(Last updated: 15.12.1998)
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Norsk versjon | ||||
| THE ORE DATABASE | |||||
| Occurence 5052 - 011 Steinskaret | |||||
| (Object Id: 192) (Last updated: 15.12.1998) |
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| Location |
| County: | Trøndelag | Municipality: | Leka (5052) |
| Map 1:50000: | Leka (1725-3) | Map 1:250000: | Vega |
| Coordinate system: | EU89-UTM Zone 32 |
| East: | 623040 m. | North: | 7222532 m. |
| Longitude: | 11.6199010 | Latitude: | 65.1034150 |
| Show on map |
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| Resource |
| Resource Type: | Ferroalloys (Cr,Ni,Co,V,Mo,W) | Resource Subtype: | Chromium | |
| Element(s): | Cr |
| Importance |
| Raw material meaning: | Not Assessed (reg. 18.02.2015) |
| Resources and production |
| Activity: | Exploration | Reserves: | ||
| Operating method: | Historical production: |
Operations |
| From - To | Activity | Comments | |
| 1996 - 1996 | Sampling | Company/Institution :NGU/Malmreg. |
Mineralization |
| Era: | Paleozoic | Period: | ||
| Genesis: | Orthomagmatic formation | Form: | Layer | |
| Main texture: | Banded | Min. distribution: | Semi-massive (20-50 % ore minerals) |
| Main grain size: | Fine grained (< 1 mm) | Main alteration: |
| Strike/Dip: | 30 / 70 | Direction: | ||
| Plunge: |
| Stratigraphic classification of host rock |
| Era: | Paleozoic | Period: | Ordovician |
| Province: | Caledonides | |
| Geotec.unit: | ||
| Tectonic complex: | ||
| Igneous complex: | Leka Ophiolite Complex |
| Group: | Formation: |
Mineralogy |
| Relationship | Mineral | Amount | |
| Gangue mineral | Olivine | Major mineral (>10%) | |
| Gangue mineral | Serpentine | Subordinate mineral (1-10%) | |
| Ore mineral | Chromite | Major mineral (>10%) |
Lithology: |
| Relationship | Rock | Origin | |
| Host rock | Dunite | Intrusive Original rock :Dunite |
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| Metamorphic facies :Amphibolite |
Structures |
| Location: | Type: | Orientation(360 gr.): | Relation to min.: | |
| Host rock | Primary layering | Strike/Dip :30 / 70 | Syn-mineralisation ;...Effect :Controls |
Information(s) in free text format |
| Free text |
| Mineraliseringen ble iflg. arkivkort i Bergarkivet funnet i 1871 av K. M. Hauan. Den er blottet SV for Sørå, 150 - 250 m sør for veien, og fulgt mer eller mindre sammenhengende over en strøklengde på ca. 200 m, fra SV-ligste punkt a) til det NØ-ligste b). a) I dunitt er det over en samlet mektighet på 6 - 8 m, spredte mm-cm-mektige kromittbånd. Det rikeste parti er 15 cm mektig hvor kromitt utgjør mer enn 50 % av dunitten (prøve 01), hvor de massive, finkornige kromittbånd er i mm- til 1-2-cm-skala vekslende med mm-bånd av kromitt-impregnert dunitt. Båndingen har retning 30°/70°. Den båndete kromittmineraliseringen fortsetter usammenhengende mot NØ. Båndingen vrir seg endel - dunittlinser veksler med harzburgitt og pyroksenitt. b) Kromittbånding over en mektighet i dunitten på ca. 7 m, hvor det dominerende bilde er: kromittbånd av få mm mektighet alternerende med dunittbånd (svak kromitt-disseminasjon) av mektighet 5 - 10 cm. Det kan imidlertid være tilnærmet kromittfrie bånd av mektighet 10 - 20 cm og det kan være kromittbånding over opptil 20 cm mektighet hvor kromitt dominerer over dunitt. Det opptrer enkelte massive, finkornige kromittbånd (prøve 02) av mektighet opptil 8 - 10 cm. Båndingen har retning 5°/50°. Kromittbåndene er ofte forkastet i cm-skala. |
Bibliography: |
| From NGU's Reference Archive: |
| Prestvik, T. , 1972 |
| Alpine-type mafic and ultramafic rocks of Leka, Nord-Trøndelag. |
| ;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; No.273;23-34 pages |
| Abstract: | |
| Layered rocks of both ultramafic and gabbroic composition are described. The banding is assumed to be of the flow-layering type typical of alpine-type complexes. The gabbroic rocks are both uralitized and saussuritized. Dunitic ultramafite is more or less serpentinized, whereas the pyroxenite layers are quite fresh. This selective or incomplete alteration may be due to lack of water during metamorphism. |
Fieldsamples |
| Sample No. | Sample type | Miscellanrous | ||||
| NT0194.01 | Bedrock |
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| NB! All analyse values are shown at the end of the printout.: |
Name of Locality: Skjerp 1 |
| (Object Id: 448 11,01,00) |
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| Location |
| County: | Trøndelag | Municipality: | Leka (5052) |
| Map 1:50000: | Leka (1725-3) | Map 1:250000: | Vega |
| Coordinate system: | EU89-UTM Zone 32 |
| East: | 623180 m. | North: | 7222692 m. |
| Longitude: | 11.6230200 | Latitude: | 65.1047970 |
| Show on map |
|
|
| Resource |
| Resource Type: | Ferroalloys (Cr,Ni,Co,V,Mo,W) | Resource Subtype: | Chromium | |
| Element(s): | Cr |
| Resources and production |
| Activity: | Pitting | Reserves: | ||
| Operating method: | Historical production: |
Fieldsamples |
| Sample No. | Sample type | Miscellanrous | ||||
| NT0194.02 | Bedrock |
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| NB! All analyse values are shown at the end of the printout.: |
Analyse Results |
| from |
| Deposit Area 5052 - 011 Steinskaret |
Element analyses |
( *=parts pr. million, #=parts pr.billion, Negative values means below detection limit value.) |
| Sample No. | Sample Type | Cu* | Zn* | Pb* | Co* | Ni* | Ag* | Au# |
| NT0194.01 | Bedrock | 111 | -1 | -3 | 26 | 851 | -.3 | 8.0 |
| NT0194.02 | Bedrock | 116 | -1 | -3 | 21 | 803 | -.3 | 8.0 |
| ------------------ |
| Sample No. | Pt# | Pd# | Rh# | As* | Cd* | Ba* | Mo* | Sb* | Bi* |
| NT0194.01 | 7.0 | 4.0 | -1.0 | 3 | -.2 | 2 | -1.00 | -2 | 2 |
| NT0194.02 | 12.0 | 12.0 | 6.0 | 3 | -.2 | -1 | -1.00 | -2 | -2 |
| ------------------ |
| Sample No. | V* | Cr* | Mn* | Fe% | Th* | U* | W* | Sr* | La* |
| NT0194.01 | 4 | 473 | 299 | 1.97 | -2.00 | -5.00 | -2 | 1.0 | -1.00 |
| NT0194.02 | 7 | 698 | 223 | 1.51 | -2.00 | -5.00 | -2 | 1.0 | -1.00 |
| ------------------ |
| Sample No. | B* | ||||||||
| NT0194.01 | 6 | ||||||||
| NT0194.02 | 6 |
| The fact sheet was created on 26.04.2024 |
| Questions or comments regarding the fact sheet can be emailed to: ressursdatabaser@ngu.no |
| Copyright © 2024 Geological Survey of Norway |