Correction to: Ion microprobe dating of fissure monazite in the Western Alps: insights from the Argentera Massif and the Piemontais and Briançonnais Zones

1 Correction to: Swiss Journal of Geosciences (2020) 113:15 https://doi.org/10.1186/s00015-020-00365-3

Following publication of the original article (Ricchi et al. 2020), multiple typesetting errors were identified in the article. The updated sections/sentences are given below and the changes have been highlighted in bold typeface.

Keywords

²⁰⁸Pb/²³²Th fissure monazite age, Western Alps, High pressure, Argentera Massif, Tectonic activity, Hydrothermal monazite chemistry.

Introduction

In monazite-bearing fissures, quartz and adularia typically form at an early stage of fissure formation (< 500–450 °C), whereas monazite crystallizes at later stages (between 400 and 200 °C) (e.g. Gnos et al. 2015).

Methods

In situ Th–Pb dating of five monazite grains was carried out at the SwissSIMS Ion microprobe facility, equipped with a Cameca IMS 1280 HR instrument, at the University of Lausanne, Switzerland (Table 3).

Since fissure monazite is dissolved and re-precipitated under changing chemical conditions (e.g. Grand’Homme et al. 2018), spot analyses affected by Pb_c (as indicated by older dates related to higher Pb_c, i.e. positive age-f₂₀₈ correlation), or those with high uncertainty (1σ absolute > 1) were removed from the dataset.

Top‑NNW thrusting (> 35 Ma)

The oldest fissure monazite age of the Western Alps is recorded at ~ 36 Ma by BALZI2 grain from the Briançonnais Zone (Figs. 1 and 6) and is interpreted to be related to Late Eocene—earliest Oligocene top-NNW thrusting (episode (1); Table 2) which started at or before 38 Ma (Cardello et al. 2019).

Acknowledgements

We thank Gaspare Maletto, Roberto Bracco and Francis Guichon for providing the samples and valuable information on the sample localities. We also thank Daniel Marty and Paola Manzotti for the editing work as well as Neil Mancktelow and an anonymous reviewer for their helpful comments.

The original article (Ricchi et al. 2020) has been corrected and the Publisher apologises to the authors and the readers for the inconvenience caused by this typesetting error.