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4. Locations

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Location No. 05

Roadcut on highway E22. Park at the Almvik's Café parking area.
Attention: This part of the E22 has a high traffic flow!

R: 1537912 - H: 6412037
RT 90: N 57° 49' 53.8" - E 016° 26' 47.4"
WGS 84: N 57° 49' 52.6" - E 016° 26' 36.7"

Keywords: Västervik-Formation, quartzites, mylonites


Description:

This outcrop shows massive metaquartzites of the Västervik-Formation with dm to m scale folding (cf. fig. 4.5a-b). Their axial planes mostly strike NW-SE to NNW-SSE, i.e. parallel to the northwards adjoining LLDZ. At least two fold generations can be observed, partly causing fold interferences which produced dome-like structures with a sub-horizontal axis. Many planes contain slickensides on their polished surface. Preserved sedimentary structures like cross-bedding are rare but can be found with careful observation (cf. fig. 4.5c). To the naked eye these rocks look like typical metaquartzites, but thin sections often reveal mylonitic fabrics, including distinct textures (lattice-preferred orientation). Compared to the hinge zones the limbs of the folds have experienced a higher mylonitic deformation and recrystallization (A. Vollbrecht, pers. comm.; cf. fig. 4.5d-e). It is discussed if parts of these fold structures result from gravitational collapse. Aside from the metaquartzites, a dolerite (amer.: diabase) dike crosses this outcrop and can be found on both sides of the road.



Fig. 4.5a: Partial view of the outcrop with meter scale folding in the Västervik quartzites.
Fig. 4.5b: Partial view of the outcrop with meter scale folding in the Västervik quartzites.
Fig. 4.5c: Close up view of relicts of cross bedding. (Photo: K. Wemmer, pers. comm.)
Fig. 4.5d: Partial view of thin section shows porphyroclastic quartz-mylonite from the hinge zone of a fold, 2.5 x magnified. (Photo: A. Vollbrecht, pers. comm.)
Fig. 4.5e:Partial view of thin section shows mylonitic fabric of the Västervik quartzites from the limbs of a fold, 2.5 x magnified. (Photo: A. Vollbrecht, pers. comm.)


(top)

Fig. 4.5a
Fig. 4.5a

Fig. 4.5b
Fig. 4.5b

Fig. 4.5c
Fig. 4.5c

Fig. 4.5d
Fig. 4.5d

Fig. 4.5e
Fig. 4.5e
 

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