<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class=""><div class="">Dear all,</div><div class=""><br class=""></div><span class="">the Friday seminar series continues this Friday (31 March) at 12:30 in the seminar room on the 3rd floor with a presentation given by:<br class=""><br class=""><span class=""><b class="">Thor Thordarson </b></span></span><span class=""><b class="">"</b></span><span class=""><b class="">Holocene tephra stratigraphy in the western half of Iceland"</b><br class=""></span><span style="text-align: justify;" class=""><br class=""></span></div><div class=""><div style="text-align: start;" class=""><span style="text-align: justify;" class="">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.</span></div><span class=""><p class="MsoNormal" style="text-align:justify"><o:p class=""></o:p></p><p class="MsoNormal" style="text-align:justify">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.<o:p class=""></o:p></p>
<!--EndFragment--><br class=""><br class=""></span></div><div class=""><span class=""><br class=""></span></div><span class="">Maren & Maria</span><div class=""><br class=""><div class="">
<div style="color: rgb(0, 0, 0); letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="color: rgb(0, 0, 0); letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="color: rgb(0, 0, 0); letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">_____________________________</div><div style="color: rgb(0, 0, 0); letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Maria H. Janebo<br class="">Postdoctoral Research Fellow<br class=""><br class="">Nordic Volcanological Center<br class="">Institute of Earth Sciences<br class="">University of Iceland, Askja 223<br class="">Sturlugata 7, 101 Reykjavik, Iceland</div></div></div>
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