First cosmic ray exposure dating (in situ produced10Be) of the late pleistocene and holocene glaciation in the Nanhutashan Mountains (Taiwan)

Terra Nova ◽  
2007 ◽  
Vol 19 (5) ◽  
pp. 331-336 ◽  
Author(s):  
J. Carcaillet ◽  
L. L. Siame ◽  
H.-T. Chu ◽  
D. L. Bourlès ◽  
W.-C. Lu ◽  
...  
Keyword(s):  
Late Pleistocene ◽  
Cosmic Ray ◽  
Exposure Dating

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.

Late Pleistocene glaciers in Darhad Basin, northern Mongolia

2008 ◽  
Vol 69 (2) ◽  
pp. 169-187 ◽  
Author(s):  
Alan R. Gillespie ◽  
Raymond M. Burke ◽  
Goro Komatsu ◽  
Amgalan Bayasgalan
Keyword(s):  
Central Asia ◽  
Lake Sediments ◽  
Late Pleistocene ◽  
Cosmic Ray ◽  
Luminescence Dating ◽  
Equilibrium Line ◽  
Equilibrium Line Altitude ◽  
Exposure Dating ◽  
Northern Mongolia ◽  
Dammed Lake

Late Pleistocene glaciers around Darhad Basin advanced to near their maximum positions at least three times, twice during the Zyrianka glaciation (at ∼ 17–19 ka and ∼ 35–53 ka), and at least once earlier. The Zyrianka glaciers were smaller than their predecessors, but the equilibrium-line altitude (ELA) difference was < 75 m. End moraines of the Zyrianka glaciers were ∼ 1600 m asl; ELAs were 2100–2400 m asl.14C and luminescence dating of lake sediments confirm the existence of paleolake highstands in Darhad Basin before ∼ 35 ka. Geologic evidence and10Be cosmic-ray exposure dating of drift suggests that at ∼ 17–19 ka the basin was filled at least briefly by a glacier-dammed lake ∼ 140 m deep. However, lake sediments from that time have not yet been recognized in the region. A shallower paleolake briefly occupied the basin at ∼ 11 ka, but between ∼ 11 and 17 ka and after ∼ 10 ka the basin was probably largely dry. The timing of maximum glacier advances in Darhad appears to be approximately synchronous across northern Mongolia, but different from Siberia and western Central Asia, supporting the inference that paleoclimate in Central Asia differed among regions.

Cosmic ray exposure dating with in situ produced cosmogenic 3He: Results from young Hawaiian lava flows

1990 ◽  
Vol 97 (1-2) ◽  
pp. 177-189 ◽  
Author(s):  
Mark D. Kurz ◽  
Debra Colodner ◽  
Thomas W. Trull ◽  
Richard B. Moore ◽  
Keran O'Brien
Keyword(s):  
Cosmic Ray ◽  
Lava Flows ◽  
Exposure Dating ◽  
Hawaiian Lava

Quantifying post-glacial erosion at the Gorner glacier, Switzerland, using OSL and 10Be surface exposure dating.

2020 ◽  
Author(s):  
Joanne Elkadi ◽  
Benjamin Lehmann ◽  
Georgina King ◽  
Olivia Steinemann ◽  
Susan Ivy-Ochs ◽  
...  
Keyword(s):  
Spatial Scales ◽  
Cosmic Ray ◽  
Western Alps ◽  
Optically Stimulated Luminescence ◽  
Surface Erosion ◽  
Glacial Erosion ◽  
Surface Exposure Dating ◽  
Erosion Rates ◽  
Exposure Dating

&lt;p&gt;Quaternary erosion through glacial and post-glacial processes has left an imprint on Alpine topography. There are few methods capable of resolving these processes on Late glacial to Holocene timescales. The aim of this study is to contribute towards a more detailed understanding of post-glacial erosion across the Central and Western Alps by better constraining the post-glacial erosion history of the Gorner glacier in Zermatt, Switzerland. This is done using a new approach that combines Optically Stimulated Luminescence (OSL) and &lt;sup&gt;10&lt;/sup&gt;Be cosmogenic nuclide surface exposure dating to invert for post-glacial erosion rates (Lehmann et al., 2019). Both dating methods are influenced by surface erosion but operate on different spatial scales- OSL signals form within the first 1-5 mm of a rock surface (Sohbati et al., 2011) whereas the &lt;sup&gt;10&lt;/sup&gt;Be signal accumulates within approximately the first 3 m (Lal, 1991). Six bedrock samples, exposed progressively since the Last Glacial Maximum, were collected along a vertical transect spanning an elevation of 641 m. Preliminary results show inheritance in the bottom three samples suggesting multiple advances and retreat. Further results for the post-glacial erosion rates down the transect, and comparison to other glaciers in the Western Alps, will be presented.&lt;/p&gt;&lt;p&gt;References:&lt;/p&gt;&lt;p&gt;Lal, D., 1991. Cosmic ray labelling of erosion surfaces: in situ nuclide production rates and erosion models. Earth and Planetary Science Letters, 104, 424-439.&lt;/p&gt;&lt;p&gt;Lehmann, B et al., 2019. Evaluating post-glacial bedrock erosion and surface exposure duration by coupling in situ optically stimulated luminescence and &lt;sup&gt;10&lt;/sup&gt;Be dating. Earth Surface Dynamics, 7.&lt;/p&gt;&lt;p&gt;Sohbati, R. et al., 2011. Investigating the resetting of OSL signals in rock surfaces. Geochronometria, 38(3), 249-258.&lt;/p&gt;

