Open AccessFerri-sepiolite in hydrothermal calcite-quartz-chalcedony veins on Nûgssuaq in West Greenland
Author(s) -
K Binzer,
Sven Karup-Møller
Publication year - 1974
Publication title -
bulletin
Language(s) - English
Resource type - Journals
eISSN - 2597-2936
pISSN - 0105-3507
DOI - 10.34194/bullggu.v114.6655
Subject(s) - sepiolite , calcite , chalcedony , quartz , geology , hydrothermal circulation , mineral , mineralogy , geochemistry , epidote , chemistry , materials science , paleontology , metallurgy , chlorite , raw material , organic chemistry
Ferri-sepiolite has been found in low temperature fracture veins in volcanic rocks. The veins are composed of an early calcite-quartz generation and a late generation of calcite, quartz, chalcedony and minor amounts of ferri-sepiolite. The late generation developed simultaneously with deformation of the early minerals. Fluid inclusion studies on the associated calcite give a temperature of formation of the early generation of 65°-80°C. Secondary inclusions in calcite which may have formed simultaneously with the late generation homogenize at temperatures between 40 and 50° C. The mineral veins probably formed from circulating meteoric waters. Optical and other physical properties of the ferri-sepiolite together with X-ray crystallographic and chemical data of the mineral are compared with the similar properties of ferri-sepiolite from East Greenland.