Results 51 to 60 of about 3,279 (186)

Origin of carbonate-silicate rocks of the Porya Guba (the Lapland-Kolvitsa Granulite Belt) revealed by stable isotope analysis (δ18O, δ13C)

Записки Горного института
Carbonate-silicate rocks of unclear origin have been observed in granulites of the Porya Guba of the Lapland-Kolvitsa Belt within the Fennoscandinavian Shield.
Dmitrii P. Krylov, Ekaterina V. Klimova
doaj  

Geochemical characterization of Gubanovskaya intrusion of rapakivi granites (Wiborg massif)

Vestnik MGTU
The paper presents new data on geology and composition of rapakivi granites of Gubanovskaya intrusion (Wiborg massif). Petrographic and geochemical characteristics of rapakivi granites of the second (ovoid) and third (trachytoid) phases of intrusion, as ...
Rogova I. V., Skublov S. G., Berezin A. V., Petrov D. A.   +3 more
doaj   +1 more source

A new method for amino acid geochronology of the shell of the bivalve mollusc Arctica islandica [PDF]

Geochronology
The bivalve mollusc Arctica islandica can live for hundreds of years, and its shell has provided a valuable resource for sclerochronological studies and geochemical analyses for understanding palaeoenvironmental change. Shell specimens recovered from the
M. L. G. Conti, P. G. Butler, D. J. Reynolds, T. Trofimova, J. D. Scourse, K. E. H. Penkman   +5 more
doaj   +1 more source

An optimization tool for identifying multiple-diffusion domain model parameters [PDF]

Geochronology
The multiple-diffusion domain (MDD) model empirically describes the diffusive behavior of noble gases in some terrestrial materials and has been commonly used to interpret 40Ar/39Ar stepwise degassing observations in K-feldspar.
A. L. Gorin, A. L. Gorin, J. M. Gorin, M. Bergelin, D. L. Shuster, D. L. Shuster   +5 more
doaj  

Trace element composition of silicate minerals from Kunashak Meteorite (L6)

Записки Горного института
Major (EPMA) and trace (SIMS) element geochemistry in the silicate minerals (olivine, pyroxene and plagioclase) of Kunashak equilibrated ordinary chondrite (L6) is described. No variations in the major element concentrations of the silicate minerals have
Kristina G. Sukhanova, Olga L. Galankina
doaj  

Short communication: Nanoscale heterogeneity of U and Pb in baddeleyite from atom probe tomography – ²³⁸U series alpha recoil effects and U atom clustering [PDF]

Geochronology
Atom probe tomography (APT) of 238U and 206Pb has been applied to baddeleyite crystals from the Hart Dolerite (1791±1 Ma) and the Great Dyke of Mauritania (2732±2 Ma) in an effort to constrain the average nuclear recoil distance of 238U series daughter ...
S. Denyszyn, D. W. Davis, D. Fougerouse
doaj   +1 more source

Early Cretaceous trachytes and basement rocks from northeastern Mongolia: a Sr-Nd-Pb isotope study

Frontiers in Earth Science, 2023
Maksim V. Kuznetsov, Valery M. Savatenkov, Valery M. Savatenkov, Thomas C. Sheldrick, Lidiya V. Shpakovich   +4 more
doaj   +1 more source

Lithostratigraphy of the Lower Cretaceous of Southwestern and Central Crimea

Russian Journal of Earth Sciences
The revision and updating of the local geological units of the Lower Cretaceous in the Southwestern and Central Crimea have been carried out. For this purpose, the materials presented in numerous publications and the results obtained by the authors ...
Dubkova K. A., Shishlov S. B., Kolbanova A. V.   +2 more
doaj   +1 more source

Assessment and Correction of Non‐Linearity Effects for In Situ Rb‐Sr Geochronology Applied to High 87Rb/86Sr Mica

Geostandards and Geoanalytical Research, Volume 50, Issue 3, Page 601-624, September 2026.
Key Points Measurement of 86Sr at count rates < 1500 cps can result in statistical bias. Non‐linear signals in analogue detection mode (e.g., Rb) present a challenge for accurately dating high 87Rb/86Sr mica (> 1000). Accounting for these considerations, high 87Rb/86Sr mica are dated here with accuracies of ∼ 1%.
Duane C. Petts, William J. Davis, Simon E. Jackson, Jamie A. Cutts, Janina Czas, Alfredo Camacho   +5 more
wiley   +1 more source

Resolving Micrometre‐Scale Zircon Growth in Silicic Systems by 7 μm LA‐MC‐ICP‐MS U‐Pb Dating: Linking Petrology and Geochronology in Silicic Volcanic and Granitic Rocks from Victoria, Australia

Geostandards and Geoanalytical Research, Volume 50, Issue 3, Page 625-647, September 2026.
Key Points 7 μm spot‐diameter LA‐MC‐ICP‐MS analyses yield accurate zircon U‐Pb ages. 1013 Ω amplifier resistors improve low‐signal Pb measurements. Saturn correction protocols minimise down‐hole fractionation effects. We present a systematic evaluation of high spatial‐resolution zircon U‐Pb dating using a Thermo Scientific Neoma multi‐collector ICP‐MS ...
Cristiano Lana, John D. Clemens
wiley   +1 more source