Late Pleistocene Glaciation of the Kosciuszko Massif, Snowy Mountains, Australia

2001 ◽  
Vol 55 (2) ◽  
pp. 179-189 ◽  
Author(s):  
Timothy T. Barrows ◽  
John O. Stone ◽  
L. Keith Fifield ◽  
Richard G. Cresswell
Keyword(s):  
Late Pleistocene ◽  
Pleistocene Glaciation ◽  
Glacial Cycle ◽  
Cosmogenic Isotope ◽  
Geomorphic Mapping ◽  
Exposure Dating ◽  
Southeastern Australia ◽  
Blue Lake ◽  
Glacier Advance

AbstractLate Pleistocene glaciation of the Australian mainland was restricted to a small area of the southeastern highlands. Geomorphic mapping of the area and exposure dating using thein situproduced cosmogenic isotope10Be provides evidence for at least two distinct glaciations. The Early Kosciuszko glaciation consisted of a single glacier advance before 59,300 ± 5400 years ago (Snowy River Advance). The Late Kosciuszko glaciation comprised three glacier advances 32,000 ± 2500 (Headley Tarn Advance), 19,100 ± 1600 (Blue Lake Advance), and 16,800 ± 1400 years ago (Mt. Twynam Advance). The Early Kosciuszko glaciation was the most extensive and the Late Kosciuszko advances were progressively less extensive. These periods of glaciation in the highlands correspond to episodes of periglacial activity and peaks in lake levels and river discharge at lower elevations in southeastern Australia. Glacier advances on the Kosciuszko Massif correlate with advances in Tasmania, South America, and New Zealand and are broadly representative of hemispheric climate changes during the last glacial cycle.

scholarly journals Late Pleistocene glaciation history of the southern Black Forest, Germany: 10 Be cosmic‐ray exposure dating and equilibrium line altitude reconstructions in Sankt Wilhelmer Tal

2022 ◽  
Author(s):  
Felix Martin Hofmann ◽  
Frank Preusser ◽  
Irene Schimmelpfennig ◽  
Laëtitia Léanni ◽  
Aster team (Georges Aumaître, Karim Keddadouche & Fawzi Zaid
Keyword(s):  
Late Pleistocene ◽  
Cosmic Ray ◽  
Equilibrium Line ◽  
Pleistocene Glaciation ◽  
Black Forest ◽  
Equilibrium Line Altitude ◽  
Exposure Dating ◽  
History Of

scholarly journals Cosmic-Ray Driven Outflows to Mpc Scales from L* Galaxies

2020 ◽  
Author(s):  
Philip F Hopkins ◽  
T K Chan ◽  
Suoqing Ji ◽  
Cameron B Hummels ◽  
Dušan Kereš ◽  
...  
Keyword(s):  
Cosmic Ray ◽  
Plane Layer ◽  
Equilibrium Density ◽  
Pressure Gradients ◽  
Low Velocity ◽  
Star Forming ◽  
Stellar Feedback ◽  
Massive Halos ◽  
Halo Masses

Abstract We study the effects of cosmic rays (CRs) on outflows from star-forming galaxies in the circum and inter-galactic medium (CGM/IGM), in high-resolution, fully-cosmological FIRE-2 simulations (accounting for mechanical and radiative stellar feedback, magnetic fields, anisotropic conduction/viscosity/CR diffusion and streaming, and CR losses). We showed previously that massive (Mhalo ≳ 1011 M⊙), low-redshift (z ≲ 1 − 2) halos can have CR pressure dominate over thermal CGM pressure and balance gravity, giving rise to a cooler CGM with an equilibrium density profile. This dramatically alters outflows. Absent CRs, high gas thermal pressure in massive halos “traps” galactic outflows near the disk, so they recycle. With CRs injected in supernovae as modeled here, the low-pressure halo allows “escape” and CR pressure gradients continuously accelerate this material well into the IGM in “fast” outflows, while lower-density gas at large radii is accelerated in-situ into “slow” outflows that extend to &gt;Mpc scales. CGM/IGM outflow morphologies are radically altered: they become mostly volume-filling (with inflow in a thin mid-plane layer) and coherently biconical from the disk to &gt;Mpc. The CR-driven outflows are primarily cool (T ∼ 105 K) and low-velocity. All of these effects weaken and eventually vanish at lower halo masses (≲ 1011 M⊙) or higher redshifts (z ≳ 1 − 2), reflecting the ratio of CR to thermal+gravitational pressure in the outer halo. We present a simple analytic model which explains all of the above phenomena. We caution that these predictions may depend on uncertain CR transport physics.

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