Geochemistry of Late Cretaceous (60 - 67 Ma) igneous activities in the Hebrides Terrace seamount (guyot) area, Scotland

M. El-Tokhi, M. Omran, A. El-Muslem

Research output: Contribution to journalArticlepeer-review

Abstract

Tholeiitic basalts in various stages of alteration were dredged from Late Cretaceous volcanic rocks (60-67 Ma) in the Hebrides Terrace seamount area in the Atlantic Ocean. These rocks are extrusive olivine basalts, including high- and low-Al basalts. High-Al basalts are depleted in MgO, CaO, Cr, Sc, V, Sr, Zr and enriched in TiO2, Na2O, Nb, Rb as compared with low-Al basalts. Petrography and bulk-rock composition (major, trace and rare-earth elements) data defined clear tholeiitic suites displaying possible liquid lines of descent related to different degrees of crystal fractionation and partial melting. Isotopic dating of dredged samples gave the guyot an age of 60-67 Ma, in support of the assumption that it was formed during the Late Cretaceous.

Original languageEnglish
Pages (from-to)9-17
Number of pages9
JournalChinese Journal of Geochemistry
Volume24
Issue number1
DOIs
Publication statusPublished - 2005
Externally publishedYes

Keywords

  • Analysis
  • Rock and mineral
  • Silicate
  • Standard sample

ASJC Scopus subject areas

  • Geochemistry and Petrology

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