Geochemistry of Holocene cryptotephras from the North Iceland Shelf (MD99-2269): intercalibration with radiocarbon and palaeomagnetic chronostratigraphies
Restricted accessResearch articleFirst published online February, 2007
Geochemistry of Holocene cryptotephras from the North Iceland Shelf (MD99-2269): intercalibration with radiocarbon and palaeomagnetic chronostratigraphies
Tephra-grain counting, morphology and geochemistry in the 150–1000 μm size fraction were used to identify 22 individual tephra horizons and one visible tephra layer (Saksunarvatn) from postglacial sediment of the north Iceland shelf. Core MD99-2269 (66°37.53‘N, 20°51.16‘W, water depth 365 m, length 2533 cm) from the Reykjafjardaráll basin is constrained at the base by the Vedde tephra (c. 12 000 cal. yr BP). Geochemical analyses and stratigraphical position of the 22 tephra horizons were used to identify the following cryptotephras: KOL-1372 (AD 1372), Hekla 1104 (AD 1104), Snæfellsnes 1 (c. 1790 cal. yr BP), Hekla 3 (c. 2970 cal. yr BP), Hekla 4 (c. 4230 cal. yr BP), TV 5 (c. 6860 cal. yr BP) and Suduroy (c. 8070 cal. yr BP). A tephra of the same geochemistry as KOL-1372 was found near the base of the core and is here named KOL3-2269 (>11 000 cal. yr BP). Eleven additional cryptotephras were geochemically typed to their respective Icelandic volcanic centres of origin and their ages constrained. Four tephra horizons had a very heterogeneous geochemical signal and may reflect secondary rather than primary deposition although we speculate whether the heterogeneity may be due to mixing of distinct cryptotephras within our sample. The cryptotephras and one visible tephra layer (Saksunarvatn) were intercalibrated with the combined MD99-2269 and MD99-2322 (67°08.18‘N, 30°49.67‘W, 714 m water depth, length 2617 cm) palaeomagnetic secular variation record, in depth and on a calibrated radiocarbon chronology, providing a fundamental chronological and stratigraphic template for future studies of environmental and volcanic variability for the Icelandic region, eastern North Atlantic and NW Europe.
Andersen, C. , Koc, N. , Jennings, A. and Andrews, J. T.2004: Nonuniform response of the major surface currents in the Nordic Seas to insolation forcing: implications for the Holocene climate variability . Paleoceanography19, 10.1029/2002PA000873.
2.
Andrews, J. T. , Helgadóttir, G. , Geirsdóttir, á. and Jennings, A. E.2001: Multicentury-scale records of carbonate (hydrographic?) variablity on the N. Iceland margin over the last 5000 yrs . Quaternary Research56, 199-206 .
3.
Andrews, J. T. , Geirsdóttir, á. , Hardardóttir, J. , Principato, S. , Kristjánsdóttir, G. B. , Helgadóttir, G. , Grönvold, K. , Drexler, J. and Sveinbjörnsdóttir, á.2002a: Distribution, sediment magnetism, and geochemistry of the Saksunarvatn (10.180∓60 cal. yr BP) tephra in marine, lake, and terrestrial sediments, northwest Iceland . Journal of Quaternary Science17, 731-745 .
4.
Andrews, J. T. , Hardardóttir, J. , Geirsdóttir, á. and Helgadóttir, G.2002b: Late Quaternary ice extent and glacial history from the Djúpáll trough, off Vestfirdir peninsula, north-west Iceland: a stacked 36 cal. ky environmental record . Polar Research21, 211-226 .
5.
Andrews, J. T. , Hardardóttir, J. , Kristjánsdóttir, G. B. , Grönvold, K. and Stoner, J.2003a: A high resolution Holocene sediment record from Húnflóaáll, N. Iceland margin: century to millenial-scale variability since the Vedde tephra . The Holocene13, 625-638 .
6.
