Late Quaternary glacial history of the Nalati Range, central Tian Shan, China, investigated using10Be surface exposure dating

2016 ◽  
Vol 31 (7) ◽  
pp. 659-670 ◽  
Author(s):  
Mei Zhang ◽  
Yixin Chen ◽  
Yingkui Li ◽  
Gengnian Liu
Keyword(s):  
Late Quaternary ◽  
Glacial History ◽  
Surface Exposure Dating ◽  
Exposure Dating ◽  
History Of ◽  
Tian Shan

RECONSTRUCTING THE GLACIAL HISTORY OF THE HUNAFLOI BAY REGION IN NORTHWEST ICELAND USING COSMOGENIC36CL SURFACE EXPOSURE DATING

2016 ◽  
Author(s):  
Amanda N. Houts ◽  
◽  
Joseph M. Licciardi ◽  
Sarah M. Principato ◽  
Susan H. Zimmerman ◽  
...  
Keyword(s):  
Glacial History ◽  
Surface Exposure Dating ◽  
Exposure Dating ◽  
History Of

Constraints on the late Quaternary glacial history of the Inylchek and Sary-Dzaz valleys from in situ cosmogenic 10Be and 26Al, eastern Kyrgyz Tian Shan

2014 ◽  
Vol 101 ◽  
pp. 77-90 ◽  
Author(s):  
Nathaniel Lifton ◽  
Casey Beel ◽  
Clas Hättestrand ◽  
Christine Kassab ◽  
Irina Rogozhina ◽  
...  
Keyword(s):  
Late Quaternary ◽  
Glacial History ◽  
History Of ◽  
Cosmogenic 10Be ◽  
Tian Shan

Late quaternary sedimentation and glacial history of the western Svalbard continental margin

1996 ◽  
Vol 133 (3-4) ◽  
pp. 123-156 ◽  
Author(s):  
Espen S. Andersen ◽  
Trond M. Dokken ◽  
Anders Elverhøi ◽  
Anders Solheim ◽  
Ingrid Fossen
Keyword(s):  
Continental Margin ◽  
Late Quaternary ◽  
Glacial History ◽  
History Of

Post-LGM glacial history of Aosta Valley (western Italian Alps) and implications for Alpine paleo-atmospheric circulations

2020 ◽  
Author(s):  
Elena Serra ◽  
Pierre G. Valla ◽  
Natacha Gribenski ◽  
Fabio Magrani ◽  
Julien Carcaillet ◽  
...  
Keyword(s):  
Atmospheric Circulation ◽  
Glacier Retreat ◽  
Circulation System ◽  
Glacial History ◽  
Exposure Dating ◽  
Glacier Fluctuations ◽  
History Of ◽  
The Alps ◽  
Gran Paradiso ◽  
Paleoclimate Proxies

