Writers : Usefzade,Mohammad Hossein;Sabzehei,Mosaieb
Refference : The 20th Symposium on Geoscience;Tehran
Publishing Year : 1380

Abstract :

The studied area in this research is located in sw Birjand (S Khorasan). The vast outcrop of listventites is the most interesting geological phenomena in this area . Ingeneral, Iistvenites has formed in alcali condition by cor enrichment hydrothermal solutions. During this reactions,primary paragenesis of minerals is changed to silisic-carbonate assemblages. This process generally occurred at locality in which there is chanals for transport of hudrothermal solution. Fault zone, bedding surfaces, rock unit bounddary arc the most important locality, that linear trend of listvenite shows it. From physicochernical aspect, this reactionhappened in conditions with PH about 10-12 by co2 enrichment solution (winkler). Form thermodynamic aspect. based on changes of T versus xco2 (in P constant), reactions containing CO2 and H2O divided in live groups in which listvenitation reacation is situated in carbonation- dehydration group and its carve have a negative slope meaning that with increasing of XCO2 the low temperature is required for reaction (greenwood 1976)

Subject List : Listwaenit