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- Öhlander, Björn
(författare)
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A molybdenite province in Norrbotten and Västerbotten, northern Sweden
- 1983
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Ingår i: Geologiska föreningens i Stockholm förhandlingar. - : Informa UK Limited. - 0016-786X. ; 105:3, s. 229-234
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Tidskriftsartikel (refereegranskat)abstract
- During the period 1967-1980 private prospectors recovered 122 molybdenite mineralized samples from Norrbotten and Vsterbotten, northern Sweden, representing acid igneous rocks of intrusive character, including quartz veins, supracrustal rocks of predominantly acid volcanic origin and skarns. The molybdenite occurrences are generally confined to the Proterozoic continental domain north of the Skellefte district. Fifty-six of the molybdenite samples from different rock types were analysed for major elements and 13 trace elements. Tin is, besides molybdenum, the only element enriched in all rock types. The molybdenite mineralized samples are poor in Nb, not enriched in Rb, and show occasionally high concentrations of F and Cu.
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- Öhlander, Björn
(författare)
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Geochemical analyses of rocks of the Haparanda suite, northern Sweden
- 1984
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Ingår i: Geologiska föreningens i Stockholm förhandlingar. - : Informa UK Limited. - 0016-786X. ; 106:2, s. 167-169
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Tidskriftsartikel (refereegranskat)abstract
- Thirteen samples of the primorogenic Haparanda suite (gabbro to granodiorite) in northernmost Sweden were analysed for major elements and the trace elements Rb, Sr, Ba, Cu, Zn, Mo, Sn, Be, Nb, Y, Zr, Cr, Ni, V, F, Cl and S. The results accord with the view that the Haparanda suite is an I-type rock suite generated in a compressional environment. The Sn-content is higher than expected, but Sn, Mo and Be are not enriched in the most silicic samples. The F-content is higher in gabbros and Mo is correlated with Cu.
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| 6. |
- Öhlander, Björn
(författare)
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Proterozoic molybdenite occurrences in northern Sweden : derived from acid volcanics or granites?
- 1984
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Ingår i: Geologiska föreningens i Stockholm förhandlingar. - : Informa UK Limited. - 0016-786X. ; 106:1, s. 67-72
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Tidskriftsartikel (refereegranskat)abstract
- Proterozoic molybdenite occurrences in Sweden are spatially associated with acid volcanics. To test if mineralization is caused by remobilization of molybdenum in such rocks, fifty samples from northern Sweden have been analysed for major elements and 15 trace elements. Volcanics from the mineralized Rappen district and Vidsel area, situated on the Proterozoic continental domain north of the Skellefte district, have lower Mo-contents than the calc-alkaline submarine Skellefte volcanics. It is therefore concluded that acid volcanics are not the source for molybdenum mineralization. The association between molybdenite occurrences and acid volcanics in northern Sweden is tectonic, suggesting that the late orogenic development of the Rappen district and the Vidsel area, characterized by block movements and development of rift systems, is favourable for generation and emplacement of the granites responsible for molybdenite mineralization.
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