Preview

PDF Not available 986Kb

We present new geochronological evidence of latest Palaeoproterozoic–earliest Mesoproterozoic magmatism in the Telsiai Deformation Zone, NW Lithuania. Employing the laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) at the University of Tasmania, Australia, we demonstrate that a granodiorite, which had previously been considered to belong to the 1850–1820 Ma Kursiai charnockitic batholith, has a U–Pb zircon age of ca 1.62 Ga. The weighted mean Pb²⁰⁷/Pb²⁰⁶ age obtained from eight concordant zircon grains is 1625 ± 6 Ma (MSWD = 0.6), while the upper-intercept concordia age is 1619 ± 27 Ma (MSWD = 0.56). Like similar ages of granitoids from several small intrusions in Estonia, this once more indicates extensive melting of the crust at that time. We suggest that both the 1.62 Ga magmatism and the emplacement and crystallization of the large Riga anorthosite–mangerite–charnockite–rapakivi batholith in Latvia and western Estonia at 1580 Ma were far-field feedback effects of the formation of the new Palaeoproterozoic continental crust during the Gothian orogeny at the present SW margin of the East European Craton.

Item Type:	Refereed Article
Keywords:	U-Pb zircon dating, LA-ICP-MS, granodiorite, Lithuania, East European Craton
Research Division:	Earth Sciences
Research Group:	Geology
Research Field:	Geochronology
Objective Division:	Expanding Knowledge
Objective Group:	Expanding Knowledge
Objective Field:	Expanding Knowledge in the Earth Sciences
UTAS Author:	Vejelyte, I (Ms Irma Vejelyte)
ID Code:	103419
Year Published:	2015
Deposited By:	Centre for Ore Deposit Research - CODES CoE
Deposited On:	2015-10-08
Last Modified:	2016-05-24
Downloads:	0