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Paper Information

Journal:   GEOSCIENCES   SUMMER 2008 , Volume 17 , Number 68; Page(s) 140 To 149.
 
Paper: 

SOURCE AND TECTONIC SETTING OF ZARJEBOSTAN (NE OF QAZVIN) PALEOGENE VOLCANIC ROCKS USING REE AND HFSE ELEMENTS

 
 
Author(s):  KALANTARI KIMIA, KANANIAN A., ASIABANHA A., ELIASI M.
 
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Abstract: 

Paleogene basic to intermediate lava flows of Central Alborz, in the northeast of Qazvin city (Zarjebostan), include trachy-andesite, basaltic trachy-andesite and basaltic andesite. These volcanic rocks are high-K calc-alkaline rocks. Based on the high LILE/HFSE and LREE/HREE ratios and their similar composition to subduction volcanic rock suites; it seems that they have formed in a subduction zone. The subduction process has little effect on the concentration of Zr, Ta, Hf, Sm, Tb, Nd, Eu and Y elements, while it has strong influence on concentration of Th, U and La elements. Due to high Ba/La, Ba/Ta and La/Ta ratios and low TiO2 content of lavas, they could be attributed to magmatic arc setting. Th/Yb vs. Ta/Yb diagrams and association of study suite with extensive volume of acidic tuffs, indicate that these rocks have been formed in an active continental margin.

 
Keyword(s): ANDESITE, SUBDUCTION, ACTIVE CONTINENTAL MARGIN, ALBORZ
 
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