Paleoproterozoic sediment recycling during multiphase orogenic evolution in Fennoscandia, the Tampere and Pirkanmaa belts, Finland

Lahtinen, Raimo; Huhma, Hannu; Kähkönen, Y.; Mänttäri, Irmeli

doi:10.1016/j.precamres.2009.08.008

Cited by 36 publications

(18 citation statements)

References 72 publications

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“…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). Previous U-Pb monazite analyses of the Vaasa batholith have yielded ages between 1872 and 1858 Ma (Alviola et al, 2001;Sipilä et al, 2008).…”

Section: Geologic Settingmentioning

confidence: 98%

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 Settingmentioning

confidence: 98%

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 data of Vervoort et al (1999) show that active margin sediments have in general more radiogenic Hf-isotopic compositions than passive margin sediments because of the input of arc-related volcaniclastic material. The observed Hf-isotopic variation could thus indicate that the input of material originating from the volcanic rocks of the Ylivieska arc and the Evijärvi area (Kähkönen, 2005;Lahtinen et al, 2009) has decreased towards southsouthwest in the Vaasa migmatite complex. However, the fact that this is not indicated by the Nd isotopic compositions shows that the comparison between zircon Hf and whole-rock Nd isotopes is not straightforward.…”

Section: Sm-nd and Lu-hf Isotopesmentioning

confidence: 99%

“…Nironen, 1997;Lahtinen et al 2005), the idea of a Bothnian basin has not been refuted. At 1.92-1.91 Ga the Bothnian basin next to the primitive arc complex was filled with sediment originating from Proterozoic microcontinents, the primitive arc, as well as from the Karelian craton (Lahtinen et al, 2009). In western Finland the orogeny culminated at 1.90-1.87 Ga when the arc complex of central and western Finland accreted at the edge of the primitive arc complex (Lahtinen et al, 2005).…”

Section: Geological Settingmentioning

confidence: 99%

“…The bulk of the Archean detritus has most likely been derived from the Karelian craton and the adjacent c. 1.92 Ga Savo arc is a probable source for the <1.93 Ga detrital zircons (cf. Lahtinen et al, 2009). 2.6-2.1 Ga zircon is considered rare in Svecofennian metasedimentary rocks (Claesson et al 1993;Lahtinen et al, 2002), which is also the case in the present study, as only two cores within this age range were found.…”

Section: Agesmentioning

confidence: 99%

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The age and origin of the Vaasa migmatite complex revisited

Suikkanen¹,

Huhma²,

Kurhila³

et al. 2014

Bull Geol Soc Finland

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“…This accreted arc complex is the Central Svecofennian terrane. Accretion of another arc complex (Fennian orogeny) started ~1.89 Ga ago, leading to deformation and voluminous magmatism in the Central Svecofennian terrane, as well as metamorphism that attained peak at ~1.88 Ga (Mouri et al, 1999;Lahtinen et al, 2009). By 1.87 Ga, deformation had almost ceased in the Central Svecofennian terrane, while plutonism continued in the newly accreted arc complex (Southern Svecofennian terrane) until 1.80 Ga.…”

Section: Introductionmentioning

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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Paleoproterozoic sediment recycling during multiphase orogenic evolution in Fennoscandia, the Tampere and Pirkanmaa belts, Finland

Cited by 36 publications

References 72 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

The age and origin of the Vaasa migmatite complex revisited

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

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