Quartz oxygen isotopes from Tick Hill area in Mount Isa Inlier: indication of a regional fluid overprint

Le, T.X., Dirks, P.H.G.M., Sanislav, I.V., Harris, C., Huizenga, J.M., McCoy-West, H.A., and Manestar, G.N. (2021) Quartz oxygen isotopes from Tick Hill area in Mount Isa Inlier: indication of a regional fluid overprint. Australian Journal of Earth Sciences. (In Press)

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Abstract

At the Tick Hill gold deposit, δ18Oquartz data for the mineralised lithologies and surrounding rocks are similar and fall within a narrow range of 10.5–13.7‰ V-SMOW. The highly mineralised quartzo-feldspathic mylonite has quartz δ18O (δ18Oquartz) values of 11.3–13.6‰, which are similar to values for the surrounding rocks both locally and regionally, i.e. δ18Oquartz by itself does not provide a useful exploration tool. The δ18Oquartz values from the Tick Hill area most likely reflect the late Isan hydrothermal overprint at 1525–1520 Ma. The origin of the altering fluids is unclear, as the δ18Oquartz values overlap with reported δ18O values calculated for both metamorphic and igneous fluids. When combining the δ18Oquartz results with δ18Ocalcite results available from the literature, a temperature of 350–550 °C was calculated, which is consistent with observed alteration assemblages associated with gold mineralisation.

Item ID: 69695
Item Type: Article (Research - C1)
ISSN: 1440-0952
Keywords: oxygen isotope; Mount Isa; Mary Kathleen; Tick Hill; gold deposit; Isan Orogeny
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Copyright Information: © 2021 Geological Society of Australia
Additional Information:

A version of this publication was included as Chapter 6 of the following PhD thesis: Le, Truong Xuan (2021) Geological characteristics, genesis and ore controlling factors of the Tick Hill Au deposit, Dajarra District, NW Queensland, Australia. PhD thesis, James Cook University, which is available Open Access in ResearchOnline@JCU. Please see the Related URLs for access.

Date Deposited: 20 Oct 2021 03:13
FoR Codes: 37 EARTH SCIENCES > 3703 Geochemistry > 370303 Isotope geochemistry @ 50%
37 EARTH SCIENCES > 3703 Geochemistry > 370301 Exploration geochemistry @ 50%
SEO Codes: 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280107 Expanding knowledge in the earth sciences @ 100%
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