(Last updated: 27.04.2007)
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Norsk versjon | ||||
| THE INDUSTRIAL MINERAL DATABASE | |||||
| Occurence 5034 - 311 Kråkfjellet | |||||
| (Object Id: 17593) (Last updated: 27.04.2007) |
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| Location |
| County: | Trøndelag | Municipality: | Meråker (5034) |
| Map 1:50000: | Feren (1722-2) | Map 1:250000: | Trondheim |
| Coordinate system: | EU89-UTM Zone 32 |
| East: | 644568 m. | North: | 7053615 m. |
| Longitude: | 11.9129010 | Latitude: | 63.5809840 |
| Show on map |
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| Resource |
| Resource Type: | Silica | Resource Subtype: | Hydrothermal quartz |
| Importance |
| Raw material meaning: | Little Importance (reg. 18.02.2015) |
| Resources and production |
| Activity: | Exploration | Reserves: | ,300000011920929 thousand tons | |
| Operating method: | Historical production: |
Operations |
| From - To | Activity | Comments | |
| 2006 - 2006 | Sampling | Company/Institution :NGU | |
| Kvarts prøvetatt for testing av kjemisk renhet med LA-ICP-MS sporelementanalyser. |
Mineralization |
| Era: | Paleozoic | Period: | Silurian | |
| Genesis: | Hydrothermal vein | Form: | Lens | |
| Main texture: | Structureless | Min. distribution: | Massive (>50 % ore minerals) |
| Main grain size: | Coarse grained (> 3 mm) |
| Strike/Dip: | 12 / 40 | Direction: | ||
| Plunge: |
| Stratigraphic classification of host rock |
| Era: | Paleozoic | Period: | Ordovician |
| Province: | Caledonides | |
| Geotec.unit: | Trondheim Nappe Complex | |
| Tectonic complex: | ||
| Igneous complex: |
| Group: | Fundsjø | Formation: |
Mineralogy |
| Mineral | Amount | |
| Quartz | Major mineral (>90%) |
Structures |
| Location: | Type: | Orientation(360 gr.): | Relation to min.: | |
| Host rock | Foliation | Strike/Dip :0 / 80 | Pre-mineralisation ;...Effect :None |
Information(s) in free text format |
| Free text |
| Forekomsten er avmerket på bergrunnskartet Færen (1722-II; Wolff, 1973) innenfor fin- til middelskornete meta-dioritter som intruderer Fundsjøgruppens vulkanitter og subvulkanske intrusiver. Området ble befart med helikopter uten å oppdage noen kvartsforekomst på stedet som var avmerket på kartet. Hvite kvartsmasser ses lett fra helikopter. I området ble bare to små kvartslinser funnet noe høyere opp på fjellryggen enn angitt på kartet. Begge som er 0,5 m tykke og ca. 5 m lange, består av massiv hvit og grovkrystallin kvarts. De gjennomsetter steiltstående grønnskifere og grønnsteiner med tynne ganger av meta-dioritt langs båndingen. Den nedre (644570.7053615) danner en diskordant sub-horisontal kropp, mens den øvre (644570.7053640) er orientert langs den litologiske båndingen. P.M. Ihlen, 25.08.2006 |
| Photo(s) from the Deposit area: |
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Bibliography: |
| From NGU's Reference Archive: |
| Wolff, Fr. Chr. , 1973 |
| Feren. Berggrunnskart; Feren; 17222; 1:50 000; trykt i farger; NGU Skrifter nr.5 |
| ;Norges geologiske undersøkelse;KART |
| Wolff, Fredrik Chr. , 1973 |
| Meråker og Færen. Beskrivelse til de berggrunnsgeologiske kart 1721 I og 1722 II 1:50 000 |
| ;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL; KARTBESKRIVELSE;NGU; Skrifter; No.295; 5;1-42 + ka pages |
| Abstract: | |
| An account of the stratigraphy of the rock series is given and the lithologies are described. The latter comprise gneissose quartzofeldspathic sediments of probable Eocambrian age and Palaeozoic metasupracrustals and intrusives of the "Trondheim nappe". Some of these intrusives represent shallow bodies emplaced contemporaneously with the volcanic activity in Ordovician time, while others date to the main Caledonian period of deformation. More than 80 chemical silicate analyses accompany the description of the rocks. The rocks have undergone at least three phases of Caledonian folding. The supracrustal picture is dominated by the general inversion, which relates to the overturning of the eastern limb of a fan-shaped anticline encompassing this part of the Caledonian mountain chain. An increasing metamorphism, ranging from lower greenschist to higher almandine amphibolite facies, is recorded from southeast to northwest across the two map sheets. Finally, comments are given on ore-mineral occurrences. Two earomagnetic survey maps (on the scale 1:50 000) accompany the description. |
Fieldsamples |
| Sample No. | Sample type | Miscellanrous | ||||
| 38454 | Bedrock |
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| NB! All analyse values are shown at the end of the printout.: |
Analyse Results |
| from |
| Deposit Area 5034 - 311 Kråkfjellet |
Mineral analyses |
( All values are in ppm. Negative values means below detection limit value.) |
| Sample No. | Sample Type | Mineral | Li | B | Na |
| 38454 | Bedrock | Quartz | 2.200 | 2.100 | -22.200 |
| 38454 | Bedrock | Quartz | -1.500 | -1.400 | -22.200 |
| ------------------ |
| Sample No. | Al | P | K | Ca | Ti | Mn | Fe | Ge | Rb |
| 38454 | 9.100 | -7.200 | -12.100 | -32.700 | 2.400 | -.400 | -.800 | .400 | .050 |
| 38454 | 11.900 | -7.200 | -12.100 | -32.700 | 2.500 | -.400 | -.800 | 1.100 | .090 |
| ------------------ |
| Sample No. | Sr | Ba | |||||||
| 38454 | -.050 | -.020 | |||||||
| 38454 | .080 | .040 |
| The fact sheet was created on 06.05.2024 |
| Questions or comments regarding the fact sheet can be emailed to: ressursdatabaser@ngu.no |
| Copyright © 2024 Geological Survey of Norway |