Andrews, J. T. , Hardardóttir, J. , Stoner, J. S. , Mann, M. E. , Kristjánsdóttir, G. B. and Koc, N.2003b: Decadal to millennial-scale periodicities in North Iceland shelf sediments over the last 12,000 cal. yrs: long-term North Atlantic oceanographic variability and solar forcing . Earth and Planetary Science Letters210, 453-465 .
7.
Andrews, J. T. , Eberle, D. D. and Kristjánsdóttir, G. B.2006: A new method to detect cryptotephras in sediments from quantitative XRD scans . The Holocene16, 1035-1042 .
8.
Asprey, K. W. , Syvitski, J. P. M. , Andrews, J. T. and Dowdeswell, J. A.1993: CANAM-PONAM Cruise HU93030: West Iceland to East Greenland. Geological Survey of Canada .
9.
Austin, W. E. , Wilson, L. J. and Hunt, J. B.2004: The age and chronostratigraphical significance of north Atlantic Ash Zone II . Journal of Quaternary Science19, 137-146 .
10.
Austin, W. E. N. , Bard, E. , Hunt, J. B. , Kroon, D. and Peacock, J. D.1995: The 14C of the Icelandic Vedde Ash: implications for Younger Dryas marine reservoir age corrections . Radiocarbon37, 53-63 .
11.
Bard, E. , Arnold, M. , Mangerud, J. , Paterne, M. , Labeyrie, L. , Duprat, J. , Melieres, M.-A. , Sønstegaard, E. and Duplessy, J.-C.1994: The North Atlantic atmosphere-sea surface 14C gradient during the Younger Dryas climatic event . Earth and Planetary Science Letters126, 275-287 .
12.
Birks, H. H. , Gulliksen, S. , Haflidason, H. , Mangerud, J. and Possnert, G.1996: New radiocarbon dates for the Vedde ash and the Saksunarvatn ash from Western Norway . Quaternary Research45, 119-127 .
13.
Björck, J. and Wastegård, S.1999: Climate oscillations and tephrachronology in eastern middle Sweden during the last glacial-interglacial transition . Journal of Quaternary Science14, 399-410 .
14.
Björck, S. , Ingólfsson, ó. , Haflidason, H. , Hallsdóttir, M. and Anderson, N. J.1992: Lake Torfadalsvatn: a high resolution record of the North Atlantic ash zone I and the last glacial-interglacial environmental changes in Iceland . Boreas21, 15-22 .
15.
Blockley, S. P. E. , Pyne-O’Donnell, S. D. F. , Lowe, J. J. , Matthews, I. P. , Stone, A. , Pollard, A. M. , Turney, C. S. M. and Molyneux, E. G.2005: A new and less destructive laboratory procedure for the physical separation of distal glass tephra shards from sediments . Quaternary Science Reviews24, 1952-1960 .
16.
Bond, G. , Mandeville, C. and Hoffman, S.2001: Were rhyolitic glasses in the Vedde ash and in the North Atlantic Ash Zone 1 produced by the same volcanic eruption ? Quaternary Science Reviews20, 1189-1199 .
17.
Boygle, J. 1994: Tephra in lake sediments: an unambiguous geochronological marker? Ph.D. thesis, University of Edinburgh.
18.
Boygle, J.1999: Variability of tephra in lake and catchment sediments, Svínavatn, Iceland . Global and Planetary Change21, 129-149 .
19.
Boygle, J.2004: Towards a Holocene tephrachronology for Sweden: geochemistry and correlation with the North Atlantic tephra stratigraphy . Journal of Quaternary Science19, 103-109 .
20.
Caseldine, C. and Hatton, J.1994: Interpretation of Holocene climatic change for the Eyjafjördur area of northern Iceland from pollen analytical data: comments and preliminary results. In Stötter, J. and Wilhelm, F. , editors, Environmental change in Iceland. Geobuch-Verlag , 257-273.
21.
Caseldine, C. , Geirsdóttir, á. and Langdon, P. G.2003: Efstadalsvatn - a multi-proxy study of a Holocene lacustrine sequence from NW Iceland . Journal of Paleolimnology30, 55-73 .
