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HOLOCENE GLACIAL HISTORY OF THE DRANGAJöKULL ICE CAP, NW ICELAND, BASED ON LAKE SEDIMENT RECORDS


SCHOMACKER, Anders1, LARSEN, Nicolaj Krog2, BRYNJÓLFSSON, Skafti1, GUDMUNDSDÓTTIR, Esther Ruth3, ANDREASSEN, Julie2, HÅKANSSON, Lena1 and INGÓLFSSON, Ólafur4, (1)Department of Geology, Norwegian University of Science and Technology, Sem Saelands Veg 1, Bergbygget, Trondheim, N-7491, Norway, (2)Department of Geoscience, Aarhus University, Høegh-Guldbergs Gade 2, Aarhus, 8000, Denmark, (3)Nordvulk, Institute of Earth Sciences, University of Iceland, Askja, Sturlugata 7, Reykjavík, IS-101, Iceland, (4)Institute of Earth Sciences, University of Iceland, Askja, Sturlugata 7, Reykjavík, IS-101, Iceland, anders.schomacker@ntnu.no

The Drangajökull ice cap is located at the northwestern peninsula (Vestfirðir) of Iceland. It is the fifth largest ice cap in Iceland and presently has an area of about 142 km2. It descends from c. 915 m a.s.l. and the main ice drainage takes place through three surge-type outlets in valleys on the northeastern, southwestern, and western side of the ice cap. Drangajökull rests on Neogene plateau basalts with numerous lakes around the ice cap. Compared to the other ice caps in Iceland, little is known about the Holocene glacial history of Drangajökull.

We cored lakes around the ice cap in order to reconstruct the Holocene glacial history of Drangajökull from the lacustrine sedimentary records. Some of the lakes are threshold lakes, i.e. they only receive glacial meltwater when the ice cap is much more extensive than at present. Other lakes receive glacial meltwater at present. The lake sediment cores were split open, described, photographed, sampled, XRF scanned, magnetic susceptibility measured. The chronology is based on tephra stratigraphy and 14C dating of macrofossils recovered from gyttja in the cores. Here, we present preliminary results from analyses of the lake sediment cores and discuss their implications for the Holocene glacial history of Drangajökull.

Session No. 230

T30. Past Records and Future Challenges of Glacier and Ice Sheet Response to Climate Change (Posters): Honoring and Building on the Legacy of Mark Meier
Tuesday, 29 October 2013: 9:00 AM-6:30 PM
Hall D (Colorado Convention Center)
Geological Society of America Abstracts with Programs. Vol. 45, No. 7, p.551
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