Geochemistry and genesis of chromites from Darvazeh-Chenar (Neyriz) and Faryab areas

Abstract

The Darvazeh-Chenar mafic- ultramafic body is part of ophiolitic complex of Neyriz in Fars Province that formed in association with closing of Neo-Tethys Ocean and Arabian- Iranian plate collision in Cretaceous. The Faryab ophiolitic rocks are also remnant of block of Tethys oceanic crust that were obducted on continental margins in late Cretaceous period. MgO, Fe2O3, Al2O3, Cr2O3 and TiO2 contents in Darvazeh-Chenar correspond to podiform chromites, which formed by a magma with bonititic composition containing high Cr# and low content of TiO2, in a subduction zone. Faryab chromites have relatively high contents of Al2O3 and TiO2 and have Cr# between 45.8 to 55.7, and originaged from a magma with the composition similar to that of the mid-oceanic ridge.

Keywords


]1[ آقانباتی ع.، "زمین شناسی‌‌ایران"، سازمان زمین شناسی و اکتشافات معدنی کشور (1383).

]2[ حشمت بهزادی ک.، شهاب پور ج.، "ژئوشیمی و مکانیسم تشکیل و جایگیری ذخایر کرومیت مناطق اسفندقه و فاریاب واقع در استان کرمان"، بیست و نهمین گردهمایی علوم زمین (1389).

]3[ قربانی م.، "دیباچه‌‌ای بر زمین شناسی اقتصادی ‌‌ایران"، انتشارات سازمان زمین شناسی واکتشاف معدنی کشور (1381).

[4] Hallam A., "Geology and plate tectonics interpretation of the sediments of the Mesozoic radiolarit-ophiolite complex in the Neyriz region, Southern Iran", Geological Society of America Bulletin 87 (1976) 47-52.

[5] Melcher F., Grum W., Simon G., Thalhammer T. V., Stumfl F., "Petrogenesis of the ophiolitic giant chromite deposits of Kempirisai, Kazakhstan: a study of solid and fluid inclusions in chromite", J. Petrol, 38 (1997) 1419-1458.

[6] Sarkarinejad K., "Structural and microstructural analysis of paleotransform fault zone in Neyriz ophiolite, Iran", Geological Society of London Special Publication 218 (2003) 129-145.

[7] Babaie H.A., Ghazi A.M., La Tour T.E., Hassanipak A.A., "Geochemistry of arc volcanic rocks of the Zagros crush zone, Neyriz, Iran", Journal of Asian Earth Sciences, 19 (2001) 61–76.

[8] Shafaii Moghadam H., "The Dehshir Ophiolites (Central Iran): Geochemical constraint on the origin and evolution of the Inner zagros ophiolite belt", GSA Bulletin 122 (2010) 1516–1547.

]9[ سبقتی ع.، "تاثیر دگرگونی و هوازدگی بر پایداری شیب‌های سنگی بر اساس شرایط موجود در معدن فاریاب"، پایان نامه کارشناسی ارشد، دانشگاه امیرکبیر (1378).

]10[ صفایی م.، "ژئوشیمی ‌و زمین شناسی کانسار کرومیت فاریاب هرمزگان"، پایان نامه کارشناسی ارشد، دانشگاه شیراز (1374).

[11] Huber., " Explanatory text of the Minab quadrangle map 1:250,000", Geological survey of Iran No, J13 (1978).

[12] Pazand K., Aliniya F., Ghanbari Y., Hassani H., Aghavali Nasrin., "A reconnaissance study of platinum group elements (PGE) contents from sulfide mineralization in pyroxenites in Faryab ophiolite of Iran", Arab J Geosci 5 (2011) 1021-1029.

[13] Proenza J., Gervilla F., Melgarejo J. C., Bodinier J.-L., "Al-rich and Cr-rich chromitites from the ayari- Baracoa ophiolitic belt (Eastern Cuba) as the consequence of interaction between volatile-rich melts and peridotites in suprasubduction mantle", Econ. Geol. 94 (1999) 547–566.

[14] Bridge J.C., Prichard H.M., "Podiform chromite-bearing ultramafic rocks from the Braganca Massif, northern Portugal: fragments of island arc?" Geology Mag, 132 (1995) 39-49.

[15] Rollinson H., "Chromite in the mantle section of the Oman ophiolite: A new genetic model", The Island Arc 14 (2005) 542–550.

[16] Zhou M. F., Robinson P. T., "Origin and tectonic environment of podiform chromite deposits", Economic Geology 92 (1997) 259-262.

[17] Najafzadeh A. R., Arvin M., Pan Y., Ahmadipour H., "Podiform Chromitites in the Sorkhband Ultramafic Complex, Southern Iran: Evidence for Ophiolitic Chromitite", Journal of Sciences, GSI 19 (2008) 49–65.

[18] Kamenetsky V.S., Crawford A.J., Meffre S., "Factors controlling chemistry of magmatic spinel: An empirical study of associated olivine, Cr-spinel and melt inclusions from primitive rocks", Journal of Petrology 42 (2001) 655–671.

[19] Mohammad Y. O., "Serpentinites and their tectonic signature along the Northwest Zagros Thrust Zone, Kurdistan Region, Iraq", Arab J Geosci 4 (2011) 69–83.

[20] Page P., Bedard J. H., Schroetter J.-M., Tremblay A., "Mantle Petrology and Mineralogy of the Thetford, Mines Ophiolite Complex", Lithos 100 (2008) 255–292.

[21] Zaccarini F., Pushkarev E., Garuti G., "Plutinum-group element mineralogy and geochemistry of chromitite of the Kluchevskoy ophiolite complex, central Urals (Russia)" , Ore geology rew 33 (2001) 20-30.

[22] Dick H.J.B., Bullen T., "Chromian spinel as a petrogenetic indicator in abyssal and alpine-type peridotite s and spatially associated lavas", Contributions to Mineralogy and Petrology 86 (1984) 54–76.

[23] Zhou M., Robinson P.T., Malpas J., Edwards S.J., QI L., "REE and PGE geochemical constraints on the formation of dunites in the Luobusa ophiolite, southern Tibet", J. Petrol 46 (2005) 615-639.