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Träfflista för sökning "LAR1:ltu srt2:(1980-1989);srt2:(1985)"

Sökning: LAR1:ltu > (1980-1989) > (1985)

  • Resultat 251-256 av 256
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251.
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252.
  • Öhlander, Björn (författare)
  • Geochemical characteristics of granites associated with Proterozoic molybdenite mineralization in northern Sweden
  • 1985
  • Ingår i: Chemical Geology. - : Elsevier BV. - 0009-2541 .- 1872-6836. ; 51:3-4, s. 247-263
  • Tidskriftsartikel (refereegranskat)abstract
    • Proterozoic molybdenite occurrences in northern Sweden are associated with small plutons of intrusive character located in supracrustal belts whereas large granite areas are barren. In this study, 152 samples of granites associated with molybdenite mineralization, mineralized aplites, granites not known to be associated with molybdenite occurrences but located in supracrustal belts and granites from the large granite areas have been analysed for major elements and the selected trace elements Mo, Sn, Be, Ba, Rb, Sr, Cu, Zn, Zr, V, Y, Nb, F, Cl and S. The study showed that major-element geochemistry and modal composition are not useful for distinguishing between potentially molybdenite-mineralizing and barren granites in northern Sweden. Enriched contents of Sn, Be, Y, Rb and F are most useful for identifying ore-associated granites in the supracrustal belts. The granites from the large granite areas have very low contents of Sn, Mo, Be, Nb, Y, F, Cl and S. It is proposed that the granites associated with molybdenite occurrences were probably generated by partial melting of earlier igneous rocks, or they may be of subcrustal origin, the large granite bodies originated by partial melting of Archean continental crust.
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253.
  • Öhlander, Björn (författare)
  • Geochemistry of Proterozoic molybdenite - mineralized aplites in Northern Sweden
  • 1985
  • Ingår i: Mineralium Deposita. - 0026-4598 .- 1432-1866. ; 20:4, s. 241-248
  • Tidskriftsartikel (refereegranskat)abstract
    • The largest known Precambrian molybdenite occurrences in Sweden are of the aplitic type. In order to improve the understanding of their genesis, 67 samples of aplites, aplitic granites and associated granites were analyzed for major elements, Mo, Sn, Be, Ba, Rb, Sr, Cu, Zn, Zr, V, Cr, Ni, Y, Nb, F, Cl and S. Five samples were analyzed for rare earth elements. The following genetic model can be proposed: In the upper parts of granitic intrusions the magma is enriched in lithophile elements and elements such as F and Mo. The aplites represent direct differentiation products of the granites and have solidified without the development of a second mobile aqueous phase, except locally, where small pegmatite segregations have formed. As crystallization proceeds, the concentration of Mo in the magma increases, and when the aplites solidify, the Mo that cannot be incorporated in the rock-forming minerals is precipitated as molybdenite. Biotite seems to be the major Mo-carrier among the rock-forming minerals in the aplites.
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254.
  • Öhlander, Björn, et al. (författare)
  • Tectonic control of Precambrian molybdenite mineralization in Northern Sweden
  • 1985
  • Ingår i: Economic geology and the bulletin of the Society of Economic Geologists. - : Society of Economic Geologists. - 0361-0128 .- 1554-0774. ; 80:2, s. 505-512
  • Tidskriftsartikel (refereegranskat)abstract
    • The major molybdenite occurrences of N Sweden are mostly confined to the Proterozoic continental domain. The molybdenite occurrences are in aplites, pegmatites and metamorphosed volcanics, located in narrow supracrustal belts surrounding granites. The Mo deposits are associated with faults and dome structures (apical parts of cupolas), as recognized by geophysical methods
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255.
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256.
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