Effect of lithology on calcite-vein formation in the Sanbagawa metamorphic rocks

K. Morohashi, A. Okamoto, N. Tsuchiya

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


Sealed cracks (mineral veins) in high-pressure metamorphic rock provide information on fluid flow within the subduction zone. In this study, we investigate the occurrence, mineralogy and textures of calcite-bearing veins from the Sanbagawa metamorphic belt, in the Nagatoro area, Kanto mountains, Japan. The population of calcite-bearing veins and the modal abundance of calcite within the veins indicate that calcite was preferentially precipitated within cracks within basic shcists rather than pelitic schists. Around the calcite-bearing veins, there are selvage zones of chlorite replacing actinolite+epidote layers within the host basic rocks. Such texture and the mass balance relationship suggest that calcite-bearing veins formed by the interaction between external CO2 fluids and Ca2+ dissolved from the host rock minerals such as epidote and actinolite.

Original languageEnglish
Title of host publicationWater Dynamics - 5th International Workshop on Water Dynamics
Number of pages4
Publication statusPublished - 2008
Event5th International Workshop on Water Dynamics - Sendai, Japan
Duration: 2007 Sept 252007 Sept 27

Publication series

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


Conference5th International Workshop on Water Dynamics


  • Basalt
  • Calcite
  • Sanbagawa metamorphic belt
  • Vein


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