Authors / CoAuthors
Skirrow, R.G. | Cross, A.J. | Magee, C. | Lecomte, A. | Mercadier, J.
Abstract
High-grade gold (Au), copper (Cu) and bismuth (Bi) ores in the Tennant Creek goldfield have been mined from hydrothermal magnetite and/or hematite-rich ironstone bodies. Less well known is a style of Au-Cu-Bi mineralisation hosted by quartz vein systems within shear zones outside ironstones. Sensitive High Resolution Ion Micro Probe (SHRIMP) U-Pb-Th analyses of hydrothermal monazite [(LREE)PO4] associated with this mineralisation style at the Orlando East Au-Cu-Bi deposit and Navigator 6 Au prospect yield ages of 1659 ± 13 Ma and 1659 ± 15 Ma, respectively. These ages are nearly 200 million years younger than the age established from ironstone-hosted ores in the district. This new result widens the exploration ‘search space’ for gold into rock formations previously regarded as too young to host this style of mineralisation. <b>Citation:</b> Skirrow, R.G., Cross, A.J., Magee, C.W., Lecomte, A., and Mercadier, J., 2020. Identification of a new ca. 1660 Ma Au-Cu-Bi metallogenic event at Tennant Creek. In: Czarnota, K., Roach, I., Abbott, S., Haynes, M., Kositcin, N., Ray, A. and Slatter, E. (eds.) Exploring for the Future: Extended Abstracts, Geoscience Australia, Canberra, 1–4.
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document
eCat Id
133170
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Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
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Keywords
- theme.ANZRC Fields of Research.rdf
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- EARTH SCIENCES
- ( Process )
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- SHRIMP U–Pb
- ( Theme )
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- Geochronology
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- Monazite
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- Hydrothermal monazite
- ( Place )
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- Tennant Creek
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- Warramunga Province
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- Mineral Systems
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- Exploring for the Future
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- EftF
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- Published_External
Publication Date
2020-06-26T07:08:04
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completed
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EFTF Abstract
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geoscientificInformation
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This study was completed under the Exploring for the Future initiative, as part of the East Tennant project. Samples were collected from legacy mineral exploration drill cores: Navigator 6 Hole 2, Orlando East H201 and Orlando East H208. This abstract is a summary of that fully reported in: Skirrow R. G., Cross A. J., Lecomte A. & Mercadier J., 2019. A shear-hosted Au-Cu-Bi metallogenic event at ~1660 Ma in the Tennant Creek goldfield (northern Australia) defined by in-situ monazite U-Pb-Th dating. Precambrian Research 332:105402..
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[-20.50, -19.00, 133.50, 135.50]
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