LOGIN TO YOUR ACCOUNT

Username
Password
Remember Me
Or use your Academic/Social account:

CREATE AN ACCOUNT

Or use your Academic/Social account:

Congratulations!

You have just completed your registration at OpenAire.

Before you can login to the site, you will need to activate your account. An e-mail will be sent to you with the proper instructions.

Important!

Please note that this site is currently undergoing Beta testing.
Any new content you create is not guaranteed to be present to the final version of the site upon release.

Thank you for your patience,
OpenAire Dev Team.

Close This Message

CREATE AN ACCOUNT

Name:
Username:
Password:
Verify Password:
E-mail:
Verify E-mail:
*All Fields Are Required.
Please Verify You Are Human:
fbtwitterlinkedinvimeoflicker grey 14rssslideshare1
Geirsdóttir, Áslaug; Andrews, John T.; Ólafsdóttir, Saedís; Helgadóttir, Gudrún; Hardardóttir, Jórunn (2002)
Publisher: Co-Action Publishing
Journal: Polar Research
Languages: English
Types: Article
Subjects:
Evidence from north-west Iceland's shelf and fjords is used to develop a scenario for environmental change during the last 36 cal Ky. The retreat history of the Iceland Ice Cap during the last deglaciation is delineated through lithofacies studies, carbon analyses and magnetic susceptibility, and studies of ice-rafted debris (IRD) in sediment cores. Sedimentological data from lake Efstadalsvatn, Vestfirdir peninsula, trace the glacier retreat on land. In two of the high resolution shelf cores we detect near continuous IRD accumulation from 36 to 11 cal Kya. However, IRD is absent in the cores from ca. 22 to 19 cal Kya, possibly indicating more extensive landfast sea ice conditions. All cores show intensified IRD during the Younger Dryas chronozone; the fjord cores show a continuous IRD record until 10 cal Kya. Magnetic susceptibility and carbon analyses from Efstadalsvatn reveal the disappearance of local ice in the basin just before 10.5 cal Kya. No IRD was detected in the sediment cores during 10 to Ø4 cal Kya. Some indication of cooling occurs between 4 and 3 cal Kya, with a fresh input of IRD in fjord cores after 1 cal Kya.
  • The results below are discovered through our pilot algorithms. Let us know how we are doing!

