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AGU Journal Highlights -- March 19, 2008
Date:3/19/2008

oblem is sparse, but Stamps et al. find that geological data covering the past 3.2 million years along the SWIR are consistent with current geodetic data in east Africa. They invert the two data sets jointly to obtain the first complete kinematic model for the EAR. They show that the data are consistent with the existence of three subplates embedded within the rift, as previously suggested from earthquakes but left unquantified, illustrating the initial process by which a continent breaks apart.

Title: A kinematic model for the East African Rift

Authors: D. Sarah Stamps and Eric Calais: Department of Earth and Atmospheric Sciences, Purdue University, West Lafayette, Indiana, U.S.A.;

Elifuraha Saria: University College for Lands and Architectural Studies, University of Dar Es Salaam, Dar Es Salaam, Tanzania;

Chris Hartnady: Umvoto Africa Ltd., Cape Town, South Africa;

Jean-Mathieu Mocquet: CNRS Gosciences Azur, Valbonne, France;

Cynthia J. Ebinger: Department of Geology and Geophysics, University of Rochester, Rochester, New York, U.S.A.;

Rui M. Fernandes: CGUL, IDL, UBI, Covilha, Portugal

Source: Geophysical Research Letters (GRL) paper 10.1029/2007GL032781, 2008; http://dx.doi.org/10.1029/2007GL032781

11. Corals skeletons record nutrient changes

Physical and biogeochemical processes linked to climate variations control the concentration of nutrients within the low-latitude ocean. However, methods for reconstructing past nutrient concentrations in the surface ocean are few and indirect. LaVigne et al. hypothesize that massive coral skeletons, which grow in continuous annual bands, preserve a record of seawater nutrient concentrations present when the organism laid down each band. Noting that phosphorus is often a limiting nutrient in the ocean, the authors analyze a four-year record from a coral sample coll
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Contact: Peter Weiss
pweiss@agu.org
202-777-7507
American Geophysical Union
Source:Eurekalert

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