Constraints on transport and kinetics in hydrothermal systems from zoned garnet crystals

Bjørn Jamtveit, Richard Hervig

Research output: Contribution to journalArticle

89 Scopus citations

Abstract

Zonation of oxygen isotope ratios, fluorine, and rare earth element abundances across garnet crystals from the Permian Oslo Rift reflect temporal variation of the hydrothermal system in which the garnets grew. A sharp rimward decrease in the 18O/16O ratio (of 5 per mil) across the interface between aluminum-rich garnet cores and iron-rich rims indicates influx of meteoric fluids to a system initially dominated by magmatic fluids. This influx may record the transition from ductile to brittle deformation of the hydrothermally altered rocks. In contrast, fluorine and light rare earth element concentrations increase at the core-rim interface. These data may reflect enhanced advective transport and notable kinetic control on trace element uptake by the garnets during brittle deformation.

Original languageEnglish (US)
Pages (from-to)505-508
Number of pages4
JournalScience
Volume263
Issue number5146
DOIs
StatePublished - Jan 1 1994

ASJC Scopus subject areas

  • General

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