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Paper Information

Journal:   GEOCHEMISTRY   SPRING 2014 , Volume 3 , Number 1; Page(s) 427 To 439.
 
Paper: 

PETROGRAPHY, GEOCHEMISTRY AND TECTONIC ORIGIN OF SCORIA (VESICULARBASALT) IN POINT VOLCANOES OF KHORSAND AND KHATOONABAD (SHAHRE-BABAK-KERMAN)

 
 
Author(s):  MORADI SAKINEH*, MORADIAN AABBAS
 
* FACULTY OF SCIENCE, DEPARTMENT OF GEOLOGY, SHAHID BAHONAR UNIVERSITY OF KERMAN, KERMAN, IRAN
 
Abstract: 

The Quaternary volcanices in Khorsand and khatoonabad are located in Kerman province and in north-east and north-west of Shahre-Babak. These area are in south-western margin of central Iran and are between Nain-Baft ophiolite melange and Dehaj-Sardoieh (Dahaj-Sardoieh is part of Urumieh-Dokhtar magmatic series) Lithological units are vesicular basalt and variation bomb that based on microscopic studies are Olivin basalt and Pyroxene basalt. Their major minerals are Olivin (the three generations), pyroxene (the two generations) and plagioclase. Microlitic porphiritic vesicular is magor texture in these rocks. On the basis of geochemical analysis, magma that has formed the rocks had alkalin nature with a Na2O/K2O>1 ratio. The study of Rare earth element and trace elements patterns show that dip of variations have desending trend and indicate basaltic rocks inriched in LREE and LILE and depleted in HREE and HFSE. The study of Rare earth element patterns displays that magma orginated from an enriched asthenospheric mantle (garnet lherzolite). Based on La/Sm versus La plot the Khorsand and Khatoonabad basalts were formed by 6 to 8% partial melting of garnet lehrzolit parental rock. On the basis of solidification index (SI: 35 to 45%), these rocks arenot differentiation. The tectonic environment for the samples in discremenate diagrames is within continental plate setting. In Khorsand erea, the activity of Nain-Baft fault tensional tectonorigim and in Khtoonabad, lateral branches of Anar fault leading to thecreation of open fractures in crust which have conducted the flow of magma to the surface.

 
Keyword(s): SCORIA, OLIVIN BASALT, PYROXEN BASALT, ALKALIN, GARNET LERZOLIT SOURCE, CONTINENTAL WITHIN PLATE
 
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