Maggie Hays Ni Deposit: Part 1. Stratigraphic Controls on the Style of Komatiite Emplacement in the 2.9 Ga Lake Johnston Greenstone Belt, Yilgarn Craton, Western Australia

Heggie, Geoffrey J.; Fiorentini, Marco L.; Barnes, Stephen J.; Barley, Mark

doi:10.2113/econgeo.107.5.797

Cited by 15 publications

(1 citation statement)

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“…A younger limit is indicated by the age of ca 2656 Ma for the post-kinematic Lake Seabrook granite (Qiu et al 1999). Other major structural features of the belt include the northwest-trending Tay fault and More recently, ultramafic units within the Lake Johnston belt stratigraphy have been further divided into the eastern, central and western ultramafic units (Perring 1995;Buck et al 1998;Heggie 2010, Heggie et al 2012a. Recent mapping by the Geological Survey of Western Australia (Figure 4), together with complementary geochemical and geochronological analyses, indicates a more complex stratigraphy, with the intrusive Lake Medcalf Igneous Complex occurring between the Maggie Hays and Honman formations, as well as parts of the Roundtop Komatiite intruding the Honman Formation ( Figure 3b).…”

Section: The Lake Johnston Greenstone Beltmentioning

confidence: 99%

Geochronological constraints on nickel metallogeny in the Lake Johnston belt, Southern Cross Domain

Romano

Thébaud

Mole

et al. 2013

Australian Journal of Earth Sciences

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Section: The Lake Johnston Greenstone Beltmentioning

confidence: 99%

Geochronological constraints on nickel metallogeny in the Lake Johnston belt, Southern Cross Domain

Romano

Thébaud

Mole

et al. 2013

Australian Journal of Earth Sciences

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In situ multiple sulfur isotope analysis by SIMS of pyrite, chalcopyrite, pyrrhotite, and pentlandite to refine magmatic ore genetic models

et al. 2016

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With growing interest in the application of in situ multiple sulfur isotope analysis to a variety of mineral systems, we report here the development of a suite of sulfur isotope standards for distribution relevant to magmatic, magmatic-hydrothermal, and hydrothermal ore systems. These materials include Sierra pyrite (FeS2), Nifty-b chalcopyrite (CuFeS2), Alexo pyrrhotite (Fe(1-x)S), and VMSO pentlandite ((Fe,Ni)9S8) that have been chemically characterized by electron microprobe analysis, isotopically characterized for δ 33 S, δ 34 S, and δ 36 S by fluorination gas-source mass spectrometry, and tested for homogeneity at the micro-scale by secondary ion mass spectrometry. Beam-sample interaction as a function of crystallographic orientation is determined to have no effect on δ 34 S and Δ 33 S isotopic measurements of pentlandite. These new findings provided the basis for a case study on the genesis of the Long-Victor nickel-sulfide deposit located in the world class Kambalda nickel camp in the southern Kalgoorlie Terrane of Western Australia. Results demonstrate that precise multiple sulfur isotope analyses from magmatic pentlandite, pyrrhotite and chalcopyrite can better constrain genetic models related to ore-forming processes. Data indicate that pentlandite, pyrrhotite and chalcopyrite are in isotopic equilibrium and display similar Δ 33 S values +0.2‰. This isotopic equilibrium unequivocally fingerprints the isotopic signature of the 2 magmatic assemblage. The three sulfide phases show slightly variable δ 34 S values (δ 34 Schalcopyrite = 2.9 ± 0.3‰, δ 34 Spentlandite = 3.1 ± 0.2‰, and δ 34 Spyrrhotite = 3.9 ± 0.5‰), which are indicative of natural fractionation. Careful in situ multiple sulfur isotope analysis of multiple sulfide phases is able to capture the subtle isotopic variability of the magmatic sulfide assemblage, which may help resolve the nature of the ore-forming process. Hence, this SIMS-based approach discriminates the magmatic sulfur isotope signature from that recorded in metamorphic-and alteration-related sulfides, which is not resolved during bulk rock fluorination analysis. The results indicate that, unlike the giant dunite-hosted komatiite systems that thermo-mechanically assimilated volcanogenic massive sulfides proximal to vents and display negative Δ 33 S values, the Kambalda ores formed in relatively distal environments assimilating abyssal sulfidic shales. HIGHLIGHTS  Characterisation of four sulfide standards for multiple sulfur isotope analysis: pyrite, chalcopyrite, pyrrhotite, and pentlandite for distribution  Analysis of orientation effect in pentlandite  Natural sulfur isotope fractionation between pentlandite and pyrrhotite  Case study multiple sulfur isotope analysis of three sulfide phases within world-class Long-Victor komatiite-hosted nickel-sulfide deposit KEYWORDS Multiple sulfur isotopes, SIMS, in situ, sulfide minerals, ore genesis 1.

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Time-space evolution of an Archean craton: A Hf-isotope window into continent formation

Mole

Kirkland

Fiorentini

et al. 2019

Earth-Science Reviews

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Maggie Hays Ni Deposit: Part 1. Stratigraphic Controls on the Style of Komatiite Emplacement in the 2.9 Ga Lake Johnston Greenstone Belt, Yilgarn Craton, Western Australia

Cited by 15 publications

References 85 publications

Geochronological constraints on nickel metallogeny in the Lake Johnston belt, Southern Cross Domain

Geochronological constraints on nickel metallogeny in the Lake Johnston belt, Southern Cross Domain

In situ multiple sulfur isotope analysis by SIMS of pyrite, chalcopyrite, pyrrhotite, and pentlandite to refine magmatic ore genetic models

Time-space evolution of an Archean craton: A Hf-isotope window into continent formation

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