Geophysical interpretation of the crustal and upper mantle structure in the Wiborg rapakivi granite area, southeastern Finland

Elo, S.; Korja, Annakaisa

doi:10.1016/0301-9268(93)90081-c

Cited by 46 publications

(32 citation statements)

References 9 publications

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“…The rapakivi magmatism is clearly bimodal (Rämö 1991). In the Wiborg pluton area, in addition to rapakivi material, large amounts of gabbro-anorthosite parent magma form a numerous of dikes, stocks and sills within, around and under the low-density rapakivi granite (Elo & Korja 1993). Similar substantially large bodies of anorthosite, other gabbroids and ultramafics have been discovered in the southern part of the Riga pluton (Velikoslavinsky et al 1978;Birkis & Puura 1981).…”

Section: Resultsmentioning

confidence: 96%

“…-Data on the petrophysical properties for geophysical modelling were obtained from Puranen et al (1978Puranen et al ( , 1989, Puura et al (1983), and Pesonen et al (1989). The petrophysical study of the Wiborg rapakivi pluton suggests a more stable behaviour of density than of magnetic properties (Elo & Korja 1993). The major components (density 2625 kg/ m 3 ) form 96% of the samples and the minor components (2690 kg/m 3 ) only 4%.…”

Section: Interpretation Of the Potential Field Datamentioning

confidence: 99%

“…The Moho depth varies between 40 and 48 km (BABEL Working Group 1993a, 1993b. The Strombus Basin is located in the area of a Moho depression, typical of rapakivi igneous centres (Elo & Korja 1993;Puura & Flodén 1999, 2000. Eckermann (1937) advocated the presence of a large Jotnian sedimentary basin in the northern Baltic Sea, which is nowadays represented only by a number of tectonic basins, namely in Lake Mälaren (Flodén et al 1993), between the Landsort Trench and Fårö (Flodén 1973(Flodén , 1980, in the Åland Sea (Flodén 1973;Söderberg 1993) and in the Bothnian Sea (Winterhalter 1972;Axberg 1980;Korja & Heikinen 1995).…”

Section: Geological and Tectonic Settings Of The Strombus And Admete mentioning

confidence: 99%

“…The following values were used as model input parameters: (1) the estimated mean magnetic susceptibility 8500×10 -6 SI of (2) the average density contrast between the rapakivi granites and surrounding bedrock, -80 kg/m 3 at the surface and -105 kg/m 3 in the upper crust (Elo & Korja 1993); (3) the palaeomagnetic declination and inclination for the culmination of the Svecofennian orogeny, 326 and 30 degrees, respectively, and for the anorogenic rapakivi intrusion time (1.65-1.50 Ga), 17 and -8 degrees, respectively (Pesonen et al, 1989); (4) the mean magnetic susceptibility of the diabase-containing breccias and the Jotnian sandstone in the well "Verkegards 1", 1200×10 -6 and 2×10 -6 SI, respectively. Considering the origin of the igneous components, the breccias found on Fårö might be similar to the suite providing the well-defined linear magnetic maxima between the Landsort Trench and Fårö.…”

Section: Interpretation Of the Potential Field Datamentioning

confidence: 99%

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A complex model of Mesoproteozoic sedimentary and igneous suites in a graben setting north of Gotland, Baltic Sea

All

Flodén²,

Puura

2006

GFF

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Section: Resultsmentioning

confidence: 96%

Section: Interpretation Of the Potential Field Datamentioning

confidence: 99%

Section: Geological and Tectonic Settings Of The Strombus And Admete mentioning

confidence: 99%

Section: Interpretation Of the Potential Field Datamentioning

confidence: 99%

See 2 more Smart Citations

A complex model of Mesoproteozoic sedimentary and igneous suites in a graben setting north of Gotland, Baltic Sea

All

Flodén²,

Puura

2006

GFF

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“…Furthermore, batholiths are typically characterized by tabular geometries with thickness not exceeding 5 to 10 km (Elo and Korja, 1993;Petford et al, 2000). These low-aspect ratio bodies are the geometries most suitable for the comparison between modelled thermal gradients and experiments.…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

Natural equivalents of thermal gradient experiments

Rodríguez

Geyer

Castro

et al. 2015

Journal of Volcanology and Geothermal Research

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Crystallization experiments using the intrinsic thermal gradient in 10 mm length capsules loaded in piston-cylinder assemblies were used to investigate silicic magma crystallization. The application of experimental results to natural environments requires the scaling of physical parameters of petrological interest. Therefore, we propose here a comparative study between thermal gradients and numerical simulations of natural magma chambers. We use the Finite Element Method to calculate thermal profiles across a cooling silicic magma chamber. These numerical profiles are compared with the intrinsic thermal structure of half-inch, piston-cylinder assemblies at 500 MPa. It is concluded that a set of varied magma chamber geometries and/or distinct stages of their cooling history can approach the intrinsic thermal structure of laboratory experiments.Once the thermal properties for magma and its host rock are fixed, the experimentalnumerical approach is mostly dependent on the volume and aspect ratio of the magma

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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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Geophysical interpretation of the crustal and upper mantle structure in the Wiborg rapakivi granite area, southeastern Finland

Cited by 46 publications

References 9 publications

A complex model of Mesoproteozoic sedimentary and igneous suites in a graben setting north of Gotland, Baltic Sea

A complex model of Mesoproteozoic sedimentary and igneous suites in a graben setting north of Gotland, Baltic Sea

Natural equivalents of thermal gradient experiments

Full-Scale Crustal Interpretation of Kokkola–Kymi (KOKKY) Seismic Profile, Fennoscandian Shield

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