Norsk versjon | |||||
THE ???? DATABASE | |||||
Occurence 0 - 000 FEIL | |||||
(Object Id: ) (Last updated: 04.07.2023) |
|
Location |
County: | Municipality: | Mangler () |
Map 1:50000: | Stjørdal (1621-1) | Map 1:250000: | Trondheim |
County: | UTM-Zone 33 - EUREF89/WGS84 |
|
Resource |
Resource Type: | Ferrous metals(Fe, Mn, Ti) | Resource Subtype: | Iron | |
Element(s): | Fe |
Importance |
Raw material meaning: | (No data) |
Resources and production |
Activity: | Pitting | Reserves: | ||
Operating method: | Historical production: |
Mineralization |
Era: | Paleozoic | Period: | Ordovician | |
Genesis: | Volcex | Form: | Layer | |
Main texture: | Banded | Min. distribution: | Disseminated (<20 % ore minerals) |
Main grain size: | Fine grained (< 1 mm) | Main alteration: |
Strike/Dip: | 320 / 70 | Direction: | ||
Plunge: |
Stratigraphic classification of host rock |
Era: | Paleozoic | Period: | Ordovician |
Province: | Caledonides | |
Geotec.unit: | Trondheim Nappe Complex | |
Tectonic complex: | ||
Igneous complex: |
Group: | Støre Group | Formation: |
Mineralogy |
Relationship | Mineral | Amount | |
Gangue mineral | Quartz | Major mineral (>10%) | |
Ore mineral | Hematite | Major mineral (>10%) | |
Ore mineral | Magnetite | Subordinate mineral (1-10%) |
Lithology: |
Relationship | Rock | Origin | |
Host rock | Jasper | Sedimentary Original rock :Exhalite |
|
Metamorphic facies :Greenschist | |||
Wall rock | Greenschist | Extrusive Original rock :Basalt |
|
Metamorphic facies :Greenschist |
Structures |
Location: | Type: | Orientation(360 gr.): | Relation to min.: | |
Wall rock | Schistosity | Strike/Dip :320 / 70 | Post-mineralisation ;...Effect :Modifies |
Information(s) in free text format |
Free text |
Flåkåmyra ligger på nordsida av Lauvdalen og en bomvei kan følges fra Selbuveien og ca. 1,5 km innover dalen. En ca. 12 m lang, gjengrodd dagskjæring med retning 60° fører fram til en blotning med en minst 1,5 m mektig jaspis med hematitt innerst i skjæringa. Over denne finnes grønnskifer. Mindre blotninger av jaspis og grønnskifer finnes også ellers i skjæringa. Prøver av fast fjell og fra tippen gir bare lave jernverdier (< 6 % Fe2O3). |
Bibliography: |
From NGU's Reference Archive: |
Torske, Tore , 1965 |
Geology of the Mostadmarka and Selbustrand area, Trøndelag. |
;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; No.232;1-83 + ka pages |
Abstract: | |
The bedrock of the area consists of metamorphic epiclastic, volcanic, and intrusive rocks of assumed Lower Ordovician age, assigned to, and lithologically matching the rocks of, the Røros, Støren and Lower Hovin Groups of the Trondheim Region. A detailed petrographic description of the rock varieties is given. The metamorphic grade of all rocks corresponds to the Greenschist Facies. - Small ore deposits occur in connection with the volcanic rocks. They comprise pyrite-pyrrhotite ores of the Leksdal Type, mixed pyrite-magnetite ores, and iron oxide ores. - Lithological variations of the sedimentary rocks is tentatively correlated with events during the early periods of the Caledonian Orogeny. - The volcanism within the area seems to have started with a phase of explosive activity, followed by extrusion (mostly submarine) of copious amounts of spilitic lavas; towards the end of the main period of volcanism a new episode of explosive activity has produced what is called the upper pyroclastic horizon, comprising rocks ranging from coarse volcanic breccia to finegrained tuffs. - The intrusive rocks consist mainly of saussurite gabbros and quartz keratophyres. The latter are thought to be intrusive rather than effusive, and evidence is offered to support this. In some places the character of pyroclastic material points to a quartz keratophyre parentage. Thus, quartz keratophyres may have occurred both as intrusive and volcanic rocks. |
Fieldsamples |
Sample No. | Sample type | Miscellanrous | |||||
Flåkåmyra-1 | Bedrock |
|
|||||
Flåkåmyra-2 | Dump |
|
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 |