A Quantitative Link Between Recycling and Osmium Isotopes
Alexander V. Sobolev,1,2*
Albrecht W. Hofmann,2
Gerhard Brügmann,2,3
Valentina G. Batanova,1
Dmitry V. Kuzmin2,4
Recycled subducted ocean crust has been traced by elevated 187Os/188Os
in some studies and by high nickel and low manganese contents
in others. Here, we show that these tracers are linked for Quaternary
lavas of Iceland, strengthening the recycling model. An estimate
of the osmium isotopic composition of both the recycled crust
and the mantle peridotite implies that Icelandic Quaternary
lavas are derived in part from an ancient crustal component
with model ages between 1.1
x 10
9 and 1.8
x 10
9 years and from
a peridotitic end-member close to present-day oceanic mantle.
2 Max Planck Institute for Chemistry, Post Office Box 3060, 55020 Mainz, Germany.
3 Institut für Geowissenschaften, Johannes Gutenberg-Universität Mainz, Becherweg 21, 55099 Mainz, Germany.
4 V. S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of Russian Academy of Sciences, Koptuyga prospect 3, 630090, Novosibirsk, Russia.
* To whom correspondence should be addressed. E-mail: sobolev{at}geokhi.ru