22.
Castaneda, I. S. , Smith, L. M. , Kristjánsdóttir, G. B. and Andrews, J. T.2004: Temporal changes in Holocene δ 18O records from the northwest and central North Iceland shelf . Journal of Quaternary Science19, 321-334 .
23.
Davies, S. M. , Turney, C. S. M. and Lowe, J. J.2001: Identification and significance of a visible, basalt-rich Vedde ash layer in a Late-glacial sequence on the Isle of Skye, Inner Hebrides, Scotland . Journal of Quaternary Science16, 99-104 .
24.
Davies, S. M. , Wastegård, S. and Wohlfarth, B.2003: Extending the limits of the Borrobol Tephra to Scandinavia and detection of new early Holocene tephras . Quaternary Research59, 345-352 .
25.
Dugmore, A. J. and Newton, A. J.1998: Holocene tephra layer in the Faroe Islands . Fródskaparrit46, 191-204 .
26.
Dugmore, A. J. , Newton, A. J. and Sugden, D. E.1992: Geochemical stability of fine-grained silicic Holocene tephra in Iceland and Scotland . Journal of Quaternary Science7, 173-183 .
27.
Dugmore, A. J. , Larsen, G. and Newton, A. J.1995: Seven tephra isochrones in Scotland . The Holocene5, 257-266 .
28.
Dunhill, G. , Andrews, J. T. and Kristjánsdóttir, G. B.2004: Radiocarbon date list X: Baffin Bay, Baffin Island, Iceland, Labrador Sea, and the northern North Atlantic. Institute of Arctic and Alpine Research .
29.
Einarsson, T.1961: Pollenanalytische Untersuchungen zur spat- und postglazialen Klimageschichte Islands . Sonderveroffenlichungen des Geologischen Institutes der Universitat Köln6, 52-52 .
30.
Eiríksson, J. , Knudsen, K. L. , Haflidason, H. and Heinemeier, J.2000a: Chronology of late Holocene climatic events in the northern North Atlantic based on AMS 14C dates and tephra markers from the volcano Hekla, Iceland . Journal of Quaternary Science15, 573-580 .
31.
Eiríksson, J. , Knudsen, K. L. , Haflidason, H. and Henriksen, P.2000b: Late-glacial and Holocene palaeoceanography of the North Icelandic shelf . Journal of Quaternary Science15, 23-42 .
32.
Eiríksson, J. , Larsen, G. , Knudsen, K. L. , Heinemeier, J. and Símonarson, L. A.2004: Marine reservoir age variability and water mass distribution in the Iceland Sea . Quaternary Science Reviews23, 2247-2268 .
33.
Geirsdóttir Á. , Andrews, J. T. , ólafsdóttir, S. , Helgadóttir, G. and Hardardóttir, J.2002: A 36 ka record of iceberg rafting and sedimentation from north-west Iceland . Polar Research21, 291-298 .
34.
Giraudeau, J. , Jennings, A. E. and Andrews, J. T.2004: Timing and mechanisms of surface and intermediate water circulation changes in the Nordic Seas over the last 10,000 years: a view from the North Iceland Shelf . Quaternary Science Reviews23, 2127-2139 .
35.
Grönvold, K. , óskarsson, N. , Johnsen, S. J. , Clausen, H. B. , Hammer, C. U. , Bond, G. and Bard, E.1995: Ash layer from Iceland in the Greenland GRIP core correlated with oceanic and land sediments . Earth and Planetary Science Letters135, 149-155 .
36.
Gudmundsdóttir, E. R. , Eiríksson, J. , Larsen, G. and Knudsen, K.-L. 2004: Tephrochronology and sedimentation on the north Iceland shelf during the last two millennia . 8th international conference on paleoceanography. An ocean view of global change, Volume Program and Abstracts. Biarritz, France, UMR 5808 EPOC, CNRS, Bordeaux I University, p. 160-160 .
37.
