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Mineralogy, geochemistry and petrogenesis of igneous inclusions within three inactive diapirs, Zagros belt, Shahre-kord, Iran

Published online by Cambridge University Press:  05 July 2012

SEDIGHEH TAGHIPOUR ,
MAHMOUD KHALILI ,
MOHAMMAD ALI MACKIZADEH ,
ALI KANANIAN  and
BATOUL TAGHIPOUR
SEDIGHEH TAGHIPOUR*
Affiliation:
Department of Geology, Faculty of Sciences, University of Isfahan, Isfahan, Iran Department of Geology, College of Sciences, University of Tehran, Tehran, Iran
MAHMOUD KHALILI
Affiliation:
Department of Geology, Faculty of Sciences, University of Isfahan, Isfahan, Iran
MOHAMMAD ALI MACKIZADEH
Affiliation:
Department of Geology, Faculty of Sciences, University of Isfahan, Isfahan, Iran
ALI KANANIAN
Affiliation:
Department of Geology, College of Sciences, University of Tehran, Tehran, Iran
BATOUL TAGHIPOUR
Affiliation:
Department of Earth Sciences, Faculty of Sciences, Shiraz University, Shiraz, Iran
*
†Author for correspondence: [email protected]
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Abstract

The Kaj-Rostam Abad, Dashtak and Doab diapirs are part of the Precambrian–Cambrian Hormuz series that are rich in igneous inclusions concentrated by dissolution of diapiric salt. They are situated in the Iran–Pakistan salt range and commonly associated with inclusions of basalt, trachyte, andesite, micro-gabbro, gypsum and anhydrite, with lesser amounts of carbonate rocks. The mineral assemblage in these inclusions developed in three stages: (I) magmatic stage (diopside, Ti-augite, kaersutite, plagioclase, apatite, biotite and opaque minerals), (II) late magmatic stage (biotite, quartz, chlorite, albite, calcite, titanite, epidote, actinolite and opaque minerals) and (III) vein mineralization (quartz, chlorite, albite, calcite, garnet, epidote, opaque minerals and actinolite). Clinopyroxene is diopside to Ti-augite. Actinolite, kaersutite, albite and pycnochlorite are constituents of the metasomatic rocks of the area. Chlorite geothermometry yielded a temperature of 330–500 °C for chlorite formation. Clinopyroxene thermobarometry ranges from 960 ≤ T ≤ 1440 °C and 1 ≤ P ≤ 10 kbar. The presence of halite-bearing fluid inclusions in hydrothermal quartz veins with homogenization temperatures between 320 and 350 °C points to strong evidence of hydrothermal events. The salinity of these fluids is 39.8–42.7 wt% NaCl. δ18O data on hydrothermal quartz veins range from 14.89 to 22.09 ‰ (SMOW), indicating that the studied samples were affected by fluids originated from sedimentary-evaporitic rocks. Meteoric water that penetrated the evaporitic rocks likely mixed with late magmatic fluids while subjected to magmatic heat, when buried to depths of several kilometres by the Phanerozoic cover sequence. Whole-rock geochemistry data for the studied rocks emphasize their alkaline to sub-alkaline affinities, in a transitional magmatic series.

Keywords

salt diapirigneous inclusionZagros beltIran
Type
Original Articles
Information
Geological Magazine , Volume 150 , Issue 1 , January 2013 , pp. 72 - 88
Copyright
Copyright © Cambridge University Press 2012

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