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4. Locations

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Location No. 14

Approach outcrop via road from Gladhammar to Västrum. Shortly after Högsby turn left and enter to “Stenbrott Edelhammar”. Park inside of the quarry.

R: 1539087 - H: 6397225
RT 90: N 57° 41' 54.6" - E 016° 27' 49.9"
WGS 84: N 57° 41' 53.5" - E 016° 27' 39.3"

Keywords: younger granites


Description:

This outcrop shows a granite variation of the so-called younger granites. The rock appears medium-grained and gray to red-gray in color. The rough surfaces is caused by K-feldspars which are more resistant to weathering. The Edelhammar granite only shows locally developed schistosity (cf. fig. 4.14b-c). According to Hoffman (2001), in thin sections the granite appears granular grained with a proportion of mafic minerals (biotite, titanite (sphene) and pyrite) ranging between 5 and 30% accumulated in nests. Chlorite and muscovite occur as accessories. Hoffmann (2001) has noticed microcline lattice and perthitization of K-feldspars as well as saussuritization and sericitization of plagioclase which she related to post-magmatic overprinting such as metasomatism. On fresh explosion surfaces mafic enclaves can be observed. The quarry additionally offers the view of numerous steeply dipping brittle faults which strike nearly N-S to NNW-SSE. Along these faults the rocks have experienced cataclastic deformation. Pegmatites, steeply inclined aplites, quartz and epidote veins can also be found in the surroundings (Hoffmann 2001).



Fig. 4.14a: Close up view of Edelhammar granite, displaying a weak foliation.
Fig. 4.14b: Close up view of fig. 4.12b, displaying an accumulation of mafic minerals.
Fig. 4.14c: Partial view of thin section shows equigranular quartz aggregate, 5 times magnified. (Photo: A. Vollbrecht, pers. Comm.)
Fig. 4.14d: Partial view of thin section shows plagioclase with zonation and alterated core, 2.5 times magnified. (Photo: A. Vollbrecht, pers. Comm.)


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Fig. 4.14a
Fig. 4.14a

Fig. 4.14b
Fig. 4.14b

Fig. 4.14c
Fig. 4.14c

Fig. 4.14d
Fig. 4.14d
 

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