Norsk versjon
THE NATURAL STONE DATABASE
Occurence 301 - 604 Blanksjø 1
(Object Id: 15425)
(Last updated: 08.06.2012)

Location
County: Oslo Municipality: Oslo (301)
Map 1:50000: Oslo (1914-4) Map 1:250000: Oslo
Coordinate system: EU89-UTM Zone 32
East: 596850 m. North: 6650590 m.
Longitude: 10.7355070 Latitude: 59.9812210
Show on map

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 24.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
Dette er et større bruddområde med en vannfylt synk midt i området. Ellers er maksimal avsenkning 1 m. Bergarten er grefsensyenitt.
Location
Forekomsten ligger ca. 100 m vest for nedre Blanksjø i veiløst skogsterreng.

Photo(s) from the Deposit area:
Photo no. 1 showing Bruddområde"

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: Blanksjø 2
(Object Id: 15428 604,01,00)

Location
County: Oslo Municipality: Oslo (301)
Map 1:50000: Oslo (1914-4) Map 1:250000: Oslo
Coordinate system: EU89-UTM Zone 32
East: 597050 m. North: 6650580 m.
Longitude: 10.7390840 Latitude: 59.9810840
Show on map

Resource
Resource Type: Granite and other igneous rocks Resource Subtype: Syenite
Brickstone(Y/N):
Importance
Historical: Yes , (Confirmed 24.sep.2004 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 flere ca. 1 m høye benker i syenitten. Relativt stort bruddområde med mye utbrutt blokk.
Location
Dette er et bruddområde like øst for nedre Blanksjø og vest for vei fra parkeringsplass sør for Sognsvann.

Photo(s) from the Deposit area:
Photo no. 1 showing Bruddoråde like øst for nedre Blanksjø"

Name of Locality: Blanksjø 3
(Object Id: 15430 604,02,00)

Location
County: Oslo Municipality: Oslo (301)
Map 1:50000: Oslo (1914-4) Map 1:250000: Oslo
Coordinate system: EU89-UTM Zone 32
East: 596990 m. North: 6650529 m.
Longitude: 10.7379860 Latitude: 59.9806490
Show on map

Resource
Resource Type: Granite and other igneous rocks Resource Subtype: Syenite
Brickstone(Y/N):
Importance
Historical: Yes , (Confirmed 24.sep.2004 by Leif Furuhaug)

Resources and production
Activity: Stone quarrying Reserves:
Operating method: Open pit mining Historical production:


Information(s) in free text format
Description
Lite brudd vest for nedre Blanksjø.

Photo(s) from the Deposit area:
Photo no. 1 showing Lite brudd"

Name of Locality: Blanksjø 4
(Object Id: 15432 604,03,00)

Location
County: Oslo Municipality: Oslo (301)
Map 1:50000: Oslo (1914-4) Map 1:250000: Oslo
Coordinate system: EU89-UTM Zone 32
East: 596927 m. North: 6650488 m.
Longitude: 10.7368380 Latitude: 59.9802880
Show on map

Resource
Resource Type: Granite and other igneous rocks Resource Subtype: Syenite
Brickstone(Y/N):
Importance
Historical: Yes , (Confirmed 24.sep.2004 by Leif Furuhaug)

Resources and production
Activity: Stone quarrying Reserves:
Operating method: Open pit mining Historical production:


Information(s) in free text format
Description
Middels stort brudd til oslomarka å være. Det er brutt på et par benker i syenitten over en lengde på ca. 50 m.
Location
Brudd beliggende vest for nedre Blanksjø og sørvest for Blanksjø vest 1.

Photo(s) from the Deposit area:
Photo no. 1 showing Bruddområde"

Name of Locality: Blanksjø 5
(Object Id: 15434 604,04,00)

Location
County: Oslo Municipality: Oslo (301)
Map 1:50000: Oslo (1914-4) Map 1:250000: Oslo
Coordinate system: EU89-UTM Zone 32
East: 596939 m. North: 6650660 m.
Longitude: 10.7371510 Latitude: 59.9818280
Show on map

Resource
Resource Type: Granite and other igneous rocks Resource Subtype: Syenite
Brickstone(Y/N):
Importance
Historical: Yes , (Confirmed 24.sep.2004 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 brutt stein over et område på 30 m x 40 m og maksimal avsenkning er 1 m.
Location
Bruddområdet ligger nordvest for nedre Blanksjø.

Photo(s) from the Deposit area:
Photo no. 1 showing Bruddområde"

Name of Locality: Blanksjø 6
(Object Id: 15436 604,05,00)

Location
County: Oslo Municipality: Oslo (301)
Map 1:50000: Oslo (1914-4) Map 1:250000: Oslo
Coordinate system: EU89-UTM Zone 32
East: 596900 m. North: 6650730 m.
Longitude: 10.7364680 Latitude: 59.9824660
Show on map

Resource
Resource Type: Granite and other igneous rocks Resource Subtype: Syenite
Brickstone(Y/N):
Importance
Historical: Yes , (Confirmed 24.sep.2004 by Leif Furuhaug)

Resources and production
Activity: Stone quarrying Reserves:
Operating method: Open pit mining Historical production:


Information(s) in free text format
Description
Bruddområdet er ganske stort. Storparten av området har ca. 1 m avsenkning, men ett område er drevet 7-8 m ned i terrenget (se bilde). Sannsynligvis produksjon av gatesten her,- bare småstein ligger igjen etter tilhoggingen.
Location
Bruddet ligger i veiløst terreng nord for nedre Blanksjø.

Photo(s) from the Deposit area:
Photo no. 1 showing Bruddet"

Name of Locality: Blanksjø 7
(Object Id: 15438 604,06,00)

Location
County: Oslo Municipality: Oslo (301)
Map 1:50000: Oslo (1914-4) Map 1:250000: Oslo
Coordinate system: EU89-UTM Zone 32
East: 596799 m. North: 6650790 m.
Longitude: 10.7347050 Latitude: 59.9830280
Show on map

Resource
Resource Type: Granite and other igneous rocks Resource Subtype: Syenite
Brickstone(Y/N):
Importance
Historical: Yes , (Confirmed 24.sep.2004 by Leif Furuhaug)

Resources and production
Activity: Stone quarrying Reserves:
Operating method: Open pit mining Historical production:


Information(s) in free text format
Description
Også et brudd nord for nedre Blanksjø hvor en god del stein er tatt ut. Største avsenkning 4-5 m. Vraksteinen i bruddet tyder på produksjon av gatesten her også.

Photo(s) from the Deposit area:
Photo no. 1 showing Bruddet"


The fact sheet was created on 08.12.2021

Questions or comments regarding the fact sheet can be emailed to:
ressursdatabaser@ngu.no
Copyright © 2021 Geological Survey of Norway