Typochemistry of magnetite from massive sulfide and iron deposits of the Urals according to LA-ISP-MS data

Le résumé fourni par la source

The aim of the study is the determination of mineralogical and geochemical features of magnetite from massive sulfde and iron deposits to develop forecasting criteria of ore objects. The layered magnetitolites of sulfde (Mauk, Letnee, Sibai and Molodezhnoe) and stratiform iron (Kachar, Sarbai, Estyuninskoe, Osokino-Aleksandrovskoe and Techa) deposits of volcanosedimentary association are the objects of study. It is established using laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) that, in contrast to magnetite of iron deposits, magnetite of ore-controlling volcanosedimentary horizons of the Urals massive sulfde deposits is characterized by a higher content and stable associations of Bi, Te, Co, As, Cd, Zn, Cu and Mo due to relict inclusions of sulfde clasts and products of their halmyrolysis. The elevated Ti, V and Zr contents, as well as the mixed associations of lithophile, siderophile and chalcophile elements, are more typical of magnetite of iron deposits after hyaloclastites. Typochemistry of magnetite from volcanosedimentary horizons can be a criterion for searching the massive sulfde deposits.

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