    • Alley, R. B., Mayewski, P. A., Sowers, T., Stuiver, M., Taylor, K. C. & Clark, P. U. 1997: Holocene climate instability: a prominent, widespread event 8200 yr ago. Geology 25, 483–486.
    • Andrews, J. T., Hardardóttir, J., Geirsdóttir, Á. & Helgadóttir, G. 2002: Late Quaternary ice extent and depositional history from the Djúpáll trough off VestÞrdir peninsula, north-west Iceland: a stacked 36 cal Ky environmental record. Polar Res. 21, 211–226 (this issue).
    • Andrews, J. T., Geirsdóttir, Á., Hardardóttir, J., Principato, S., Kristjánsdóttir, G. B., Helgadóttir, G., Grönvold, K., Drexler, J. & Sveinbjörnsdóttir, Á. in press: Distribution, age, sediment magnetism, and geochemistry of the Saksunarvatn (10.18 ± cal ka) ash in marine, lake, and terrestrial sediments, NW Iceland. J. Quat. Sci.
    • Andrews, J. T., Smith, L. M., Preston, R., Cooper, T. & Jennings, A. E. 1997. Spatial and temporal patterns of iceberg rafting (IRD) along the East Greenland margin, ca. 68° N, over the last 14 cal. ka. J. Quat. Sci. 12, 1–13.
    • Bard, E., Fairbanks, R. G., Hamelin, B. & Zindler, A. 1990: Calibration of the 14C timescale over the past 30,000 years using mass spectrometric U–Th ages from Barbados corals. Nature 345, 405–410.
    • Bourgeois, O., Dauteil, O. & van Viet-Lanoe, B. 2000: Geothermal control on ice stream formation: ßow patterns of the Icelandic Ice Sheet at the Last Glacial Maximum. Earth Surf. Process. Landf. 25, 59–76.
    • Dickson, R. R., Meincke, J., Malmberg, S. & Lee, A. 1988: The “Great Salinity Anomaly” in the northern North Atlantic 1968–1982. Progr. Oceanogr. 20, 103–151.
    • Dowdeswell, J. A., Whittington, R. J., Jennings, A. E., Andrews, J. T., Mackensen, A. & Marienfeld, P. 2000: An origin for laminated glacimarine sediments through seaice build-up and suppressed iceberg rafting. Sedimentology 47, 557–576.
    • Geirsdóttir, Á., Hardardóttir, J. & Sveinbjörnsdóttir, Á. 2000: Glacial extent and catastrophic meltwater events during the deglaciation of southern Iceland. Quat. Sci. Rev. 19, 1749–1761.
    • Grobe, H. 1987: A simple method for the determination of icerafted debris in sediment cores. Polarforschung 57, 123–126.
    • Grönvold, K., Óskarsson, N., Johnsen, S. J., Clausen, H. B., Hammer, C. U., Bond, G. & Bard, E. 1995: Ash layers from Iceland in the Greenland GRIP ice core correlated with oceanic and land sediments. Earth Planet. Sci. Lett. 135, 149–155.
    • Hjort, C., Norddahl, H. & Ingólfsson, Ó. 1985: Late Quaternary geology and glacial history of Hornstrandir, northwest Iceland: a reconnaissance study. Jökull 35, 9–29.
    • Ingólfsson, Ó. & Norddahl H. 2001: High relative sea level during the Bølling interstadial in western Iceland: a reßection of ice-sheet collapse and extremely rapid glacial unloading. Arct. Antarct. Alp. Res. 33, 231–243.
    • Jennings, A., Syvitski, J., Gerson, L., Grönvold, K., Geirsdóttir, Á., Hardardóttir, J., Andrews, J. & Hagen, S. 2000: Chronology and paleoenvironments during the Late Weichselian deglaciation of the SW Iceland shelf. Boreas 29, 167–183.
    • Lønne, I. 1995: Sedimentary facies and depositional architecture of ice-contact glaciomarine systems. Sediment. Geol. 98, 13–43.
    • Norddahl, H. 1991: Late Weichselian and early Holocene deglaciation history of Iceland. Jökull 40, 27–50.
    • Norddahl, H. & Pétursson, H. 2002: Marine-limit shorelines and LGM glacier extent in SW VestÞrdir, Iceland. In S. S. Jónsson (ed.): Abstract volume, 25th Nordic Geological Winter Meeting, Reykjavík, 6 - 9 January 2002.
    • O Cofaigh, C. & Dowdeswell, J. A. 2001: Laminated sediments in glacimarine environments: diagnostic criteria for their interpretation. Quat. Sci. Rev. 20, 1411–1436.
    • Ólafsdóttir, S. 2002: Endurvarpsgögn, kornastaerdardreiÞng og ísrekid efni í setkjarna frá Djúpál (MD99-2264) á tímabilinu 9.600 - 12.800 14C BP. (Analysis of a chirp proÞle, grain size distribution and IRD record from Djúpáll, the period 9,600 - 12,800 14C years BP). BSc thesis, University of Iceland.
    • Smith, L. M. & Licht, K. J. 2000: Radiocarbon date list IX: Antarctica, Arctic Ocean, and the northern North Atlantic. Boulder: INSTAAR, University of Colorado.
    • Stein, R., Nam, S.-I., Grobe, H. & Hubberten, H. 1996: Late Quaternary glacial history and short-term ice-rafted debris ßuctuations along the East Greenland continental margin. In J. T. Andrews et al. (eds.): Late Quaternary palaeoceanography of the North Atlantic margin. Spec. Publ. 111. Pp. 135–151. Geological Society of London.
    • Stokes, C. R. & Clark, C. D. 2001: Palaeo-ice streams. Quat. Sci. Rev. 20, 1437–1457.
    • Stuiver, M. & Reimer, P. J. 1986: Extended 14C data base and revised CALIB 3.0 14C age calibartion program. Radiocarbon 35, 215–230.
    • Syvitski, J. P. M., Jennings, A. E. & Andrews, J. T. 1999: High-resolution seismic evidence for multiple glaciations across the southwest Iceland shelf. Arct. Antarct. Alp. Res. 31, 50–57.
    • Syvitski, J. P. M., LeBlanc, K. W. G. & Cranston, R. E. 1990: The ßux and preservation of organic carbon in BafÞn Island fjords. In J. A. Dowdeswell & J. D Scourse (eds.): Glacimarine environments: processes and sediments. Spec. Publ. 53. Pp. 177–200. Geological Society of London.
    • Thórdardóttir, T. 1984: Primary production north of Iceland in relation to water masses in May–June 1970–1980. C.M. 1984/L20, 1–17. Council for the Exploration of the Sea.
    • Thors, K. & Helgadóttir, G. 1999: Seismic reßection proÞles from Ísafjardardjúp, JökulÞrdir, and Djúpáll, NW Iceland. Geological Society of America, Abstract volume 31, A74.
    • Vorren, T. O., Hald, M., & Thomsen, E. 1984: Quaternary sediments and environments on the continental shelf off northern Norway. Mar. Geol. 57, 229–257.
    • Walden, J., OldÞeld, F. & Smith, J. (eds.) 1999: Environmental magnetism: a practical guide. London: Quaternary Research Association.
  • No related research data.
  • Discovered through pilot similarity algorithms. Send us your feedback.

Share - Bookmark

Cite this article

Collected from