Phosphatization of basaltic rocks from Sal Island, Cape Verde Archipelago: A microtopochemical approach using synchrotron radiation X-ray fluorescence

DCM Group Author, João Pedro Botelho Veiga, T. Pereira da Silva, M.O. Figueiredo, P. Chevallier

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The geochemical processes involved in phosphorous enrichment of volcanic rocks under shallow seawater are not yet fully understood. As a contribution to this problematic, a detailed chemical characterization of phosphatized basaltic hyaloclastites assigned at Sal Island, Cape Verde archipelago, was undertaken using synchrotron radiation X-ray fluorescence. The mineralogical constitution of the samples was characterized by combining X-ray diffraction and electron microprobe data. Micromappings of metallogenetically significant components and other mobile chemical species were obtained. A positive correlation between Br plus Sr, on one side, and As plus Cr and Zn, on the other, is pointed out and brief comments are presented on the selective up-take of chemical elements in close dependence from the mineral assemblage formed by phosphatization.
Original languageEnglish
Pages (from-to)399-402
JournalJournal De Physique Iv
Volume104
Issue numberNA
DOIs
Publication statusPublished - 1 Jan 2003
Event7th International Conference on X-Ray Microscopy - Grenoble, France
Duration: 28 Aug 2002 → …

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