Scientific Quarterly Journal of Geosciences

Scientific Quarterly Journal of Geosciences

Occurrence and geochemistry of chromite mineral, PGE(S) and REE in the Khaj-e-Jamali-Mines-Neyris-Iran

Document Type : Original Research Paper

Authors
Arsia Moghtaderi 1
Ahmad Khakzad 2
Sasan Liaghat 3
1 Geology Department, Earth Sciences Faculty , Shahid Beheshti University, Tehran, Iran
2 Geology Department, Earth Sciences Faculty, Shahid Beheshti University , Tehran, Iran
3 Department of Geology, Earth sciences Faculty, Shiraz University, Iran
Abstract
The Khajeh-e-Jamali chromite mines are located in southwestern Iran, about 100 km north-west of Neyriz and 150 km north-east of the city of Shiraz. Field, microscopic and geochemical studies indicate that partial melting, magmatic segregation and magmatic miscibilty were responsible for the generation of the Khajeh-e-Jamali deposits. MORB and boninitic magmatic series are considered to have formed this Alpine type deposit.
Ru, os and Ir enrichment in chromite and in host rock (dunite and harzburgite) implies the deficiency or lack of sulphur phase and hence higher values of ƒo2 during the crystallization. Similarity in the correlation pattern of [Al, Ir] and [Cr, Ir], positive correlation of Ir and Cr, lower value of ƒs2 in early stages of crystallization, association of various phases, lack of preferred orientation of platin group metals (PGM) in chromite crystals and double - phase inclusions indicate a similarity in the deposition of Cr and PGM from a boninitic melt, simultaneous crystallization of chromite and IPGMs during the slow cooling or fractional crystallization and mixing of boninitic magma with a silica bearing liquid (transitional zone gabbro), lack of exsolution arid the association of PGMs with chromite composition. Wide v-shaped pattern of REE spider diagram is a confirmation of partial melting and the presence of boninitic series.
Keywords
Chromite
melt - rock interaction Alpine type deposit
Harzburgite
Dunite
Khaji-e- Jamali mine
Neyriz
Iran

Subjects

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Scientific Quarterly Journal of Geosciences
Volume 12, 47-48
Spring & Summer 2003, Vol. 12, No. 47-48
Autumn 2003
Pages 78-95