Ion probe dating of a migmatite in SW Sweden: the fate of zircon in crustal processes

Scherstén, Anders; Larson, Sven Åke; Cornell, David H.; Stigh, Jimmy

doi:10.1016/j.precamres.2003.12.002

Cited by 34 publications

(13 citation statements)

References 61 publications

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“…The Mylonite Zone dips gently west or is subvertical, and accommodated top-to-the-ESE displacement followed by top-to-the-W extension in the late Sveconorwegian (Berglund, 1997;Stephens et al, 1996;Viola et al, 2011). Migmatization in the southern Mylonite Zone took place at 0.98-0.97 Ga , synchronous with high-grade metamorphism in the Eastern Segment (Möller et al, 2007); U-Pb ages of 0.92 Ga (titanite and zircon) record a younger stage of metamorphism and ductile deformation Scherstén et al, 2004). 40 Ar/ 39 Ar cooling ages of the boundary range from 0.92 Ga (hornblende, Page et al, 1996) to 0.88 Ga (biotite and muscovite, Viola et al, 2011).…”

Section: The Sveconorwegian Provincementioning

confidence: 99%

Exhumation of an eclogite terrane as a hot migmatitic nappe, Sveconorwegian orogen

Möller

Andersson

Dyck

et al. 2015

Lithos

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We demonstrate a case of eclogite exhumation in a partially molten, low-viscosity fold nappe within high-grade metamorphosed crust in the Eastern Segment of the Sveconorwegian orogen. The nappe formed during tectonic extrusion, melt-weakening assisted exhumation and foreland-directed translation of eclogitized crust, and stalled at 35-40 km depth within the collisional belt. The eclogites are structurally restricted to a regional recumbent fold in which stromatic orthogneiss with pods of amphibolitized eclogite make up the core. Hightemperature mylonitic gneiss with remnants of kyanite eclogite (P N 15 kbar) composes a basal shear zone 50 km long and b 4 km wide. Heterogeneously sheared and partly migmatized augen gneiss forms a tectonostratigraphic marker in front of and beneath the nappe, and is in turn structurally enveloped by a composite sequence of orthogneisses and metabasites. The entire tectonostratigraphic pile underwent near-pervasive deformation and recrystallization under high-pressure granulite and upper amphibolite conditions. U-Pb SIMS metamorphic zircon ages of eclogite and stromatic orthogneiss constrain the time of eclogitization at 988 ± 6 Ma and 978 ± 7 Ma. Migmatization, concomitant deformation, and exhumation are dated at 976 ± 6 Ma, and crystallization of post-kinematic melt at 956 ± 7 Ma. Orthogneiss protoliths are dated at 1733 ± 11 and 1677 ± 10 Ma (stromatic gneiss) and 1388 ± 7 Ma (augen gneiss in footwall), demonstrating origins indigenous to the Eastern Segment. Eclogitization and exhumation were coeval with the Rigolet phase of the Grenvillian orogeny, reflecting the late stage of continental collision during construction of the supercontinent Rodinia.

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Section: The Sveconorwegian Provincementioning

confidence: 99%

Exhumation of an eclogite terrane as a hot migmatitic nappe, Sveconorwegian orogen

Möller

Andersson

Dyck

et al. 2015

Lithos

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“…In high-grade metamorphic rocks, fluid availability plays a critical role in dictating zircon growth or overgrowth (Rubatto et al, 1999;Ayers et al, 2002;Corfu et al, 2003;Schersten et al, 2004;Zheng et al, 2004Zheng et al, , 2005a. For the Dabie-Sulu UHP metamorphic rocks, the SHRIMP zircon U-Pb dating for coesite-bearing domains reveals episodic growth of metamorphic zircons at 242 ± 2 Ma and 227 ± 2 Ma (Fig.…”

Section: Timing Of Metamorphic Zircon Growthmentioning

confidence: 99%

U–Pb, Hf and O isotope evidence for two episodes of fluid-assisted zircon growth in marble-hosted eclogites from the Dabie orogen

Zheng

Zhao

et al. 2006

Geochimica et Cosmochimica Acta

276

137

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“…The young granulite facies event in the Hardangervidda-Rogaland block reflects contact metamorphism related to the Ga emplacement of the 0.95-0.92 Rogaland Intrusive Complex, which overprints an older granulite-facies paragenesis (Schärer et al 1996;Möller et al 2002;). 1.08-1.07 Ga amphibolite-facies metamorphism has also been recorded in the northern part of the Kongsberg-Marstrand block (Munz et al 1994;Ali 2000), whereas the southern part of the Randsfjord-Lygnern block shows an amphibolite-facies event at 1.03-1.01 Ga Scherstén et al 2004); the age of metamorphism in the northern part of that block is unknown. In the Vänern-Halmstad block, Sveconorwegian metamorphism to the granulite, eclogite and amphibolite facies at 0.97-0.98 Ga P.…”

Section: Timing Of Petrogenetic Eventsmentioning

confidence: 96%

Terrane analysis, regional nomenclature and crustal evolution in the Southwest Scandinavian Domain of the Fennoscandian Shield

Andersen¹

2005

GFF

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Tectonostratigraphic terrane analysis of an orogenic belt involves the use of a well-defined nomenclature which is related to the internal structure and relative displacement of blocks in the orogenic "puzzle". The tectonostratigraphic terrane is the central concept in terrane analysis, and the term should be restricted to units fulfilling the definition, i.e. to fault-bounded crustal blocks which have distinct lithologic and stratigraphic successions and which have geologic histories different from neighbouring terranes. Application of terrane analysis to a complex, poly-orogenic region such as the Southwest Scandinavian Domain of the Fennoscandian Shield (SSD) must include information on the entire crustal evolution history of potential terranes, including petrological, geochemical and other non-geochronological information. At the present state of knowledge, no crustal block within the SSD fulfil the criteria as a Gothian or Sveconorwegian tectonostratigraphic terrane. Until basic evidence of terrane status is established for a given block of crust, the use of a descriptive regional nomenclature is therefore preferred. A revised, non-genetic nomenclature is proposed, which does not assign terrane status to any of its units, and which will hopefully help eliminating confusing differences in usage, and be helpful in future analysis of Gothian and Sveconorwegian tectonics and crustal evolution in the region. To reach a stage where terrane analysis of the Gothian and Sveconorwegian evolution of the SSD becomes meaningful, it is necessary to carry out both structural studies and isotopic dating of the ductile deformation zones which are potential terrane boundaries.

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Ion probe dating of a migmatite in SW Sweden: the fate of zircon in crustal processes

Cited by 34 publications

References 61 publications

Exhumation of an eclogite terrane as a hot migmatitic nappe, Sveconorwegian orogen

Exhumation of an eclogite terrane as a hot migmatitic nappe, Sveconorwegian orogen

U–Pb, Hf and O isotope evidence for two episodes of fluid-assisted zircon growth in marble-hosted eclogites from the Dabie orogen

Terrane analysis, regional nomenclature and crustal evolution in the Southwest Scandinavian Domain of the Fennoscandian Shield

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