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Paper Information

Journal:   IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY   FALL 2005- WINTER 2006 , Volume 13 , Number 2; Page(s) 287 To 302.
 
Paper: 

TEXTURAL AND MINERALOGICAL EVIDENCES OF MAGMA MIXING IN THE TRACHYANDESITIC LAVA FLOWS IN THE AB-E-TORSH DISTRICT, WESTERN QAZVIN, IRAN

 
 
Author(s):  ASIABANHA A.*, KANANIAN A.
 
* Geology Dept. Faculty of Science, Imam Khomeini Int. University
 
Abstract: 

Trachyandesitic rocks in the Ab-e-Torsh region, western Qazvin, have considerable thickness and extensive outcrops (>200 Km2) that form parts of the Alborz Paleogene volcanic belt. These rocks that can be correlated with the upper member of the Karaj formation, are subaerial eruptions with lava flows and some lava domes. Geochemically, these are classified as shoshonitic .series. Occurrence of some textural evidences (e.g., reaction rims, sieve textures and oscillatory zoning in feldspars and augites phenocrysts) and coexistence of inequilibrium plagioclase phonocrysts (An5-20, An36-61, An77-93), as well as compositional differences between phenocrysts and their surrounded mesostasis, all suggest that the magmatic evolutionary processes could have been occurred in an open system. On the other hand, existence of some alterations such as opacitization in phlogopitic biotites and paragasitic hornblends might be related to the late stages of the magmatic evolution with high 102 and PH20.Considering textural and mineralogical observations, as well as dispersion of the whole rock geochemical data, one may conclude that the magmatic evolution have been occurred by periodic refreshment of alkaline and basic magma by a more acidic intrusion.

 
Keyword(s): TRACHYANDESITE, ALBORZ ZONE, PALEOGENE BELT, SIEVE TEXTURE, OSCILLATORY ZONING, MAGMA MIXING
 
References: 
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