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English version | ||||
| MALMDATABASEN | |||||
| Forekomstområde 1201 - 015 | |||||
| (Sist oppdatert 25.jan.2024) | |||||
Navn på deposit area : Trengereid |
| (Objekt Id : 1201,015,00,00) |
| Lokalisering |
| Fylke : | Hordaland (12) | Kommune : | Bergen (1201) |
| Kart 1:50000: | Bruvik (1215-4) | Kart 1:250000: | Bergen |
| Markeringspunkt: | Lengdegrad: | 5.6071290 | Breddegrad: | 60.4208370 |
| EU89-UTM Zone 32 |
| X-koord: | 313218 m. | Y-koord: | 6703092 m. |
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| Materialtype |
| Hovedtype: | Jernlegeringsmetaller (Cr,Ni,Co,V,Mo,W) | Subtype: | Nikkel | |
| Element(s): | Ni Cu |
| Betydning |
| Offentlig: | Little Importance (reg. 18.02.2015) |
| Economical: | Lite viktig , (Confirmed 15.feb.2005 by Lars Petter Nilsson) |
Mineralization |
| Era: | Paleozoic | Period: | Ordovician | |
| Dating: | Method: | |||
| Genesis: | Form: | |||
| Main texture: | Min. distribution: |
| Main grain size: | Main alteration: |
| Strike/Dip: | Direction: | |||
| Plunge: |
| Stratigraphic classification of host rock |
| Era: | Paleozoic | Period: | Ordovician |
| Province: | Caledonides | |
| Geotec.unit: | Hardangerfjord Nappe Complex | |
| Tectonic complex: | ||
| Igneous complex: | Gulfjell Ophiolite Complex |
| Group: | Formation: |
Opplysning(er) i fritekstformat |
| Fri tekst |
| Den eventuelle Ni-mineraliseringen plotter i dag sentralt i et større kalksteinsbrudd (Risnes) og må være feil-lokalisert. |
Bibliography: |
| From NGU's Reference Archive: |
| Ragnhildstveit, J.; Naterstad, J. , 1993 |
| Samnanger. Berggrunnskart; Samnanger; 12154; 1:50 000; sort/hvitt; |
| ;Norges geologiske undersøkelse;KART |
| Heskestad, Britt; Hofshagen, Nina H.; Furnes, Harald; Pedersen, Rolf-Birger , 1994 |
| The geochemical evolution of the Gulfjellet Ophiolite Complex, west Norwegian Caledonides |
| ;Norsk geologisk forening;TIDSSKRIFTARTIKKEL;Norsk geologisk tidsskrift; No.74 (2);77-88 pages |
| Abstract: | |
| The earliest (N-S to NE-SW striking) dykes and pillow lavas of the Lower Ordovician Gulfjellet Ophiolite Complex are dominated by N-MORB to IAT-types affinities, the IAT-type seems to become more abundant with time. This development is thought to reflect spreading-related magmatism is a 'supra-subduction' zone environment. Boninitic magmatism, represented by dominantly NE-SW to E-W trending dykes, post-dates the N-MORB and IAT, and suggests formation in a fore-arc setting. The occurr- ence of a few MORB-type dykes cutting boninite dykes may indicate formation of new oceanic crust, possibly associated with arc splitting. The rare occur- rence of post-MORB calc-alkalice magmatic activity may indicate a maturing stage of arc magmatic activity. |
| Faktaarket ble generert 19.06.2026 |
| Spørsmål eller kommentarer vedrørende faktaarket kan mailes til: ressursdatabaser@ngu.no |
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