Zhang, Dexian, Oliver, Nicholas H.S., Rusk, Brian G., Chang, Zhaoshan, and Colman, Robert (2017) Trace element geochemistry of magnetite from Ernest Henry IOCG deposit, Australia. In: Mineral Resources to Discover (3) pp. 975-978. From: 14th SGA Biannual Meeting, 20-23 August 2017, Quebec City, Canada.

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Abstract

Trace element geochemistry of magnetite was used to consider mineralisation processes and vectors around the pipe-like Ernest Henry IOCG hydrothermal breccia deposit. Although EMPA mapping shows that individual magnetites are not zoned with respect to trace element distribution, LA ICP-MS results show that different magnetites from the same or nearby samples may vary widely in composition, and the variability in composition itself is of genetic importance. The most abundant trace elements in magnetite are Mg, Al, Ti, V, Cr, Mn, Co, Ni and Sn. There are no clear patterns that relate to paragenesis or adjacent mineral assemblages. Regional magnetites and those on the flank of the orebody show a high standard deviation in abundance of Mn, Ti, Al and V, for both replacive types and vein/breccia hydrothermal cement. In the core of the orebody, magnetite shows lower standard deviation of all these elements and tends to be lower in Al and higher in Mn, particularly towards the deep core of the orebody. This zonation is interpreted as a predominant influx of primary Mn-rich ore fluids from depth with the breccia, interacting upwards and outwards with both wall rocks and another fluid as the orebody precipitated.

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