Vinga (Gothenburg)

Vinga is a small island 10 nautical miles (19 km; 12 mi) outside Gothenburg's harbour entrance in Sweden. The 19th century Vinga Lighthouse is noted, not only as a beacon in the waterway of the Swedish west coast, but also as the place where the Swedish poet laureate Evert Taube grew up. Today Vinga is a tourist attraction, with boats to and from Gothenburg harbour.[1]

Vinga island in May 2013.

Geology

The bedrock of Vinga is mostly made up of porphyrite (porfyrit), a volcanic rock with less Silicon dioxide, SiO₂, than porphyry. The rock has a fine-grained structure, dark with lighter grains of feldspar and other minerals. The mineralogical composition of the Vinga porphyry classifies it as a monzogranite or quartz diorite. The northern part of the island contains orthopyroxene. The Vinga porphyry was created about 950 million years ago, when it penetrated the surrounding older gneiss rock.[2]

References

"Vinga – Porten till Göteborg och Västkusten" [Vinga – Gate to Gothenburg and the West Coast]. www.vinga.net. Vinga.net. Retrieved 24 August 2015.
Årebäck, H; Andersson, UB; Petersson, J (2008). "Petrological evidence for crustal melting, unmixing, and undercooling in an alkali-calcic, high-level intrusion: the late Sveconorwegian Vinga intrusion, SW Sweden". Contributions to Mineralogy and Petrology (93): 1–46.

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[1] "Vinga – Porten till Göteborg och Västkusten" [Vinga – Gate to Gothenburg and the West Coast]. www.vinga.net. Vinga.net. Retrieved 24 August 2015.

[2] Årebäck, H; Andersson, UB; Petersson, J (2008). "Petrological evidence for crustal melting, unmixing, and undercooling in an alkali-calcic, high-level intrusion: the late Sveconorwegian Vinga intrusion, SW Sweden". Contributions to Mineralogy and Petrology (93): 1–46.