[Folda] [Jhi] Friday Seminar - today, 12:30 - Thor Thordarson: "Holocene tephra stratigraphy in the western half of Iceland"

[Maren Kahl]

Dear all,

 

our seminar series continues today at 12:30 in the seminar room on the 3rd
floor with a presentation given by:

Thor Thordarson "Holocene tephra stratigraphy in the western half of
Iceland"

In the last 12 ka explosive basalt to rhyolite eruptions in Iceland have
produced numerous widespread tephra fall deposits with typical recurrence
intervals on the order of decades. Consequently, Icelandic tephrochronology
has a prominent role in paleoclimate studies in the North Atlantic because
tephra horizons are excellent age and stratigraphic markers in Holocene
sedimentary archives and help with establishing timing of climate modifying
events. Comprehensive and accurate chronologies within Iceland are essential
because they underpin our understanding of the far-field chronologies and
help with tephra detection and discrimination. They are equally important
for studies concerning history and nature of explosive volcanism.

Over the last 15 years we have seen momentous improvements in the records of
Holocene tephra stratigraphy in Iceland, in which the expansion of the
traditional soil-based tephra studies to include glacial, lacustrine and
marine sediment archives has played a pivotal role. The tephra stratigraphy
used for correlation of these sedimentary archives is underpinned by robust
geochemical characterization of each tephra layer. A comprehensive tephra
source identification system has been established via comprehensive
geochemical reference tephra data base, which allows for methodical
identification of the source volcanic system and often the source eruption.
In this lecture, I review studies concerning the tephra identification and
stratigraphy in lacustrine sediments within lakes in south, central, west
and northwest Iceland.

 

 

Maria & Maren



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