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Structural and U-Pb isotopic age constraints on the tectonothermal evolution at Glassvik, Halland

Söderlund, Ulf (1993) In Dissertations in Geology at Lund University
Department of Geology
Abstract
The topic of this paper include an attempt to interpret the mutually timing of
the tectonothermal events at Glassvik, considered to constitute a key locality
in the southern part of the Southwestern Granulite Province (SGP). The
province is characterized by numerous occurrences of mafic granulites and
charnockites as well as high-grade gneisses of a polymetamorphic origin.
Three different distinguishable types of granitic dykes and segregates have
been studied. A thick pegmatitic dyke was sampled and dated by the U-Pb
zircon method. The upper intercept age is 1510 Ma and is interpreted as the
intrusion age, while the significance of the lower intercept age of c. 630 Ma
is unclear.
Three planar structures are distinguished by... (More)
The topic of this paper include an attempt to interpret the mutually timing of
the tectonothermal events at Glassvik, considered to constitute a key locality
in the southern part of the Southwestern Granulite Province (SGP). The
province is characterized by numerous occurrences of mafic granulites and
charnockites as well as high-grade gneisses of a polymetamorphic origin.
Three different distinguishable types of granitic dykes and segregates have
been studied. A thick pegmatitic dyke was sampled and dated by the U-Pb
zircon method. The upper intercept age is 1510 Ma and is interpreted as the
intrusion age, while the significance of the lower intercept age of c. 630 Ma
is unclear.
Three planar structures are distinguished by differences in mineralogy,
deformational textures and structural relationships to intrusive pegmatitic
dykes and segregates. The intrusion of the pegmatitic dykes postdates the
formation of the compositional banding (S1) exposed in the amphibolites,
and predates a high-grade event D2. During this event (D2), migmatitic
gneisses were formed and pre-existing fabrics and intrusive dykes were
reworked. Retrogression of the high-grade metamorphic assemblages in
amphibolitic S3-lenses is interpreted to be associated to late or post-Sveconorwegian
uplift. (Less)
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author
Söderlund, Ulf
supervisor
organization
year
type
H1 - Master's Degree (One Year)
subject
keywords
Sveconorwegian, U-Pb zircon, SW Sweden, geochronology, evaporation, pegmatite dyke
publication/series
Dissertations in Geology at Lund University
report number
47
language
English
id
2370181
date added to LUP
2012-08-13 14:11:26
date last changed
2012-08-13 14:28:27
@misc{2370181,
  abstract     = {The topic of this paper include an attempt to interpret the mutually timing of
the tectonothermal events at Glassvik, considered to constitute a key locality
in the southern part of the Southwestern Granulite Province (SGP). The
province is characterized by numerous occurrences of mafic granulites and
charnockites as well as high-grade gneisses of a polymetamorphic origin.
Three different distinguishable types of granitic dykes and segregates have
been studied. A thick pegmatitic dyke was sampled and dated by the U-Pb
zircon method. The upper intercept age is 1510 Ma and is interpreted as the
intrusion age, while the significance of the lower intercept age of c. 630 Ma
is unclear.
Three planar structures are distinguished by differences in mineralogy,
deformational textures and structural relationships to intrusive pegmatitic
dykes and segregates. The intrusion of the pegmatitic dykes postdates the
formation of the compositional banding (S1) exposed in the amphibolites,
and predates a high-grade event D2. During this event (D2), migmatitic
gneisses were formed and pre-existing fabrics and intrusive dykes were
reworked. Retrogression of the high-grade metamorphic assemblages in
amphibolitic S3-lenses is interpreted to be associated to late or post-Sveconorwegian
uplift.},
  author       = {Söderlund, Ulf},
  keyword      = {Sveconorwegian,U-Pb zircon,SW Sweden,geochronology,evaporation,pegmatite dyke},
  language     = {eng},
  note         = {Student Paper},
  series       = {Dissertations in Geology at Lund University},
  title        = {Structural and U-Pb isotopic age constraints on the tectonothermal evolution at Glassvik, Halland},
  year         = {1993},
}