Gulliksen, S. , Birks, H. H. , Possnert, G. and Mangerud, J.1998: A calendar age estimate of the Younger Dryas-Holocene boundary at Krakenes, western Norway . The Holocene8, 249-259 .
38.
Häberle, T.1991: Holocene glacial history of the Hörgárdalur area, Tröllaskagi, Northern Iceland. In Maizels, J. K. and Caseldine, C. , editors, Environmental change in Iceland: past and present. Kluwer Academic Publishers , 193-202.
39.
Haflidason, H. 1983: The marine geology of Eyjafjördur, North Iceland: sedimentological, petrographical and stratigraphical studies. Ph.D. thesis, University of Edinburgh.
40.
Haflidason, H. , Larsen, G. and ólafsson, G.1992: The recent sedimentation history of Thingvallavatn, Iceland . Oikos64, 80-95 .
41.
Haflidason, H. , Eiríksson, J. and Van Kreveld, S.2000: The tephrochronology of Iceland and the North Atlantic region during the middle and late Quaternary: a review . Journal of Quaternary Science15, 3-22 .
42.
Hald, M. and Jennings, A. E.1996: R/V Jan Mayen Greenland Iceland margin, 1996 cruise report. University of Tromso .
43.
Hall, V. A. and Pilcher, J. R.2002: Late-Quaternary Icelandic tephras in Ireland and Great Britain: detection, characterization and usefulness . The Holocene12, 223-232 .
44.
Hall, V. A. , Pilcher, J. R. and McCormac, F. G.1994: Icelandic volcanic ash and mid-Holocene Scots pine (Pinus sylvestris) decline in the north of Ireland: no correlation . The Holocene4, 79-83 .
45.
Hammer, C. U. , Clausen, H. B. and Dansgaard, W.1980: Greenland ice sheet evidence of post-glacial volcanism and its climatic impact . Nature288, 230-235 .
46.
Helgadóttir, G. 1997: Paleoclimate (0 to >14 ka) of W and NW Iceland: an Iceland/USA contribution to PALE. Cruise report B9 97 R/V Bjarni Sæmundsson RE30, 17-30 July 1997. Hafrannsóknastofnun (Marine Research Institute).
47.
Hillaire-Marcel, C. and Turon, J.-L.1999: IMAGES 5 on board the Marion Dufresne 2nd leg 30 June 24 July 1999. Geological Survey of Canada .
48.
Hjort, C. , Norddahl, H. and Ingólfsson, Ó.1985: Late Quaternary geology and glacial history of Hornstrandir, Northwest Iceland: a reconnaissance study . Jö kull35, 9-29 .
49.
Hughen, K. , Baillie, M. , Bard, E. , Bayliss, A. , Beck, J. , Bertrand, C. , Blackwell, P. , Buck, C. , Burr, G. , Cutler, K. , Damon, P. , Edwards, R. , Fairbanks, R. , Friedrich, M. , Guilderson, T. , Kromer, B. , McCormac, F. , Manning, S. , Bronk Ramsey, C. , Reimer, P. , Reimer, R. , Remmele, S. , Southon, J. , Stuiver, M. , Talamo, S. , Taylor, F. , van der Plicht, J. and Weyhenmeyer, C.2004: Marine04 marine radiocarbon age calibration, 26-0 ka BP . Radiocarbon46, 1059-1086 .
50.
Hunt, J. B. and Hill, P. G.1993: Tephra geochemistry: a discussion of some persistent analytical problems . The Holocene3, 271-278 .
51.
Hunt, J. B. , Fannin, N. G. T. , Hill, P. G. and Peacock, J. D.1995: The tephrochronology and radiocarbon dating of North Atlantic, Late-Quaternary sediments: an example from the St. Kilda basin. In Scrutton, R. A. , Stoker, M. S. , Shimmield, G. B. and Tudhope, A. W. , editors, The tectonics, sedimentation and palaeoceanography of the North Atlantic Region. The Geological Society of London: Geological Society Special Publication No. 90, 227-248.
52.
