Petrological Journal

Geochemical, mineralogical and fluid inclusion studies of Cu, Ni, Co and U of Meskani ore deposit, Anarak (Central Iran)

Bahman Mokhtarzadeh Mohammadi; Hashem Bagheri

Volume 2, Issue 5 , June 2011, Pages 1-18

Abstract

The Meskani ore deposit is located in the Central Iran and Anarak-Khur metamorphic area. Microscopic studies were conducted on polished, thin polished and double polished thin sections ... Read More The Meskani ore deposit is located in the Central Iran and Anarak-Khur metamorphic area. Microscopic studies were conducted on polished, thin polished and double polished thin sections of quartz and calcite minerals from ore bearing veins. Chalcocite, Nickeline, Chalcopyrite, Rammelsbergite and Malachite were recognized which Nickeline is surrounded by Rammelsbergite representing deposition of nickel and increasing of arsenide in ore bearing solutions. Most of the studied fluid inclusions are from liquid rich two phases (L + V) type. Genetically, primary types were selected for this study. Based on freezing studies, calculated temperature of last melting point (Tlm) is from -1.6 to -18.5 Â°C that is equal to 2-22.5 % wt eq. NaCl. Heating studies, have revealed a homogenization temperature (TH) range of 130-160 Â°C. Homogenization temperature - salinity binary plots show two distinct fluids that can represent two different phases of mineralization or two distinct different sources of ore bearing fluids. Probably one of them represents volcanogenic ore bearing fluid and the other represents basinal brine ore bearing solution. The geochemical analysis of collected samples from different parts of Meskani ore deposit, elements including Co, Ni, Cu, Zn, Pb, Th, U, Zr and Sr were determined among of them Co, Cu, Ni and U are the most important. Scatter diagrams of these elements were plotted and their correlations determined. Results of these analyses revealed that the average of U, Th, Ni, Cu are 269, 26, 452, 10786 ppm, respectively. Another interesting feature is the inverse correlation between U content and Th/U ratio. This feature represents that high U content in these rocks is not related to magmatic differentiation. In contrast of vein samples, there is not any correlation between U, Cu and Ni changes in country rock samples. This is one of the specific characteristics of shoshonites and andesites that represent these elements have not been originated from country rocks. The geochemical and petrographical studies have shown that country rocks are mainly shoshonitic in composition.

Mineral chemistry of mantle peridotites from Loghar ophiolite (Southweast of Kabul - Afghanistan)

Gholamhossein Nazari; Ghodrat Torabi; Mahmoud Khalili

Volume 2, Issue 5 , June 2011, Pages 19-48

Abstract

The Loghar ophiolite is located in ophiolitic belt of Kabul block (southeast of Afghanistan) and it is a part of Neotethyan ophiolites in Alpine - Himalayan orogenic system with Eocene ... Read More

Typology and tectonic setting of the Qorveh granitoid (Kurdistan Province, western Iran)

Ashraf Torkain

Volume 2, Issue 5 , June 2011, Pages 49-66

Abstract

The south Qorveh granitoid plutons (Kurdistan) which have intruded into the regionally metamorphosed rocks (Kimmerian Orogeny) lie in 80 km NW of Hamedan city. They composed predominantly ... Read More

Granulite facies metamorphism of the olivine bearing dolomitic marbles in Takab area, NW Iran

Robab Hajialioghli

Volume 2, Issue 5 , June 2011, Pages 67-80

Abstract

The Takab metamorphic complex in the NW of Iran, is located between longitude 47ï°45' and 47ï°05' E and latitude 37ï°30' and 36ï°30' N. The ... Read More

Evaluation of thermodynamic conditions (P-T) in formation of Jandaq metapelitic schists (Northeast of Isfahan province)

Sayed Mohsen Tabatabaei manesh; Morteza Sharifi

Volume 2, Issue 5 , June 2011, Pages 81-92

Abstract

The metapelites of Jandagh, (based on mineral assemblages) can be divided into four categories: quartz- muscovite schists, quartz- muscovite- biotite schists, garnet- muscovite-chlorite ... Read More

Geochemical and petrological reconstruction of the Talle-Pahlevani mafic-ultramafic intrusions Shahre-Babak, Iran

Abdolnaser Fazlnia

Volume 2, Issue 5 , June 2011, Pages 93-112

Abstract

The Talle-Pahlevani mafic-ultramafic intrusions located in northwest and south of leuco-quartz dioritic and anorthositic batholiths developed in the southwestern Sanandaj-Sirjan zone ... Read More The Talle-Pahlevani mafic-ultramafic intrusions located in northwest and south of leuco-quartz dioritic and anorthositic batholiths developed in the southwestern Sanandaj-Sirjan zone (173 Ma). These intrusions consist primarily of gabbro in association with veins and lenses of anorthosite, trectolite, clinopyroxenite, and wehrlite which show gradual and sometimes sharp boundaries with the gabbro. In the gradual boundaries, the gabbro are mineralogically transformed into anorthosites and wehrlites. On the other hand, in the sharp boundaries, the mineral assemblages in two sides are different. There is no clear deformation in the Talle-Pahlevani mafic-ultramafic intrusions. Hence, the changes in mineral compositions are the result of crystallization processes in the magma chamber. The chemical changes, especially for REE, from anorthosite and wehrlite veins and lenses toward gabbro in the gradual boundaries are continuous. The changes are presumably resulted from different crystallization processes in the different parts of the intrusions that cause crystallization of anorthosite, clinopyroxenite, and wehrlite cumulates in the intrusions. Rocks of the sharp boundaries show sudden chemical changes, but the changes exhibit the same patterns of increasing and decreasing of the elements, especially for REE. Therefore, it is possible that all parts of the intrusions were formed from the same parental magma. Parts with unequilibrium crystallization in the form of cumulus and sub-solidification, underwent fractures, and were interspersed throughout the magma chamber due to late injection pulses or mechanical movements. The geological and age data show that the intrusions generated from an Al2O3, Sr-, and FeO-enriched and K- and Nb-depleted tholeiitic basaltic magma likely partial melting 5-30 wt. % of the spinel-peridotite mantle within an incipient rift system. Then, the magma was crystallized in lower crust (relatively high P.) magma chamber.

Genesis of unusual mineral assemblage in the trondhjemites of Soltan Abad area (NE Sabzevar): evidences of crystallization and emplacement conditions of magma

Mohsen Nasrabady

Volume 2, Issue 5 , June 2011, Pages 113-132

Abstract

Some intrusion bodies have been injected into the metamorphic complex consisting of green schist, blue schist and Garnet-amphibolite rocks in Soltan Abad area (NE Sabzevar). The intrusion ... Read More

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Volume & Issue: Volume 2, Issue 5, June 2011

Geochemical, mineralogical and fluid inclusion studies of Cu, Ni, Co and U of Meskani ore deposit, Anarak (Central Iran)

Abstract

Mineral chemistry of mantle peridotites from Loghar ophiolite (Southweast of Kabul - Afghanistan)

Abstract

Typology and tectonic setting of the Qorveh granitoid (Kurdistan Province, western Iran)

Abstract

Granulite facies metamorphism of the olivine bearing dolomitic marbles in Takab area, NW Iran

Abstract

Evaluation of thermodynamic conditions (P-T) in formation of Jandaq metapelitic schists (Northeast of Isfahan province)

Abstract

Geochemical and petrological reconstruction of the Talle-Pahlevani mafic-ultramafic intrusions Shahre-Babak, Iran

Abstract

Genesis of unusual mineral assemblage in the trondhjemites of Soltan Abad area (NE Sabzevar): evidences of crystallization and emplacement conditions of magma

Abstract