Holocene tephra from Iceland and Alaska in SE Greenland Shelf Sediments

摘要: The record of Icelandic volcanic events in Holocene marine sediments off SE Greenland provides evidence for the frequency and timing atmospheric tephra plume dispersal from Iceland towards Greenland. Geochemistry abundance peaks from two shelf cores: MD99-2322 JM96-1215-2GC are compared with core MD99-2269, north shelf, to evaluate direction eruptions. Glass shard counts (106–1000 µm) revealed 16 distinct cryptotephra peaks. Geochemical analyses eight cryptotephra JM96-1215 indicate sources volcanic systems Alaska. A layer matching geochemistry stratigraphy c. 3600 BP eruption Aniakchak Volcano Aleutian Islands was identified JM96-1215/2GC. Settlement Tephra (AD 871±2) Hekla B (H-B) were MD99-2322. new marker horizon, Katla EG-6.73, found both Greenland cores. Three basaltic between 9.9 10.4 cal kyr BP, exhibit major-element indistinguishable the 10.2 Saksunarvatn tephra. These layers represent 3 out of≥seven westward northward-dispersed Grimsvotn found on BP.