| Reference Type | Journal (article/letter/editorial) |
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| Title | En eksotisk pegmatitt i kambrosiluren ved Eikeren, Buskerud
[An unusual pegmatite from the Eikeren area, South-eastern Norway - a preliminary report] |
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| Journal | STEIN. Nordisk magasin for populær geologi |
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| Authors | Hurum, Jørn H. | Author |
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| Jahren, J. | Author |
| Berg, Hans-Jørgen | Author |
| Bjerkgaard, T. | Author |
| Year | 1997 | Volume | 24 |
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| Issue | 3 |
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| Publisher | Norske Amatørgeologers Sammenslutning |
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| Download URL | http://www.nags.net/Stein/1997/1997-3_Hurum_et_al.pdf |
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| Languages | Norwegian |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 695981 | Long-form Identifier | mindat:1:5:695981:8 |
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| GUID | 0 |
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| Full Reference | Hurum, Jørn H., Jahren, J., Berg, Hans-Jørgen, Bjerkgaard, T. (1997) En eksotisk pegmatitt i kambrosiluren ved Eikeren, Buskerud [An unusual pegmatite from the Eikeren area, South-eastern Norway - a preliminary report], in Kongsberg Mineralsymposium 1997. STEIN. Nordisk magasin for populær geologi, 24 (3) 125-127 |
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| Plain Text | Hurum, Jørn H., Jahren, J., Berg, Hans-Jørgen, Bjerkgaard, T. (1997) En eksotisk pegmatitt i kambrosiluren ved Eikeren, Buskerud [An unusual pegmatite from the Eikeren area, South-eastern Norway - a preliminary report], in Kongsberg Mineralsymposium 1997. STEIN. Nordisk magasin for populær geologi, 24 (3) 125-127 |
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| In | (1997) Kongsberg Mineralsymposium 1997. STEIN. Nordisk magasin for populær geologi Vol. 24 (3) Norske Amatørgeologers Sammenslutning |
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| Abstract/Notes | During a mapping course organized by the Geological Institute, University of Oslo led by Jens Jahren and Jørn H. Hunnn in the Eikeren area, Buskerud, a small pegmatite with some unusual traits were discovered. The pegmatite is found as a sill intruded into the Fossum formation and measuring only 6m x 0.3m. There are several ekerite pegmatites in the area (consisting mainly of feldspar, quartz and aegirine), but as far as we have managed to observe, all of them are dykes and intruding the Fossum, Steinvika, Venstøp and Herøya formations. The most likely source for the pegmatite is the ekerite. The Eikeren ekerite has been dated to 271± 1 Ma (Rasmussen et al. 1988) and represents some of the latest igneous activity in the southern part of the Oslo Rift (Neumann et al. 1990). The pegmatite consists of a corse-grained, subhedral, green microcline feldspar (amazonite), quartz and helvite. There are several fragments of metamorphic cambro-silurian rocks. Accessory minerals are phenakite, Iöllingite, danburite, fluorite, zircon, ?astrophyllite, biotite, ?columbite and hydrocarbon. The amazonite is probably a late hydrothermal alteration of an ekerite-pegmatite with red microcline. |
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