[Folda] Fwd:?==?utf-8?q? [Jhi] Reminder - Today's Seminar 12:30 - Maxwell Brown: Advances in archaeomagnetic dfating in Britain

[Siqi Li]

-------- Original Message -------- 
Subject: [Jhi] Reminder - Today's Seminar 12:30 - Maxwell Brown: Advances in archaeomagnetic dating in Britain 
Date: Friday, September 1, 2017 08:03 GMT 
From: Maxwell Christopher Brown <maxwell at hi.is> 
To: jhi at hi.is 
 
 
Dear all,

Today's seminar will be given by:

Maxwell Brown (Research Specialist - Institute of Earth Sciences, 
University of Iceland)

Title: Advances in archaeomagnetic dating in Britain

Abstract: Earth's magnetic field varies on a range of timescales. Prior 
to historical observations of the field we rely upon the magnetic 
recording capacity of volcanic rocks, archaeological materials and 
sediments to unravel past field changes. Over the past 13 years we have 
developed GEOMAGIA50, an online database of palaeomagnetic data from 
archaeological materials, volcanic rocks and sediments spanning the past 
50 ka. Since the last revision in July 2015 we have completed a major 
update to the database. Although, there is a wealth of archaeomagnetic 
data from the UK, it was poorly represented in the most recent version 
of the database. We reassessed all UK data in the database and added a 
large number of new entries. Archaeomagnetic data from the UK now 
represents the largest contribution from any country. One particularly 
useful application of the new UK compilation is for archaeomagnetic 
dating (matching the field direction recorded by an archaeological 
artefact to that of a dated reference curve of directional variations).  
The previous dating curve developed in 1988, and used almost solely for 
dating in the UK, considered only a fraction of the data in our new 
compilation and was in need of revision. With this vastly improved data 
set we have derived a new archaeomagnetic dating curve for the UK, 
through the development of a temporally continuous geomagnetic field 
model. Similar approaches can be applied to palaeomagnetic data from 
well dated Icelandic lavas. When combined with data from sediments and 
archaeological materials there is potential to develop an Icelandic 
dating curve that can be used to refine our knowledge of the 
post-glacial ages of Icelandic lavas.

Date: Friday, 1st September
Time: 12:30
Place: 3rd Floor meeting room, Askja

All are welcome.
Best wishes
Maxwell

-- 
Maxwell Brown
Research specialist
Institute of Earth Sciences
University of Iceland
Askja, Room 333
Sturlugata 7
101 Reykjavík
Iceland
  
email:maxwell at hi.is
tel (office): +354-525-4730
tel (lab): +354-525-4794
tel (mobile): +354-832-0015