How large is the mantle source of ocean island basalts?
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14 results for "Ocean Islands"
14 results for "Ocean Islands"
A common parentage for Deccan Continental Flood Basalt and Central Indian Ocean Ridge Basalt? A geochemical and isotopic approach
Journal Article
A comparison of geochemical and Sr–Nd–Pb isotopic compositions for Deccan Continental Flood Basalts (CFBs) and Central Indian Ridge (CIR) Basalts is presented: these data permit assessment of possible parental linkages between the two regions, and...
Solid Earth Geochemical Cycles
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We are all familiar with cycles of water and oxygen through life, the ocean and the atmosphere. The solid Earth also cycles all the elements, from interior to exterior and back again, through volcanism, plate movements, weathering, sedimentation, and...
EPS 145/245 Introduction to Igneous Petrology and Petrogenesis
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How igneous rocks form and reveal the processes and fluxes involved in the circulation of the solid Earth. The course begins with the essential elements of igneous petrology, rock description and nomenclature, mineralogy, phase diagrams, processes of...
Vanadium isotope compositions of mid-ocean ridge lavas and altered oceanic crust
Journal Article
Vanadium isotope compositions of igneous rocks have the potential to constrain variations of physico-chemical conditions such as oxidation states during magmatism. Here, we present V isotope data for 27 fresh lavas (ranging from basaltic to dacitic...
The boron systematics of intraplate lavas: Implications for crust and mantle evolution
Journal Article
Ocean island basalts (OIBs) possess uniformly low B contents, and lower B/Nb and B/K2O ratios than mid-ocean ridge basalts (MORBs). As with Pb, B enrichments in both MORBs and OIBs are substantially lower than those of arc volcanics or continental rocks...
The systematics of lithium abundances in young volcanic rocks
Journal Article
Lithium is a moderately incompatible trace element in magmatic systems. High precision analyses for lithium conducted on well characterized suites of MORB and ocean island basalts suggest a bulk distribution coefficient of 0.25−0.35 and behavior which is...
The importance of parental magma composition to calc-alkaline and tholeiitic evolution: Evidence from Umnak Island in the Aleutians
Journal Article
Okmok and Recheshnoi are adjacent volcanoes on the island of Umnak in the Aleutian Arc. Ninety-five new chemical analyses of lavas from the two volcanoes show that Okmok exhibits a classical tholeiitic and Recheshnoi a calc-alkaline differentiation trend...
Distinguishing melt and fluid subduction components in Umnak Volcanics, Aleutian Arc
Journal Article
Plate processing at convergent margins plays a central role in the distribution of elements among major earth reservoirs. The mechanisms by which this distribution occurs, however, have remained poorly constrained. This paper provides new constraints...
Temporal control of subduction magmatism in the eastern Trans-Mexican Volcanic Belt: Mantle sources, slab contributions, and crustal contamination
Journal Article
The magmatic record of the easternmost part of the Trans-Mexican Volcanic Belt elucidates how temporal changes in subduction parameters influence convergent margin volcanism. In the Palma Sola massif, three phases of magmatic rocks with distinct chemical...
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An isotopically distinct Zealandia–Antarctic mantle domain in the Southern Ocean
Journal Article
Article | Published: 28 January 2019
An isotopically distinct Zealandia–Antarctic mantle domain in the Southern Ocean