Mineral distribution within polymineralic veins in the Sanbagawa belt, Japan: Implications for mass transfer during vein formation

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22 Citations (Scopus)

Abstract

Pelitic schists of the Sanbagawa metamorphic belt contain several types of polymineralic veins that formed during the late stages of exhumation. The vein mineral assemblages are quartz + albite + K-feldspar + chlorite ± calcite (Type I, II) and quartz + albite + calcite (Type III). Type I and II veins contain quartz and albite with stretched-crystal and elongate-blocky textures, respectively. The mineral species within Type I veins vary with compositional bands within the host rocks. Type III veins are characterized by euhedral to subhedral quartz grains with concentric zoning and a homogeneous distribution along the vein length. The vein textures vary depending on the crack aperture during multiple crack-seal events: <0.08 mm for Type I, and 0.5-10 mm for Type III. Type II veins show intermediate features between Type I and III veins in terms of mineral distribution (weak dependence on the host rock composition) and apparent crack aperture (less than 1-15 mm). These observations suggest a transition in the dominant transport mechanism of vein components with increasing crack aperture, from diffusion from host rocks to fluid advection along cracks.

Original languageEnglish
Pages (from-to)323-336
Number of pages14
JournalContributions to Mineralogy and Petrology
Volume156
Issue number3
DOIs
Publication statusPublished - 2008 Sep 1

Keywords

  • Mass transfer
  • Mineral distribution
  • Polymineralic vein
  • Sanbagawa metamorphic belt
  • Vein texture

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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