Ingólfsson, Ó.1995: Rapid isostatic rebound in southwestern Iceland at the end of the last glaciation . Boreas24, 245-259 .
53.
Jackson A. , Jonkers, A. R. T. and Walker, M. R.2000: Four centuries of geomagnetic secular variation from historical records . Philosophical Transactions of the Royal Society of London, A358, 957-990 .
54.
Jennings, A. E. , Grönvold, K. , Hilberman, R. , Smith, M. and Hald, M.2002: High resolution study of Icelandic tephras in the Kangerlussuaq Trough, SE East Greenland, during the last deglaciation . Journal of Quaternary Science17, 747-757 .
55.
Jiang, H. , Seidenkrantz, M.-S. , Knudsen, K. L. and Eiríksson, J.2002: Late-Holocene summer sea-surface temperatures based on a diatom record from the north Icelandic shelf . The Holocene12, 137-147 .
56.
Jóhannsdóttir, G. E. 2003: Gjóskulög í sjávarseti og jardvegssnidum á Vestfjördum (Tephra in marine and terrestrial sediment in Vestfirdir, NW Iceland). B.Sc. thesis, University of Iceland.
57.
Jónsdóttir, H. B. B. 2001: Late Holocene climatic changes on the North Iceland shelf. MSc thesis, University of Aarhus.
58.
Kirkbride, M. P. and Dugmore, A. J.2001: Timing and significance of mid-Holocene glacier advances in northern and central Iceland . Journal of Quaternary Science16, 145-153 .
59.
Knudsen, K. L. and Eiríksson, J.2002: Application of tephrochronology to the timing and correlation of paleoceanographic events recorded in Holocene and Late Glacial shelf sediments off North Iceland . Marine Geology191, 165-188 .
60.
Knudsen, K.-L. , Jiang, H. , Jansen, E. , Eiríksson, J. , Heinemeier, J. and Seidenkrantz, M.-S.2004a: Environmental changes off North Iceland during the deglaciation and the Holocene: foraminifera, diatoms and stable isotopes . Marine Micropaleontology953, 1-33 .
61.
Knudsen, K. L. , Eiríksson, J. , Jansen, E. , Jiang, H. , Rytter, F. and Gudmundsdóttir, E. R.2004b: Paleoceanographic changes off North Iceland through the last 1200 yrs: foraminifera, stable isotopes, diatomes and ice rafted debris . Quaternary Science Reviews23, 2231-2246 .
62.
Kristjánsdóttir, G. B. 1999: Late Quaternary climatic and environmental changes on the North Iceland shelf, evidence from sedimentological and geochemical analysies of marine sediment cores. MSc thesis, University of Iceland.
63.
Kristjánsdóttir, G. B. 2005: Holocene climatic and environmental changes on the Iceland shelf: δ 18O, Mg/Ca, and tephrochronology of core MD99-2269. Ph.D. thesis, University of Colorado.
64.
Kvamme, T. , Mangerud, J. , Furnes, H. and Ruddiman, W. F.1989: Geochemistry of Pleistocene ash zones in cores from the North Atlantic . Norsk Geologisk Tidskrift69, 251-272 .
65.
Labeyrie, L., Jansen, E. and Cortijo, E. 2003: Les rapports de campagnes a la mer MD114/IMAGES V. Institut Polaire Francais.
66.
Lacasse, C. , Sigurdsson, H. , Carey, S. , Paterne, M. and Guichard, F.1996: North Atlantic deep-sea sedimentation of Late Quaternary tephra from the Iceland hotspot . Marine Geology129, 207-235 .
67.
Lackschewitz, K. S. and Wallrabe-Adams, H.-J.1997: Composition and origin of volcanic ash zones in Late Quaternary sediments from the Reykjanes Ridge: evidence for ash fallout and ice-rafting . Marine Geology136, 209-224 .
68.
Langdon, P. G. and Barber, K. E.2001: New Holocene tephras and a proxy climate record from a blanket mire in northern Skye, Scotland . Journal of Quaternary Science16, 753-759 .
