부산대학교 도서관

To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/0012-821X(95)00145-3 Byline: Karl Gronvold (a), Niels Askarsson (a), Sigfus J. Johnsen (b)(c), Henrik B. Clausen (b), Claus U. Hammer (b), Gerard Bond (d), Edouard Bard (e) Abstract: Four previously known ash layers (Ash Zones I and II, Saksunarvatn and the Settlement layer) all originating in Iceland, have been identified in the Central Greenland ice core GRIP. This correlation of the ash between the different environments is achieved by comparison of the chemical composition of glass shards from the ash. This establishes and confirms detailed correlations between the different types of depositional records and the absolute dating of the younger part of the ice core by counting annual layers dates the eruptions accurately. A precise connection with dates obtained by.sup.14C beyond the range of dendrochronology is established which provides an excellent confirmation of.sup.230Th-.sup.234U dates from corals. Four additional Icelandic ash layers have also been identified in the core but not yet correlated with known ash deposits. Author Affiliation: (a) Nordic Volcanological Institute, Geoscience Building, University of Iceland, 101 Reykjavik, Iceland (b) The Niels Bohr Institute, Department of Geophysics, University of Copenhagen, Haraldsgade 6, DK-2200 Copenhagen N, Denmark (c) Science Institute, Dunhaga 3, University of Iceland, 107 Reykjavik, Iceland (d) Lamont-Doherty Geological Observatory, Columbia University, Palisades, NY 10964, USA (e) CEREGE, CNRS - Universited'Aix-Marseille III, JE 192, sce 431, Facultede St. Jerome, 13397 Marseille Cedex 20, France Article History: Received 21 June 1995; Accepted 26 July 1995