(Last updated: 01.07.1998)
|
|
Norsk versjon | ||||
| THE ???? DATABASE | |||||
| Occurence 0 - 000 FEIL | |||||
| (Object Id: ) (Last updated: 01.07.1998) |
|||||
|
|
| Location |
| County: | Municipality: | Mangler () |
| Map 1:50000: | Rennebu (1520-1) | Map 1:250000: | Røros |
| Coordinate system: | UTM-Zone 33 - EUREF89/WGS84 |
| East: | 538320 m. | North: | 6972890 m. |
| Longitude: | 9.7551140 | Latitude: | 62.8843340 |
| Show on map |
|
|
| Resource |
| Resource Type: | Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) | Resource Subtype: | Sulphides | |
| Element(s): | Kis |
| Importance |
| Raw material meaning: | Not Assessed (reg. 18.02.2015) |
| Resources and production |
| Activity: | Pitting | Reserves: | ||
| Operating method: | Historical production: |
Operations |
| From - To | Activity | Comments | |
| 1997 - 1997 | Sampling | Company/Institution :NGU-Malmreg. |
Mineralization |
| Genesis: | Volcex | Form: | Layer | |
| Main texture: | Banded | Min. distribution: | Semi-massive (20-50 % ore minerals) |
| Main grain size: | Fine grained (< 1 mm) | Main alteration: |
| Strike/Dip: | Direction: | 130 | ||
| Plunge: | 20 |
| Stratigraphic classification of host rock |
| Era: | Period: |
| Province: | Caledonides | |
| Geotec.unit: | Blåhø-Surna Nappe Complex | |
| Tectonic complex: | Blåhø Nappe | |
| Igneous complex: |
| Group: | Blåhø | Formation: |
Mineralogy |
| Relationship | Mineral | Amount | |
| Gangue mineral | Quartz | Major mineral (>10%) | |
| Gangue mineral | Feldspar | Subordinate mineral (1-10%) | |
| Gangue mineral | Biotite | Subordinate mineral (1-10%) | |
| Gangue mineral | Amphibole | Subordinate mineral (1-10%) | |
| Gangue mineral | Carbonate | Accessory mineral (<1%) | |
| Ore mineral | Pyrrhotite | Major mineral (>10%) | |
| Ore mineral | Pyrite | Accessory mineral (<1%) | |
| Ore mineral | Chalcopyrite | Accessory mineral (<1%) |
Lithology: |
| Relationship | Rock | Origin | |
| Host rock | Quartzite | Sedimentary Original rock :Exhalite |
|
| Metamorphic facies :Amphibolite | |||
| Wall rock | Garbenschiefer | Extrusive Original rock :Tuff |
|
| Metamorphic facies :Amphibolite | |||
| Wall rock | Amphibole schist | Extrusive Original rock :Tuff |
|
| Metamorphic facies :Amphibolite |
Structures |
| Location: | Type: | Orientation(360 gr.): | Relation to min.: | |
| Host rock | Fold axis | Dir./Plunge :130 / 20 | Post-mineralisation ;...Effect :Modifies |
Information(s) in free text format |
| Description |
| Skjerpet, som er en 10 m lang N-S-gående avblotningsgrop som følger mineraliseringen, ligger 20 m øst for ei hytte ved NV-enden av Hestvatnet. Den stratabundne kismineraliseringen er 20 cm mektig og består av 4 tynne (opptil 5 cm mektige) lag av massiv magnetkis med små (opptil 1 mm) kvartsøyne, og med litt svovelkis og kobberkis mobilisert på hårtynne sprekker, og ellers disseminasjon (til semimassive partier) av magnetkis i kvartsitt og kvarts-feltspatbergart innen den tynne malmsonen (som også fører litt karbonat). Hengbergart er finbladig amfibolskifer med mm-mektige kvartslag og karbonatflekker, mens liggbergart er garbenskifer (kvarts-feltspatgneis med biotittlaminering og store amfibolnåler). I skjerpet følger mineraliseringen ombøyningen i en åpen fold (akse 130/20), hvor lagene dreier fra N-S-strykende med slakt østlig fall til Ø-V-strykende med slakt sørlig fall. Mineraliseringen er ikke blottet utenfor skjerpet. |
Bibliography: |
| From NGU's Reference Archive: |
| Nilsen, Odd , 1988 |
| The tectonostratigraphic setting of stratabound sulphide deposits in the southern Trondheim region, Central Norwegian Caledonides. |
| ;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU Bulletin; No.412;55-66 pages |
| Abstract: | |
| The large number of mainly massive, polymetallic, stratabound sulphide deposits within the southern Trondheim region are spatially confined to the different nappe units of the central Scandinavian Caledonides. The rocks of the parautochthon and Lower Allochthon comprise metasandstones and arkoses which are virtually barren of any sulphide mineralizations, except for a few showings of "sandstone lead" disseminations. The middle and lowermost parts of the upper Allochton are dominated by sediment-hosted chalcopyrite/pyrrhotite assemblages within calcareous mixed peltic and psammitic rocks with minor mafic metavolcanic and plutonic intercalations. The structurally higher Gaula and Støren units of the Trondheim Nappe complex of the upper Allochthon contain chiefly pyrite-dominated assemblages in mafic and mixed mafic/felsic volcanogenic settings and have highly variable Cu, Zn and Pb contents. The stratabound sulphides of the Trondheim region were deposited during successive stages and within restricted sedimentary and volcanosedimentary environments related to development of the lapetus Ocean. Deposition started in basin sediments during Late Proterozoic rifting, but was mainly the result of early subduction and the development of an active island-arc magmatism in the Early Ordovician. The structural and stratigraphical sequences were subsequently affected by Caledonian folding and metamorphism prior to and during eastward transport as composite nappe units in Silurian times. The postdepositional tectonic and metamorphic events have affected the different ores and their wallrocks to various degree as revealed by apparent tectonic control and the internal metamorphic fabric of the deposits. |
Fieldsamples |
| Sample No. | Sample type | Miscellanrous | ||||
| ST0206.01 | Bedrock |
|
| NB! All analyse values are shown at the end of the printout.: |
| The fact sheet was created on 02.05.2024 |
Copyright © 2024 Geological Survey of Norway |