflecting prolific magmatism along the active early Paleozoic convergent margin of Gondwana.
John W. Goodge, C. Mark Fanning, Christopher M. Fisher, Jeffrey D. Vervoort   +3 more
doaj   +1 more source

A heterogeneous subcontinental mantle under the African-Arabian Plate boundary revealed by boron and radiogenic isotopes. [PDF]

Sci Rep, 2021
Agostini S, Di Giuseppe P, Manetti P, Doglioni C, Conticelli S.   +4 more
europepmc   +1 more source

Zooming into the Mediterranean outflow fossil moat during the 1.2–1.8 million years period (Early-Pleistocene): an approach by radiogenic and stable isotopes

, 2015
The fossil Alvarez Cabral erosive Moat contains hemipelagite, contourite and turbidite facies where oceanography changes in the Mediterranean outflow are archived over the 1.2-1.8 Myr time period. Here we used Pb and Sr radiogenic isotopes to trace water
Antón López, Laura Ángela, Barrado, Ana Isabel, Fernández Díaz, Marta, Yllera de Llano, Abel, Reguera García, M. Isabel, Conde Vilda, Estefanía, Martín Lebreiro, Susana   +6 more
core   +1 more source

Oxygen Isotopes and Volatiles in Martian Meteorite [PDF]

, 2013
Oxygen isotopes were measured in mineral separates from martian meteorites using laser fluorination and were found to be remarkably uniform in both δ18O and Δ17O, suggesting that martian magmas did not assimilate aqueously altered crust regardless of any
Channon, Melanie Beth
core   +1 more source

Long‐Term Deformation in the Alpine‐Provence Foreland Constrained by In Situ Calcite U‐Pb Dating

Tectonics, Volume 45, Issue 6, June 2026.
Abstract The evolution of the Alpine‐Provence foreland is characterized by multiple deformation phases since the Mesozoic, representing successive compressional and extensional episodes. The precise timing and spatial evolution of these deformation phases remain poorly constrained due to the lack of absolute geochronological data. Here, we present U–Pb
Dorian Bienveignant, Stéphane Schwartz, Matthias Bernet, Yann Rolland, Julien Léger, Adrien Vezinet, Nordine Bouden, Clara Boullerne, Jerome Nomade, Louise Boschetti, Thierry Dumont, Mélanie Balvay, Perach Nuriel   +12 more
wiley   +1 more source

Magnesium Isotopes as a Tracer of Crustal Materials in Volcanic Arc Magmas in the Northern Cascade Arc

Frontiers in Earth Science, 2018
Fifteen North Cascade Arc basalts and andesites were analyzed for Mg isotopes to investigate the extent and manner of crustal contributions to this magmatic system.
Aaron W. Brewer, Aaron W. Brewer, Fang-Zhen Teng, Emily Mullen   +3 more
doaj   +1 more source

Peixe Zircon as a Quality Control Reference Material in U‐Pb Geochronology by LA‐ICP‐MS

Geostandards and Geoanalytical Research, Volume 50, Issue 2, Page 369-389, June 2026.
Key Points Peixe#0 zircon was characterised for U‐Pb geochronology using CA‐ID‐TIMS, SIMS and a long‐term LA‐ICP‐MS data set. The consistent results establish Peixe#0 as a reference material for U‐Pb quality control. Trace element heterogeneity requires careful, CL‐guided spot selection.
Margareth Sugano Navarro, Erica Martini Tonetto, Elson P. Oliveira, Mauricio Ibañez‐Mejia, Cristina Talavera, Neal J. McNaughton, Jacinta Enzweiler, Michael Wiedenbeck   +7 more
wiley   +1 more source