scholarly journals Surface exposure dating using in situ cosmogenic 10Be

2004 ◽  
Vol 53 (1) ◽  
pp. 3
Author(s):  
U Abramowski ◽  
B Glaser ◽  
P W Kubik ◽  
R Zech ◽  
W Zech
Keyword(s):  
Surface Exposure Dating ◽  
Exposure Dating ◽  
Cosmogenic 10Be

Surface exposure dating by in-situ produced cosmogenic nuclides: chemical mineral separation of purified quartz

2001 ◽  
Vol 89 (11-12) ◽  
Author(s):  
M. Altmaier ◽  
W. Klas ◽  
U. Herpers
Keyword(s):  
Cosmic Radiation ◽  
Cosmogenic Nuclides ◽  
Surface Exposure Dating ◽  
Exposure Dating ◽  
Mineral Separation

The interaction of cosmic radiation with terrestrial matter leads to the

Cosmogenic Be-10 surface exposure data from the Sub-Antarctic Kerguelen Archipelago

2020 ◽  
Author(s):  
Henriette Linge ◽  
Jostein Bakke ◽  
Talin Tuestad ◽  
Philip Deline ◽  
Ludovic Ravanel ◽  
...  
Keyword(s):  
Hydrothermal Fluids ◽  
Large Igneous Province ◽  
Geochemical Composition ◽  
Surface Exposure Dating ◽  
Exposure Dating ◽  
Ice Cap ◽  
Wide Range ◽  
Exposure Ages ◽  
Kerguelen Archipelago

<p>The Kerguelen archipelago (around 49°S 69°E) is the emerged part of the Kerguelen Plateau, a large igneous province in the southwestern Indian Ocean. Information on past climatic and environmental conditions in the region is vital for understanding the past behaviour of the southern westerly winds. The cross-disciplinary project SOUTHSPERE seeks to investigate past variations in this weather system through reconstruction of temporal and spatial glacier variability from lake records and glacial landforms N and NE of the Cook Ice Cap. Reliable and accurate chronological control is crucial in this context.</p><p>Surface exposure dating of glacial geomorphological features S and SE of the Cook Ice Cap has previously been done using in situcosmogenic Cl-36 [1, 2]. Solifluction and gelifraction processes appear very active in our field area, as do aeolian erosion. Also, highly variable geochemical composition of the basalts and associated intrusions, as well as the degree and type of metamorphosis, lead to strong lithology-dependant weathering and erosion rates, as evident from differential weathering reliefs on cm and m scales. The very active surface environment constitutes a challenge for obtaining accurate surface exposure ages.</p><p>In the NW part of the archipelago, basaltic lava units altered by meteoric-hydrothermal fluids contain a wide variety of secondary silicate and carbonate minerals [3]. In settings where quartz-filled geodes and fractures in the basalt are located in favourable positions on bedrock and boulder surfaces, analysis of Be-10 in euhedral and microcrystalline quartz offers a means of validating in situ Cl-36 surface exposure ages. Moreover, multi-nuclide analysis would open up for a wide range of process and landscape development studies on this young archipelago. Percolation of hydrothermal fluids in fractures and geodes is probably related to the intrusion of younger (15-5 Ma) subvolcanic rocks [see 3 and references therein]. A meteoric source of the fluids would imply that the secondary silicates contain meteoric Be-10. As meteoric production is greater than in situ production, this may represent a problem for utilising in situ Be-10 for surface exposure dating. If secondary silicate formation occurred early, rather than late in the intrusive phase, complete radioactive decay of the meteoric Be-10 component is expected prior to surface exposure.</p><p>110 rock samples were collected for surface exposure dating with in situ cosmogenic nuclides during a field campaign in November and December 2019. Here we present the first Be-10 data from rock surfaces of glacially transported boulders and exposed bedrock.</p><p>[1] Jomelli et al. 2017. Quaternary Science Reviews 162, 128-144.</p><p>[2] Jomelli et al. 2018. Quaternary Science Reviews 183, 110-123.</p><p>[3] Renac et al. 2010. European Journal of Mineralogy 22, 215-234.</p>

COSMOGENIC 10BE SURFACE EXPOSURE DATING OF LATE HOLOCENE MORAINES OF THE HOOKER GLACIER, SOUTHERN ALPS, NZ

2019 ◽  
Author(s):  
Noel L. Potter ◽  
◽  
Joerg M. Schaefer ◽  
George H. Denton ◽  
Aaron E. Putnam ◽  
...  
Keyword(s):  
Late Holocene ◽  
Southern Alps ◽  
Surface Exposure Dating ◽  
Exposure Dating ◽  
Cosmogenic 10Be

Les nucleides cosmogeniques produits in-situ; de nouveaux outils en geomorphologie quantitative

