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4. Locations

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Location No. 01

Roadcut on highway E22 north of Edsbruck, about 3 km north of the exit to Hulta. Parking on a turnout. Time should be taken in observing the rocks on both sides of the road.

R: 1541936 - H: 6434351
RT 90: N 58° 01' 53.7" - E 016° 31' 05.5"
WGS 84: N 58° 01' 52.5" - E 016° 30' 54.6"

Keywords: veined amphibolitic gneisses, plate boundary, LLDZ, Svecofennian Domain


Description:

This excellent outcrop along highway E22 shows so-called veined amphibolitic gneisses in the metavolcanic terrain northeast of the LLDZ. These former volcanic sediments are considered to belong to the southern part of the Svecofennian Domain. The amphibolitic matrix is dark in color, dense and fine grained, and is interbedded with steeply dipping white vertical bands of varying thickness (cf. fig. 4.1a-c). The white bands show minimum-melt composition of quartz, K-feldspar and plagioclase (Beunk 1996). Additionally several pegmatite dikes intruded into these rocks (cf. fig. 4.1d). In his excursion guide Beunk (1996) noticed a NW-SE striking foliation which probably originated from the D2 deformation.



Further Reading:

Beunk, F.F., 1996. Geology of the Loftahammar Area: Introduction and Excursion Guide, EUROBRIDGE 1996 Workshop, Oskarshamn, Sweden: Southern Baltic Shield - correlation of shallow and deep structures, 1- 44.

General information on the development of the LLDZ:
Beunk, F.F. & Page, L.M., 2001. Structural evolution of the accretional continental margin of the Paleoproterozoic Svecofennian orogen in southern Sweden, Tectonophysics, 339, 67-92.



Fig. 4.1a: Partial view of the outcrop. (Photo: K. Wemmer, pers. comm.)
Fig. 4.1b: Close up shows the straight veining. (Photo: K. Wemmer, pers. comm.)
Fig. 4.1c: Close up of the veining shows the general sharp contact of melanosome and leucosome.
Fig. 4.1d: Close up of a pegmatite vein.


(top)


Fig. 4.1a

Fig. 4.1b
Fig. 4.1b

Fig. 4.1c
Fig. 4.1c

Fig. 4.1d
Fig. 4.1d
 

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