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January 2007

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Subject:
From:
Paul Bierman <[log in to unmask]>
Reply To:
In situ cosmogenic isotopes <[log in to unmask]>
Date:
Mon, 22 Jan 2007 19:48:19 -0500
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Dear Colleagues,

  You are invited to submit abstracts for the following session at  
the XVII INQUA Congress (Cairns, Australia, 28 July - 3 August 2007).  
Deadline for submission is 31st January 2007. Abstracts can now be  
submitted through: http://www.inqua2007.net.au/



We are looking forward to receiving your abstracts.

  ****************************************************************
Landscape evolution processes in semi-arid environments: new insights  
from OSL and cosmogenic nuclides:

David Fink (Australia), Ed Rhodes (Australia), Paul Bierman (USA)



Various methods and models have been used over the past few decades  
to study rates of landscape change in arid and semi-arid regions.   
Using advances in OSL techniques, new approaches in amalgamating  
surface sediment samples, and modelling depth profiles of cosmogenic  
nuclide concentrations, we are now able to quantify processes of  
landscape evolution - sediment generation, transport, and storage in  
arid and semi-arid environments over timescales from 1 ka to 1 Ma  
integrated over areas ranging from 1 to 104 km2.  The use of OSL  
dating and cosmogenic nuclide ‘tracing ‘ of sediment  across various  
features starting from source  regions on mountain peaks and exposed  
bedrock, through  transport  and recycling within river-valley  
systems, to distribution and deposition on piedmont  surfaces,  
terraces and alluvial fans has demonstrated that the diverse history  
of individual grains can be integrated to provide a coherent  
understanding of process and process rates. Using these tools,  
existing paradigms of surface modification can now be tested  
quantitatively.

In this session, we invite submissions which demonstrate the  
application of these techniques to regional studies in semi-arid  
systems, including regolith, dune fields, fluvial deposition, river  
incision and piedmonts. Comparisons of denudation and sediment  
generation rates between different regions and implications for  
climate and/or tectonic forcing are most welcome.



Paul Bierman                      [log in to unmask]
UVM Geology Dept.           Delehanty Hall
180 Colchester Avenue    Burlington, VT 05405
802-656-4411( v)               802-656-0045 (fax)

uvm.edu/~pbierman
uvm.edu/perkins/landscape
uvm.edu/cosmolab
uvm.edu/irwe





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