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Early Mesoproterozoic magmatism in northwestern Lithuania: a new U-Pb zircon dating

Vejelyte, Irma; Bogdanova, Svetlana LU and Skridlaite, Grazina (2015) In Estonian Journal of Earth Sciences 64(3). p.189-198
Abstract
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 Pb-207/Pb-206 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... (More)
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 Pb-207/Pb-206 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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
U-Pb zircon dating, LA-ICP-MS, granodiorite, Lithuania, East European, Craton
in
Estonian Journal of Earth Sciences
volume
64
issue
3
pages
189 - 198
publisher
Estonian Academy Publishers
external identifiers
  • wos:000360713500001
  • scopus:84939128113
ISSN
1736-7557
DOI
10.3176/earth.2015.26
language
English
LU publication?
yes
id
7545e084-eb44-4d7b-a1b7-4de7a2e64dd7 (old id 8080594)
date added to LUP
2015-10-22 16:27:19
date last changed
2017-01-01 03:20:30
@article{7545e084-eb44-4d7b-a1b7-4de7a2e64dd7,
  abstract     = {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 Pb-207/Pb-206 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.},
  author       = {Vejelyte, Irma and Bogdanova, Svetlana and Skridlaite, Grazina},
  issn         = {1736-7557},
  keyword      = {U-Pb zircon dating,LA-ICP-MS,granodiorite,Lithuania,East European,Craton},
  language     = {eng},
  number       = {3},
  pages        = {189--198},
  publisher    = {Estonian Academy Publishers},
  series       = {Estonian Journal of Earth Sciences},
  title        = {Early Mesoproterozoic magmatism in northwestern Lithuania: a new U-Pb zircon dating},
  url          = {http://dx.doi.org/10.3176/earth.2015.26},
  volume       = {64},
  year         = {2015},
}