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• W1501156718 abstract "Volcanic accretion at the fast-spreading EastPacific Rise (EPR) occurs over a ~2-4 km wide neo-volcanic zone oneither side of the axial summit trough (AST). Eruption ages arecritical for understanding the distribution and timing of volcanicand magmatic activity. Uranium series nuclides are susceptible tofractionation by magmatic processes that occur beneath mid-oceanridges, and the half-lives of 22 6Ra (1.6 kyrs) and 23Th (75 kyrs)make them ideally suited for determining eruption ages and placingconstraints on eruption frequency and temporal changes in magmachemistry. Accordingly, major and trace element, and long-livedradiogenic and 8 U-2 Th-226Ra isotope compositions were measuredin basalts from 9'-10 N EPR to determine eruption ages and to placetemporal constraints on volcanic and magmatic processes. At 9030'NEPR, 238U-2 Th-2 26Ra compositions indicate that trace elementallyand isotopically enriched mid-ocean ridge basalt (MORB) collectedoff-axis erupted >8 ka and that E-MORB magmatism is interspersedwith normal, depleted MORB magmatism. Lava ages are consistent witheruption from the AST and flow down the ridge flanks, which is incontrast to previous studies that suggested E-MORB erupted fromoff-axis vents. At 9'50'N EPR, discrete eruptive units aredistinguished by high precision 238U, 32 Th, and 226Ra sampleconcentrations, but because the resolution of the 2 Th-226Ra modelage dating technique is ~±1 kyrs, the surprisingly young ages ofthese lavas prohibit the construction of an explicit,time-constrained lava stratigraphy. Nonetheless, seven differentflows identified within 0.8-2.0 km west of the AST imply greaterfrequency of flows to these distances than previously recognized.Model age dating of ferrobasalts, basaltic andesites, andesites,and dacites sampled from the east limb of the overlapping spreadingcenter at 9'03'N EPR is difficult due to uncertainties in magmaresidence times. However, (22 6Ra/23 Th) disequilibria indicaterecent basaltic volcanism (<<8 ka) up to -4 km off-axis. Theaxial graben at the rise crest sources the most recent volcanicactivity and is the dominant location for eruption of high-silicamagmas. Major element, trace element, 87Sr/86Sr, and (3 4U/238U)isotope compositions are consistent with the formation of dacitemagmas by extensive crystallization, and 238U-2Fh-226 Rasystematics imply crustal residence times of -8kyrs." @default.
• W1501156718 created "2016-06-24" @default.
• W1501156718 creator A5068004091 @default.
• W1501156718 date "2010-01-01" @default.
• W1501156718 modified "2023-10-03" @default.
• W1501156718 title "Temporal and petrogenetic constraints on volcanic accretionary processes at 9-10 degrees north East Pacific Rise" @default.
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• W1501156718 doi "https://doi.org/10.1575/1912/3750" @default.
• W1501156718 hasPublicationYear "2010" @default.
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