Paleomagnetic studies of rapakivi complexes in the Fennoscandian shield – Implications to the origin of Proterozoic massif-type anorthosite magmatism

Salminen, Johanna; Elming, Sten-åke; Mertanen, S.; Wang, Chong; Almqvist, Bjarne; Moakhar, Mohsen Oveisy

doi:10.1016/j.precamres.2021.106406

Cited by 12 publications

(3 citation statements)

References 132 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This complex is well documented by numerous drillings, therefore all AMCG members have been confirmed (Bagiński et al 2001;Dörr et al 2002;Skridlaite et al 2003;Gawęda et al 2009;Duchesne et al 2010;Wiszniewska and Krzemińska 2021). The MC is commonly listed among other prominent examples of rapakivitype granitoid and anorthosite massif occurrences Ashwal 2010;Salminen et al 2021). Granitoids of the MC (e.g.…”

Section: Introductionmentioning

confidence: 87%

“…The EEC comprises three protocontinents: Fennoscandia, Sarmatia and Volgo-Uralia, which experienced distinct tectonic and metamorphic evolutions until their final collision at ca. 1.8 Ga (Bogdanova et al 2015;Salminen et al 2021). Concurrently, significant crustal growth of Fennoscandia took place during Paleoproterozoic subduction-collision episodes of the Svecofennian orogeny (Bogdanova et al 2006(Bogdanova et al , 2015.…”

Section: Geological Settingmentioning

confidence: 99%

“…Over the past three decades the list has undoubtedly been expanded (cf. Salminen et al 2021), but does not yet include the Pietkowo IG1 quartz monzonite from the hidden part of Fennoscandia, which is characterized by the presence of texture resembling this of rapakivi-type granites (Fig. 3E, F).…”

Section: Sm-nd Isotopesmentioning

confidence: 99%

See 2 more Smart Citations

A new A-type granitoid occurrence in southernmost Fennoscandia: geochemistry, age and origin of rapakivi-type quartz monzonite from the Pietkowo IG1 borehole, NE Poland

et al. 2023

View full text Add to dashboard Cite

Rapakivi-type quartz monzonite and the underlying dark-grey granodiorite from the Pietkowo IG1 borehole, in the Polish part of southernmost Fennoscandia have been investigated using whole-rock geochemistry, Sm–Nd isotope geochemistry and U–Pb zircon dating. The quartz monzonite was emplaced at 1495–1491 Ma, although slightly older zircon cores (antecrysts) of 1513 Ma imply a two-stage crystallization. The geochemical similarities with Mazury Complex granitoids, their metaluminous and alkali-calcic nature, elevated contents of F, Ga and high-field-strength-elements (HFSE), indicate that the Pietkowo IG1 rapakivi-type quartz monzonite is an ‘A-type’ granitoid. The presence of magnetite and titanite indicates crystallization under oxidizing conditions. The rock is classified as A2 sub-type, and the Nb/Y ratio implies a within-plate setting. The dark-grey granodiorite, dated to 1813 Ma, has a calc-alkaline character, typical of a volcanic-arc environment. Initial whole rock εNd values range between -2.9 and -3.3 for the rapakivi-type quartz monzonite and from -1.0 to + 1.1 for the dark-grey granodiorite. We suggest that the A-type Pietkowo IG1 rapakivi-type quartz monzonite was generated from the dark-grey granodiorite via partial melting at middle to lower crustal levels. The most plausible ascent route for the quartz monzonite was via lithospheric-scale weakness zones, between the eastern margin of the Mazowsze Domain and Belarus-Podlasie Granulite Belt, i.e., the Białystok fault. Therefore, the Pietkowo IG1 rapakivi-type quartz monzonite is a representative of the Mesoproterozoic A-type granitoid occurrence in southernmost Fennoscandia.

show abstract

Section: Introductionmentioning

confidence: 87%

Section: Geological Settingmentioning

confidence: 99%

See 1 more Smart Citation

A new A-type granitoid occurrence in southernmost Fennoscandia: geochemistry, age and origin of rapakivi-type quartz monzonite from the Pietkowo IG1 borehole, NE Poland

et al. 2023

View full text Add to dashboard Cite

show abstract

Petrogenesis of microgranular enclaves in the A-type granitoid Krasnopol intrusion (Mazury Complex, northeastern Poland): Evidence of magma mixing

Domańska-Siuda,

Grabarczyk-Gurba,

Nejbert

2024

Miner Petrol

View full text Add to dashboard Cite

The origin of magmatic microgranular enclaves has been investigated in the Mesoproterozoic granitoid Krasnopol intrusion (1.5 Ga), part of the AMCG (anorthosite–mangerite–charnockite–granite) Mazury Complex in the East European Craton (NE Poland). The granitoids are ferroan and metaluminous, and display the typical characteristics of A-type granites, with high contents of Zr, Nb, Ga and rare earth elements (REEs). The enclaves are metaluminous and have a broad compositional range with two groups distinguished: silica-poor (45–50 wt% SiO2) and silica-rich (54 to 59 wt% SiO2), the latter overlapping in composition with the granitoid samples. The silica-poor enclaves are enriched in REEs compared to the silica-rich type, while the silica-rich enclaves exhibit trace-element patterns similar to those of the granitoids. Initial whole rock εNd values range between -3.8 and -4.0 for the granitoids and give a slightly wider range from -2.6 to -3.8 for the enclaves. The 87Sr/86Sr initial values vary from 0.7084 to 0.7138 for the granitoids and between 0.7052 and 0.7075 for the enclaves and indicate that the granitoids and enclaves are not isotopically identical. These may suggest that the two magmatic systems represented by the granitoid host rock and the enclaves, were probably derived from different sources, but with sufficient interaction, which led to a progressive change in the composition of the enclaves towards intermediate composition. We suggest that the mafic melts of the enclaves were generated at the base of the thickened crust through partial melting of the lower crustal source, with a significant contribution from mantle material. The increase in temperature resulted in anatexis of the lower crust and the formation of the granitoid parental magma.

show abstract

Paleoproterozoic tectonics of Fennoscandia and the birth of Baltica

Lahtinen,

Köykkä,

Salminen

et al. 2023

Earth-Science Reviews

View full text Add to dashboard Cite

Paleomagnetic studies of rapakivi complexes in the Fennoscandian shield – Implications to the origin of Proterozoic massif-type anorthosite magmatism

Cited by 12 publications

References 132 publications

A new A-type granitoid occurrence in southernmost Fennoscandia: geochemistry, age and origin of rapakivi-type quartz monzonite from the Pietkowo IG1 borehole, NE Poland

A new A-type granitoid occurrence in southernmost Fennoscandia: geochemistry, age and origin of rapakivi-type quartz monzonite from the Pietkowo IG1 borehole, NE Poland

Petrogenesis of microgranular enclaves in the A-type granitoid Krasnopol intrusion (Mazury Complex, northeastern Poland): Evidence of magma mixing

Paleoproterozoic tectonics of Fennoscandia and the birth of Baltica

Contact Info

Product

Resources

About