north Norwegian Caledonides —
The Linnajavri area, subdivided in Linnajavri northern and southern area, is located in Hamarøy municipality, Nordland county, northern Norway. During five short field seasons (1–3 weeks) from 2001 to 2006, the ultramafic bodies of the Linnajavri area have been outlined and the soapstone alteration...
| Main Authors: | , , |
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.628.2702 http://www.ngu.no/upload/Publikasjoner/Special publication/SP11_03_Lindahl.pdf |
| Summary: | The Linnajavri area, subdivided in Linnajavri northern and southern area, is located in Hamarøy municipality, Nordland county, northern Norway. During five short field seasons (1–3 weeks) from 2001 to 2006, the ultramafic bodies of the Linnajavri area have been outlined and the soapstone alteration studied in detail for evaluation of its possible potential for exploitation. The Linnajavri area is built up of Caledonian nappes thrust over Precambrian granitic basement exposed to the west of the nappe pile. Our work has focused on rocks of the Seve and Köli nappes of the Upper Allochthon. Within the Köli rocks, a number of tectonic mélange zones have taken up the stress built up between blocks of rock, especially in the area with ultramafic bodies, thereby preserving primary depositional structures and evidence of alteration processes in the rocks between the mélange zones. The ultramafic bodies, gabbros and pillow lavas are interpreted to represent ophiolite fragments. In their present setting, they are associated with conglomeratic weathering products of the ophiolites. The ultramafic rocks are dunite, peridotite and, to a subordinate degree, pyroxenite. All the ultramafic rocks are strongly serpentinised and to an extensive degree also further altered to soapstone. Listwaenite, the end product in this alteration chain, is also encountered in the Linnajavri southern area. Only one of the ultramafic bodies shows |
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