2000 ◽  
Vol 171 (4) ◽  
pp. 383-396 ◽  
Author(s):  
Lionel L. Siame ◽  
Regis Braucher ◽  
Didier L. Bourles
Keyword(s):  
Cosmic Ray ◽  
Spatial Variations ◽  
Surface Exposure Dating ◽  
Exposure Dating ◽  
Mineral Fraction ◽  
Surficial Deposits ◽  
Geomorphic Processes ◽  
Quantitative Tool ◽  
In Situ Production

Abstract Measurement of 10 Be and 26 Al concentrations produced by cosmic ray bombardment within the quartz mineral fraction of surficial deposits and exposed bedrocks (in situ-production) is rapidly becoming an important quantitative tool in geomorphology. Whereas conventional methods provide age control on stratigraphic profiles, surface exposure dating using in situ-produced 10 Be and 26 Al is particularly well-suited not only for continuous dating but also for quantifying spatial variations and rates of geomorphic processes.

scholarly journals Evaluating post-glacial bedrock erosion and surface exposure duration by coupling in-situ OSL and <sup>10</sup>Be dating

2019 ◽  
Author(s):  
Benjamin Lehmann ◽  
Frédéric Herman ◽  
Pierre G. Valla ◽  
Georgina E. King ◽  
Rabiul H. Biswas
Keyword(s):  
Exposure Duration ◽  
Numerical Approach ◽  
Surface Erosion ◽  
Exposure Dating ◽  
Quaternary Glaciation ◽  
Bedrock Erosion ◽  
Bedrock Surface ◽  
Cosmogenic 10Be ◽  
The Impact

Abstract. Assessing the impact of Quaternary glaciation at the Earth’s surface implies understanding of the long-term evolution of alpine landscapes. In particular, it requires simultaneous quantification of the impact of climate variability on past glacier fluctuations and on bedrock erosion. Here we present a new approach for evaluating post-glacial bedrock surface erosion in mountainous environments by combining in-situ cosmogenic 10Be (TCN) and optically stimulated luminescence (OSL) surface exposure dating. Using a numerical approach, we show how it is possible to simultaneously invert bedrock OSL signals and 10Be concentrations into quantitative estimates of post-glacial exposure duration and bedrock surface erosion. By exploiting the fact that OSL and TCN data are integrated over different timescales, this approach can be used to estimate how bedrock erosion rates vary spatially and temporally since glacier retreat in an alpine environment.

Timing of rockfalls in the Mont Blanc massif (Western Alps): evidence from surface exposure dating with cosmogenic 10Be

Landslides ◽  
2018 ◽  
Vol 15 (10) ◽  
pp. 1991-2000 ◽  
Author(s):  
Xavi Gallach ◽  
Ludovic Ravanel ◽  
Markus Egli ◽  
Dagmar Brandova ◽  
Michael Schaepman ◽  
...  
Keyword(s):  
Western Alps ◽  
Surface Exposure Dating ◽  
Exposure Dating ◽  
Cosmogenic 10Be ◽  
Mont Blanc Massif

Cosmogenic 10Be surface exposure dating of ‘Little Ice Age’ glacial events in the Mount Jaggang area, central Tibet

The Holocene ◽  
2017 ◽  
Vol 27 (10) ◽  
pp. 1516-1525 ◽  
Author(s):  
Guocheng Dong ◽  
Weijian Zhou ◽  
Chaolu Yi ◽  
Li Zhang ◽  
Ming Li ◽  
...  
Keyword(s):  
Little Ice Age ◽  
Ice Age ◽  
Surface Exposure Dating ◽  
Exposure Dating ◽  
Cosmogenic 10Be ◽  
Central Tibet

Late Quaternary glaciation of the Tianshan, Central Asia, using cosmogenic 10Be surface exposure dating

2009 ◽  
Vol 72 (2) ◽  
pp. 229-233 ◽  
Author(s):  
Ping Kong ◽  
David Fink ◽  
Chunguang Na ◽  
Feixin Huang
Keyword(s):  
Electron Spin Resonance ◽  
Central Asia ◽  
Late Quaternary ◽  
Glacial Retreat ◽  
Surface Exposure Dating ◽  
Exposure Dating ◽  
Quaternary Glaciation ◽  
Spin Resonance ◽  
Cosmogenic 10Be ◽  
Exposure Ages

AbstractGlacial deposits are present at the head of the Ürümqi River valley, Tianshan, Central Asia. 10Be surface exposure ages of 15 boulders from three sites along a 12 km valley transect range from 9 to 21 ka suggesting emplacement by glacial retreat and advance commencing at the global last glacial maximum (LGM) and most likely abating in the early Holocene. Although the age spread for a given locality is not small, perhaps indicating post-depositional reworking, maximum ages per site are either coeval with or are post-LGM and inconsistent with previous pre-LGM electron spin resonance ages.

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