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4. Locations

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Location No. 10

Approach outcrop via the road Gunnebo - Fermesbo. Park at the parking area of the Badplats Gunnebo.

R: 1545160 - H: 6399310
RT 90: N 57° 42' 59.9'' - E 016° 33' 58.0''
WGS 84: N 57° 42' 58.8'' - E 016° 33' 47.3''

Keywords: xenoliths, granites, metasediments


Description:

The roadcut about 100m west of the parking area of the Badplats Gunnebo shows different kinds of xenoliths in granite. These xenoliths are partly migmatized metasediments of the Västervik-Formation. They are frequently in sharp contact with the matrix. The xenoliths display stromatic or layered fabrics, which are characterized by an alternation between light and dark bands. Smaller fragments are partly melted and the light, quartz- and feldspar-rich neosome flows around the paleosome. The granite is coarse- to very coarse-grained and gray or red-gray in color.

This outcrop may be interpreted as a rooftop of a granite pluton where magma intruded by stoping into the metasediments. During this event fragments were falling into the still viscous granite and, if not completely molten, remained in the igneous rock. The granite contains diffuse patches with higher biotite content, which may be interpreted as restites, i.e., remnants of almost completely assimilated xenoliths.



Fig. 4.10a: Partial overview of the outcrop.
Fig. 4.10b: Close up view shows a fragment of fine-layered metasediment within the granite.
Fig. 4.10c: Close up view shows remnants of metasediment with a rim of neosome.


(top)

Fig. 4.10a
Fig. 4.10a

Fig. 4.10b
Fig. 4.10b

Fig. 4.10c
Fig. 4.10c
 

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