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4. Locations

# 01 - # 02 - # 03 - # 04 - # 05 - # 06 - # 07 - # 08 - # 09 - # 10
# 11 - # 12 - # 13 - # 14 - # 15 - # 16 - # 17 - # 18 - # 19 - # 20



Location No. 02

Roadcut on highway E22 north of Edsbruck, about 1.2 km north of the exit to Hulta, opposite to the entry to Bälsjö. Park on the turnout to Bälsjö. Time should be taken in observing the rocks on both sides of the road.

R: 1542138 - H: 6433516
RT 90: N 58° 01' 26.7" - E 016° 31' 17.2"
WGS 84: N 58° 01' 25.4" - E 016° 31' 06.4"

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


Description:

The rocks in this outcrop along highway E22, also shows veined gneisses northeast of the LLDZ, but the differences to location no. 01 are striking. In this case a red-colored granitoid with conspicuous schistosity, probably belonging to the older granites, encloses a lens of a dark gray to red gray colored, dense and fine-grained migmatized rock (cf. fig. 4.2a).

This rock is intruded by veins of granitic composition containing a red colored leucosome and a dark rim of melanosome. Unlike location no. 01 the veins seem to occur as tension gashes in en échelon arrangement (cf. fig. 4.2b-c). This migmatite probably belongs to the Svecofennian metavolcanic formation.


Study Questions:
  • Try to figure out if you can name the direction of
    movement by means of the veins and whether they
    can be considered as venites or artenites.
  • How many generations of veins can you find?


Further Reading:

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. 4.2a: Overview of the outcrop. (Photo: K. Wemmer, pers. comm.)
Fig. 4.2b: Leucocratic veins with melanocratic rim intruding the migmatized host rock.
Fig. 4.2c: Close up view of intersecting granitic veins. (Photo: K. Wemmer, pers. comm.)


(top)

Fig. 4.2a
Fig. 4.2a

Fig. 4.2b
Fig. 4.2b

Fig. 4.2c
Fig. 4.2c
 

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