Norsk versjon | |||||
THE NATURAL STONE DATABASE | |||||
Occurence 301 - 617 Ravnkollen 1 | |||||
(Object Id: 15512) (Last updated: 16.02.2010) |
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Location |
County: | Oslo | Municipality: | Oslo (301) |
Map 1:50000: | Oslo (1914-4) | Map 1:250000: | Oslo |
Coordinate system: | EU89-UTM Zone 32 |
East: | 605339 m. | North: | 6649050 m. |
Longitude: | 10.8867640 | Latitude: | 59.9653140 |
Show on map |
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Resource |
Resource Type: | Granite and other igneous rocks | Resource Subtype: | Syenite | |
Brickstone(Y/N): | N |
Importance |
Raw material meaning: | Little Importance (reg. 18.02.2015) |
Historical: | Yes , (Confirmed 29.sep.2004 by Leif Furuhaug) |
Resources and production |
Activity: | Stone quarrying | Reserves: | ||
Operating method: | Open pit mining | Historical production: |
Deposit rock |
Lithology: | Weathering colour: | |||
Genesis: | Form: | |||
Main texture: |
Main grain size: | Main alteration: |
Strike/Dip: | Direction: | |||
Plunge: |
Stratigraphic classification of host rock |
Era: | Period: |
Province: | ||
Geotec.unit: | ||
Tectonic complex: | ||
Igneous complex: |
Group: | Formation: |
Information(s) in free text format |
Description |
Det er brutt ut stein over et større område på platået på toppen av Ravnkollen. Total lengde er 220 m. Det er brutt stein på omtrent hele denne strekningen, men avsenkningen er stort sett mindre enn 1 m. På et mindre område på 10 m x 10 m er det gått lenger ned, avsenkningen er her 3 m. |
Location |
Flere mindre brudd på toppen av Ravnekollen. |
Photo(s) from the Deposit area: |
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Bibliography: |
From NGU's Reference Archive: |
Oxaal, John , 1916 |
Norsk granit |
;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; No.76;1-220 pages |
Abstract: | |
This work is a report of granite and the granite industry in Norway. It contains a description of the various fields of granite and similar rocks from a scientific as well as from a technical and economical standpoint. The geological occurrence of the various rocks, their chemical and mineralogical composition, are thoruoughlyoughly treated, also the questions of practical interest, as the quality and other technical properties, further the problems of location and conditions for transport, conditions for quarrying and otherquestions of interest in the utilization of the various occurrences of granite. Granite: This chapter consideres first the mineralogical and chemical composition of the granite, and the various types of granite resulting from the varying composition; thereafter the most important structural types and how these are dependent on the geological appearance of the rock. Lakkolites and other froms assumed by granite masses when injected into the crust of the earth, are mentioned; some examples of beautifully formed lakkolites are also mentioned. The question of sheet structure and rift in the granite are of great importance in its utilization, and are of interest both practically and theoretically. |
Name of Locality: Ravnkollen 2 |
(Object Id: 20442 617,01,00) |
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Location |
County: | Oslo | Municipality: | Oslo (301) |
Map 1:50000: | Oslo (1914-4) | Map 1:250000: | Oslo |
Coordinate system: | EU89-UTM Zone 32 |
East: | 605350 m. | North: | 6648870 m. |
Longitude: | 10.8868520 | Latitude: | 59.9636960 |
Show on map |
|
Resource |
Resource Type: | Granite and other igneous rocks | Resource Subtype: | Syenite | |
Brickstone(Y/N): |
Importance |
Historical: | Yes , (Confirmed 09.feb.2010 by Leif Furuhaug) |
Resources and production |
Activity: | Stone quarrying | Reserves: | ||
Operating method: | Open pit mining | Historical production: |
Information(s) in free text format |
Description |
Størrelsen på det opprinnelige bruddet er umulig å anslå da det i dag er begravd av rasmasse. Det er fremdeles stor rasfare nær inntil bebyggelse her. Bruddet var drevet til ca. 1960, de siste årene som pukkverk. |
Location |
Bruddet ligger i nordøstre ende av bebyggelsen på Ammerud rett under en stupbratt fjellside fra Ravnekollen. |
Photo(s) from the Deposit area: |
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Name of Locality: Ravnkollen 3 |
(Object Id: 20443 617,02,00) |
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Location |
County: | Oslo | Municipality: | Oslo (301) |
Map 1:50000: | Oslo (1914-4) | Map 1:250000: | Oslo |
Coordinate system: | EU89-UTM Zone 32 |
East: | 605418 m. | North: | 6648769 m. |
Longitude: | 10.8880350 | Latitude: | 59.9627720 |
Show on map |
|
Resource |
Resource Type: | Granite and other igneous rocks | Resource Subtype: | Syenite | |
Brickstone(Y/N): |
Importance |
Historical: | Yes , (Confirmed 09.feb.2010 by Leif Furuhaug) |
Resources and production |
Activity: | Stone quarrying | Reserves: | ||
Operating method: | Open pit mining | Historical production: |
Information(s) in free text format |
Description |
Det er her brutt på en groruditt-gang. Bergarten er i sammensetning en granitt, men ser helt annerledes ut (mørk grønn). I steinalderen ble groruditt brukt som erstatning for flint som ikke fantes her i landet. Groruditten er solid og har skarpe kanter, og egnet seg derfor til å lage redskaper av. Derfor har vi mistanke om at dette er et meget gammelt brudd fra vikingetiden. |
Location |
Bruddet ligger helt syd på Ravnekollen. En vei tar av fra hovedveien til Romsås mot vest og går opp mot Ravnkollen. Bruddet ligger like etter der denne veien tar av. |
Photo(s) from the Deposit area: |
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Name of Locality: Ravnkollen 4 |
(Object Id: 20444 617,03,00) |
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Location |
County: | Oslo | Municipality: | Oslo (301) |
Map 1:50000: | Oslo (1914-4) | Map 1:250000: | Oslo |
Coordinate system: | EU89-UTM Zone 32 |
East: | 605449 m. | North: | 6648659 m. |
Longitude: | 10.8885160 | Latitude: | 59.9617770 |
Show on map |
|
Resource |
Resource Type: | Granite and other igneous rocks | Resource Subtype: | Syenite | |
Brickstone(Y/N): |
Resources and production |
Activity: | Stone quarrying | Reserves: | ||
Operating method: | Open pit mining | Historical production: |
Information(s) in free text format |
Description |
Størrelsen er ca. 10 m x 10 m og 5 m avsenkning. Bruddet ligger i en bratt skrent, og mye stor blokk er rast ned i bunnen. |
Location |
Bruddet er beliggende lengst sør på Ravnekollen øst for Ammerud. |
Photo(s) from the Deposit area: |
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The fact sheet was created on 19.04.2024 |
Questions or comments regarding the fact sheet can be emailed to: ressursdatabaser@ngu.no |
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