U-Th-Pb zircon geochronology on igneous rocks in the Toija and Salittu Formations, Orijärvi area, southwestern Finland: Constraints on the age of volcanism and metamorphism

Väisänen, Markku; Kirkland, Christopher L.

doi:10.17741/bgsf/80.2.001

Cited by 9 publications

(3 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1a). The preorogenic magmatism, defined as "island arc magmatism preceding onset of accretion or collision" (Nironen, 2005), comprises the 1.90-1.88 Ga volcanic rocks and their coeval plutonic magma chambers of the Häme belt and Uusimaa belts formed in volcanic arc settings (Väisänen et al 2002;Ehlers et al, 2004;Kähkönen, 2005;Väisänen and Kirkland, 2008;Saalmann et al, 2009).…”

Section: Geological Settingmentioning

confidence: 99%

Svecofennian intra-orogenic gabbroic magmatism: A case study from Turku, southwestern Finland

Nevalainen¹,

Väisänen²,

Lahaye³

et al. 2014

Bull Geol Soc Finland

Self Cite

View full text Add to dashboard Cite

Svecofennian intra-orogenic gabbroic magmatism: a case study from Turku, southwestern Finland Using single-grain zircon U-Pb dating by LA-MC-ICPMS and whole-rock geochemistry, we have studied the Palaeoproterozoic gabbroic rocks from Moisio in southwest Finland. Three ages were obtained. The interpreted intrusion age is ~1.86 Ga, which places it in the 1.87-1.84 Ga intra-orogenic period of southern Svecofennia. The other ages, ~1.89 Ga and ~1.83 Ga, are inferred to be inherited and metamorphic ages, respectively. The K, LREE, LILE, Fe-, P-, Ti-and F-concentrations reveal two compositionally distinct groups: (i) an enriched monzogabbro group and (ii) a less enriched gabbro group. The composition of the monzogabbro group resembles the other intra-orogenic intrusions from southern Svecofennia, whereas the unrelated gabbro group is more comparable to the synorogenic rocks in the region. The magma source the monzogabbro experienced a subduction related carbonate metasomatism, induced by sediment subduction and subduction erosion. Evidently, the Moisio monzogabbro represent enriched, mantle derived magmatism in southern Svecofennia as a part of the intra-orogenic igneous activity. The intra-orogenic magmatism is considered to have conveyed considerable amounts of heat from the mantle into the crust contributing to subsequent lateorogenic high-grade metamorphism.

show abstract

Section: Geological Settingmentioning

confidence: 99%

Svecofennian intra-orogenic gabbroic magmatism: A case study from Turku, southwestern Finland

Nevalainen¹,

Väisänen²,

Lahaye³

et al. 2014

Bull Geol Soc Finland

Self Cite

View full text Add to dashboard Cite

show abstract

“…However, at least locally, their intrusion took place during the last pulses of high heat flow (Vaasjoki and Sakko 1988;Väisänen et al 2000;Mouri et al 2005;Andersson et al 2006b;Baltybaev et al 2006;Väisänen and Kirkland 2008). Table 1.…”

Section: Regional Geologymentioning

confidence: 99%

1.8 Ga magmatism in southern Finland: strongly enriched mantle and juvenile crustal sources in a post-collisional setting

Rutanen

Andersson

Väisänen

et al. 2010

International Geology Review

View full text Add to dashboard Cite

“…Moreover, obtained 1878.2 ± 3.4 Ma age from a dacite from the upper part of the Kisko formation. Subsequently Väisänen and Kirkland (2008) attained 1878 ± 4 Ma concordia age from core domains of zircons from a felsic metavolcanic rock of the Toija Formation, and interpreted it to represent the crystallization of the rock. They attempted to date the SFm and although they did not get a direct age they concluded that the formation was deposited between 1878 and 1875 Ma.…”

Section: Stratigraphy and Age Correlationmentioning

confidence: 99%

The Salittu Formation in southwestern Finland, part I: Structure, age and stratigraphy

Nironen¹,

Mänttäri²,

Väisänen³

2016

Bull Geol Soc Finland

Self Cite

View full text Add to dashboard Cite

Because of the relatively low metamorphic grade, low strain and well-preserved early structures in volcanic and volcaniclastic rocks, the Orijärvi triangle (in the center of the larger Orijärvi area) is one of the few locations in the Svecofennian orogen of southern Finland where lithostratigraphy has been determined. The geochemistry of the picriticbasaltic metavolcanic rocks of the Salittu Formation, located in the northeastern part of the Orijärvi area, has been characterized but otherwise the bedrock and structures have been barely touched. After remapping we give an interpretation of structural evolution, provide new age data to constrain duration of volcanism at Salittu, and refine the stratigraphy in the Orijärvi area.The original stratigraphy is visible at Salittu: metabasalt overlies migmatitic gneisses, and metapicrite is on top. The rocks were folded during early Svecofennian D 1 -D 2 deformations, and the large synformal structures developed as D 2 -D 5 interference structures formed during late Svecofennian D 5 deformation. The structural pattern at Salittu is much the same as in the Orijärvi triangle.The new age data, combined with earlier published data, constrains the Salittu volcanism at ca. 1875 Ma. The stratigraphy in the Orijärvi area consists of the early (1.90-1.89 Ga) volcanic Orijärvi Formation, overlain by the sedimentary Vetio Formation, the volcanic Kisko Formation, the volcanic-sedimentary Ahdisto Formation, the volcanic Toija Formation, and on top the Salittu Formation, all emplaced at 1.88-1.87 Ga. We propose a model in which the Orijärvi Formation represents magmatism at the margin of a microcontinent, and the overlying package represents sedimentation and magmatism above a subduction zone during an initial stage of microcontinental accretion. D 1 deformation occurred in an advanced stage of accretion, after emplacement of the volcanic rocks of the Salittu Formation.

show abstract

U-Th-Pb zircon geochronology on igneous rocks in the Toija and Salittu Formations, Orijärvi area, southwestern Finland: Constraints on the age of volcanism and metamorphism

Cited by 9 publications

References 43 publications

Svecofennian intra-orogenic gabbroic magmatism: A case study from Turku, southwestern Finland

Svecofennian intra-orogenic gabbroic magmatism: A case study from Turku, southwestern Finland

1.8 Ga magmatism in southern Finland: strongly enriched mantle and juvenile crustal sources in a post-collisional setting

The Salittu Formation in southwestern Finland, part I: Structure, age and stratigraphy

Contact Info

Product

Resources

About