Sm-Nd dating of Seve eclogites, Norrbotten, Sweden ? Evidence for early Caledonian (505 Ma) subduction

Mørk, Mai Britt E.; Kullerud, Kåre; Stabel, A.

doi:10.1007/bf00375366

Cited by 124 publications

(72 citation statements)

References 26 publications

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“…In Norrbotten, a 505-Ma eclogite Sm-Nd age (Mørk et al 1988), partially supported by other geochronological evidence, provided the basis for the correlation of this high-pressure event with the 'Finnmarkian orogenic phase' postulated for the Kalak Nappe Complex (Sturt et al 1978). The Finnmarkian was thought to represent Early Caledonian collisional events that caused obduction of the Baltic margin onto the continent.…”

Section: Introductionmentioning

confidence: 92%

“…Using modern methods, without the limitation of minimum pressure, Albrecht (2000) reported values of 650-720°C and 18.9-27.5 kb. Mørk et al (1988) reported a two-point (garnet ? omphacite) Sm-Nd age of 503 ± 14 Ma from an eclogite sample in the Juron Quartzite (Fig.…”

Section: Vaimok Lensmentioning

confidence: 98%

“…Gray stars U-Pb samples from this study. Diamonds Sm-Nd ages from Mørk et al (1988). Place names in text are as follows: G Grapesvare, R Råvvejaure, Sk Sarek Mtns TS2 with one garnet and two whole-rock analyses from two other Tsäkkok eclogites.…”

Section: Tsäkkok Lensmentioning

confidence: 99%

“…This boudin lies along strike, ca. 1 km west, of the 505 Ma Sm-Nd eclogite locality of Mørk et al (1988). The sample consists predominantly of porphyroblasts of omphacitic clinopyroxene (50%) and garnet (25%), with lesser quartz, zoisite, and phengite (Fig.…”

Section: Tsa¨kkok Eclogite [R05726a]mentioning

confidence: 99%

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U–Pb geochronology of two discrete Ordovician high-pressure metamorphic events in the Seve Nappe Complex, Scandinavian Caledonides

Root

Corfú

2011

Contrib Mineral Petrol

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Section: Introductionmentioning

confidence: 92%

Section: Vaimok Lensmentioning

confidence: 98%

Section: Tsäkkok Lensmentioning

confidence: 99%

Section: Tsa¨kkok Eclogite [R05726a]mentioning

confidence: 99%

See 2 more Smart Citations

U–Pb geochronology of two discrete Ordovician high-pressure metamorphic events in the Seve Nappe Complex, Scandinavian Caledonides

Root

Corfú

2011

Contrib Mineral Petrol

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“…Geochronolgieal studies give an age of formation of ~ 500 Ma for the high-pressure metamorphic rocks in the Seve Nappe Complex (MORK et al, 1988).…”

Section: Transformation Parametersmentioning

confidence: 99%

The clinopyroxene/plagioclase symplectite in retrograde eclogites: A potential geothermobarometer

1991

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⁴⁰Ar/³⁹ Ar geochronological constraints on timing of deformation and metamorphism of the Central Norrbotten Caledonides, Sweden

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1992

Geological Journal

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MA 02 7 39, USA 40Ar/3'Ar geothermochronology is especially useful within the Scandinavian Caledonides, which experienced deformation and metamorphism as a result of two major tectonothermal pulses during the Early and Middle Palaeozoic. This detailed 40Ari'9Ar geochronological study of the Central Norrbotten Caledonides allows examination of the timing of tectonothermal activity within the Lower Koli Nappe, the Seve-Koli shear zone, the Seve Nappe and the shear zone rocks of the Middle Allochthon. The results obtained from a suite of 19 samples from the study area can be incorporated with structural and metamorphic constraints to establish the geological history of the region. Results from this study include: (1) the high grade metamorphism and associated deformation of the Seve units was a Late Cambrian to Early Ordovician event (Finnmarkian) in which the rocks cooled below the respective closure temperatures for hornblende at =490Ma and muscovite at =454Ma: (2) assuming a simple linear cooling model a cooling rate of 3--6"C/Ma was obtained for the older tectonothermal event; (3) there is evidence for late stage Finnmarkian (450 Ma), relatively high grade shear zones separating different tectonostratigraphic elements within the Seve; (4) the Scandian phase of deformation and metamorphism partially reset some of the Seve hornblendes and most of the muscovites, which indicates that the rocks affected by the Finnmarkian event felt a second tectonothermal pulse of more than 350°C beginning at = 430Ma; and ( 5 ) during the Scandian event all of the far travelled allochthonous tectonic units were juxtaposed and the Middle Allochthon mylonites were formed as these nappes were emplaced above the Baltic Shield. The tectonic units of the Singis-Nikkaluokta transect were assembled before regional cooling through the closure temperature of muscovite.

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Sm-Nd dating of Seve eclogites, Norrbotten, Sweden ? Evidence for early Caledonian (505 Ma) subduction

Cited by 124 publications

References 26 publications

U–Pb geochronology of two discrete Ordovician high-pressure metamorphic events in the Seve Nappe Complex, Scandinavian Caledonides

U–Pb geochronology of two discrete Ordovician high-pressure metamorphic events in the Seve Nappe Complex, Scandinavian Caledonides

The clinopyroxene/plagioclase symplectite in retrograde eclogites: A potential geothermobarometer

⁴⁰Ar/³⁹ Ar geochronological constraints on timing of deformation and metamorphism of the Central Norrbotten Caledonides, Sweden

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Sm-Nd dating of Seve eclogites, Norrbotten, Sweden ? Evidence for early Caledonian (505 Ma) subduction

Cited by 124 publications

References 26 publications

U–Pb geochronology of two discrete Ordovician high-pressure metamorphic events in the Seve Nappe Complex, Scandinavian Caledonides

U–Pb geochronology of two discrete Ordovician high-pressure metamorphic events in the Seve Nappe Complex, Scandinavian Caledonides

The clinopyroxene/plagioclase symplectite in retrograde eclogites: A potential geothermobarometer

40Ar/39 Ar geochronological constraints on timing of deformation and metamorphism of the Central Norrbotten Caledonides, Sweden

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⁴⁰Ar/³⁹ Ar geochronological constraints on timing of deformation and metamorphism of the Central Norrbotten Caledonides, Sweden