Restricted accessResearch articleFirst published online 2008-12
Cosmogenic 10 Be and 26 Al ages of Holocene moraines in southern Norway II: evidence for individualistic responses of high-altitude glaciers to millennial-scale climatic fluctuations
Abstract:10Be and 26Al exposure ages are reported for boulder moraine ridges in front of two high-altitude cirque glaciers (Austanbotnbreen, Jotunheimen and Østre Tundradalskyrkjabre, Breheimen) in southern Norway. Ages and 1σ external uncertainties for Austanbotnbreen moraines range from 7.4 ± 0.75 ka to 8.7 ± 0.9 ka when no adjustment for snow shielding is made. With the maximum conceivable snow cover effect (2 m thick, a density of 0.2 g/cm3 , 6 months duration) at the exposed site, the resulting adjusted (7.7 ± 0.8 to 10.9 ± 1.3 ka) as well as unadjusted ages suggest moraine formation possibly during both the 8.2 ka event (Finse Event in southern Norway) and the Erdalen Event (c. 10.0 ka). In contrast, ages obtained for the outer ridges of the large moraine complex in front of Østre Tundradalskyrkjabre range from 1.1 ± 0.3 ka to 1.9 ± 0.4 ka assuming no snow shielding. Assuming extreme snow-lie conditions (4 m thick, 0.2 g/cm3 density, 6 months duration) at this more sheltered site, the adjusted ages (1.4 ± 0.4 to 2.4 ± 0.5 ka) still indicate late-Holocene, pre-`Little Ice Age' ridge formation. Less likely alternative explanations of the late-Holocene ages, including avalanching of debris onto the moraine, inventories of inherited nuclides in the samples and possible episodic `push-deformation' disturbance of the ice-cored moraine complex, are discussed. The results point to the potential of surface exposure dating in reconstructing Holocene glacier variation chronologies, particularly with respect to high-altitude glaciers and to individualistic responses of these glaciers to Holocene millennial-scale climatic fluctuations. Difficulties with dating moraines in front of small high-altitude glaciers using cosmogenic nuclides, including uncertain snow shielding effect, short glacial transport distance, possibly not `zeroing' an inherited cosmogenic signal and repeated disturbance of a moraine complex, are discussed.
André, M.-F.2002: Rates of postglacial rock weathering on glacially scoured outcrops (Abisko-Riksgränsen area, 68°N) . Geografiska Annaler84A, 139-50.
2.
Andersen, B.G. , Lundqvist, J. and Saarnisto, M.1995a: The Younger Dryas margin of the Scandinavian ice sheet - an introduction . Quaternary International28, 145-46.
3.
Andersen, B.G. , Mangerud, J. , Sørensen, R. , Reite, A. , Sveian, H. , Thoresen, M. and Bergström, B.1995b: Younger Dryas ice-marginal deposits in Norway . Quaternary International28, 147-69. Aune, B.1993: Temperatur Normaler. Normalperiode 1961-91 . Den norske meteorologiske institutt .
4.
Bakke, J. , Nesje, A. and Dahl, S.O.2005a: Lateglacial and early Holocene palaeoclimatic reconstruction based on glacier fluctuations and equilibrium-line altitudes at northern Folgefonna, Hardanger, western Norway . Journal of Quaternary Science20, 179-98.
5.
Bakke, J. , Lie, Ø. , Nesje, A. , Dahl, S.O. and Paasche, Ø.2005b: Utilizing physical sediment variability in glacier-fed lakes for continuous glacier reconstructions during the Holocene, northern Folgefonna, western Norway . The Holocene15, 161-76.
6.
Balco, G. , Stone, J.O. , Lifton, N.A. and Dunai, T.J.2008: A complete and easily accessible means of calculating surface exposure ages or erosion rates from 10Be and 26Al measurements . Quaternary Geochronology3, 174-95.
7.
Benson, L. , Madole, R. , Phillips, W. , Landis, G. , Thomas, T. and Kubik, P.2004: The probable importance of snow and sediment shielding on cosmogenic ages of north-central Colorado Pinedale and pre-Pinedale moraines . Quaternary Science Reviews23, 193-206.
8.
Benson, L. , Madole, R. , Kubik, P. and McDonald, R.2007: Surface-exposure ages of Front Range moraines that may have formed during the Younger Dryas, 8.2 cal ka, and Little Ice Age events . Quaternary Science Reviews26, 1638-49.
