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Paper Information

Journal:   AMIRKABIR   Winter 2004 , Volume 15 , Number 57-D; Page(s) 158 To 175.
 
Paper: 

ANJERD SKARN GEOCHEMISTRY AND ITS ASSOCIATION WITH ECONOMIC COPPER MINERALIZATION, AZARBAIJAN-IRAN

 
 
Author(s):  HEZARKHANI A.*
 
* Department of Mining, Metallurgy and Petrolum Engineering, Amirkabir University
 
Abstract: 

relationships, two stages of hydrothermal alteration and related mineralization within the Anjerd skarn have been identified Thefirst stage (stage I) was produced by the early pulses of Fe-rich magmatically derived fluids, which caused the formation of oscillatory zoned garnets, followed by pyroxene (diopside and hedenbergite) + wollastonite and magnetite at high temperatures (~ 445 °C). The second stage (II) occurred at lower temperature (~ 360 °C) when the system collapsed, and is characterised by lower the temperature minerals like tremolite-actinolite, epidote, quartz, calcite, apatite, titanite, hematite crystallization and copper deposition. It is concluded that the Cu mineralization was due to decreasing and increasing the fo2 and pH respectively, in lower the temperature (< 400 °C) in the last stage of alteration in the Anjerd skarn.
A detailed mineralogical study presents that the fluctuations in the At+3/Fe+3 ratio at Anjerd skarns, caused a complex oscillatory zoning from andradite100 to andradite76 grossular24 in the index garnets. Individual zones are typically composed either of near end-member andradite or andradite containing approximately 20 mole % grossular. Introduction of fresh batches of Fe-rich fluid caused crystallization of near end-member andradite garnet since the system was buffered by fluid. TIle source of Al in the system was from Cretaceous marls and limestone sequences, since the Al content available from the magmatic solutions is very low and almost constant. Changes in thermodynamic parameters like fo2 . pH and T witlun the second stage of skarn alteration in Anjerd, caused an economic copper deposition.

 
Keyword(s): GEOCHEMISTRY, ANJERD, SKARN, ECONOMIC COPPER, IRAN
 
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