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4. Locations

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Location No. 16

Approach outcrop via road Gunnebo – Västrum, before entering Västrum take the small road on the right-hand side to Björnhuvud. Short walk to the southern bay of Björnhuvud.

R: 1545250 - H: 6391080

Keywords: sedimentary dyke


Description:

This sedimentary dike has a thickness of 5 cm and is quite similar to the one at location no. 06, but here one walks across the polished rocks and can trace the dike for several meters. The host rock is a coarse-grained granite which, according to Gavelin (1984), probably belongs to the younger granitoids. The sedimentary dike is steeply dipping and strikes NE-SW. According to Frei (1997), the green colored matrix mainly consists of rounded quartz grains and chlorite, angular shaped feldspar. Muscovite occur in minor amounts. Granitic fragments, probably from the host rock, can also be observed.



Further Reading:

Bergman, L., 1982. Clastic dikes in the Åland Islands, SW Finland and their origin. In L. Bergman, R. Tynni & B. Winterhalter (eds.): Paleozoic sediments in the Rapakivi area of the Åland Islands. - Bull. Geol. Soc. Finland, 317: pp 8 - 32.

Katzung, G. & Obst, K., 1997. The sandstone dike swarm of Vang, Bornholm -8Denmark). - Bulletin of the Geological Society of Denmark, Vol. 44: pp. 161-171.

Tynni, R.,1982. On Paleozoic microfossils in clastic dikes in the Åland Islands and in the core samples of Lumparn. In L. Bergman, R. Tynni & B. Winterhalter (eds.): Paleozoic sediments in the Rapakivi area of the Åland Islands. - Bull. Geol. Soc. Finland, 317: pp 8 - 32.

Jacke, O. & Vollbrecht, A., 2004. Sedimentgänge in proterozoischen Graniten der Västervik-Region (SE-Schweden), Terra Nostra 2004/01, TSK X: 10. Symposium Tektonik, Struktur- und Kristallingeologie, Aachen, 31.03. - 02.04.2004, Abstr.: 35.



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