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Metamorphic rates in collisional orogeny from in situ allanite and monazite dating

2009; Geological Society of America; Volume: 37; Issue: 1 Linguagem: Inglês

10.1130/g25192a.1

1943-2682

Émilie Janots, Martin Engi, Daniela Rubatto, A. Berger, Courtney J. Gregory, Meinert Rahn,

High-pressure geophysics and materials

Research Article| January 01, 2009 Metamorphic rates in collisional orogeny from in situ allanite and monazite dating Emilie Janots; Emilie Janots 1Institut für Geologie, Universität Bern, Blatzerstrasse 3, CH-3012 Bern, Switzerland *Current address: Institut für Mineralogie, WWU Münster, Corrensstrasse 24, 48149 Münster, Germany Search for other works by this author on: GSW Google Scholar Martin Engi; Martin Engi 1Institut für Geologie, Universität Bern, Blatzerstrasse 3, CH-3012 Bern, Switzerland Search for other works by this author on: GSW Google Scholar Daniela Rubatto; Daniela Rubatto 2Research School of Earth Sciences, The Australian National University, Canberra ACT 0200, Australia Search for other works by this author on: GSW Google Scholar Alfons Berger; Alfons Berger 1Institut für Geologie, Universität Bern, Blatzerstrasse 3, CH-3012 Bern, Switzerland Search for other works by this author on: GSW Google Scholar Courtney Gregory; Courtney Gregory 2Research School of Earth Sciences, The Australian National University, Canberra ACT 0200, Australia Search for other works by this author on: GSW Google Scholar Meinert Rahn Meinert Rahn 3Hauptabteilung für die Sicherheit der Kernanlagen (HSK), CH-5232 Villingen, Switzerland Search for other works by this author on: GSW Google Scholar Geology (2009) 37 (1): 11–14. https://doi.org/10.1130/G25192A.1 Article history received: 26 May 2008 rev-recd: 03 Sep 2008 accepted: 04 Sep 2008 first online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Emilie Janots, Martin Engi, Daniela Rubatto, Alfons Berger, Courtney Gregory, Meinert Rahn; Metamorphic rates in collisional orogeny from in situ allanite and monazite dating. Geology 2009;; 37 (1): 11–14. doi: https://doi.org/10.1130/G25192A.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract The prograde sequence of rare earth minerals recorded in metapelites during regional metamorphism reveals a series of irreversible reactions among silicates and phosphates. In individual samples from the northern Lepontine (Central Alps), allanite is partly replaced by monazite at 560–580 °C. Relic allanite retains its characteristic growth zoning acquired at greenschist facies conditions (430–450 °C). Coexisting monazite and allanite were dated in situ to delimit in time successive stages of the Barrovian metamorphism. In situ sensitive high-resolution ion microprobe (SHRIMP) U-Th-Pb dating of allanite (31.5 ± 1.3 and 29.2 ± 1.0 Ma) and monazite (18.0 ± 0.3 and 19.1 ± 0.3 Ma) constrains the time elapsed between 430–450 °C and 560–580 °C, which implies an average heating rate of 8–15 °C/m.y. Combined with new fission track ages (zircon, 10–9 Ma; apatite, 7.5–6.5 Ma), metamorphic rates of the entire orogenic cycle, from prograde to final cooling, can be reconstructed. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.