Online abstract submission for Goldschmidt 2009 at Davos is now open and
the deadline is 22nd February. We would like to make you aware of a
session within Theme 5 (Continental Crust Formation, Tectonics and
Session 5a: The Growth of Continental Crust: timing and rates Sam Bowring
(MIT) and Craig Storey (Bristol), Keynote: Stein Jacobsen (Harvard)
A long standing debate persists over the growth and preservation of
continental crust during Earth's evolution. One end –member is the
steady-state hypothesis which assumes that a volume of crust,
approximately equal to present day volume, was formed early in Earth
history and has subsequently been maintained by recycling and new
additions. Another end-member hypothesis suggests more gradual growth,
either smoothly or episodically over all of Earth history including
episodes of rapid growth related to mantle dynamics. New approaches and
discoveries are re-invigorating this debate and include extinct
radionuclides (e.g. 142Nd) and long-lived radiogenic isotope systems (e.g.
Sm-Nd and Lu-Hf) In this session we invite contributions that aim to
address this fundamental question through the integration of geology,
geochemistry, and isotopic methods.
We look forward to your abstracts and to a very lively session at Davos.
Please forward this message on to your colleagues who may be interested.
With Best Wishes for 2009
Sam Bowring and Craig Storey