MINERALOGICAL CONTRAINTS TO THE FORMATION OF VEIN-TYPE ZEOLITES FROM KIZARI AREA, THRACE NORTHERN GREECE
Fiche du document
1 janvier 2010
- handle: 10670/1.aq86a3
Ce document est lié à :
https://ejournals.epublishing.ekt.gr/index.php/geo [...]
Copyright (c) 2017 P. Voudouris, A. Magganas, M. Kati, N. Gerogianni, G. Kastanioti, G. Sakelaris , https://creativecommons.org/licenses/by-nc/4.0
Sujets proches
Results of analysis Analysis results Rocks, Volcanic Volcanic rocks Tephra Tuff Pyroclastics Volcanic ejecta Sodium chloride Table salt Halite Brine Nurture and nature Nature versus nurture Genetics and environment Nature--Nurture Environment Heredity and environment Magnetic iron ore Grains Cereal grains Cereals Breadstuffs Proof Environment Ecological science Environmental biology Bionomics Ecological sciences Environment Balance of nature Oecology Biology--Ecology Ecological processes Cawk Baryte Barytes Heavy spar EnvironmentCiter ce document
P. Voudouris et al., « MINERALOGICAL CONTRAINTS TO THE FORMATION OF VEIN-TYPE ZEOLITES FROM KIZARI AREA, THRACE NORTHERN GREECE », eJournals, ID : 10670/1.aq86a3
Métriques
Partage / Export
Résumé
Vein-type zeolites in Kizari area, (western Thrace) are found within fresh to zeolitic altered volcanic rocks of andesitic to dacitic composition. The zeolites stilbite-Ca, Sr-bearing heulandite-Ca and laumontite occur in epithermal-style crustiform quartz/chalcedony-calcite veins crosscuting lavas and volcanic breccias. Open-space filling is common and well-shaped crystals (up to 3cm) were observed. Smectite, feldspar, magnetite, pyrite and rutile occur in minor amounts in the veins. Halite and barite grains are included in stilbite-Ca. SEM EDS data indicate high Sr (up to 4.4 wt. % SrO) and Ba (up to 2.9 wt. % BaO) contents for heulandite-Ca. It is suggested that the studied zeolites are intergral parts of the porphyry-epithermal mineralizing systems which operated in the area during the Oligocene. Their formation took place in the outmost transitional propylitic to fresh zones of the porphyry-epithermal systems and in a submarine environment as indicated by the geological and mineralogical evidence.