In-situ Lu-Hf geochronology of calcite
Date
2022
Authors
Simpson, A.
Glorie, S.
Hand, M.
Spandler, C.
Gilbert, S.
Cave, B.
Editors
Advisors
Journal Title
Journal ISSN
Volume Title
Type:
Journal article
Citation
Geochronology, 2022; 4(1):353-372
Statement of Responsibility
Alexander Simpson, Stijn Glorie, Martin Hand, Carl Spandler, Sarah Gilbert, and Brad Cave
Conference Name
Abstract
The ability to constrain the age of calcite formation is of great utility to the Earth science community, due to the ubiquity of calcite across a wide spectrum of geological systems. Here, we present the first in situ laser ablation inductively coupled tandem quadrupole mass spectrometry (LA-ICP-MS/MS) Lu–Hf ages for calcite, demonstrating geologically meaningful ages for iron oxide copper gold (IOCG) and skarn mineralisation, carbonatite intrusion, and low-grade metamorphism. The analysed samples range in age between ca. 0.9 and ca. 2 Ga with uncertainties between 1.7 % and 0.6 % obtained from calcite with Lu concentrations as low as ca. 0.5 ppm. The Lu–Hf system in calcite appears to be able to preserve primary precipitation ages over a significant amount of geological time, although further research is required to constrain the closure temperature. The in situ approach allows calcite to be rapidly dated while maintaining its petrogenetic context with mineralisation and other associated mineral processes. Therefore, LA-ICP-MS/MS Lu–Hf dating of calcite can be used to resolve the timing of complex mineral paragenetic sequences that are a feature of many ancient rock systems.
School/Discipline
Dissertation Note
Provenance
Description
Published: 8 June 2022
Access Status
Rights
© Author(s) 2022. This work is distributed under the Creative Commons Attribution 4.0 License.