Articles | Volume 36, issue 3
https://doi.org/10.5194/ejm-36-433-2024
https://doi.org/10.5194/ejm-36-433-2024
Research article
 | 
03 Jun 2024
Research article |  | 03 Jun 2024

First in situ Lu–Hf garnet date for a lithium–caesium–tantalum (LCT) pegmatite from the Kietyönmäki Li deposit, Somero–Tammela pegmatite region, SW Finland

Krisztián Szentpéteri, Kathryn Cutts, Stijn Glorie, Hugh O'Brien, Sari Lukkari, Radoslaw M. Michallik, and Alan Butcher

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Cited articles

Aurola, E.: On the pegmatites in the Torro Area, Southwestern Finland, Bulletin de la Commission Geologique de Finlande, No. 206, 35 pp., https://tupa.gtk.fi/julkaisu/bulletin/bt_206.pdf (last access: 28 May 2024), 1963. 
Alviola, R.: The granitic pegmatites of the Somero-Tammela area, in: Symposium Precambrian granitoids. Petrogenesis, geochemistry and metallogeny, 14–17 August 1989, Helsinki, Finland, Excursion C1: Late orogenic and synorogenic Svecofennian granitoids and associated pegmatites of southern Finland. Geol. Surv. Finl, Guidb., 26, 16–25, https://tupa.gtk.fi/julkaisu/opas/op_026.pdf (last access: 28 May 2024), 1989. 
Alviola, R.: Tutkimustyöselostus Tammelan kunnassa, valtausalueella Kietyönmäki 1, kaiv. rek, No. 3991/1, suoritetuista teollisuusmineraalitutkimuksista, Geol. Surv. Finl., Rep., no. M06/2024/-93/1/85, 7 pp., 1993 (in Finnish). 
Alviola, R.: Pegmatiittien malmipotentiaalista Suomessa, Geol. Surv. Finl, Rep., no.: M10/03/1/85, 5 pp., 2003 (in Finnish). 
Alviola, R., Mänttäri, I., Mäkitie, H., and Vaasjoki, M.: Svecofennian rare.element granitic pegmatites of the ostrobothnia region, western finland; their metamorphic environment and time of intrusion, in: Svecofennian granitic pegmatites (1.86–1.79 Ga) and quartz monzonite (1.87 Ga), and their metamorphic environment in the Seinäjoki region, western Finland, edited by: Mäkiite, H., Geol. Surv. Finl. Special Paper, 30, 9–29, 2001. 
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Short summary
In situ Lu–Hf geochronology of garnet is applied to date a Finnish lithium–caesium–tantalum (LCT) pegmatite from the Somero–Tammela pegmatite region. The age obtained was 1801 ± 53 Ma, which is consistent with zircon ages of 1815–1740 Ma obtained from the same pegmatite. We show the in situ Lu–Hf method is a fast way of obtaining reliable age dates from LCT pegmatites.