69.
Larsen, G. and Thórarinsson, S.1977: H4 and other acid Hekla Jotephra layers . Jö kull27, 28-46 .
70.
Larsen, G. , Dugmore, A. and Newton, A.1999: Geochemistry of historical-age silicic tephras in Iceland . The Holocene9, 463-471 .
71.
Larsen, G. , Eiríksson, J. , Knudsen, K. L. and Heinemeier, J.2002: Correlation of late Holocene terrestrial and marine tephra markers, north Iceland: implications for reservoir age changes . Polar Research21, 283-290 .
72.
Lowe, D. J. and Hunt, A. S.2001: A summary of terminology used in tephra-related studies . Les Dossiers de l’Archeo-Logis1, 17-22 .
73.
Lowe, J. J. and Turney, C. S. M.1997: Vedde ash layer discovered in a small lake basin on the Scottish mainland . Journal of the Geological Society, London154, 605-612 .
74.
Lund, S. P.1996: A comparison of paleomagnetic secular variation records from North America . Journal of Geophysical Research101, 8007-8024 .
75.
Mangerud, J. , Lie, S. E. , Furnes, H. , Kristiansen, I. L. and Lømo, L.1984: A Younger Dryas ash bed in western Norway, and its possible correlations with tephra in cores from the Norwegian sea and the North Atlantic . Quaternary Research21, 85-104 .
76.
Mangerud, J. , Furnes, H. and Johansen, J.1986: A 9000-year-old ash bed on the Faroe Islands . Quaternary Research26, 262-265 .
77.
Mortensen, A. K. , Bigler, M. , Grönvold, K. , Steffensen, J. P. and Johnsen, S. J.2005: Ash layers from the Last Glacial Termination in the NGRIP ice core . Journal of Quaternary Science20, 209-219 .
78.
Norddahl, H. and Haflidason, H.1992: The Skógar Tephra, a Younger Dryas marker in North Iceland . Boreas21, 23-41 .
79.
Ojala, A. E. K. and Tiljander, M.2003: Testing the fidelity of sediment chronology: comparison of varve and paleomagnetic results from Holocene lake sediments from central Finland . Quaternary Science Reviews22, 1787-1803 .
80.
Ólafsdóttir, S. , Stoner, J. , Geirsdóttir, Á. , Miller, G. H. and Channell, J.2005: High-resolution Holocene paleomagnetic secular variation records from Iceland: towards marine terrestrial synchronization . AGU Fall Meeting, Eos Transactions AGU, 86(52), Fall Meeting Supplement, Abstract, U43A-0820.
81.
Pilcher, J. R. and Hall, V. A.1992: Towards a tephrochronology for the Holocene of the north Ireland . The Holocene2, 255-259 .
82.
Pilcher, J. R. , Hall, V. A. and McCormac, F. G.1995: Dates of Holocene Icelandic volcanic eruptions from tephra layers in Irish peats . The Holocene5, 103-110 .
83.
Pilcher, J. R. , Bradley, R. S. , Francus, P. and Anderson, L.2005: A Holocene tephra record from the Lofoten Islands, Arctic Norway . Boreas34, 136-156 .
84.
Plunkett, G. M. , Whitehouse, N. J. , Hall, V. A. , Brown, D. M. and Baillie, M. G. L.2004: A precisely-dated lake-level rise marked by diatomite formation in northeastern Ireland . Journal of Quaternary Science19, 3-7 .
85.
Principato, S.M. 2003: The Late Quaternary history of the eastern Ísafjardardjúp and Strandir areas of the Vestfirdir Peninsula, Iceland, using terrestrial and marine evidence. Ph.D. thesis, University of Colorado at Boulder.
86.
Ranner, P. H. , Allen, J. R. M. and Huntley, B.2005: A new early Holocence cryptotephra from northwest Scotland . Journal of Quaternary Science20, 201-208 .
87.
Ruddiman, W. F. and Glover, L. K.1972: Vertical mixing of icerafted volcanic ash in North Atlantic sediments . Geological Society of America Bulletin83, 2817-2836 .
