Articles | Volume 8, issue 2
https://doi.org/10.5194/gchron-8-313-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gchron-8-313-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Response of the Rb–Sr system in biotite during contact metamorphism in the aureole of the Makhavinekh Lake Pluton, Labrador
Christopher R. M. McFarlane
CORRESPONDING AUTHOR
Department of Earth Sciences, University of New Brunswick, Fredericton, E3B5M5, Canada
Related authors
Marianne Sophie Hollinetz, Benjamin Huet, David A. Schneider, Christopher R. M. McFarlane, Ralf Schuster, Gerd Rantitsch, Philip Schantl, Christoph Iglseder, Martin Reiser, and Bernhard Grasemann
Eur. J. Mineral., 36, 943–983, https://doi.org/10.5194/ejm-36-943-2024, https://doi.org/10.5194/ejm-36-943-2024, 2024
Short summary
Short summary
In situ U–Th–Pb dating of allanite and monazite provides a robust record of polymetamorphism in greenschist facies metapelites in the Austroalpine Unit. Variations in bulk rock Ca, Al and Na contents produced a wide range of REE-mineral-phase relationships and microstructures, making them excellent geochronometers in complex tectonic settings. Our new pressure, temperature, time and deformation data reveal Permian metamorphism and a major crustal-scale Cretaceous detachment.
Marianne Sophie Hollinetz, Benjamin Huet, David A. Schneider, Christopher R. M. McFarlane, Ralf Schuster, Gerd Rantitsch, Philip Schantl, Christoph Iglseder, Martin Reiser, and Bernhard Grasemann
Eur. J. Mineral., 36, 943–983, https://doi.org/10.5194/ejm-36-943-2024, https://doi.org/10.5194/ejm-36-943-2024, 2024
Short summary
Short summary
In situ U–Th–Pb dating of allanite and monazite provides a robust record of polymetamorphism in greenschist facies metapelites in the Austroalpine Unit. Variations in bulk rock Ca, Al and Na contents produced a wide range of REE-mineral-phase relationships and microstructures, making them excellent geochronometers in complex tectonic settings. Our new pressure, temperature, time and deformation data reveal Permian metamorphism and a major crustal-scale Cretaceous detachment.
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Short summary
The mineral biotite is a common rock-forming mineral and notable for its ability to incorporate Rb into its structure. Microanalytical tools such a laser ablation and tandem mass spectrometry, allows Rb-Sr biotite dating with context preserved. This study reveals Sr mobility that is controlled by location in a rock. Reconstructing the timing of geological events using biotite Rb-Sr geochronology is, therefore, contingent on grain-scale evaluation of biotite textures.
The mineral biotite is a common rock-forming mineral and notable for its ability to incorporate...