1. Department of Geosciences and Geography University of Helsinki Helsinki 00014, Finland
2. Department of Geology Lund University Sölvegatan 12 Lund 223 62, Sweden
3. Geological Survey of Denmark and Greenland C.F. Møllers Allé 8 Aarhus DK‐8000, Denmark
4. Laboratory of Ion Beam Physics ETH Zürich Schafmattstrasse 20 Zürich CH‐8093, Switzerland
5. Department of Earth Resource Science Akita University Tegatagakuen‐machi Akita 010‐8502, Japan
6. LSCE CNRS Université Paris Saclay Paris France
7. A.P. Karpinsky Russian Geological Research Institute Sredny pr. 74 Saint Petersburg 199106, Russia
8. Montclair State University 1 Normal Ave. Montclair NJ 07043, USA
9. Uppsala University Villavägen 16 Uppsala 75236 Sweden
10. University of Hawai'i at Mānoa Honolulu HI, USA
11. Södertörn University Alfred Nobels Allé 7 Flemingsberg Sweden
12. Geological Survey of Finland Vuorimiehentie 5 Espoo FI‐02151 Finland