Transitioning from Svecofennian to Transcandinavian Igneous Belt (TIB) magmatism in SE Sweden: Implications from the 1.82 Ga Eksjö tonalite

Åhäll, Karl‐Inge; Connelly, James N.; Brewer, T. S.

doi:10.1080/11035890201244217

Cited by 23 publications

(9 citation statements)

References 35 publications

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“…This age together with earlier published U-Pb ages of calc-alkaline intrusions (Mansfeld 1996;Åhäll et al 2002) strongly suggests that the OJB was formed during a short time interval between c. 1.83 and 1.82 Ga. Ga formation of a juvenile volcanic arc, southeastern Sweden GFF 127 (2005) Fig. 5.…”

Section: Discussionmentioning

confidence: 57%

1.83—1.82 Ga formation of a juvenile volcanic arc—implications from U—Pb and Sm—Nd analyses of the Oskarshamn-Jönköping Belt, southeastern Sweden

Mansfeld¹,

Beunk

Barling

2005

GFF

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Section: Discussionmentioning

confidence: 57%

1.83—1.82 Ga formation of a juvenile volcanic arc—implications from U—Pb and Sm—Nd analyses of the Oskarshamn-Jönköping Belt, southeastern Sweden

Mansfeld¹,

Beunk

Barling

2005

GFF

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“…1), called the Oskarshamn-Jönköping Belt (OJB; Mansfeld, 1996;Åhäll et al, 2002;Mansfeld et al, 2005). Rock types of the OJB are mainly granodioritic to tonalitic, and the associated volcanites basaltic to dacitic (Wik et al, 2003).…”

Section: The Småland-värmland Belt In Southeast Swedenmentioning

confidence: 98%

Characterization of the Paleoproterozoic Mantle beneath the Fennoscandian Shield: Geochemistry and Isotope Geology (Nd, Sr) of ~ 1.8 Ga Mafic Plutonic Rocks from the Transscandinavian Igneous Belt in Southeast Sweden

Andersson

Rutanen

Johansson

et al. 2007

International Geology Review

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Geochemistry and Sr-Nd isotope geochemistry of ca. 1.8 Ga, mafic intrusions of the Transscandinavian Igneous Belt (TIB-1) in the Fennoscandian shield were studied in southeastern Sweden. These rocks show LILE-LREE-enriched, HFSE-depleted, calc-alkaline, continental arc signatures in the north, grading to slightly less enriched, oceanic affinities southward.ε Nd (1.80) values range from +2.0 to +0.7 and 87 Sr/ 86 Sr(1.80) from 0.7022 to 0.7029 (with one outlier at 0 and 0.7033), without correlation to fractionation (e.g., Mg#) or crustal contamination, indicating sources that are mildly depleted. The most depleted ratios occur in the south, trending with the geochemistry toward more enriched compositions northward. The sources represent depleted mantle wedge material that was subjected to enrichment not long before (T DM ca. 2.0 Ga), i.e., during the preceding arc subduction (2.1-1.82 Ga), and/or during the TIB-1 magmatism itself, by hydrous fluids with a sediment and/or melt input increasing northward. The TIB-1 magmatism occurred above a south(west)ward-retreating subduction zone along the continental margin of the juvenile Svecofennian continent at 1.81-1.76 Ga.ANDERSSON ET AL.

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“…Andersson et al 2007), although age data are currently lacking for mafic rocks in the area. The TIB rocks occur in close spatial association with the OJB, a potential accreted island arc that has been dated at c. 1.83 -1.82 Ga (Å häll et al 2002;Mansfeld et al 2005).…”

Section: Geological Settingmentioning

confidence: 95%

“…The most well-known examples are the Fredriksberg Cu-Zn-Pb sulphide deposit hosted by metavolcanic rocks (Sundblad et al 1997), the Sunnerskog Cu-W-Mo skarn deposit hosted by metagreywacke (Persson 1989), the Ä delfors tectonically related, gold-bearing quartz veins hosted by mafic metavolcanic rocks (Gaál & Sundblad 1990) and minor Ni mineralisations in a layered gabbro in Virserum to the southeast of Kleva (Tegengren 1924). The OJB consists of calcalkaline igneous and supracrustal rocks and is proposed to have formed during subduction of oceanic lithosphere under a continent or mature arc along the active margin of Fennoscandia (Å häll et al 2002;Mansfeld et al 2005). The supracrustal rocks of the Vetlanda area (Röshoff 1975) consist of interlayered sedimentary and volcanic rocks, of which the volcanic rocks make up a large proportion.…”

Section: Geological Settingmentioning

confidence: 98%

Geochronology and geochemical evidence for a magmatic arc setting for the Ni-Cu mineralised 1.79 Ga Kleva gabbro–diorite intrusive complex, southeast Sweden

Bjärnborg

Scherstén

Maier

2015

GFF

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Magmatic Ni-Cu sulphide deposits are commonly associated with mafic rocks within the marginal areas of Archean or Proterozoic cratons. The Kleva Ni-Cu sulphide deposit in southeast Sweden is hosted by gabbro-diorite rocks and is sandwiched between two Palaeoproterozoic magmatic arcs: the Transscandinavian Igneous Belt (TIB) and the Oskarshamn-Jönköping Belt (OJB). Major and trace element data corroborate an arc origin for the Kleva intrusive complex. The variety of rocks and geochemical signatures suggest that it formed from several magmatic pulses. Despite the occurrence of supracrustal xenoliths, there is a lack of trace element evidence for significant assimilation. Mafic intrusions are abundant in southeast Sweden and are generally inferred to be synchronous with the TIB. Of these, Kleva is the only known Ni-Cu deposit, and it is unclear if it is associated with the OJB or TIB. Here, we present zircon and baddeleyite U-Pb dates of 1788^4 Ma, 1788^5 Ma and 1792^3 Ma. We interpret a 1790 Ma date to be the best estimate of the crystallisation age of the Kleva intrusive complex, indicating that the emplacement of mafic magma is coeval with the voluminous arc-related TIB magmatism in the area.

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Transitioning from Svecofennian to Transcandinavian Igneous Belt (TIB) magmatism in SE Sweden: Implications from the 1.82 Ga Eksjö tonalite

Cited by 23 publications

References 35 publications

1.83—1.82 Ga formation of a juvenile volcanic arc—implications from U—Pb and Sm—Nd analyses of the Oskarshamn-Jönköping Belt, southeastern Sweden

1.83—1.82 Ga formation of a juvenile volcanic arc—implications from U—Pb and Sm—Nd analyses of the Oskarshamn-Jönköping Belt, southeastern Sweden

Characterization of the Paleoproterozoic Mantle beneath the Fennoscandian Shield: Geochemistry and Isotope Geology (Nd, Sr) of ~ 1.8 Ga Mafic Plutonic Rocks from the Transscandinavian Igneous Belt in Southeast Sweden

Geochronology and geochemical evidence for a magmatic arc setting for the Ni-Cu mineralised 1.79 Ga Kleva gabbro–diorite intrusive complex, southeast Sweden

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