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4. Locations

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Location No. 20

Qarry, located about 500 m SW’ of the lake Götemar. Approach via Misterhults Gård and Götebo.

R: 1546549 - H: 6371714
RT 90: N 57° 28' 07.4" - E 016° 35' 02.8"
WGS 84: N 57° 28' 06.4" - E 016° 34' 52.2"

Keywords: anorogenic granite


Description:

With an age of about 1.38 Ga the Götemar granites in the southernmost part of the Västervik area represent a clearly postkinematic (anorogenic) type of granite that intruded the Småland granites. The Götemar massif is, as well as the granites from the Blå Jungfrun island, assigned to the Rapakivi granites, but they are lithologically definitely unequal (Kresten & Chyssler 1976, Åberg et al. 1985). The massif is rather circular with a diameter of about 5 km. Götemar granites are highly evolved alkali-rich granites with mafic components of less than 3.5 vol.% and a high proportion of volatiles. High fluorine contents led to mineralization of fluorite (CaF2) (cf. fig. 4.29c). Three major varieties of coarse-, medium- and fine-grained character are developed, but only the coarse-grained variety has been quarried (cf. fig. 4.20a). It is characterized by red K-feldspar megacrysts surrounded by granular or drop shaped quartz grains (Kresten & Chyssler 1976) (cf. fig. 4.20b).

The Götemar massif is divided by a major N-S striking fault with a 200 m lateral displacement in sinistral direction and about 500 m uplift of the western part. Kresten & Chyssler (1976) concluded that a deeper section of the massif is exposed on the western side. The contacts to the surrounding Småland granites are generally sharp and xenoliths are entirely absent. Zonation of the massif lead to the conclusion that it has developed in multi-phase instrusions. Though it is assumed that the Götemar granites took place in a shallow level, signs of marginal chilling and flow fabrics are lacking, whereas pegmatites are most common. This is referred to the high content of volatiles (Kresten & Chyssler 1976).



Further Reading:

Kresten, P. & Chyssler, J., 1976. The Götemar massif in south-eastern Sweden: A reconnaissance survey, GFF, 98, 155-161.

Åberg, G., Löfvendahl, R. & Levi, B., 1985. The Götemar granite – isotopic and geochemical eveidence for a complex history of an anorogenic granite, GFF, 106, 327-333.



Fig. 4.20a: Partial over view of the Götemar quarry, now filled with water.
Fig. 4.20b: Close up view of the coarse-grained Götemar granite, showing red colored K-Feldspar megacrysts.
Fig. 4.20c: Close up view showing mineralization of fluorite. (Photo: K. Wemmer, pers. comm.)


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Fig. 4.20a
Fig. 4.20a

Fig. 4.20b
Fig. 4.20b

Fig. 4.20c
Fig. 4.20c
 

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