Mineral growth within fluid-filled cracks: Example of polymineralic Veins from the Sanbagawa metamorphic belt, Japan

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Sealed cracks in high-pressure metamorphic rocks are a direct evidence of fluid-filled cracks in subduction zones, but their implication to material transport remains unclear. The pelitic schists of the Sanbagawa metamorphic belt contain two types of veins at the exhumation stage, composed of quartz + albite + K-feldspar + chlorite (type I) and quartz + albite + calcite (type II). Type I veins contain elongate quartz and albite grains growing from vein walls, and show the mineral distribution related to compositional bands of host rocks. Type II veins are characterized by euhedral quartz grains with concentric zoning and by homogeneous mineral distribution along vein length. The microstructural variation of veins depends on the crack aperture of multiple crack-seal event; < 0.05 mm for type I and 0.5 - 3.0 mm for type II. These observations suggest a transition of the dominant transport mechanism of vein components with increasing crack aperture from diffusion from host rocks to fluid advection.

Original languageEnglish
Title of host publicationWATER DYANMICS
Subtitle of host publication4th International Workshop on Water Dynamics
Pages8-11
Number of pages4
DOIs
Publication statusPublished - 2007 May 11
Event4th International Workshop on Water Dynamics - Sendai, Japan
Duration: 2006 Nov 72006 Nov 8

Publication series

NameAIP Conference Proceedings
Volume898
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

Other4th International Workshop on Water Dynamics
CountryJapan
CitySendai
Period06/11/706/11/8

Keywords

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

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Ecology
  • Plant Science
  • Physics and Astronomy(all)
  • Nature and Landscape Conservation

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