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The Zemaiciu Naumiestis granitoids: new evidences for Mesoproterozoic magmatism in western Lithuania

Motuza, Gediminas ; Cecys, Audrius LU ; Kotov, Aleksander B. and Salnikova, Ekaterina B. (2006) In GFF 128(Part 3). p.243-254
Abstract
We report new occurrences of ca. 1460 Ma magmatism in western Lithuania, where large volumes of granitoid melts were intruded into host supracrustal and charnockitoid rocks, and formed the Zemaiciu Naumiestis pluton. Numerous granitoids of that age have previously been described from southern Sweden and from the Danish island of Bornholm, but none have been reported from the eastern side of the Baltic Sea, where the crystalline basement is covered by Phanerozoic sediments. Petrological studies demonstrate that the Zemaiciu Naumiestis intrusion consists of quartz monzodiorites, monzogranites and syenogranites. The dominant ferromagnesian mineral is biotite. Rare clinopyroxene grains occur in the quartz monzodiorites. The rocks are fine to... (More)
We report new occurrences of ca. 1460 Ma magmatism in western Lithuania, where large volumes of granitoid melts were intruded into host supracrustal and charnockitoid rocks, and formed the Zemaiciu Naumiestis pluton. Numerous granitoids of that age have previously been described from southern Sweden and from the Danish island of Bornholm, but none have been reported from the eastern side of the Baltic Sea, where the crystalline basement is covered by Phanerozoic sediments. Petrological studies demonstrate that the Zemaiciu Naumiestis intrusion consists of quartz monzodiorites, monzogranites and syenogranites. The dominant ferromagnesian mineral is biotite. Rare clinopyroxene grains occur in the quartz monzodiorites. The rocks are fine to coarse-grained, often porphyritic. Chemically, the studied granitoids are dominantly alkali-calcic and shoshonitic, metaluminous to peraluminous, and ferroan to magnesian. The geochemical data indicate that the pluton consists of two rock suites, one representing monzodiorites and monzogranites, and other mostly syenogranites. The suites originated from slightly different sources. The rocks within the Zemaiciu Naumiestis pluton are variably deformed and locally cataclased. Some are, however, rather massive. Two samples of monzogranite yielded ID-TIMS U-Pb zircon ages of 1462 +/- 8 (MSWD = 1.09) and 1459 +/- 3 Ma (MSWD = 0.28). (Less)
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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
U-Pb, zircon, western Lithuania, shoshonitic, A-type, granitoids, Mesoproterozoic, EEC
in
GFF
volume
128
issue
Part 3
pages
243 - 254
publisher
Taylor & Francis
external identifiers
  • wos:000241830800004
  • scopus:33750574971
ISSN
2000-0863
language
English
LU publication?
yes
id
12dc9296-cfca-4752-979a-72a3940c60e8 (old id 378433)
date added to LUP
2016-04-01 11:37:56
date last changed
2021-08-18 01:21:24
@article{12dc9296-cfca-4752-979a-72a3940c60e8,
  abstract     = {We report new occurrences of ca. 1460 Ma magmatism in western Lithuania, where large volumes of granitoid melts were intruded into host supracrustal and charnockitoid rocks, and formed the Zemaiciu Naumiestis pluton. Numerous granitoids of that age have previously been described from southern Sweden and from the Danish island of Bornholm, but none have been reported from the eastern side of the Baltic Sea, where the crystalline basement is covered by Phanerozoic sediments. Petrological studies demonstrate that the Zemaiciu Naumiestis intrusion consists of quartz monzodiorites, monzogranites and syenogranites. The dominant ferromagnesian mineral is biotite. Rare clinopyroxene grains occur in the quartz monzodiorites. The rocks are fine to coarse-grained, often porphyritic. Chemically, the studied granitoids are dominantly alkali-calcic and shoshonitic, metaluminous to peraluminous, and ferroan to magnesian. The geochemical data indicate that the pluton consists of two rock suites, one representing monzodiorites and monzogranites, and other mostly syenogranites. The suites originated from slightly different sources. The rocks within the Zemaiciu Naumiestis pluton are variably deformed and locally cataclased. Some are, however, rather massive. Two samples of monzogranite yielded ID-TIMS U-Pb zircon ages of 1462 +/- 8 (MSWD = 1.09) and 1459 +/- 3 Ma (MSWD = 0.28).},
  author       = {Motuza, Gediminas and Cecys, Audrius and Kotov, Aleksander B. and Salnikova, Ekaterina B.},
  issn         = {2000-0863},
  language     = {eng},
  number       = {Part 3},
  pages        = {243--254},
  publisher    = {Taylor & Francis},
  series       = {GFF},
  title        = {The Zemaiciu Naumiestis granitoids: new evidences for Mesoproterozoic magmatism in western Lithuania},
  volume       = {128},
  year         = {2006},
}