88.
Rundgren, M.1995: Biostratigraphic evidence of the Allerød Younger Dryas Preboreal Oscillation in northern Iceland . Quaternary Research44, 405-416 .
89.
Rundgren, M.1998: Early-Holocene vegetation of northern Iceland: pollen and plant macrofossil evidence from the Skagi peninsula . The Holocene8, 553-564 .
90.
Rundgren, M. , Ingólfsson, ó. , Björck, S. , Jiang, H. and Haflidason, H.1997: Dynamic sea-level changes during the last deglaciation of northern Iceland . Boreas26, 201-215 .
91.
Rytter, F. 1998: Recente foraminiferes ökologi og sen-Holocaene klimafluktuationer i Islandshavet. M.Sc. thesis, University of Aarhus.
92.
Sejrup, H. P. , Sjøholm, J. , Furnes, H. , Beyer, I. , Eide, L. , Jansen, E. and Mangerud, J.1989: Quaternary tephrachronology on the Iceland Plateau, north of Iceland . Journal of Quaternary Science4, 109-114 .
93.
Sigvaldason, G. E.2002: Volcanic and tectonic processes coinciding with glaciation and crustal rebound: an early Holocene rhyolitic eruption in the Dyngjufjöll volcanic centre and the formation of the Askja caldera, north Iceland . Bulletin of Volcanology64, 192-205 .
94.
Sjoholm, J. , Sejrup, H. P. and Furnes, H.1991: Quaternary volcanic ash zones on the Iceland Plateau, southern Norwegian Sea . Journal of Quaternary Research6, 159-173 .
95.
Snowball, I. and Sandgren, P.2002: Geomagnetic field variations in northern Sweden during the Holocene quantified from varved lake sediments and their implications for cosmogenic nuclide production rates . The Holocene12, 517-530 .
96.
Snowball, I. and Sandgren, P.2004: Geomagnetic field intensity changes in Sweden between 9000 and 450 cal B.P.: extending the record of archaeomagnetic jerks by means of lake sediments and the pseudo-Thellier technique . Earth and Planetary Science Letters227, 361-376 .
97.
Stoner, J. S. , Jennings, A. , Kristjánsdóttir, G. B. , Dunhill, G. , Andrews, J. T. and Hardardóttir, J.2007: A paleomagnetic approach toward refining Holocene radiocarbon based chronologies: paleoceanographic records from North Iceland (MD99 2269) and East Greenland (MD99 2322) . Paleoceanography (in press).
98.
Stötter, J. , Wastl, M. , Caseldine, C. and Häberle, T.1999: Holocene palaeoclimatic reconstruction in northern Iceland: approaches and results . Quaternary Science Reviews18, 457-474 .
99.
Stuiver, M. and Reimer, P. J.1993: Extended 14C data base and revised CALIB 3.0 14C age calibration program . Radiocarbon35, 215-230 .
100.
Thompson, R.1984: A global review of paleomagnetic results from wet lake sediments. In Haworth, E. Y. and Lund, J. W. G. , editors, Lake sediments and environmental history. University of Minnesota Press , 145-165.
101.
Thórarinsson, S.1955: Nákuðungslögin vid Húnaflóa í ljósi nýrra aldursákvardanna . Náttúrufræðingurinn25, 172-186 (in Icelandic).
102.
Turney, C. S. M.1998: Extraction of rhyolitic component of Vedde microtephra from minerogenic lake sediments . Journal of Paleolimnology19, 199-206 .
103.
Turney, C. S. M. , Harkness, D. D. and Lowe, J. J.1997: The use of microtephra horizons to correlate Late-glacial lake sediment successions in Scotland . Journal of Quaternary Science12, 525-531 .
104.
