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The Jormua Ophiolite (Finnish: Jormuan ofioliitti) is a remnant of ancient oceanic lithosphere near the village of Jormua close to the geographical centre of Finland. The rocks of the Jormua Ophiolite formed about 1,950 million years ago in the Paleoproteozoic Era. The conditions under which the ocean crust rocks of Jormua formed was likely similar to present-day Red Sea. Thus, a linear sea of this type is thought to have existed between two continental landmasses in Finland. At some point this sea closed and the ophiolite was obducted.

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  • The Jormua Ophiolite (Finnish: Jormuan ofioliitti) is a remnant of ancient oceanic lithosphere near the village of Jormua close to the geographical centre of Finland. The rocks of the Jormua Ophiolite formed about 1,950 million years ago in the Paleoproteozoic Era. The conditions under which the ocean crust rocks of Jormua formed was likely similar to present-day Red Sea. Thus, a linear sea of this type is thought to have existed between two continental landmasses in Finland. At some point this sea closed and the ophiolite was obducted. The Jormua ophiolite is the best preserved one along a larger chain of ophiolites that occur within the Kainuu Schist Belt. The crustal rocks of the ophiolite include pillow lava, hyaloclastite, sheeted dykes, gabbro, plagiogranite and ultramafic cumulate rock. Mantle rocks exposed in the ophiolite are the peridotite varieties of lherzolite, harzburgite and dunite. (en)
  • Jormuaofioliten (finska: Jormuan ofioliitti) är en rest av uråldrig oceanisk litosfär som hittas nära orten i finska Kajanaland. Bergarterna i Jormuaofioliten bildades för cirka 1 950 miljoner år sedan, under den paleoproteozoiska eran. Bildningsmiljön för bergarterna, som utgör oceanisk jordskorpa, liknade troligen den som finns i nutida Röda havet. Det betyder att det vid denna plats under paleoproterozoikum ska ha funnits ett hav som, likt Röda havet, legat mellan två kontinentala landmassor. Vid något senare skede gick de kontinentala massorna ihop och havet stängdes, varvid en del av havsbottnen sköts upp på land och resulterade i Jormuaofioliten. Jormuaofioliten är den bäst bevarade i en kedja av ofioliter i Kajanalands skifferbälte. Berarterna i ofioliten inkluderar kuddlava, hyaloklastit, skivade gångsvärmar, gabbro, plagiogranit (trondhjemit) och ultrabasiska kumulatbergarter. Mantelbergarter exponerade i ofioliten är peridotitbergarterna lherzolit, harzburgit och dunit. (sv)
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  • Selection of outcrop localities mentioned in the text. (en)
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  • The Jormua Ophiolite (Finnish: Jormuan ofioliitti) is a remnant of ancient oceanic lithosphere near the village of Jormua close to the geographical centre of Finland. The rocks of the Jormua Ophiolite formed about 1,950 million years ago in the Paleoproteozoic Era. The conditions under which the ocean crust rocks of Jormua formed was likely similar to present-day Red Sea. Thus, a linear sea of this type is thought to have existed between two continental landmasses in Finland. At some point this sea closed and the ophiolite was obducted. (en)
  • Jormuaofioliten (finska: Jormuan ofioliitti) är en rest av uråldrig oceanisk litosfär som hittas nära orten i finska Kajanaland. Bergarterna i Jormuaofioliten bildades för cirka 1 950 miljoner år sedan, under den paleoproteozoiska eran. Bildningsmiljön för bergarterna, som utgör oceanisk jordskorpa, liknade troligen den som finns i nutida Röda havet. Det betyder att det vid denna plats under paleoproterozoikum ska ha funnits ett hav som, likt Röda havet, legat mellan två kontinentala landmassor. Vid något senare skede gick de kontinentala massorna ihop och havet stängdes, varvid en del av havsbottnen sköts upp på land och resulterade i Jormuaofioliten. (sv)
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  • Jormua Ophiolite (en)
  • Jormuaofioliten (sv)
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