The behavior of C, H, and S in the solid Earth depends on their oxidation states, which are related to oxygen fugacity (fO2). Volcanic degassing is a source of these elements to Earth's surface; therefore, variations in mantle fO2 may influence the fO2 at Earth's surface. However, degassing can impact magmatic fO2 before or during eruption, potentially obscuring relationships between the fO2 of...

Submarine volcanism represents ~80% of the volcanic activity on Earth and is an important source of mantle-derived gases. These gases are of basic importance for the comprehension of mantle characteristics in areas where subaerial volcanism is missing or strongly modified by the presence of crustal/atmospheric components. Though, the study of submarine volcanism remains a challenge due to their...

The mantle plume underlying the Hawaiian Swell has been modelled numerically using a stationary steady axisymmetric plume under a solid conducting lid. A method of calculating the rate of melt production from the plume has been developed, and the total melt production rate, the residual depth anomaly and the geoid anomaly have been used to constrain the model. The plume has a central potential ...

1 Yahoo! Yahoo! First quarter 2003 financial highlights. Sunnyvale, CA: Yahoo!, 2003. 2 Bannan KJ. Search engines’ positive results drive price wars. B to B 2003;88(10 Mar):18-20. 3 Krishnamurthy S. Deciphering the internet advertising puzzle.Marketing Management 2000;9:34-9. 4 Centers for Disease Control and Prevention. Donated television airplay of colorectal cancer education public service a...

Outgassing of helium and argon and the isotope ratio distribution of helium isotopes in basalts are some of the most important geochemical constraints on mantle structure and evolution, but their interpretation in terms of mantle processes is ambiguous and controversial. Here, the evolution of these isotopes and their radiogenic parent isotopes of U, Th and K are studied using a numerical model...

This study presents the first geochemical, mineralogical and petrological data on mafic ultramafic rocks of Texenna (Lesser Kabylia, north-eastern Algeria) with aim constraining their tectonic setting in context Maghrebide belt. The magmatic-sedimentary complex comprises serpentinite, metabasites (metagabbro, metadolerite metabasalt pillow-lava structures), oceanic metasediments (radiolarite ca...

The transfer (accretion) of materials from a subducting oceanic plate to a subduction-accretionary complex has produced rock assemblages recording the history of the subducted oceanic plate from formation to arrival at the trench. These rock assemblages, comprising oceanic igneous rocks progressively overlain by pelagic sedimentary rocks (chert and/or limestone) and trench-fill clastic sediment...