scholarly journals First direct age determinationfor the Kelseaa Dolerite Dyke, Bornholm, Denmark

2005 ◽  
Vol 52 ◽  
pp. 1-6 ◽  
Author(s):  
Paul M. Holm ◽  
L.E. Pedersen ◽  
L.M. Heaman
Keyword(s):  
Baltic Shield ◽  
Geochronological Data ◽  
Mafic Dykes ◽  
Dolerite Dyke ◽  
Southwestern Margin ◽  
Dyke Injection ◽  
The Baltic

The Danish island Bornholm on the southwestern margin of the Baltic Shield was subject to dyke injection during the Proterozoic. The dykes probably result from several magmatic events. We present U-Pb geochronological data for the largest of the dykes, the tholeiitic Kelseaa dyke. The resulting age, 1326 ±10 (2σ) Ma, places the dyke significantly earlier in the Proterozoic than previously assumed. No other dykes of this age have been reported from the western part of the Baltic Shield. The NE–SW strike of the Kelseaa dyke is evidence for extension oblique to the border of the Baltic Shield.The Kelseaa dyke is the first evidence for this event that was subsequent to the emplacement of theBornholm and Karlshamn (SE Sweden) granites and prior to the intrusion of the Central Scandinavian Dolerite Group, and possibly also the majority of mafic dykes on Bornholm.

scholarly journals FORMATION OF THE KHEDOZEROBOLSHOZERSKAYA STRUCTURE OF THE BALTIC SHIELD IN THE LIGHT OF NEW GEOCHEMICAL AND GEOCHRONOLOGICAL DATA

2019 ◽  
pp. 5
Author(s):  
Татьяна Анатольевна Мыскова ◽  
Tatiana Myskova ◽  
Павел Алексеевич Львов ◽  
Pavel Lvov
Keyword(s):  
Baltic Shield ◽  
Geochronological Data ◽  
The Baltic

Tracing the SW border of the Svecofennian Domain in the Baltic Sea region: evidence from petrology and geochronology from a granodioritic migmatite

2021 ◽  
Author(s):  
Evgenia Salin ◽  
Jeremy Woodard ◽  
Krister Sundblad
Keyword(s):  
Baltic Sea ◽  
Short Distance ◽  
Sedimentary Cover ◽  
Crystalline Basement ◽  
Drill Core ◽  
The Baltic Sea ◽  
Baltic Sea Region ◽  
Drill Site ◽  
Southwestern Margin ◽  
The Baltic

AbstractGeological investigations of a part of the crystalline basement in the Baltic Sea have been performed on a drill core collected from the depth of 1092–1093 m beneath the Phanerozoic sedimentary cover offshore the Latvian/Lithuanian border. The sample was analyzed for geochemistry and dated with the SIMS U–Pb zircon method. Inherited zircon cores from this migmatized granodioritic orthogneiss have an age of 1854 ± 15 Ma. Its chemical composition and age are correlated with the oldest generation of granitoids of the Transscandinavian Igneous Belt (TIB), which occur along the southwestern margin of the Svecofennian Domain in the Fennoscandian Shield and beneath the Phanerozoic sedimentary cover on southern Gotland and in northwestern Lithuania. It is suggested that the southwestern border of the Svecofennian Domain is located at a short distance to the SW of the investigated drill site. The majority of the zircon population shows that migmatization occurred at 1812 ± 5 Ma, with possible evidence of disturbance during the Sveconorwegian orogeny.

Eclogites in the central part of the Sveconorwegian Eastern Segment of the Baltic Shield: Support for an extensive eclogite terrane

GFF ◽  
2005 ◽  
Vol 127 (3) ◽  
pp. 221-232 ◽  
Author(s):  
Eric Austin Hegardt ◽  
David Cornell ◽  
Lillemor Claesson ◽  
Sergei Simakov ◽  
Holly Stein ◽  
...  
Keyword(s):  
Baltic Shield ◽  
Eastern Segment ◽  
The Baltic
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