9.
Briner, J.P. , Kaufman, D.S. , Manley, W.E. , Finkel, R.C. and Caffee, M.W.2005: Cosmogenic exposure dating of late Pleistocene moraine stabilization in Alaska . Geological Society of America Bulletin117, 1108-20.
10.
Clarke, G.K.C. , Leverington, D.W. , Teller, J.T. and Dyke, A.S.2004: Paleohydraulics of the last outburst flood from glacial Lake Agassiz and the 8200 BP cold event . Quaternary Science Reviews23, 389-407.
11.
Cockburn, H.A.P. and Summerfield, M.A.2004: Geomorphological applications of cosmogenic isotope analysis . Progress in Physical Geography28, 1-42.
12.
Dahl, E.1956: Rondane: mountain vegetation in South Norway and its relation to environment . Skrifter utgitt av det Norske Videnskapsacademi i Oslo (Matematisk-naturvidenskapelig klasse)3, 1-374.
13.
Dahl, S.O. and Nesje, A.1994: Holocene glacier fluctuations at Hardangerjøkulen, central-southern Norway: a high-resolution composite chronology from lacustrine and terrestrial deposits . The Holocene4, 269-77.
14.
---- 1996: A new approach to calculating winter precipitation by combining glacier equilibrium-line altitudes and pine-tree limits: a case study from Hardangerjøkulen, central southern Norway . The Holocene6, 381-98.
15.
Dahl, S.O. , Nesje, A. and vstedal, J.1997: Cirque glaciers as morphological evidence for a thin Younger Dryas ice sheet in east-central southern Norway . Boreas26, 161-80.
16.
Dahl, S.O. , Nesje, A. , Lie, Ø. , Fjordheim, K. and Matthews, J.A.2002: Timing, equilibrium-line altitudes and climatic implications of two early-Holocene readvances during the Erdalen event at Jostedalsbreen, western Norway . The Holocene12, 17-25.
17.
Everest, J.D. , Bradwell, T. , Fogwill, C.J. and Kubik, P.W.2006: Cosmogenic Be age constraints for the Wester Ross Readvance moraine: insights into British ice-sheet behaviour . Geografiska Annaler88A, 9-17.
18.
Fabel, D. , Fink, D. , Fredin, O. , Harbor, J. , Land, M. and Stroeven, A.P.2006: Exposure ages for relict lateral moraines overridden by the Fennoscandian ice sheet . Quaternary Research65, 136-46.
19.
Førland, E.J.1993: Nedbørnormaler Normalperiode 1961-91. Den norske meteorologiske institutt , Rapport 39/93.
20.
Freeman, S.P.H.T. , Bishop, P. , Bryant, C. , Cook, G. , Fallick, A. , Harkness, D. , Metcalfe, S. , Scott, M. , Scott, R. and Summerfield, M.2004: A new environmental sciences AMS laboratory in Scotland . Nuclear Instruments and MethodsB231, 223-24.
21.
Freeman, S. , Bishop, P. , Bryant, C. , Cook, G. , Dougans, D. , Ertunc, T. , Fallick, A. , Ganeshram, R. , Maden, C. , Naysmith, P. , Schnabel, C. , Scott, M. , Summerfield, M. and Xu, S.2007: The SUERC AMS laboratory after 3 years . Nuclear Instruments and MethodsB259, 66-70.
22.
Gosse, J.C. and Phillips, F.M.2001: Terrestrial in situ cosmogenic nuclides: theory and application . Quaternary Science Reviews20, 1475-560.
23.
Grove, J.M.1972: The incidence of landslides, avalanches and floods in western Norway during the Little Ice Age . Arctic and Alpine Research4, 131-38.
24.
Gulliksen, S. , Birks, H.H. , Possnert, G. and Mangerud, J.1998: A calendar age estimate of the Younger Dryas-Holocene boundary at Kråkenes, western Norway . The Holocene8, 249-59.
25.
Haines-Young, R.H.1983: Size variation of Rhizocarpon on moraine slopes in southern Norway . Arctic and Alpine Research15, 295-305.
26.
Hallet, B. and Putkonen, J.1994: Surface dating of dynamic landforms: young boulders on aging moraines . Science265, 937-40.
27.
