Mid‐Norden; gravity and magnetic anomaly maps

Aaro, Sven; Elo, S.; Gustavsson, N.; Henkel, Herbert; Hult, Karin; Kauniskangas, Esa; Kero, L.; Kihle, Ola; Lehtonen, M.; Ruotoistenmäki, Tapio; Sindre, A.; Skilbrei, Jan Reidar; Tervo, Timo; Thorning, L

doi:10.1080/11035899609546405

Cited by 2 publications

(3 citation statements)

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“…circular pattern of positive anomalies at its center. The magnetic data of the Mid-Norden do not yield any circular anomalies for Lycksele, however (Aaro et al, 1994), but the aeromagnetic anomaly map of Scandinavia (Eriksson and Henkel, 1983) shows an elongated negative (-400 nT) magnetic anomaly some 50 km south of Lycksele; this anomaly (which matches with the free-air gravity anomaly of Fig. 4c), may not be related to Lycksele structure, however.…”

Section: (D) Free-air Gravity Map Of Fennoscandiamentioning

confidence: 63%

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The impact cratering record of Fennoscandia

Pesonen

Henkel

1996

Earth Moon Planet

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Section: (D) Free-air Gravity Map Of Fennoscandiamentioning

confidence: 63%

“…Recent Mid-Norden residual gravity anomaly map (Aaro et al, 1994) reveal a pattern of circumring negative gravity anomalies (up to -20 mGa1) close to, but slightly to the west of the Lycksele structure, with (Granar et al, 1993). (d) Total field aeromagnetic anomaly map (Eriksson and Henkel, 1994).…”

Section: Huge Multiring Structures In Fennoscandiamentioning

confidence: 97%

The impact cratering record of Fennoscandia

Pesonen

Henkel

1996

Earth Moon Planet

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“…2). However, its continuation from the Gulf of Bothnia and southwards into the Baltic sea is very uncertain based on geophysical constraints (Aaro et al 1994). …”

Section: Geologymentioning

confidence: 99%

The relationship between 1.88 Ga old magmatism and the Baltic-Bothnian shear zone in northern Sweden

Wikström

Skiöld

Öhlander

1996

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New geochemical data and U-Pb ages for Proterozoic mafic and felsic dykes and their granitic host rocks in the Bl~isberget Massif, proximal to the Baltic-Bothnian shear zone, indicate that these rocks are part of a terrane distinct from Svecofennian terranes in Central and Southern Sweden. The dykes comprise a NNE-trending swarm which can be traced over a strike length of about 20 km. Most of the mafic dykes are internally deformed and have systematic internal structures showing a sinistral horizontal component and an eastern-side-up sense of movement. This sinistral shearing is also observed within the nearby Baltic-Bothnian shear zone.The mafic dykes have a uniformly basaltic composition. High content of elements such as Ti and Zr illustrate the typical 'within-plate' character. The felsic dykes are chemically homogeneous and have a Sit 2 content of about 77 wt%. High content of Y, Yb and Nb confirms the 'within-plate' character of the dyke swarm.Zircons extracted from one of the felsic dykes indicate a U-Pb age of c. 1.88 Ga. Approximately the same age has been obtained from the host rock granite and from a nearby occurrence of a similar late-orogenic granite. Since the dykes cross-cut most deformation and migmatite structures and most likely represent the waning stages of orogenic deformation in the area, it is evident that the timing of the orogenic events in the area is different and older than the Svecofennian development in central and southern Sweden.A genetic relationship is suggested between the magmatism and the development of the Baltic-Bothnian shear zone.

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Mid‐Norden; gravity and magnetic anomaly maps

Cited by 2 publications

References 0 publications

The impact cratering record of Fennoscandia

The impact cratering record of Fennoscandia

The relationship between 1.88 Ga old magmatism and the Baltic-Bothnian shear zone in northern Sweden

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