Variations in stable isotope compositions (δ13C, δ18O) of calcite within exhumation-related veins from the Sanbagawa metamorphic belt

Keisuke Morohashi, Atsushi Okamoto, M. Satish-Kumar, Noriyoshi Tsuchiya

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Stable isotope compositions (δ13C, δ 18O) of calcite within the veins hosted by the Sanbagawa metamorphic rocks in the Nagatoro area, Kanto mountains, Japan gave clues on movement of fluids during exhumation. The host rock calcite shows the nearly uniform δ18O values ranging from +14.5 to +16.5‰ (V-SMOW), and wide δ13C variation from -12.1 to +1.3‰ (V-PDB). The δ13C values of calcite within the exhumation--related veins also have wide variation, and the Δhost-vein (= δ 13Chost rock13Cvein) value vary depending on vein thickness and textures. Thin stretched crystal veins contain calcite with δ13C value close to that of the host rock calcite (Δhost-vein < ±2‰). In contrast, calcite grains within the thick blocky veins have homogenous δ 13C values with large variations with host rock (Δhost-vein = +3.5 - -3.0‰). The latter types of sealed cracks may have played as dominant pathways of regional fluid flow.

Original languageEnglish
Pages (from-to)361-364
Number of pages4
JournalJournal of Mineralogical and Petrological Sciences
Volume103
Issue number5
DOIs
Publication statusPublished - 2008

Keywords

  • Calcite veins
  • Carbon and oxygen stable isotopes
  • Fluidflow
  • Sanbagawa metamorphic belt

ASJC Scopus subject areas

  • Geophysics
  • Geology

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