Uranium-series age constraints on lavas from the axial valley of the Mid-Atlantic Ridge, MARK area

Marnie E. Sturm, Steven J. Goldstein, Emily M. Klein, Jeffrey A. Karson, Michael T. Murrell

Research output: Contribution to journalArticle

34 Scopus citations

Abstract

Mass spectrometric measurements of 230Th-226Ra, 235U-231Pa and 238U-230Th disequilibria are used to determine eruption ages for four mid-ocean ridge basalts from the median valley of the Mid-Atlantic Ridge south of the Kane Fracture Zone (MARK area). Three samples were collected across-axis on the Axial Volcanic Ridge (i.e. the Neovolcanic Ridge) near the Snake Pit hydrothermal mound, and one sample was collected near the crest of Serocki Volcano ~ 50 km south of Snake Pit. (226Ra)/(230Th) and (230Th)/(238U) activity ratios are low and uniform for all four samples, while (231Pa)/(235U) activity ratios are elevated and somewhat more variable. Age constraints suggest that these lavas, from the most robust volcanic edifices in the MARK area, are 10 000-20 000 yr old. The age data are used to evaluate the efficacy of commonly used age estimate scales based on qualitative indicators (e.g. sediment cover, glass quality) and to begin to quantify the temporal and spatial dependence of volcanic, tectonic and hydrothermal processes at slow-spreading oceanic ridges. (C) 2000 Elsevier Science B.V. All rights reserved.

Original languageEnglish (US)
Pages (from-to)61-70
Number of pages10
JournalEarth and Planetary Science Letters
Volume181
Issue number1-2
DOIs
StatePublished - Oct 17 2000
Externally publishedYes

Keywords

  • Lava flows
  • Mid-Atlantic Ridge
  • Mid-ocean ridge basalts
  • Uranium disequilibrium

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

Fingerprint Dive into the research topics of 'Uranium-series age constraints on lavas from the axial valley of the Mid-Atlantic Ridge, MARK area'. Together they form a unique fingerprint.

  • Cite this