Evolution of a Palaeoproterozoic giant magmatic dome in the Finnish Svecofennian; New insights from U–Pb geochronology

Kotilainen, Anna; Mänttäri, Irmeli; Kurhila, Matti; Hölttä, Pentti; Rämö, O. Tapani

doi:10.1016/j.precamres.2015.10.023

Cited by 10 publications

(25 citation statements)

References 52 publications

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“…The maximum sedimentation age of the xenoliths from the Vaasa batholith is ≤ 1.92 Ga (Kotilainen et al, 2016) and is equivalent to the ≤ 1.92-1.91 Ga maximum sedimentation age of the adjacent Bothnian Belt (Lahtinen et al, 2002). Detrital zircon age patterns of the xenoliths in the Vaasa batholith (Kotilainen et al, 2016) are similar to the patterns of previously dated detrital zircon from Svecofennian metasedimentary rocks (cf. Huhma et al, 1991;Claesson et al, 1993;Lahtinen et al, 2002Lahtinen et al, , 2009Rutland et al, 2004;Bergman et al, 2008).…”

Section: Geologic Settingsupporting

confidence: 72%

“…The monazite samples are from granitoid-xenolith pairs collected from the main body of Vaasa batholith for U-Pb zircon dating (Kotilainen et al, 2016). From the nine sample pairs collected, six granitoids and two xenoliths had sufficient amount of monazite for U-Pb analysis.…”

Section: Samples and Analytical Methodsmentioning

confidence: 99%

“…1 and monazite descriptions are in Table 1. For lithologic photographs and petrographic descriptions, see Kotilainen et al (2016). Approximately 1-3 kg of each sample was crushed in a jaw crusher and foreign material was removed from the crushed material.…”

Section: Samples and Analytical Methodsmentioning

confidence: 99%

“…The granitoids of the Vaasa batholith are peraluminous and were crystallized at 1.88-1.86 Ga according to U-Pb zircon ages thus far published (e.g., Sipilä et al, 2008;Suikkanen et al, 2014;Kotilainen et al, 2016). The maximum sedimentation age of the xenoliths from the Vaasa batholith is ≤ 1.92 Ga (Kotilainen et al, 2016) and is equivalent to the ≤ 1.92-1.91 Ga maximum sedimentation age of the adjacent Bothnian Belt (Lahtinen et al, 2002).…”

Section: Geologic Settingmentioning

confidence: 97%

“…U-Pb zircon geochronology, tectonic evolution, and chemical composition of the Vaasa batholith have been studied rather extensively (e.g., Lehtonen et al, 2005;Sipilä et al, 2008;Suikkanen et al, 2014;Kotilainen et al, 2016). However, U-Pb monazite chronology of the Vaasa granite has not been thoroughly examined.…”

Section: Introductionmentioning

confidence: 99%

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New monazite U-Pb age constraints on the evolution of the Paleoproterozoic Vaasa granitoid batholith, western Finland

Kotilainen¹,

Mänttäri²,

Kurhila³

et al. 2016

Bull Geol Soc Finland

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The Vaasa batholith, western Finland, is a large, peraluminous granitoid pluton that crystallized at 1.88-1.87 Ga during the culmination of the Svecofennian orogeny. The batholith has gradual contacts, through metatexites and diatexites, with the enveloping metasedimentary rocks of the Bothnian Belt. We present ID-TIMS U-Pb age data on monazite from granitoids and xenoliths of the Vaasa batholith and combine these with published U-Pb zircon ages in order to shed further light on the evolution of the Vaasa batholith. The apparent monazite ages for seven of the examined samples are 1870-1863 Ma, and 1855±3 Ma for one further sample from the southern part of the batholith. Combined with pre-existing data, the monazite ages of the granitoids are 9 to 18 Ma (face values) or 3 to 9 Ma (external errors considered) younger than the U-Pb zircon crystallization ages from respective samples. Our new data suggest slow cooling for the Vaasa batholith -the closure/saturation temperature of the monazite U-Pb system was probably reached in ~10 m.y. after the crystallization of magmatic zircon in the examined rocks.

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Section: Geologic Settingsupporting

confidence: 72%

Section: Samples and Analytical Methodsmentioning

confidence: 99%

Section: Samples and Analytical Methodsmentioning

confidence: 99%

Section: Geologic Settingmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

New monazite U-Pb age constraints on the evolution of the Paleoproterozoic Vaasa granitoid batholith, western Finland

Kotilainen¹,

Mänttäri²,

Kurhila³

et al. 2016

Bull Geol Soc Finland

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Full-Scale Crustal Interpretation of Kokkola–Kymi (KOKKY) Seismic Profile, Fennoscandian Shield

Tiira

Janik

Skrzynik

et al. 2020

Pure Appl. Geophys.

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The Kokkola-Kymi Deep Seismic Sounding profile crosses the Fennoscandian Shield in northwest-southeast (NW-SE) direction from Bothnian belt to Wiborg rapakivi batholith through Central Finland granitoid complex (CFGC). The 490-km refraction seismic line is perpendicular to the orogenic strike in Central Finland and entirely based on data from quarry blasts and road construction sites in years 2012 and 2013. The campaign resulted in 63 usable seismic record sections. The average perpendicular distance between these and the profile was 14 km. Tomographic velocity models were computed with JIVE3D program. The velocity fields of the tomographic models were used as starting points in the ray tracing modelling. Based on collected seismic sections a layer-cake model was prepared with the ray tracing package SEIS83. Along the profile, upper crust has an average thickness of 22 km average, and P-wave velocities (Vp) of 5.9-6.2 km/s near the surface, increasing downward to 6.25-6.40 km/s. The thickness of middle crust is 14 km below CFGC, 20 km in SE and 25 km in NW, but Vp ranges from 6.6 to 6.9 km/s in all parts. Lower crust has Vp values of 7.35-7.4 km/s and lithospheric mantle 8.2-8.25 km/s. Moho depth is 54 km in NW part, 63 km in the middle and 43 km in SW, yet a 55-km long section in the middle does not reveal an obvious Moho reflection. S-wave velocities vary from 3.4 km/s near the surface to 4.85 km/s in upper mantle, consistently with P-wave velocity variations. Results confirm the previously assumed high-velocity lower crust and depression of Moho in central Finland.

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Paleoproterozoic magmatism across the Archean-Proterozoic boundary in central Fennoscandia: Geochronology, geochemistry and isotopic data (Sm–Nd, Lu–Hf, O)

Lahtinen

Huhma

Lahaye

et al. 2016

Lithos

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Evolution of a Palaeoproterozoic giant magmatic dome in the Finnish Svecofennian; New insights from U–Pb geochronology

Cited by 10 publications

References 52 publications

New monazite U-Pb age constraints on the evolution of the Paleoproterozoic Vaasa granitoid batholith, western Finland

New monazite U-Pb age constraints on the evolution of the Paleoproterozoic Vaasa granitoid batholith, western Finland

Full-Scale Crustal Interpretation of Kokkola–Kymi (KOKKY) Seismic Profile, Fennoscandian Shield

Paleoproterozoic magmatism across the Archean-Proterozoic boundary in central Fennoscandia: Geochronology, geochemistry and isotopic data (Sm–Nd, Lu–Hf, O)

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