<p>Mountain glaciers are useful quantitative paleoclimate proxies because of their mass-balance being sensitive to both temperature and precipitation. Paleoglacial reconstructions in the Alps, together with other paleoclimate proxies<sup>[1]</sup>, suggest a shift in Alpine atmospheric circulation during the Last Glacial Maximum (LGM), with a change from northerly (Atlantic) to south-westerly (Mediterranean) moisture advection<sup>[2]</sup>. However, the post-LGM reorganization of the atmospheric circulation system in terms of both amplitude and timing remains elusive, as well as the resulting glacier response in the Alps<sup>[3,4]</sup>.</p><p>This study focuses on Aosta Valley and its tributaries (SW Alps, Italy). Few chronological constraints are available for the post-LGM glacial history of the region, mainly related to the Ivrea Amphitheatre (terminal extent of Pleistocene glaciations)<sup>[5]</sup> and the Mont-Blanc massif<sup>[6]</sup>. We aim to quantify the potential variability in glacier responses for the different massif catchments of Aosta Valley, our working hypothesis being that they have distinct geomorphic (e.g. hypsometry) and climatic conditions (e.g. aspect, moisture sources). Following a detailed geomorphological mapping of glacial landforms and deposits, we sampled moraine boulders and glacially-polished bedrock for <em>in-situ</em> <sup>10</sup>Be surface exposure dating in 3 main massifs: Mont-Blanc (Courmayeur), Matterhorn (Valpelline) and Gran Paradiso (Val di Cogne and Valsavarenche). In addition, we also investigated the confluence between Aosta Valley and Gran Paradiso valleys (Saint Pierre area). Morphometric analyses were conducted to investigate the possible influence of local factors (e.g. hypsometry and aspect) on glacier fluctuations, before isolating a climatic signal from our paleoglacial reconstructions.</p><p>Our <sup>10</sup>Be chronology and boulder provenance results testify that glaciers from Mont-Blanc were lastly occupying the Aosta Valley in Saint Pierre at ca. 15 ka, while Gran Paradiso glaciers had already retreated within tributary valleys. In the upper Aosta Valley, Mont-Blanc glaciers retreat is marked by at least<sup>[7]</sup> two Late-glacial stages nearby Courmayeur at ca. 14 and 11 ka. Bedrock deglaciation profiles in Valpelline (SW of Matterhorn) record an onset of ice-thinning at ca. 14 ka, well after glacier retreat from the Ivrea Amphitheatre (20-24 ka)<sup>[5]</sup>. This result agrees with other studies from high Alpine passes<sup>[9]</sup>, supporting the idea that glaciers thinning within the high Alps clearly postdated the rapid post-LGM deglaciation in the foreland. Final deglaciation of Valpelline occurred at ca. 10-11 ka (Younger Dryas), roughly synchronous with the final glacier retreat in Courmayeur. Additional <sup>10</sup>Be samples from the Gran Paradiso valleys are under process to further assess potential spatial variability in post-LGM glacier fluctuations between the main northern and southern massifs. Finally, paleoglacial reconstructions and geochronology constraints will be included in ice numerical simulations to test the potential influence of precipitation changes on glacier retreat within the Aosta Valley.</p><p><strong>References</strong></p><p><sup>[1]</sup>Heiri, O. et al., 2014, Quaternary Science Reviews.</p><p><sup>[2]</sup>Florineth, D. & Schlüchter, C., 2000, Quaternary Research.</p><p><sup>[3]</sup>Luetscher, M. et al., 2015, Nature Communications.</p><p><sup>[4]</sup>Monegato, G. et al., 2017, Scientific reports.</p><p><sup>[5]</sup>Gianotti, F. et al., 2015, Alpine and Mediterranean Quaternary.</p><p><sup>[6]</sup>Wirsig, C. et al., 2016, Quaternary Science Reviews.</p><p><sup>[7]</sup>Porter, S. & Orombelli, G., 1982, Boreas.</p><p><sup>[8]</sup>Ivy-ochs, S., 2015, Cuadernos de Investigación Geográfica.</p><p><sup>[9]</sup>Hippe, K. et al., 2014, Quaternary Geochronology.</p>

scholarly journals Glacial history of Inglefield Land, north Greenland from combined in-situ <sup>10</sup>Be and <sup>14</sup>C exposure dating

2020 ◽  
Author(s):  
Anne Sofie Søndergaard ◽  
Nicolaj Krog Larsen ◽  
Olivia Steinemann ◽  
Jesper Olsen ◽  
Svend Funder ◽  
...  
Keyword(s):  
Climate Changes ◽  
Ice Sheet ◽  
Greenland Ice Sheet ◽  
Ice Age ◽  
Glacial History ◽  
Holocene Climate ◽  
Exposure Dating ◽  
History Of ◽  
North Greenland

Abstract. Exposing the sensitivity of the Greenland Ice Sheet (GrIS) to Holocene climate changes is a key prerequisite for understanding the future response of the ice sheet to global warming. In this study, we present new information on the Holocene glacial history of the GrIS in Inglefield Land, north Greenland. We use 10Be and in-situ 14C exposure dating to constrain the timing of deglaciation in the area and radiocarbon dating of reworked molluscs and wood fragments to constrain when the ice sheet retreated behind its present-day extent. The 10Be ages are scattered ranging from c. 92.7 to 6.8 ka whereas the in-situ 14C ages range from c. 14.2 to 6.7 ka. Almost half of the apparent 10Be ages predate the Last Glacial Maximum and up to 89 % are to some degree affected by nuclide inheritance. Based on the few reliable 10Be ages, the in-situ 14C ages and existing radiocarbon ages from Inglefield Land, we find that the deglaciation along the coast commenced c. 8.6–8.3 cal. ka BP in the western part and c. 7.9 ka in the central part, following the opening of Nares Strait and arrival of warm waters. The ice margin reached its present-day position c. 8.2 ka at the Humboldt Glacier and c. 6.7 ka in the central part of Inglefield Land. Radiocarbon ages of reworked molluscs and wood fragments show that the ice margin was behind its present-day extent from c. 5.8 to 0.5 cal. ka BP. After 0.5 cal. ka BP, the ice advanced towards its Little Ice Age position. Our results emphasize that the slowly eroding and possibly cold-based ice in north Greenland makes it difficult to constrain the deglaciation history based on 10Be ages alone unless it is paired with in-situ 14C ages. Further, combining our findings with those of recently published studies reveals distinct differences between deglaciation patterns of northwest and north Greenland. Deglaciation of the land areas in northwest Greenland occurred earlier than in north Greenland and periods of restricted ice extent were longer, spanning middle and late Holocene. Overall, this highlights past ice sheet sensitivity towards Holocene climate changes in an area where little information was available just a few years ago.

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