| Reference Type | Journal (article/letter/editorial) |
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| Access Rights | Open Access |
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| Title | On the origin and age of hydrothermal thorium-enriched carbonate veins and breccias in the Møre-Trøndelag fault zone, central Norway |
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| Journal | Norsk Geologisk Tidsskrift
[Norwegian Journal of Geology] | ISSN | 0029-196X |
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| Authors | Grønlie, Arne | Author |
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| Torsvik, Trond H. | Author |
| Year | 1969 | Volume | 49 |
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| Issue | 1 |
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| Publisher | Geological Society of Norway |
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| URL | |
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| Download URL | https://njg.geologi.no/images/NJG_articles/NGT_69_1_001-019.pdf+ |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 16854700 | Long-form Identifier | mindat:1:5:16854700:7 |
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| GUID | 0 |
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| Full Reference | Grønlie, Arne, Torsvik, Trond H. (1969) On the origin and age of hydrothermal thorium-enriched carbonate veins and breccias in the Møre-Trøndelag fault zone, central Norway. Norsk Geologisk Tidsskrift [Norwegian Journal of Geology], 49 (1) 1-19 |
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| Plain Text | Grønlie, Arne, Torsvik, Trond H. (1969) On the origin and age of hydrothermal thorium-enriched carbonate veins and breccias in the Møre-Trøndelag fault zone, central Norway. Norsk Geologisk Tidsskrift [Norwegian Journal of Geology], 49 (1) 1-19 |
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| In | (1969) Norsk Geologisk Tidsskrift [Norwegian Journal of Geology] Vol. 49 (1) Geological Society of Norway |
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| Abstract/Notes | Fault-controlled, thorium-enriched carbonate veins of the inner Trondheimsfjord area have been investigated mineralogically and palaeomagnetically in order to provide a time-frame for tectonic and hydrothermal activity within the Møre-Trøndelag Fault Zone (MTFZ). As determined by optical microscopy, SEM and XRD, the red veins and breccias have a mineralogy dominated by quartz, Kfeldspars, iron-carbonates, calcite, fluorite and barytes. The main thorium-containing phase is thorogummite (Th(SiO4)1-x(OH)4x. The hydrothermal fluids which altered host-rocks adjacent to faults and joints changed throughout time. The earliest hydrothermal phase was one of Na-metasomatism, later followed by precipitation of iron-carbonates. Subsequent phases of hydrothermal alteration include a dominant phase of K-metasomatism and a later quartz, calcite and fluorite hydrothermal flux. Locally, veins and breccias are highly thorium-enriched, the average thorium content of analysed samples is 760 ppm, the Th/U-ratio being 28/1. The red veins disclose three remanence components, AI, All and B , the first two being confined to highly radioactive, late-stage, thorium-enriched breccias. The B component is found both in host-rocks and hydrothermally altered veins. The results indicate magmatic and/or hydrothermal activity which we relate to tectonic events during Permian (B ), Late Jurassic/Early Cretaceous (All) and/or Late Cretaceous/Early Tertiary (AI) time. |
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