Reply to discussion by A. Aftabi and S. Mohseni on 'Combined igneous and hydrothermal source for the Kiruna-type Bafq magnetite -apatite deposits in Central Iran; trace element and oxygen isotope studies of magnetite' by Mehdipour Ghazi et al. [Ore Geology Reviews 105 (2019) 590-604]

摘要

In this reply, we emphasize on some geological and geochemical evidence that indicate most of the studied deposits (Choghart, Chadormalu and Sechahun) have magmatic origin and they are not related to BIF deposits, as declared by Aftabi and Mohseni (2019). Field studies reveal the existence of at least three types of iron mineralization in the Posht-e-Badam Block; (1) stratiform Fe-oxide (ologist) sublayers within the Neoproterozoic meta-sedimentary units, (2) Iron lenses within the early Cambrian volcano-sedimentary unit, and (3) massive magnetite deposits. We assume that studies by Aftabi and Mohseni (2019) were focused on iron deposits mainly belonging to type 2 iron mineralization above. We proposed contamination of primary silicate magma with older units (similar to Ediacaran bands of magnetite reported by Aftabi and Mohseni, 2019) that include iron, phosphor and sodium which were responsible for triggering immiscibility of Fe-rich melt from silicate magma and formation of the studied massive Iron deposits.