Results 61 to 70 of about 380 (177)

Cosmic Dust Flux During the Quaternary: The Record of Large Scoriaceous and Unmelted Micrometeorites From the Transantarctic Mountains Collection

Journal of Geophysical Research: Planets, Volume 131, Issue 7, July 2026.
Abstract We estimate the cosmic dust flux to Earth through the study of rare micrometeorites that preserve part of their precursor features during atmospheric entry heating, namely unmelted and scoriaceous subtypes. Combining high‐precision mass balance measurements, X‐ray computed microtomography and scanning electron microscopy, we studied mass, size
S. Ottaviani, L. Folco, M. D. Suttle, R. Repič, L. Mancini, T. Battiston, S. Iannini Lelarge, M. Masotta   +7 more
wiley   +1 more source

The age of fossil StW573 (‘Little Foot’): An alternative interpretation of 26Al/10Be burial data

South African Journal of Science, 2017
Following the publication (Granger DE et al., Nature 2015;522:85–88) of an 26Al/10Be burial isochron age of 3.67±0.16 Ma for the sediments encasing hominin fossil StW573 (‘Little Foot’), we consider data on chert samples presented in that publication to ...
Jan D. Kramers, Paul H.G.M. Dirks
doaj   +1 more source

Weichselian history of the Fennoscandian Ice Sheet centre, Kvarken archipelago, western Finland—flow shifts, thermal regime and deglaciation

Boreas, Volume 55, Issue 3, Page 670-701, July 2026.
Rapid thaw of the Earth's cryosphere in response to anthropogenic warming highlights the need to identify and understand the contrasting signatures of past ice‐sheet stability and collapse. The Kvarken archipelago, western Finland, at the centre of the former Fennoscandian Ice Sheet (FIS), has been designated a UNESCO World Heritage site in recognition
Niko Putkinen, Tapani Tervo, Adrian M. Hall, Juha P. Lunkka, Pertti Sarala, Olli Breilin, Jari Nenonen   +6 more
wiley   +1 more source

A Mountain Glacier Perspective on the Bipolar Seesaw

Geophysical Research Letters, Volume 53, Issue 12, 28 June 2026.
Abstract A global record of mountain glacier terminations during the last deglaciation (∼19–11 ka) dated by a large, uncurated data set of cosmogenic‐nuclide exposure ages highlights a statistically significant asynchrony in termination ages between the Northern and Southern Hemispheres.
Joseph P. Tulenko, Greg Balco
wiley   +1 more source

Reduced West Antarctic Ice Sheet Size During Prominent Quaternary Interglacials Constrained by Iceberg‐Rafted Debris Provenance in the Amundsen Sea

Geophysical Research Letters, Volume 53, Issue 12, 28 June 2026.
Abstract The stability of the West Antarctic Ice Sheet (WAIS) remains a major uncertainty in sea‐level projections, and geologic records provide important constraints on its past behavior. We present 40Ar/39Ar ages of biotite and hornblende grains from iceberg‐rafted debris (IRD) in two Amundsen Sea sediment cores (PC493 and PS58/254), located south ...
Patric Simões Pereira, Claus‐Dieter Hillenbrand, Sidney R. Hemming, James W. Marschalek, Rob Larter, James A. Smith, Gerhard Kuhn, Tina van de Flierdt   +7 more
wiley   +1 more source

Cosmogenic nuclide analysis [PDF]

, 2013
Cosmogenic nuclides can be used to directly determine the timing of events and rates of change in the Earth’s surface by measuring their production due to cosmic ray-induced reactions in rocks and sediment. The technique has been widely adopted by the geomorphological community because it can be used on a wide range of landforms across an age range ...
openaire   +2 more sources

Build-up and chronology of blue ice moraines in Queen Maud Land, Antarctica

Quaternary Science Advances, 2020
Blue ice moraines are common supraglacial landforms in Antarctica and they are considered to record the ice volume fluctuations. In this study, we use photogrammetry and the analysis of multiple cosmogenic nuclides (10Be, 26Al, and in-situ 14C) in ...
Naki Akçar, Serdar Yeşilyurt, Kristina Hippe, Marcus Christl, Christof Vockenhuber, Vural Yavuz, Burcu Özsoy   +6 more
doaj   +1 more source

Nuclear Data from AMS & Nuclear Data for AMS – some examples

EPJ Web of Conferences, 2012
We summarize some recent cross-section measurements using accelerator mass spectrometry (AMS). AMS represents an ultra-sensitive technique for measuring a limited, but steadily increasing number of longer-lived radionuclides.
Semkova V., Plompen A., Steier P., Priller A., Lederer C., Mengoni A., Paul M., Krasa A., Kutschera W., Klix A., Korschinek G., Käppeler F., Dillmann I., Golser R., Forstner O., Buczak K., Bichler M., Belgya T., Wallner A.   +18 more
doaj   +1 more source

Predicting the production rates of cosmogenic nuclides [PDF]

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 2000
Abstract The determination and some uses of production rates of cosmogenic nuclides are reviewed. Emphasis is on work done since 1993 for long-lived cosmogenic radionuclides in extraterrestrial matter. Several Monte Carlo computer codes are being used to numerically simulate the interactions and transport of cosmic-ray particles.
openaire   +1 more source

The last deglaciation of Peru and Bolivia

Cuadernos de Investigación Geográfica, 2017
The tropical Andes of Peru and Bolivia are important for preserving geomorphic evidence of multiple glaciations, allowing for refinements of chronology to aid in understanding climate dynamics at a key location between hemispheres. This review focuses on
B. Mark, N. Stansell, G. Zeballos
doaj   +1 more source