SULFIDE MINERALIZATION IN ULTRAMAFIC ROCKS OF THE NEHBANDEAN OPHIOLITE COMPLEX

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ADELPOUR MANSOUR; ROSTAMI PAYDAR GHODRATOLLAH

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Journal: GEOCHEMISTRY Year:2016 | Volume:5 | Issue:2 Page(s): 189-198

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Title

SULFIDE MINERALIZATION IN ULTRAMAFIC ROCKS OF THE NEHBANDEAN OPHIOLITE COMPLEX

Author(s)

ADELPOUR MANSOUR | ROSTAMI PAYDAR GHODRATOLLAH | Issue Writer Certificate

Keywords

SULFIDEQ1

MINERALIZATIONQ2

ULTRAMAFIC ROCKQ2

OPHIOLITEQ2

NEHBANDANQ2

Abstract

The NEHBANDAN OPHIOLITE complex (NOC) crops out in the Sistan suture zone, which marks the boundary between the Lut and Afghan continental blocks in the east Iran. After field studies in this area, 21 thin sections plus 32 polished sections were prepared for petrological and mineralogical studies, respectively. Furthermore, 6 least-altered and fractured samples were selected for geochemical studies. Major oxides were determined using XRF analyses.9 samples were selected for ICP-OES and Fire Assay analysis.Three different sequences of ophiolitic rocks can be recognized in the NOC: 1) mantle derived peridotites consisting of clinopyroxene- (Cpx-) rich harzburgites and depleted harzburgites; 2) olivine websterite-pyroxenite-gabbronorite sequence; 3) wehrlite-troctolite-cumulate gabbro-basalt sequence. Clinopyroxene bearing harzburgite and harzburgite are common rock types in the area. These rocks underwent strong serpentinization, during sea floor hydrothermal alteration. Listvenite occurs as dykes or pods in the peridotites. In the study area, more SULFIDE MINERALIZATION (chalcopyrite, chalcocite, covellite, digenite and bornite) occurred in the Cpx-rich harzburgite rocks. In addition of SULFIDE minerals, native copper, oxides minerals such as cuprite-tenorite and carbonate of copper was observed. Petrographic investigation of SULFIDEs in host ultramafics indicated two SULFIDE generations. In the first generation, primary magmatic SULFIDE minerals occurred as interstitial disseminations, generally as anhedral grains. In the second generation, SULFIDE minerals formed as veinlets along host rock fractures. Grade of gold in mineralized samples is high and shows good correlation with copper and iron elements, whereas free mineral of Au wasn't recognized. Considering the extensive outcrops of serpentinized ULTRAMAFIC ROCKs and listvenite in the region can be considered the source of Cu, Au and Fe in related to serpentinized ULTRAMAFIC ROCKs.

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APA: Copy

ADELPOUR, MANSOUR, & ROSTAMI PAYDAR, GHODRATOLLAH. (2016). SULFIDE MINERALIZATION IN ULTRAMAFIC ROCKS OF THE NEHBANDEAN OPHIOLITE COMPLEX. GEOCHEMISTRY, 5(2), 189-198. SID. https://sid.ir/paper/230910/en

Vancouver: Copy

ADELPOUR MANSOUR, ROSTAMI PAYDAR GHODRATOLLAH. SULFIDE MINERALIZATION IN ULTRAMAFIC ROCKS OF THE NEHBANDEAN OPHIOLITE COMPLEX. GEOCHEMISTRY[Internet]. 2016;5(2):189-198. Available from: https://sid.ir/paper/230910/en

IEEE: Copy

MANSOUR ADELPOUR, and GHODRATOLLAH ROSTAMI PAYDAR, “SULFIDE MINERALIZATION IN ULTRAMAFIC ROCKS OF THE NEHBANDEAN OPHIOLITE COMPLEX,” GEOCHEMISTRY, vol. 5, no. 2, pp. 189–198, 2016, [Online]. Available: https://sid.ir/paper/230910/en

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