The age and origin of the Vaasa migmatite complex revisited

Suikkanen, Einari; Huhma, Hannu; Kurhila, Matti; Lahaye, Yann

doi:10.17741/bgsf/86.1.003

Cited by 7 publications

(17 citation statements)

References 30 publications

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“…In Fig. 4 our new Pb-Pb monazite ages and the U-Pb zircon ages published by Suikkanen et al (2014) and Kotilainen et al (2016), and U-Pb monazite ages of Alviola et al (2001) and Sipilä et al (2008) are shown relative to their distance to the approximated batholith border. The following observations can be made regarding the significance and interrelations of the monazite and zircon ages:…”

Section: Discussionmentioning

confidence: 99%

“…On trace elements, the quality control sample values were reproduced to better than 20 % accuracy, excluding Hf, which does not dissolve completely in HF-HClO 4 digestion, and thus yields unrealistically low concentrations. Sipilä et al (2008), Suikkanen et al (2014) and Kotilainen et al (2016), are marked. Inset shows location of the Vaasa batholith relative to Fennoscandia.…”

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: 98%

“…Schist inclusions, calc-silicate xenoliths, and Al-rich accessory minerals are common in the Vaasa batholith (e.g., Lehtonen et al, 2005;Sipilä et al, 2008). Garnet is common in the granitoids in southern parts of the batholith, sparse in the northern parts (Suikkanen et al, 2014).…”

Section: Geologic Settingmentioning

confidence: 99%

“…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: Discussionmentioning

confidence: 99%

Section: Samples and Analytical Methodsmentioning

confidence: 99%

Section: Geologic Settingmentioning

confidence: 98%

Section: Geologic Settingmentioning

confidence: 99%

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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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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Re-assessing the European lithium resource potential – A review of hard-rock resources and metallogeny

Gourcerol

Gloaguen

Melleton

et al. 2019

Ore Geology Reviews

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Lithium, which is an excellent conductor of heat and electricity, became a strategic metal in the past decade due to its widespread use in electromobility and green technologies. The resulting significant increase in demand has revived European interest in lithium mining, leading several countries to assess their own resources/reserves in order to secure their supplies. In this context, we present for the first time a geographically-based and geological compilation of European lithium hard-rock occurrences and deposits with their corresponding features (e.g., deposit types, Li-bearing minerals, Li concentrations), as well as a systematic assessment of metallogenic processes related to lithium mineralization. It appears that lithium is well represented in various deposit types related to several orogenic cycles from Precambrian to Miocene ages. About thirty hard-rock deposits have been identified, mostly resulting from endogenous processes such as lithium-cesium-tantalum (LCT) pegmatites (e.g., Sepeda in Portugal, Aclare in Ireland, Läntta in Finland), rare-metal granites (RMG; 5 3) Peraluminous, high-phosphorus RMG with strong enrichment in Ta, Sn, Li and F, occurring in a continental-collision setting. In this RMG type, Li concentrations can be high, from 0.5% to 1.0% Li 2 O, and occurring as lepidolite, Li-rich muscovite and amblygonite-montebrasite series, such as at

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The age and origin of the Vaasa migmatite complex revisited

Cited by 7 publications

References 30 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

Re-assessing the European lithium resource potential – A review of hard-rock resources and metallogeny

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