0000000001108284

AUTHOR

Colin W. Devey

showing 2 related works from this author

Understanding melt generation beneath the slow-spreading Kolbeinsey Ridge using 238U, 230Th, and 231Pa excesses

2011

International audience; To examine the petrogenesis and sources of basalts from the Kolbeinsey Ridge, one of the shallowest locations along the global ridge system, we present new measurements of Nd, Sr, Hf, and Pb isotopes and U-series disequilibria on 32 axial basalts. Young Kolbeinsey basalts (full-spreading rate = 1.8 cm/yr; 67 degrees 05'-70 degrees 26'N) display ((230)Th/(238)U) 1 with ((230)Th/(238)U) from 0.95 to 1.30 and have low U (11.3-65.6 ppb) and Th (33.0 ppb-2.40 ppm) concentrations. Except for characteristic isotopic enrichment near the Jan Mayen region, the otherwise depleted Kolbeinsey basalts (e. g. (87)Sr/(86)Sr = 0.70272-0.70301, epsilon(Nd) = 8.4-10.5, epsilon(Hf) = 15…

NORWEGIAN-GREENLAND SEAU-SERIES DISEQUILIBRIA010504 meteorology & atmospheric sciences[SDE.MCG]Environmental Sciences/Global ChangesMID-ATLANTIC RIDGEGeochemistry[SDU.STU]Sciences of the Universe [physics]/Earth SciencesHETEROGENEOUS ICELAND PLUMEMid-Atlantic Ridge010502 geochemistry & geophysics01 natural sciences[SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/GeochemistryGeochemistry and PetrologyJUAN-DE-FUCAComputingMilieux_MISCELLANEOUSTH-PA-RA0105 earth and related environmental sciencesPetrogenesisND-PB ISOTOPEPeridotiteBasaltUPWELLING RATES BENEATH[ SDU.STU ] Sciences of the Universe [physics]/Earth SciencesCrustTRACE-ELEMENT EVIDENCE[ SDU.STU.GC ] Sciences of the Universe [physics]/Earth Sciences/GeochemistryEAST PACIFIC RISE[ SDE.MCG ] Environmental Sciences/Global Changes13. Climate actionRidge (meteorology)UpwellingEclogiteGeologyGeochimica et Cosmochimica Acta
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The Foundation Seamount Chain: A first survey and sampling

1997

The Foundation Seamounts form a 1400 km-long chain on the Pacific plate from 32 °S, 127 °W to the Pacific-Antarctic spreading axis at 38 °S, 111 °W. Previously only known from sparse single-beam echosoundings and satellite altimetry, we present here the first multibeam bathymetric survey and geological sampling results. We confirm that the submarine topography correlates with the altimetry, and that the chain is volcanic rather than tectonic or microcontinental in origin. The chain can be divided up morphologically and geochemically into three section: (1) west of 125 °W large flat-topped volcanoes composed of incompatible-element depleted lavas ( ≈ 1) of a near-ridge origin with little or …

geographyIncompatible elementgeography.geographical_feature_categoryPacific PlateSeamountGeologyOceanographyPlumePaleontologyTectonicsVolcanoGeochemistry and PetrologyRidgeHotspot (geology)SeismologyGeology
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