Results 31 to 40 of about 380 (177)

Cosmogenic Nuclides in Ice Sheets [PDF]

Radiocarbon, 1992
We discuss the nature of the twofold record of cosmogenic nuclides in ice sheets, of nuclei produced in the atmosphere, and of nuclei produced in situ due to interactions of cosmic-ray particles with oxygen nuclei in ice. We show that a wealth of geophysical information, in principle, can be derived from a suitable combination of nuclides in ice ...
Devendra Lal, A. J. T. Jull
openaire   +1 more source

Case studies of three geological archives for rare radionuclide measurements using accelerator mass spectrometry

Frontiers in Environmental Chemistry
Long-lived radionuclides in our environment provide important information on natural and anthropogenic processes. Their presence and concentration reflect the balance of production and decay.
Sebastian Fichter, Dominik Koll, Dominik Koll, Dominik Koll, Annabel Rolofs, Annabel Rolofs, Anton Wallner, Anton Wallner   +7 more
doaj   +1 more source

Dating of Caves by Cosmogenic Nuclides: Method, Possibilities, and the Siebenhengste Example

Acta Carsologica, 2016
Kozmični žarki povzročajo nastanek kozmogenih nuklidov na površini zemlje in tik pod njo. Za datiranje jamskih sedimentov sta posebej pomembna 10Be in 26Al, ki nastajata v kremenu.
Philipp Häuselmann, Darryl E. Granger
doaj   +1 more source

Geochronological reconstruction of the Lateglacial deglaciation in the Arve Valley (Northern French Alps)

Journal of Quaternary Science, EarlyView.
ABSTRACT The timing and spatial patterns of glaciers retreat in the Northern French Alps during the Lateglacial (19.0–11.7 ka) remain debated, reflecting discrepancies among available chronological data sets. The complex interactions between major glaciers, such as the Rhône and Arve glaciers to the north and the Isère glacier to the south, represent a
Quentin Portal, Christian Crouzet, Jean‐François Buoncristiani, Julien Carcaillet   +3 more
wiley   +1 more source

Regional Differences in Carbon-14 Data of the 993 CE Cosmic Ray Event

Frontiers in Astronomy and Space Sciences, 2022
Cosmogenic nuclides such as 14C from tree rings and 10Be and 36Cl from ice cores are excellent proxies for the past extremely large solar energetic particle (SEP) events, which are dozens of times larger than the largest SEP event in the history of ...
Fusa Miyake, Masataka Hakozaki, Katsuhiko Kimura, Fuyuki Tokanai, Toshio Nakamura, Mirei Takeyama, Toru Moriya   +6 more
doaj   +1 more source

Decoupling glacier retreat and surface stabilization on the Snežnik Plateau (Slovenia), insights from in situ cosmogenic 36Cl exposure and depth‐profile ages

Journal of Quaternary Science, EarlyView.
ABSTRACT Glaciokarst landscapes pose distinctive challenges for cosmogenic dating because meltwater and runoff can be rapidly rerouted into ponors and conduit networks, weakening glacier–river coupling and promoting local sediment storage. We reconstruct glacier retreat and postglacial stabilization on the Snežnik Plateau (SW Slovenia) using in situ ...
Onur Altınay, Mehmet Akif Sarıkaya, Uroš Stepišnik, Manja Žebre, Cengiz Yıldırım, Attila Çiner, Klaus M. Wilcken   +6 more
wiley   +1 more source

The 40K‐K dating system: 1. Improving data interpretation using new model calculations

Meteoritics &Planetary Science, EarlyView.
Abstract The 40K‐K cosmic‐ray exposure (CRE) dating system offers a promising method for determining exposure ages of iron meteorites by combining the radioactive cosmogenic 40K with the stable cosmogenic isotopes 39K and 41K. However, earlier applications relied on semi‐empirical production models and inconsistent analytical data sets, limiting their ...
Farshid Nozarian, Suzette Timmerman, Ingo Leya   +2 more
wiley   +1 more source

Quantifying sediment discharge from the Bolivian Andes into the Beni foreland basin from cosmogenic 10Be-derived denudation rates

Brazilian Journal of Geology
: Enormous volumes of sediment are produced in the Central Andes and are then delivered into the foreland basins of Amazon basin tributaries. While cosmogenic nuclides in sediment are a suitable tool to measure the denudation rates of sediment-producing ...
Hella Wittmann, Friedhelm von Blanckenburg, Jean-Loup Guyot, Laurence Maurice, Peter Kubik   +4 more
doaj   +1 more source

Characterization of coesite‐bearing impact melt glass from the Hapcheon crater, Korea: Trimodal phase architecture, shock metamorphism, and implications for 40Ar/39Ar geochronology

Meteoritics &Planetary Science, EarlyView.
Abstract We present the first micrometer‐scale, phase‐resolved compositional characterization of impact melt glass from the Hapcheon crater (~1.4 km apparent diameter), the first confirmed impact structure on the Korean Peninsula, integrating EPMA‐WDS (5 μm spot), confocal Raman spectroscopy (<1 μm spot), XRD, and 40Ar/39Ar step‐heating geochronology ...
Jin‐Young Lee, Jeongmin Kim, Sei‐Sun Hong   +2 more
wiley   +1 more source

Inferring the timing of abandonment of aggraded alluvial surfaces dated with cosmogenic nuclides [PDF]

Earth Surface Dynamics, 2019
Information about past climate, tectonics, and landscape evolution is often obtained by dating geomorphic surfaces comprising deposited or aggraded material, e.g. fluvial fill terraces, alluvial fans, volcanic flows, or glacial till.
M. K. D'Arcy, M. K. D'Arcy, T. F. Schildgen, T. F. Schildgen, J. M. Turowski, P. DiNezio   +5 more
doaj   +1 more source