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- W2752830033 abstract "The > 1510-1500 Ma Ernest Henry Fe-oxide-Cu-Au orebody is a hydrothermal deposit hosted in K-feldspar altered ca 1740 Ma plagioclase phyric volcanic rocks in the Cloncurry district, Mount Isa Inlier. Mineralization occurred late in a post-peak metamorphic hydrothermal system, and the ore is mainly hosted in an infill-supported hydrothermal breccia that grades to crackle veining at the margins. The ore body has a > l km down dip extension, and is structurally-controlled between two shear zones that trend NE-SW and dip 35° to the SE. The ore is mainly composed of subrounded clasts separated by a fine- to medium grained infill composed of magnetite, calcite, pyrite, biotite, K-feldspar, c halcopyrite, hematite, garnet, barite, fluorite, quartz and molybdenite. The deposit exhibits a number of geochemical and isotopic haloes (e.g. K, S and 0180) that extend to different distances beyond economic mineralization. Most notably the combination of enriched Mn, K and Ba produce a geochemical halo that is present only around the Ernest Henry and Monakoff deposits, in the northern part of the Cloncurry district. The dominant magmatic stable isotope composition of the ore-related fluids (ca400-450°C) suggest that magmas were significant contributors of fluid and/or S. However, metals, REE, Ba and U could have been derived from an alternate source (e.g. saline metamorphic fluids). The chemical affinities of the elements enriched in the Ernest Henry ore (e.g. Fe, Cu, Au, K, Ba, S, As, U, LREE, Mo, W, Co, As, F, Ca and C) suggest that they were carried by more than one fluid, and that a mixed origin involving two or more fluids (cf. Olympic Dam and Salobo Cu) is the preferred model for ore deposition. The magnetite 'U-, K-, Mo- and As-rich composition and disseminated character of sulphides in the Ernest Henry ore and its related halo suggests that this type of system is readily detectable using airborne (e.g. magnetics and radiometries) and ground (e.g. EM and IP) geophysical techniques." @default.
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- W2752830033 date "2000-09-01" @default.
- W2752830033 modified "2023-09-28" @default.
- W2752830033 title "The evolution of the Ernest Henry Fe-OXIDE-(Cu-Au) hydrothermal system" @default.
- W2752830033 hasPublicationYear "2000" @default.
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