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
Details:
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,
E-Publications,
E-Books,
PublicationNT,
NTGS Record,
Australia 1:100 000 Geological Map Series Willie 4851,
Australia 1:250 000 Geological Map Series Mount Rennie SF5215,
Date
2018,
2018,
Location
Willie 4851,
Mount Rennie SF5215,
Arunta Region,
Aileron Province,
Warumpi Province,
Australia 1:100 000 Geological MapWillie 4851,
Australia 1:250 000 Geological MapMount Rennie SF5215,
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.,
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.,
Notes
Made available via the Publications (Legal Deposit) Act 2004 (NT),
Drillhole/Well Name: 17GRDD003,
Stratigraphy: Lander Rock Formation; Andrew Young Igneous Complex,
Available from GEMIS - Geoscience Exploration and Mining Information System,
Made available via the Publications (Legal Deposit) Act 2004 (NT),