Helle, S.K. , Anundsen, K. , Aasheim, S. and Haflidason, H.1997: Indications of a Younger Dryas marine transgression in Inner Hardanger, West Norway . Norsk Geologisk Tidsskrift77, 101-17.
28.
Helliwell, R.C. , Soulsby, C. , Ferrier, R.C. and Jenkins, A.1998: Influence of snow on the hydrology and hydrochemistry of the Allt a'Mharcaidh, Cairngorm Mountains, Scotland . Science of the Total Environment217, 59-70.
29.
Isaksen, K. , Hauck, C. , Gudevang, E. , degård, R.S. and Sollid, J.L.2002: Mountain permafrost distribution in Dovrefjell and Jotunheimen, southern Norway, based on BTS and DC resistivity tomography data . Norsk Geologisk Tidsskrift56, 122-36.
30.
Ivy-Ochs, S. , Kerschner, H. and Schlüchter, C.2007: Cosmogenic nuclides and the dating of Lateglacial and Early Holocene glacier variations: the Alpine perspective . Quaternary International164-165, 53-63.
31.
Jackson, L.E. , Phillips, F.M. and Little, E.C.1999: Cosmogenic Cl dating of the maximum limit of the Laurentide Ice Sheet in southwestern Alberta . Canadian Journal of Earth Sciences36, 1347-56.
32.
Kelly, M.A. , Ivy-Ochs, S. , Kubik, P.W. , Von Blanckenburg, F. and Schlüchter, C.2006: Chronology of deglaciation based on Be dates of glacial erosional features in the Grimsel Pass region, central Swiss Alps . Boreas35, 634-43.
33.
Kerschner, H. , Hartl, A. , Gross, G. , Ivy-Ochs, S. and Kubrik, P.2006: Surface exposure dating of moraines in the Kromer valley (Silvretta Mountains, Austria) - evidence for glacial response to the 8.2 ka event in the Eastern Alps?The Holocene16, 7-15.
34.
Koestler, A.G.1983: Hurrungane . Berggrunsgeologisk kart 1517 IV, 1: 50 ,000, foreløpig utgave. Norges geologiske undersøkelse.
35.
Lal, D.1991: Cosmic ray labelling of erosion surfaces: in situ production rates and erosion models . Earth and Planetary Science Letters104, 424-39.
36.
Lutro, O. and Tveten, E.1996: Geologisk kart over Norge , berggrunnskart Årdal M1: 250 ,000. Norges geologiske undersøkelse.
37.
Maden, C. , Anastasi, P.A.F. , Dougans, D. , Freeman, S.P.H.T. , Kitchen, R. , Klody, G. , Schnabel, C. , Sundquist, M. , Vanner, K. and Xu, S.2007: SUERC AMS ion detection . Nuclear Instruments and MethodsB259, 131-39.
38.
Mangerud, J.2000: Was Hardangerfjorden, western Norway, glaciated during the Younger Dryas?Norsk Geologisk Tidsskrift80, 229-34.
39.
Matthews, J.A. and Dresser, P.Q.2008: Holocene glacier variation chronology of the Smørstabbtindan massif, Jotunheimen, southern Norway, and the recognition of century- to millennial-scale European neoglacial events . The Holocene18, 181-201.
40.
Matthews, J.A. and Shakesby, R.A.1984: The status of the `Little Ice Age' in southern Norway: relative-age dating of Neoglacial moraines with Schmidt hammer and lichenometry . Boreas13, 333-46.
41.
Matthews, J.A. , Dahl, S.O. , Nesje, A. , Berrisford, M.S. and Andersson, C.2000: Holocene glacier variations in central Jotunheimen, southern Norway based on distal glaciolacustrine sediment cores . Quaternary Science Reviews19, 1625-47.
42.
Matthews, J.A. , Berrisford, M.S. , Dresser, P.Q. , Nesje, A. , Dahl, S.O. , Bjune, A.E. , Bakke, J. , Birks, J.B. , Lie, Ø.Dumayne-Peaty, L. and Barnett, C.2005: Holocene glacier history of Bjørnbreen and climatic reconstruction in central Jotunheimen, Norway, based on proximal glaciofluvial stream-bank mires . Quaternary Science Reviews24, 67-90.
43.
Matthews, J.A. , Shakesby, R.A. , Schnabel, C. and Freeman, S. 10 26 2008: Cosmogenic Be and Al ages of Holocene moraines in southern Norway I: testing the method and confirmation of the date of the Erdalen Event (c. 10.0 ka) at its type-site . The Holocene18, 1155-64, (this issue).
