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Geology spans the minute and gigantic, from skeletonized leaves in China to water on mars
Date:4/3/2014

heir results demonstrate that melting of enriched domains within the African-Arabian lithospheric mantle is a viable mechanism for producing the HIMU-like magmas observed in the region. Rooney and colleagues show that these enriched HIMU-like lithospheric domains are isotopically distinct from the Afar plume and are instead the result of long-term evolution of amphibole-bearing metasomes associated with the Neo-Proterozoic construction of the regional lithospheric mantle. Their data shows, for the first time, that lithosphere-derived HIMU-like magmas may be distinguished from "C"-like Afar plume magmas, constraining the source of reservoirs that contribute to rifting. This is an important new result, not only because it gives new insight into the processes of melt generation within the lithosphere regionally, but also because it explains the geographically and temporally widespread distribution of HIMU-like magmatism found on the African-Arabian plates by melting of an easily-fusible component associated with the initial formation of the lithosphere.


Early Cenozoic uplift of the Puna Plateau, Central Andes, based on stable isotope paleoaltimetry of hydrated volcanic glass
Robin R. Canavan et al., Department of Geology and Geophysics, Yale University, New Haven, Connecticut 06511, USA. Published online 31 Mar. 2014; http://dx.doi.org/10.1130/G35239.1.

The Central Andean Plateau is one of the largest mountain plateaus on Earth, second only to the Tibetan Plateau. Unlike Tibet, the Central Andean Plateau is not the result of two continental plates colliding and thus the processes by which the Central Andean Plateau achieved its high elevation remains an area of debate. To date, most study has focused on the northern portion of the Central Andean Plateau, the Altiplano of Bolivia. Isotope ratios that reflect the temperature and water composition during the form
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert  

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Geology spans the minute and gigantic, from skeletonized leaves in China to water on mars
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