Articles | Volume 4, issue 2
Geochronology, 4, 471–500, 2022
https://doi.org/10.5194/gchron-4-471-2022
Geochronology, 4, 471–500, 2022
https://doi.org/10.5194/gchron-4-471-2022
Research article
20 Jul 2022
Research article | 20 Jul 2022

Complex 40Ar ∕ 39Ar age spectra from low-grade metamorphic rocks: resolving the input of detrital and metamorphic components in a case study from the Delamerian Orogen

Anthony Reid et al.

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Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on gchron-2021-41', Anonymous Referee #1, 21 Jan 2022
    • AC1: 'Reply on RC1', Anthony Reid, 09 Mar 2022
    • AC2: 'Reply on RC1', Anthony Reid, 10 Mar 2022
  • RC2: 'Comment on gchron-2021-41', Jörg Pfänder, 23 Jan 2022
    • AC3: 'Reply on RC2', Anthony Reid, 10 Mar 2022
  • EC1: 'Comment on gchron-2021-41', Klaus Mezger, 07 Mar 2022
    • AC4: 'Reply on EC1', Anthony Reid, 10 Mar 2022
  • EC2: 'Comment on gchron-2021-41', Klaus Mezger, 14 Mar 2022

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision
ED: Publish subject to revisions (further review by editor and referees) (22 Mar 2022) by Klaus Mezger
AR by Anthony Reid on behalf of the Authors (27 May 2022)  Author's response    Author's tracked changes
ED: Publish as is (07 Jun 2022) by Klaus Mezger
ED: Publish as is (09 Jun 2022) by Andreas Lang(Editor)
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Short summary
Dating low-grade metamorphic rocks with the 40Ar / 39Ar method is difficult because samples are fine-grained mixtures between detrital and newly grown metamorphic minerals. We use a careful step-heating schedule and resolve limits within the complex age spectra thus derived to infer the timing of metamorphism and deformation in the Delamerian Orogen (formerly part of eastern Gondwana). Results suggest detrital mineral from up to 1172 Ma and that metamorphic minerals grew at 470–458 Ma.