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Showing 1 to 5 of 5 for “"Ocean Island Basalt"”.
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Characterisation of ocean island basalt sources : St. Helena
… Helena rock suite (SHRS) are formed in an intra-oceanic plate tectonic setting as part of two shield volcanoes. The SHRS vary from picrobasalts to phonofites. The former represent mantle derived melts, whereas the remainder of the suite have undergone differing degrees of crystal fractionation. A …
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The Evolution of the Galapagos Mantle Plume: From Large Igneous Province to Ocean Island Basalt
… Igneous Provinces (LIPs), vast outpourings of basaltic lava (~106 km3), while plume tail melting forms linear chains of ocean island basalts (OIBs) similar the Emperor-Hawaii Seamount chain. Mantle plume derived melts indicate that these structures sample deep Earth geochemical and lithological …
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The high temperature geochemistry of vanadium: From isotope ratios in ocean island basalt to thermal diffusion processes at the core-mantle boundary
… I measured the V isotopic composition of ocean island basalts (OIB) which potentially sample materials from the lower mantle rather than upper mantle as represented by mid-ocean ridge basalt (MORB). While there is some variability due to magmatic differentiation processes, the average δ51V …
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The volcanology and petrogenesis of the Northern Lunar Crater Volcanic Field, Nye County, Nevada
… to Recent cinder cones, maars and alkali basalt lava flows represents the northern terminus of the Death Valley-Pancake Range Basalt Zone. Basalts from this area can be divided into two distinct groups, those of trace element enrichment relative to Ocean Island Basalt, and those of trace …
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Mafic volcanism in the Colorado Plateau/Basin-and-Range Transition Zone, Hurricane, Utah
… and cinder (scoria) cones composed of vesicular basalt, bombs and agglutinate. Radiometric dating and geologic relationships demonstrate that the HVF formed over a period of at least 100,000 years. In the upper crust, magma probably rose along joints in sedimentary rocks because chains of …