Paper Information

Journal:   PETROLOGY   WINTER 2018 , Volume 8 , Number 32 #B0045; Page(s) 1 To 20.
 
Paper: 

USING WHOLE ROCK AND MINERAL CHEMISTRY FOR DETERMINING THE ORIGIN OF LAMPROPHYRES FROM DEH-BAZARGAN-SARASIAB 6 (NORTH OF KERMAN CITY, KERMAN PROVINCE)

 
 
Author(s):  GHADAMI GHOLAMREZA*, BAHRAMPOUR ARMIN, ATAPOUR HABIBE, POOSTI MOHAMMAD, AHMADIPOUR HAMID
 
* DEPARTMENT OF GEOLOGY, FACULTY OF SCIENCE, UNIVERSITY OF HORMOZGAN, HORMOZGAN, IRAN
 
Abstract: 

In the north of Kerman city, between Deh-Bazargan and Sarasiab 6 villages and along the Koohbanan fault, several lamprophyric dykes have been intruded the Shemshak, Bidu and Hodjedk Formations. The dykes show porphyry and glomeroporphyry textures and contain coarse-grained phenocrysts of olivine (30 vol.%), pyroxene (20 vol.%) and amphibole (5 vol.%) crystals in a matrix containing 10 vol.% plagioclase and sanidine microlites, fine-grained pyroxene (20 vol.%) and amphiboles (5 vol.%). Electron microprobe analyses show that the pyroxenes are diopside (Fs7.84-15.11) - (Wo42.20-46.75) - (En41.57-49.24), olivines are chrysolite (Fo85.79-91.20), plagioclases are labradorite (An50.94-66.30) and opaque inclusions in olivines are chrome-spinel (Cr1.3-1.25) - (Fe0.708-0.548) - (Al0.518-0.433). Petrographical evidences such as lack of coarse-grained felsic minerals, the presence of porphyritic texture and the co-existence of coarse-grained pyroxene, olivine and amphibole minerals as well as the similar oxides contents of SiO2 (44.25-46.435 wt.%), MgO (5.81-19.125 wt.%), Na2O (1.55-2.035 wt.%), K2O (1.18-1.715 wt.%) to the average of the well-known alkaline lamprophyres (SiO2=42.5 wt.%, MgO=7.25 wt.%, Na2O=35 wt.%, K2O=25 wt.%), suggest that the studied dykes are similar to the alkaline lamprophyres (monchiquites) rather than calcalkaline spessartites. Thermo-barometric studies of pyroxenes show that the rocks under discussion have been formed under pressure of 5-10 Kb and temperature of 700-900oC with less than 10 percent water contents. Whole rock chemical analyses of the studied lamprophyres indicate that the parent magmas were alkaline type and originated from a metasomatized spinel-garnet-lhezrolite mantle source containing hydrous minerals, then they were emplaced in a post-collisional arc setting.

 
Keyword(s): ALKALINE LAMPROPHYRE, MONCHIQUITE, DEH-BAZARGAN, KERMAN, CENTERAL IRAN
 
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