Results 41 to 50 of about 45,144 (177)

Deciphering Pleistocene Fault Activity in the Eastern Alps: Dating Fault Gouges With Electron Spin Resonance and Optically Stimulated Luminescence

Tectonics, Volume 44, Issue 8, August 2025.
Abstract The Eastern Alps have been influenced by post‐collisional indentation tectonics since the Miocene. Currently, Adria‐Europe convergence, albeit slow, is accommodated and distributed across several faults. The seismogenic potential of some of these faults is unclear. We applied optically stimulated luminescence (OSL) and electron spin resonance (
E. Prince, S. Tsukamoto, C. Grützner, M. Bülhoff, K. Ustaszewski   +4 more
wiley   +1 more source

A feasibility assessment of micromill sampling for Rb‐Sr and Sm‐Nd geochronology of shergottites

Meteoritics &Planetary Science, Volume 60, Issue 8, Page 1814-1834, August 2025.
Abstract Accurate dating of Martian meteorites is crucial for understanding key events in the planet's evolution. However, not all Martian meteorites are amenable to dating techniques currently in use for these rocks. The priority of sample preservation precludes mineral separation methods for low‐volume specimens, whereas the less destructive in situ ...
A. I. Sheen, C. D. K. Herd, K. T. Tait
wiley   +1 more source

Barium isotopic composition of mainstream silicon carbides from Murchison : constraints for s-process nucleosynthesis in asymptotic giant branch stars [PDF]

, 2014
We present barium, carbon, and silicon isotopic compositions of 38 acid-cleaned presolar SiC grains from Murchison. Comparison with previous data shows that acid washing is highly effective in removing barium contamination.
Bisterzo, Sara, Cristallo, Sergio, Dauphas, Nicolas, Davis, Andrew M., Gallino, Roberto, Gyngard, Frank, Herwig, Falk, Liu, Nan, Pellin, Michael J., Pellin, Michael Joseph, Pignatari, Marco, Savina, Michael, Savina, Michael R., Straniero, Oscar, Willingham, David, Willingham, David G.   +15 more
core   +3 more sources

Near Steady Late Pleistocene Tropical Denudation Rates in SW Madagascar

Journal of Geophysical Research: Earth Surface, Volume 130, Issue 7, July 2025.
Abstract Denudation is a key parameter controlling the evolution of the Earth's surface, the production of soils, the stability of relief, or the long‐term evolution of climate. Climate fluctuations conversely have a strong impact on denudation, but these complex feedback mechanisms are still under‐constrained.
Etienne Large, Julien Charreau, Pierre‐Henri Blard, Germain Bayon, Eduardo Garzanti, Bernard Dennielou, Gwenaël Jouet, Natalia Vazquez Riveiros, Jacques Giraudeau, Laurie Reisberg, Aimeryc Shcumacher, Alfred Andriamamonjy, Amos Fety Michel Rakotondrazafy   +12 more
wiley   +1 more source

U-Pb chronology of the Solar System's oldest solids with variable 238 U/ 235 U

, 2016
Accurate determination of the absolute ages of the oldest Solar System objects - chondrules and Ca-Al-rich inclusions (CAIs), requires knowledge of their 238U/235U ratios.
Amelin, Yuri, Iizuka, Tsuyoshi, Ireland, Trevor, Jacobsen, Stein, Kaltenbach, Angela, Petaev, Michail, Stirling, Claudine H   +6 more
core   +1 more source

Lateglacial and Holocene glacier variations in an active volcanic area, northern Jan Mayen (Nord‐Jan), Norway

Boreas, Volume 54, Issue 3, Page 305-327, July 2025.
Glacier evolution and environmental changes in the northern Jan‐Mayen from the early deglaciation and well into the Holocene are discussed. Results are based on a large chronological dataset (TCN and radiocarbon dates), integrated with field data on glacial landforms and sediments, including the use of GPR.
Astrid Lyså, Eiliv A. Larsen, Johanna Anjar, Naki Akçar, Asbjørn Hiksdal, Georgios Tassis   +5 more
wiley   +1 more source

Erosion rate study at the Allchar deposit (Macedonia) based on radioactive and stable cosmogenic nuclides (26Al, 36Cl, 3He, and 21Ne) [PDF]

, 2015
This paper focuses on constraining the erosion rate in the area of the Allchar Sb-As-Tl-Au deposit (Macedonia). It contains the largest known reserves of lorandite (TlAsS2), which is essential for the LORanditeEXperiment (LOREX), aimed at determining the
Pavicevic, M.K., Cvetkovic, Vladica, Niedermann, Samuel, Pejovic, Vladan, Amthauer, Georg, Boev, Blazo, Bosch, Fritz, Anicin, Ivan, Henning, Walter   +8 more
core   +1 more source

Role of Magma Ocean Differentiation in the Formation and Long‐Term Preservation of Distinct Geochemical Domains Within the Deep Mantle

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 5, May 2025.
Abstract We modeled the evolution of the terrestrial Magma Ocean using the short‐lived 182Hf‐182W isotope system (t1/2 = 8.9 Myr) in a multi‐reservoir early Earth. We start with a chondritic Earth at T0 = 4.567 Ga. Core segregates and attains its present‐day mass, W elemental and isotopic (182W/184W) composition by the end of core formation (TCF).
Seema Kumari, Ramananda Chakrabarti
wiley   +1 more source

Hydration and dehydration of CM chondrites revealed by X‐ray diffraction combined with textural observations and compositional data

Meteoritics &Planetary Science, Volume 60, Issue 5, Page 1194-1215, May 2025.
Abstract The in‐plane rotation method is used to obtain X‐ray random diffraction (XRD) patterns of polished thin sections of 10 CM chondrites. The samples include five intermediately altered CM chondrites with subtypes 2.6–2.3, two heavily altered CM chondrites with subtype 2.0 and three with secondary heating after hydration (Y 980036, Y 980051, and ...
Naoya Imae, Makoto Kimura, Akira Yamaguchi   +2 more
wiley   +1 more source

Mars ejection times and neutron capture effects of the nakhlites Y000593 and Y000749, the olivine-phyric shergottite Y980459, and the lherzolite NWA1950 [PDF]

, 2005
We measured the concentrations and isotopic composition of the noble gases He, Ne, Ar, Kr, and Xe in the paired antarctic nakhlites Y000593 and Y000749, and in the antarctic olivine-phyric shergottite Y980459.
Busemann,Henner, Christen,Franziska, Eugster,Otto   +2 more
core   +1 more source