[1] We report some of the first noble gas data for in situ lower oceanic crust and shallow mantle. From a suite of gabbros and peridotites recovered from the Atlantis Bank oceanic core complex on the Southwest Indian Ridge, we measured He, Ne, Ar, Kr and Xe concentrations as well as He/He and Ar/Ar ratios, there by documenting the noble gas content and signature of oceanic lithosphere. Except f...

Mantle convection stirs and homogenizes the subducted oceanic lithosphere with the convecting mantle. Convective mixing stretches and thins the subducted oceanic crust from an original thickness of 6 km to a thickness of 2 cm or less. The thinned, subducted oceanic crust can be observed as pyroxenite bands in high-temperature peridotite massifs. On the scale of centimeters, the bands are destro...

Abstract Extreme precipitation events are challenging to local and regional stakeholders across the United States. The Missouri River Basin (MoRB), covering an area over 1.29 million km 2 , is prone extreme events. These exacerbated by complex terrain in west numerous weather climate features which impact region on a seasonal/annual basis (low-level jets, mesoscale convective systems, cold air ...

Evidence from abyssal peridotites suggests that significant chemical reaction with peridotite can occur during the early stages of cooling and crystallization of mid-ocean ridge basalt (MORB) magmas. We evaluate the hypothesis that reactive crystallization (crystallization influenced by such melt^rock reaction) could cause magma compositions to evolve along a different chemical trajectory than ...

[1] Abstract: We studied trace element geochemistry and petrology of the crust-mantle transition zone (MTZ) in the Samail massif of the Oman ophiolite to constrain the location where different primitive magmas mix beneath an oceanic spreading ridge. The MTZ is the deepest location where crystallization took place and thus is an ideal place to determine the compositional diversity of melts leavi...

Basalts from the East Pacific Rise (EPR), Siqueiros transform zone and Mid-Atlantic Ridge (MAR) area have been analyzed for platinum-group elements (PGE) a wide range of incompatible elements. The low PGE content most primitive mid-ocean ridge basalts (MORB) suggests that they leave mantle sulfide-saturated but become sulfide under-saturated, as consequence decompression, during their ascent to...

www.thelancet.com Vol 383 May 17, 2014 1697 10 WHO. IHR Emergency Committee concerning Middle East respiratory syndrome coronavirus (MERS-CoV). July 9, 2013. http://www.who.int/ihr/ ihr_ec_2013/en/ (accessed May 6, 2014). 11 Independent Monitoring Board of the Global Polio Eradication Initiative. Sixth Report. London: Independent Monitoring Board, November, 2012. 12 WHO. International travel an...

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