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Seismic zones, river deltas, landslides, fossil reptiles, and more new Geology science
Date:3/6/2012

ern sand deposited along the coast of the eastern Mediterranean reflect the combined effect of exposure and burial during transport, the concentrations of these nuclides in buried sands are the result of decay of this initial dosing.

Hadean greenstones from the Nuvvuagittuq fold belt and the origin of the Earth's early continental crust
John Adam et al., GEMOC, Earth and Planetary Sciences, Macquarie University, NSW 2109, Australia. Posted online 2 Mar. 2012; doi: 10.1130/G32623.1.

The origin of Earth's earliest continental crust is a topic that has created much debate. In this study, John Adam of Macquarie University and colleagues perform high temperature and pressure melting experiments on potential continental crust source rocks from the 4.28 Ga Nuvvuagittuq Complex, Quebec. This fold belt contains the oldest known rocks discovered on the planet so far. Their results show that the chemical characteristics of the experimental melts are like early continental crust. This suggests that they may have been inherited from source rocks that were themselves the product of an earlier episode of crustal recycling. Adam and colleagues suggest that the processes are similar to modern plate tectonics.

Hydrothermal circulation and the dike-gabbro transition in the detachment mode of slow seafloor spreading
Andrew M. McCaig and Michelle Harris, Institute of Geophysics and Tectonics, School of Earth and Environment, University of Leeds, Leeds LS2 9JT, UK. Posted online 2 Mar. 2012; doi: 10.1130/G32789.1.

According to Andrew M. McCaig and Michelle Harris of the University of Leeds, rates of seafloor spreading in the Pacific Ocean are fast (~10 cm/yr), such that the ocean crust has an extremely consistent layered structure. In particular, note McCaig and Harris, there is a transition from coarse grained, slowly cooled gabbros upward to fast-cooled sheeted dikes at about 1.5 km below the seaflo
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Contact: Christa Stratton
cstratton@geosociety.org
Geological Society of America
Source:Eurekalert

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