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Geology covers multiple disciplines and substantial territory in April's new postings
Date:4/18/2013

placed at over 1200 degrees C, and cooled to 600 degrees C very slowly. Heat was lost mainly through the roof and less through the floor of the intrusion, so the upper rocks cooled below 600 degrees C before the lower and middle parts. Hence, the order of preservation of magnetic polarity is not from the bottom up as in volcanic rocks, but from the top (and slightly later from the bottom) inward toward the middle. Four magnetic reversals are inferred to have occurred during a period of 500,000 years in this intrusion.


Continental delamination and mantle dynamics drive topography, extension and fluid discharge in the Apennines
Claudio Chiarabba and Giovanni Chiodini, Istituto Nazionale di Geofisica Vulcanologia, Sezione CNT, Rome 00143, Italy. Published online ahead of print on 16 April; http://dx.doi.org/10.1130/G33992.1.

In this study, Claudio Chiarabba and Giovanni Chiodini show that the evolution of the Apennines mountain belt is sustained by a low velocity anomaly in the upper mantle associated with sub-lithospheric mantle replacement after removal of rigid continental lithosphere. This process is accompanied by the discharge of deep fluids that favor the generation of large normal faulting earthquakes, like the 2009 L'Aquila event. Chiarabba and Chiodini propose that this process named "delamination" is responsible for the past million years of lithospheric evolution in the area.


Reach-scale river dynamics moderate the impact of rapid Holocene climate change on floodwater farming in the desert Nile
Mark G. Macklin et al., Institute of Geography and Earth Sciences, Aberystwyth University, Aberystwyth SY23 3DB, UK; and School of Environment and Development, University of Manchester, Manchester M13 9PL, UK. Published online ahead of print on 16 April; http://dx.doi
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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