Turney, C. S. M. , Lowe, J. J. , Davies, S. M. , Hall, V. A. , Lowe, D. J. , Wastegård, S. , Hoek, W. Z. , Alloway, B. , SCOTAVE and INTIMATE members2004: Tephrochronology of Last termination sequences in Europe: a protocol for improved analytical precision and robust correlation procedures (a joint SCOTAVE-INTIMATE proposal) . Journal of Quaternary Science19, 111-120 .
105.
van den Bogaard, C. and Schmincke, H.-U.2002: Linking the North Atlantic to central Europe: a high-resolution Holocene tephrochronological record from northern Germany . Journal of Quaternary Science17, 3-20 .
106.
van den Bogaard, C. , Dröfler, W. , Glos, R. , Nadeau, M. J. , Grootes, P. and Erlenkeuser, H.2002: Two tephra layers bracketing Late Holocene paleoecological changes in Northern Germany . Quaternary Researach57, 314-324 .
107.
Wallrabe-Adams, H.-J. and Lackschewitz, K. S.2003: Chemical composition, distribution, and origin of silicic volcanic ash layers in the Greenland-Iceland-Norwegian Sea: explosive volcanism from 10 to 300 ka as recorded in deep-sea sediment . Marine Geology193, 273-293 .
108.
Wastegård, S.2002: Early to middle Holocene silicic tephra horizons from the Katla volcanic system, Iceland: new results from the Faroe Islands . Journal of Quaternary Science17, 723-730 .
109.
Wastegård, S.2005: Late Quaternary tephrochronology of Sweden: a review . Quaternary International130, 49-62 .
110.
Wastegård, S. and Rasmussen, T. L.2001: New tephra horizons from Oxygen Isotope Stage 5 in the North Atlantic: correlation potential for terrestrial, marine and ice-core archives . Quaternary Science Reviews20, 1587-1593 .
111.
Wastegård, S. , Björck, S. , Possnert, G. and Wohlfarth, B.1998: Evidence for the occurrence of Vedde Ash in Sweden: radiocarbon and calendar age estimates . Journal of Quaternary Science13, 271-274 .
112.
Wastegård, S. , Turney, C. S. M. , Lowe, J. J. and Roberts, S. J.2000a: New discoveries of the Vedde ash in southern Sweden and Scotland . Boreas29, 72-78 .
113.
Wastegård, S. , Wohlfarth, B. , Subetto, D. A. and Sapelko, T. V.2000b: Extending the known distribution of the Younger Dryas Vedde ash into northwestern Russia . Journal of Quaternary Science15, 581-586 .
114.
Wastegård, S. , Björck, S. , Grauert, M. and Hannon, G. E.2001: The Mjauvotn tephra and other Holocene tephra horizons from the Faroe Islands: a link between the Icelandic source region, the Nordic Seas, and the European continent . The Holocene11, 101-109 .
115.
Wastegård, S. , Hall, V. A. , Hannon, G. E. , van den Bogaard, C. , Pilcher, J. R. , Sigurgeirsson, M. A. and Hermanns-Audardóttir, M.2003: Rhyolitic tephra horizons in northwestern Europe and Iceland from the AD 700s 800s: a potential alternative for dating first human impact . The Holocene13, 277-283 .
116.
Zielinski, G. A. , Germani, M. S. , Larsen, G. , Baillie, M. G. L. , Whitlow, S. , Twickler, M. S. and Taylor, K.1995: Evidence of the Eldgjá (Iceland) eruption in the GISP2 Greenland ice core: relationship to eruption processes and climatic conditions in the tenth century . The Holocene5, 129-140 .
117.
Zielinski, G. A. , Mayewski, P. A. , Meeker, L. D. , Grönvold, K. , Germani, M. S. , Whitlow, S. , Twickler, M. S. and Taylor, K.1997: Volcanic aerosol records and tephrochronology of the Summit, Greenland, ice cores . Journal of Geophysical Research102, 26 625-26 640 .
118.
Zillen, L. M. , Wastegård, S. and Snowball, I.2002: Calendar year ages of three mid-Holocene tephra layers identified in varved lake sediments in west central Sweden . Quaternary Science Reviews21, 1583-1591 .
