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Title: Constraints on the timing of sulfide breccia formation at the Grapple Cu-Au-Ag-Zn prospect, central Australia: in situ LA-ICP-MS monazite geochronology of a new Proterozoic greenfields discovery
Report ID: NTGS Record 2018-013
Year: 2018
Author: Reno, BL
McGloin, MV
Meffre, S
Drillhole/Well Name: 17GRDD003
Geological Province: Arunta Region
Aileron Province
Warumpi Province
Map250: Mount Rennie SF5215
Map100: Willie 4851
Subject: Geochronology
Stratigraphy: Lander Rock Formation
Andrew Young Igneous Complex
Abstract: Monazite was dated in one sample of andalusite-biotite-muscovite schist from the Lander Rock Formation that hosts sulfide mineralisation at the Grapple Cu-Au-Ag-Zn-Pb-Co prospect, Willie (MOUNT RENNIE) in the Aileron Province, Northern Territory. Monazite dating was carried out in order to constrain the timing of mineralisation in this Proterozoic greenfields area. A single 207Pb/206Pb date of ca 1719 Ma obtained for monazite included in andalusite may relate to monazite growth prior to or during metamorphism. A 207Pb/206Pb age of 1668 +/- 7 Ma for monazite overprinting the main mylonite fabric is interpreted to be related to hydrothermal fluid flow during, or shortly after, mylonite formation in this sample. Based on cross-cutting relationships observed in drill core, this monazite age places a maximum timing constraint on sulfide breccia formation at the Grapple prospect, and suggests a likely mineralisation age. The age is similar to the emplacement age of ca 1640 Ma for the Andrew Young Igneous Complex, and other magmatism on MOUNT RENNIE, indicating a plausible genetic link between these igneous intrusions and the sulfide mineralisation.
Publisher: Northern Territory Geological Survey
ISSN: 1443-1149
ISBN: 9780724573417 (PDF)
Document Type: NTGS Record
Access Constraint: Creative Commons Attribution 4.0 International (CC BY 4.0). Please observe and retain any copyright or related notices that accompany this material and give attribution to: Northern Territory of Australia (Northern Territory Geological Survey).
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