Distribution of platinum-group elements (PGE) in chromitites of Sabzevar, NE of Iran

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MAZHARI SEYED ALI

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Journal: Iranian Journal of Crystallography and Mineralogy Year:2019 | Volume:27 | Issue:1 Page(s): 109-122

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Information Journal Paper

Title

Distribution of platinum-group elements (PGE) in chromitites of Sabzevar, NE of Iran

Author(s)

MAZHARI SEYED ALI | Issue Writer Certificate

Keywords

chromititeQ2

platinum-group elements (PGE)Q1

boninitic meltQ1

toleiitic meltQ1

sabzevarQ2

Abstract

The chromitite ores of sabzevar ophiolitic zone could be divided into two groups of high Cr and high Al. The concentration of Cr2O3, As, S and some heavy metals (Cu, Ni, Ag, Co, Zn) is higher in high Cr samples; while high Al chromitites show higher concentration of Al2O3, SiO2, TiO2 and other trace elements. The high Cr chromitites have higher PGE than Al-rich samples and PGE concentration increases with Cr2O3. The high Cr chromitites have fractionated PGE chondrite-normalized patterns with negative slope (Pd/Ir = 0. 25) and high IPGE/PPGE (average 6. 22); while high Al chromitites show unfractionated and relatively flat patterns (Pd/Ir = 1. 9, IPGE/PPGE = 2. 88). The PGE composition of high Cr chromitites indicates they are formed by high degrees of partial melting (boninitic melt) in arc setting. In contrast, Al-enriched samples have been produced by low degrees of partial melting (toleiitic melt) beneath spreading centers (i. e., mid-ocean ridges or back-arc basins). The results of PGE composition of sabzevar chromitites are coincident with chemical composition data of chromite crystals in these samples.

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APA: Copy

MAZHARI, SEYED ALI. (2019). Distribution of platinum-group elements (PGE) in chromitites of Sabzevar, NE of Iran. IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY, 27(1 ), 109-122. SID. https://sid.ir/paper/4175/en

Vancouver: Copy

MAZHARI SEYED ALI. Distribution of platinum-group elements (PGE) in chromitites of Sabzevar, NE of Iran. IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY[Internet]. 2019;27(1 ):109-122. Available from: https://sid.ir/paper/4175/en

IEEE: Copy

SEYED ALI MAZHARI, “Distribution of platinum-group elements (PGE) in chromitites of Sabzevar, NE of Iran,” IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY, vol. 27, no. 1 , pp. 109–122, 2019, [Online]. Available: https://sid.ir/paper/4175/en

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