Velocity of vertical fluid ascent within vein-forming fractures

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

Quartz-albite-calcite veins in metamorphic rocks of the Sanbagawa belt, Japan, contain sugary mosaics of equant quartz grains <0.01-1.6 mm in size (blocky texture). The quartz crystals show euhedral to subhedral double-terminated crystal shape, and concentric growth zoning, indicating suspension in aqueous fluid during crystal growth until formation of a framework within the crack. Such a crystallization process is only possible when downward crystal settling is balanced by upward fluid flow. Application of crystal settling theory to the crystal size distributions within the veins reveals an extremely high rate of fluid ascent during blocky vein formation (10-2 to 10-1 m/s) due to the low viscosity of the hydrothermal fluid (∼10-4 Pa·s). Such a high rate of ascent suggests the injection of fluids from mobile hydrofractures within deeper levels of the subduction zone.

Original languageEnglish
Pages (from-to)563-566
Number of pages4
JournalGeology
Volume37
Issue number6
DOIs
Publication statusPublished - 2009 Sep 8

ASJC Scopus subject areas

  • Geology

Fingerprint Dive into the research topics of 'Velocity of vertical fluid ascent within vein-forming fractures'. Together they form a unique fingerprint.

Cite this