Timing of accretion, intra-orogenic sedimentation and basin inversion in the Paleoproterozoic Svecofennian orogen: The Pyhäntaka area, southern Finland

Nironen, Mikko; Mänttäri, Irmeli

doi:10.1016/j.precamres.2011.09.013

Cited by 14 publications

(7 citation statements)

References 43 publications

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“…Sedimentary basins existed at the time shown by detrital zircons of intraorogenic age in quartzites in central Sweden and southern Finland (c. 1.87-1.84 Ga; Claesson et al, 1993;Lahtinen et al, 2002;Bergman et al, 2008) and ultra-mature lateritic paleosols found between the quartzites and the basement rocks below (Lahtinen & Nironen, 2010). These findings and structural studies (Pajunen et al, 2008;Skyttä & Mänttäri, 2008;Nironen & Mänttäri, 2012) indicate that sedimentary basins were formed by extension of the Fennian crust. Associated intraorogenic magmatism was also expected (Lahtinen et al, 2005).…”

Section: Introductionmentioning

confidence: 75%

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

Nevalainen¹,

Väisänen²,

Lahaye³

et al. 2014

Bull Geol Soc Finland

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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.

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Section: Introductionmentioning

confidence: 75%

“…The 1.84-1.80 Ga Svecobaltic collision led to basin inversion and crustal thickening (Lahtinen et al, 2005;Nironen & Mänttäri, 2012). In southern Svecofennia the Svecobaltic orogeny is coeval with high-grade metamorphism and crustal melting, with peak conditions of c. 800 °C and 6 kbar at 1.83-1.81 Ga (e.g.…”

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

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“…3b) although this is poorly constrained: shallowwater and fluvial quartz-rich sandstones, now quartzites, were deposited at c. 1.85 Ga and are now found locally in the vicinity of the presumed palaeomargin (the 'intraorogenic metasediments' in Fig. 2b; Bergman et al, 2008;Nironen and Mänttäri 2012). In any case, orogenic convergence resumed by 1.84 Ga, resulting in renewed deformation (e.g.…”

Section: Geological Settingmentioning

confidence: 99%

How does orogenic crust deform? Evidence of crustal-scale competent behaviour within the partially molten middle crust during orogenic compression

Torvela

Kurhila

2020

Precambrian Research

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“…5. A more detailed presentation of the structure is given by Nironen and Mänttäri (2011). The predominant foliation is usu- ally subparallel to the lithological layering, dipping moderately to steeply N-NNW in areas not deformed by later folding.…”

Section: General Structural Patternmentioning

confidence: 99%

“…Structural interpretation of the Pyhäntaka area, based on new age determinations (Nironen & Mänttäri, 2011), indicates that the Härkälä metagraywackes are older (>1885 Ma) than the geochemically rather similar Himattu and Kesua metagraywackes (<1875 Ma); the Härkälä graywackes were deformed and metamorphosed into high-grade gneisses before deposition of the Himattu graywackes. Accordingly, the Pyhäntaka NE metavolcanics may be older than the Pyhäntaka C, Pyhäntaka fm and Pyhäntaka SW metavolcanics.…”

Section: Implications Of Geochemistrymentioning

confidence: 99%

The Pyhäntaka formation, Southern Finland: A sequence of metasandstones and metavolcanic rocks upon an intra-orogenic unconformity

Nironen¹

2011

Bull Geol Soc Finland

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Detrital zircon studies suggest that the few quartzite occurrences in southern Finland are younger than 1.87 Ga and express sedimentation after 1.89-1.87 Ga accretional deformation and metamorphism in the Svecofennian orogenic belt. Detailed field work in the high-grade metamorphic Pyhäntaka area allowed to distinguish an overturned formation within metagraywackes (cordierite paragneisses) and psammites. The Pyhän-taka formation has a maximum thickness of 1000 meters and consists of quartzite overlain by meta-arkose, metatuff, and metabasalt on top. An uncorformity, expressed by a weathering surface, separates the quartzite from underlying metagraywacke. The metavolcanic rocks within, stratigraphically underlying and overlying the Pyhäntaka formation are mostly basalts and basaltic andesites, but a felsic volcanic rock and dacitic fragments in volcaniclastic rocks imply bimodal affinity. The quartzite was deposited during a stable intra-orogenic period probably after accretion but before 1.83-1.80 Ga collisional deformation and metamorphism in the Svecofennian orogen. Rifting during the intraorogenic period and accumulation of variable material in the rift from nearby sources by fluvial processes is a viable scenario for deposition and preservation of the Pyhäntaka formation. Geochemical diagrams of the metavolcanic rocks show a scatter that is best explained by source heterogeneity and crustal contamination. Despite their (likely) postaccretion setting the basaltic rocks show arc-type characteristics due to subductionmodified lithospheric mantle sources. Because of recycling, also the paragneisses in the Pyhäntaka area are geochemically similar in spite that they represent different tectonic settings. The use of elemental geochemistry alone appears to be insufficient for discriminating tectonic settings of basalts or graywackes in the Svecofennian of southern Finland where accretion and post-accretion settings were largely obliterated by late collision.

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Timing of accretion, intra-orogenic sedimentation and basin inversion in the Paleoproterozoic Svecofennian orogen: The Pyhäntaka area, southern Finland

Cited by 14 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

How does orogenic crust deform? Evidence of crustal-scale competent behaviour within the partially molten middle crust during orogenic compression

The Pyhäntaka formation, Southern Finland: A sequence of metasandstones and metavolcanic rocks upon an intra-orogenic unconformity

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