44.
McCarroll, D.1989a: Potential and limitations of the Schmidt hammer for relative-age dating: field tests on Neoglacial moraines, Jotunheimen, southern Norway . Arctic and Alpine Research21, 268-75.
45.
---- 1989b: Schmidt hammer relative-age evaluation of a possible pre-`Little Ice Age' Neoglacial moraine, Leirbreen, southern Norway . Norsk Geologisk Tidsskrift69, 125-30.
46.
---- 1991: The age and origin of neoglacial moraines, Jotunheimen, southern Norway: new evidence from weathering-based data . Boreas20, 283-95.
47.
---- 1993: Modelling late-Holocene snow-avalanche activity: incorporating a new approach to lichenometry . Earth Surface Processes and Landforms18, 527-39.
48.
McCarroll, D. , Matthews, J.A. and Shakesby, R.A.1995: Late-Holocene snow-avalanche activity in southern Norway: interpreting lichen-size frequency distributions using an alternative to simulation modelling . Earth Surface Processes and Landforms20, 465-71.
49.
Nesje, A. and Dahl, S.O.1991: Late Holocene glacier fluctuations in Bevringsdalen, Jostedalsbreen region, western Norway (c. 3200-1400 BP) . The Holocene1, 1-7.
50.
---- 1993: Lateglacial and Holocene glacier fluctuations and climatic variations in western Norway: a review . Quaternary Science Reviews12, 255-61.
51.
---- 2001: The Greenland 8200 cal. yr BP event detected in loss-on-ignition profiles in Norwegian lacustrine sediment sequences . Journal of Quaternary Science16, 155-66.
52.
Nesje, A. , Dahl, S.O. , Andersson, C. and Matthews, J.A.2000: The lacustrine sedimentary succession in Sygneskardvatnet, western Norway: a continuous, high-resolution record of the Jostedalsbreen ice cap during the Holocene . Quaternary Science Reviews19, 1047-65.
53.
Nesje, A. , Matthews, J.A. , Dahl, S.O. , Berrisford, M.S. and Andersson, C.2001: Holocene glacier fluctuations of Flatebreen and winter-precipitation changes in the Jostedalsbreen region, western Norway, based on glaciolacustrine sediment records . The Holocene11, 267-80.
54.
Nesje, A. , Dahl, S.O. and Lie, Ø.2004: Holocene millennial-scale summer temperature variability inferred from sediment parameters in a non-glacial mountain lake: Danntjørn, Jotunheimen, central southern Norway . Quaternary Science Reviews23, 2183-205.
55.
Nesje, A. , Bjune, A.E. , Bakke, J. , Dahl, S.O. , Lie, Ø. and Birks, H.J.B.2006: Holocene palaeoclimate reconstructions at Vanndalsvatnet, western Norway, with particular reference to the 8200 cal. yr BP event . The Holocene16, 717-29.
56.
Nesje, A. , Bakke, J. , Dahl, S.O. , Lie, Ø. and Matthews, J.A.2008: Norwegian mountain glaciers in the past, present and future . Global and Planetary Change60, 10-27.
57.
strem, G.1961: Breer og morener i Jotunheimen . Norsk Geografisk Tidsskrift17, 210-42.
58.
---- 1964: Ice-cored moraines in Scandinavia . Geografiska Annaler47A, 1-38.
59.
strem, G. , Selvig, K.D. and Tandberg, K.1988: Atlas over Breer i Sør-Norge . Norges Vassdrags- og Energiverk Vassdragsdirektoratet, 180 pp.
60.
Owen, G. , Matthews, J.A. and Albert, P.G.2007: Rates of Holocene chemical weathering, `Little Ice Age' glacial erosion and implications for Schmidt hammer dating at a glacier-foreland boundary, Fåbergstølsbreen, southern Norway . The Holocene17, 829-34.
61.
Pallàs, R. , Ángel, R. , Braucher, R. , Carcaillet, J. , Ortuño, M. , Bordonau, J. , Bourlès, D. , Vilaplana, J.M. , Masana, E. and Santanach, P.2006: Late Pleistocene and Holocene glaciation in the Pyrenees: a critical review and new evidence from Be exposure ages, south-central Pyrenees . Quaternary Science Reviews25, 2937-63.
62.
