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Norsk versjon | ||||
| THE ORE DATABASE | |||||
| Deposit Area 1663 - 018 | |||||
| (Last updated 04.jul.2023) | |||||
Name of Deposit Area : Venn østre |
| (Object Id : 1663,018,00,00) |
| Location |
| County : | Sør-Trøndelag (16) | Municipality : | Malvik (1663) |
| Map 1:50000: | Stjørdal (1621-1) | Map 1:250000: | Trondheim |
| Marking point: | Longitude: | 10.8771210 | Latitude: | 63.3361420 |
| EU89-UTM Zone 32 | (Coordinates IS confirmed) |
| X-coord: | 593976 m. | Y-coord: | 7024417 m. |
|
|
| Commodity |
| Main Type: | Ferrous metals(Fe, Mn, Ti) | Sub Type: | Iron | |
| Element(s): | Fe |
| Production |
| Activity: | Pitting | Reserves: | ||
| Prod. method: | Production: | |||
| Prod. status: | Volume of dump: | 8 m3 |
| Importance |
| Public: | (No data) |
| Economical: | Not classified/evaluated |
Mineralization |
| Era: | Paleozoic | Period: | Ordovician | |
| Dating: | Method: | |||
| Genesis: | Volcex | Form: | Irregular | |
| Main texture: | Structureless | Min. distribution: | Disseminated (<20 % ore minerals) |
| Main grain size: | Fine grained (< 1 mm) | Main alteration: |
| Strike/Dip: | Direction: | |||
| Plunge: |
| Stratigraphic classification of host rock |
| Era: | Paleozoic | Period: | Ordovician |
| Province: | Caledonides | |
| Geotec.unit: | Trondheim Nappe Complex | |
| Tectonic complex: | ||
| Igneous complex: |
| Group: | Støren Group | Formation: |
Mineralogy |
| Relationship | Mineral | Amount | |
| Gangue mineral | Amphibole | Major mineral (>10%) | |
| Gangue mineral | Plagioclase | Major mineral (>10%) | |
| Gangue mineral | Chlorite | Major mineral (>10%) | |
| Gangue mineral | Epidote | Subordinate mineral (1-10%) | |
| Ore mineral | Magnetite | Major mineral (>10%) |
Lithology: |
| Relationship | Rock | Origin | |
| Host rock | Greenstone | Extrusive Original rock :Basalt |
|
| Metamorphic facies :Greenschist | |||
| Wall rock | Agglomerate | Extrusive Original rock :Agglomerate |
|
| Metamorphic facies :Greenschist |
Structures |
| Location: | Type: | Orientation(360 gr.): | Relation to min.: | |
| Host rock | Foliation | Strike/Dip :285 / 40 | Post-mineralisation ;...Effect :Modifies |
Information(s) in free text format |
| Free text |
| Forekomsten ligger rett nord for gården Venn østre i noe ulendt terreng. Den består av en vann- og gjørmefylt grop som er 5 m langt og 1-1,5 m bredt. I området finnes finkornet grønnstein og agglomerat. Tippen består av blokker med magnetitt- og hematittdisseminasjon i grønnstein. |
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. |
| References not to be found in NGU's Reference Archive.: |
| Bakmark, N. & Rø, G 2014, Jerngruver, natur- og kulturminner i nærheten av Mostadmark jernverk - TURBOK. Mostadmark Jernverks Venner, 144 s. |
Fieldsamples |
| Sample No. | Sample type | Miscellanrous | |||||
| Venn-1 | Dump |
|
| NB! All analyse values are shown at the end of the printout.: |
Analyse Results |
| from |
| Deposit Area 1663 - 018 Venn østre |
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# |
| Venn-1 | Dump | 22 | 80 | 1 | 31 | 119 | -.1 | -.5 |
| ------------------ |
| Sample No. | As* | Cd* | Ba* | Mo* | Sn* | Sb* | Bi* | Se* | Ga* |
| Venn-1 | 2 | -.1 | 85 | 1.10 | 1 | 0 | -0 | -0.50 | 19.00 |
| ------------------ |
| Sample No. | S% | V* | Fe% | Th* | U* | W* | Rb* | Sr* | Y* |
| Venn-1 | -.02 | 202 | 14.14 | 0.30 | 0.70 | -1 | 21.7 | 319.3 | 42.5 |
| ------------------ |
| Sample No. | Zr* | Nb* | Ta* | Cs* | La* | Ce* | Pr* | Nd* | Sm* |
| Venn-1 | 120 | 3.90 | 0.20 | 0.80 | 7.80 | 16.30 | 2.90 | 14.80 | 4.52 |
| ------------------ |
| Sample No. | Eu* | Gd* | Tb* | Dy* | Ho* | Er* | Tm* | Yb* | Lu* |
| Venn-1 | 1.66 | 6.12 | 1.07 | 6.71 | 1.50 | 4.18 | 0.60 | 3.78 | 0.58 |
| ------------------ |
| Sample No. | Be* | P* | Hf* | Hg* | Tl* | ||||
| Venn-1 | -1 | 1091 | 2.90 | -0 | -0 |
Oxide analyses |
( All values are in % ) |
| Sample No. | Sample Type | SiO2 | Al2O3 | TiO2 | Fe2O3 | MnO | MgO | CaO |
| Venn-1 | Dump | 51.53 | 13.94 | 1.55 | 20.21 | 0.08 | 1.60 | 5.31 |
| ------------------ |
| Sample No. | Na2O | K2O | P2O5 | Sum | |||||
| Venn-1 | 4.84 | 0.76 | 0.25 | 100.00 |
| The fact sheet was created on 19.05.2024 |
| Questions or comments regarding the fact sheet can be emailed to: ressursdatabaser@ngu.no |
| Copyright © 2024 Geological Survey of Norway |