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Paper Information

Journal:   PETROLOGY   WINTER 2012 , Volume 2 , Number 8; Page(s) 55 To 67.
 
Paper: 

GEOLOGY, GEOCHEMISTRY AND BEHAVIOR OF RARE EARTH ELEMENT IN THE HYDROTHERMAL ALTERATION ZONES, KARKAS MOUNTAIN NORTH OF ISFAHAN

 
 
Author(s):  MAKKI ZADEH MOHAMMAD ALI, TAGHIPOUR BATOUL*
 
* DEPARTMENT OF EARTH SCIENCES, FACULTY OF SCIENCES, UNIVERSITY OF SHIRAZ, SHIRAZ, IRAN
 
Abstract: 

The Eocene volcanic rocks in the south of Karkas region have been subjected to alteration by hydrothermal and the late magmatic fluids. These volcanics are acidic to intermediate in composition and they show calc-alkaline magmatic affinity. A regular distribution pattern is not observed in the alteration zones. The propyl tic zone forms the outermost part of the alteration facies. The propylitic and argillic have mostly a sharp boundary. The latter zone is characterized by kaolinite and veinlets of iron oxide (oxidized pyrite). The advance argillic zone, as dyke outcrop, occurs within argillic zone. It is also characterized by widespread alunite occurrences. On the base of EDS analysis and using K, Na, and Ca discrimination diagram, the acid-sulfate minerals are alunite to natroalunite in composition. The silicic zone is exposed the vicinity of advance argillic zone. The geochemical studies of rare earth elements in the studied altered zones indicate that silicic zone is depleted in REE, which may be deduced by high water/rock ratio and high activity of ion sulfate. The advance argillic zone displays LREE enriched and depletion in HREE which may be due to the presence of abundant alunite and the replacement of K by LREE in its structure. The REE-enrichment in argillic zone is notable. This can be related to the low acidity and immobility of these elements in this zone.

 
Keyword(s): KARKAS, HYDROTHERMAL ALTERATION, ARGILLIC, ADVANCED ARGILLIC, SILISIFICATION
 
References: 
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