Regional organic geochemistry of host sediments of Palaeoproterozoic McArthur River Ore deposit, Australia |
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| Authors: | Karen L Mackenzie Craig P Marshall Malcolm R Walter |
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| Institution: | (1) School of Geosciences, University of Sydney, Sydney, NSW, 2006, Australia;(2) Water and Environment Business Unit, Sinclair Knight Merz, 263, Adelaide Terrace, Perth, WA, 6000, Australia;(3) Australian Centre for Astrobiology, Department of Earth and Planetary Sciences, Macquarie University, Sydney, NSW, 2109, Australia;(4) Present address: School of Chemistry, University of Sydney, Sydney, NSW, 2006, Australia |
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| Abstract: | The 1,640 Ma HYC (Here’s Your Chance) deposit at McArthur River, Northern Territory, Australia, is one of the largest and
least metamorphosed Proterozoic stratiform lead-zinc-silver deposits in the world. The thermal history of the deposit is a
currently not well understood, both low and high temperature mechanisms have been proposed. From our study we were able to
estimate (from both kerogen and bitumen thermal maturity indices which concur) the thermal maturity to be equivalent to Ro
1.1–2.0%, corresponding to the wet gas generation zone, with a maximum relatively low burial temperature range of 120–180 °C
in the ore samples. Regionally, temperatures were not further constrained due to the complex and dynamic nature of the sedimentary
environment.
Contribution to the 65th Birthday Festschrift Issue. |
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| Keywords: | Hydrothermal Bitumen Mineralisation Kerogen Raman spectroscopy |
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