The Geochemistry of the Marmoraton Fe Skarn and Associated Syenodiorite Intrusion, Grenville Province, S. Ontario

This research focuses on the major and trace element geochemistry of the Marmoraton Fe skarn and associated intrusive material in the Grenville Province, southern Ontario. The analytical methods used are NAA, XRF and LA-ICPMS. The plotted analytical data show clear trends and clustering, representing accurate sample collection and classification. Co is enriched in sulphide-rich samples to sub-ore grade. No consistent, significant enrichments in Au, Pd and Pt were observed; however, one Cu and Co enriched sample contains sub-ore grade Pd (∼1 g/t). The intrusion geochemistry suggests that there is limited distal Au mineralization potential. The intrusion geochemistry is consistent with Marmoraton being an Fe-only skarn based on the data and plots of Meinert (1995). The REE values are not sufficiently significant to be considered of economic potential. There is a ∼15 km long crescent shaped magnetic anomaly containing magnetite skarns that indicates a major sub-surface Fe (magnetite) resource. The syenodiorite intrusion at Marmoraton should be dated to establish the timing of the intrusion and associated mineralization.