Putkonen, J. and O'Neal, M.2006: Degradation of unconsolidated Quaternary landforms in the western North America . Geomorphology75, 408-19.
63.
Putkonen, J. and Swanson, T.2003: Accuracy of cosmogenic ages for moraines . Quaternary Research59, 255-61.
64.
Rinterknecht, V.R. , Marks, L. , Piotrowski, J.A. , Raisbeck, G.M. , Yiou, F. , Brook, E.J. and Clark, P.U.2006: `Cosmogenic Be ages on the Pomeranian Moraine, Poland': reply to comments . Boreas35, 605-606.
65.
Rohling, E.J. and Pälike, H.2005: Centennial-scale climate cooling with a sudden cold event around 8,200 years ago . Nature434, 975-79.
66.
Schildgen, T.F. , Phillips, W.M. and Purves, R.S.2005: Simulation of snow shielding corrections for cosmogenic nuclide surface exposure studies . Geomorphology64, 67-85.
67.
Sejrup, H.P. , Larsen, E. , Landvik, J. , King, E.L. , Haflidason, H. and Nesje, A.2000: Quaternary glaciations in southern Fennoscandia: evidence from southwestern Norway and the northern North Sea region . Quaternary Science Reviews19, 667-85.
68.
Shakesby, R.A. , Dawson, A.G. and Matthews, J.A.1987: Rock glaciers, protalus ramparts and related phenomena, Rondane, Norway: a continuum of large-scale talus-derived landforms . Boreas16, 305-17.
69.
Shakesby, R.A. , Matthews, J.A. and Winkler, S.2004: Glacier variations in Breheimen, southern Norway: relative-age dating of Holocene moraine complexes at six high-altitude glaciers . The Holocene14, 899-910.
70.
Shakesby, R.A. , Matthews, J.A. and Owen, G.2006: The Schmidt hammer as a relative-age dating tool and its potential for calibrated-age dating in Holocene glaciated environments . Quaternary Science Reviews25, 2846-67.
71.
Shakesby, R.A. , Smith, J.G. , Matthews, J.A. , Winkler, S. , Dresser, P.Q. , Bakke, J. , Dahl, S.O. , Lie, Ø. and Nesje, A.2007: Reconstruction of Holocene glacier history from distal sources: glaciofluvial stream-bank mires and a glaciolacustrine sediment core near Sota Sæter, Breheimen, southern Norway . The Holocene17, 729-45.
72.
Sigmond, E.M.O. , Gustavson, M. and Roberts, D.1984: Berggrunnskart over Norge . Målestokk1: 1 million. Norges geologiske undersøkelse.
73.
Sollid, J.L. and Reite, A.1983: The last glaciation and deglaciation of central southern Norway. In Ehlers, J. , editor, Glacial deposits in north-west Europe. Balkema , 41-60.
74.
Stone, J.O.2000: Air pressure and cosmogenic isotope production . Journal of Geophysical Research105, 23753-59.
75.
Teller, J.T. , Leverington, D.W. and Mann, J.D.2002: Freshwater outbursts in the oceans from glacial Lake Agassiz and their role in climate change during the last deglaciation . Quaternary Science Reviews21, 879-87.
76.
Thomas, E.R. , Wolff, E.W. , Mulvaney, R. , Steffensen, J.P. , Johnsen, S.J. , Arrowsmith, C. , White, J.W.C. , Vaughn, B. and Popp, T.2007: The 8.2 ka event from Greenland ice cores . Quaternary Science Reviews26, 70-81.
77.
Tschudi, S. , Schäfer, J.M. , Zhao, Z. , Wu, X. , Ivy-Ochs, S. , Kubik, P.W. and Schlüchter, C.2003: Glacial advances in Tibet during the 10 26 21 Younger Dryas? Evidence from cosmogenic Be, Al, and Ne . Journal of Asian Earth Sciences22, 301-306.
78.
Winkler, S. , Matthews, J.A. , Shakesby, R.A. and Dresser, P.Q.2003: Glacier variations in Breheimen, southern Norway: dating Little Ice Age moraine sequences at seven low-altitude glaciers . Journal of Quaternary Science18, 395-413.
79.
Zreda, M. , Phillips, F.M. and Elmore, D.1994: Cosmogenic Cl accumulation in unstable landforms. 2. Simulations and measurements on eroding moraines . Water Resources Research30, 3127-36.
