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Torfajökull Caldera, Rangárþing ytra, Southern Region, Icelandi
Regional Level Types
Torfajökull CalderaCaldera
Rangárþing ytraMunicipality
Southern RegionRegion
IcelandCountry

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Latitude & Longitude (WGS84):
63° 53' 39'' North , 19° 0' 37'' West
Latitude & Longitude (decimal):
63.89417,-19.01028
GRN:
N43W07
Type:
Caldera
Köppen climate type:
ET : Tundra
Nearest Settlements:
PlacePopulationDistance
Vík í Mýrdal276 (2016)52.8km
Mindat Locality ID:
283178
Long-form identifier:
mindat:1:2:283178:0
GUID (UUID V4):
0
Other Languages:
View 1 more...
Icelandic:
Torfajökull, Rangárþing ytra, Suðurland, Ísland


It covers an area over 400 km² and is the largest occurrence of silicic rocks in Iceland (Macdonald et al. 1990; Martin & Sigmarsson 2007). The occurrence is dominated by rhyolites, which form 9 lava fields covering 32 km² (Macdonald et al. 1990) as well as lava domes (Gunnarsson et al. 1998).

The greater part of the rhyolitic extrusives are over 10 ka in age, with lesser areas of post-glacial silicic, basaltic and intermediate lavas (Gunnarsson et al. 1998).

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List


6 valid minerals.

Rock Types Recorded


Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

ⓘ Aegirine-augite
Formula: (NaaCabFe2+cMgd)(Fe3+eAlfFe2+gMgh)Si2O6
ⓘ 'Alkali Feldspar'
ⓘ 'Amphibole Supergroup'
Formula: AB2C5(T8O22)W2
ⓘ 'Apatite'
Formula: Ca5(PO4)3A
ⓘ Augite
Formula: (CaxMgyFez)(Mgy1Fez1)Si2O6
ⓘ Augite var. Ferroaugite
Formula: (CaxMgyFez)(Mgy1Fez1)Si2O6
ⓘ Augite var. Ferrohedenbergite
Formula: (Ca,Mg,Fe)(Fe,Mg)Si2O6
ⓘ 'Biotite'
Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
ⓘ 'Fayalite-Forsterite Series'
ⓘ Magnetite
Formula: Fe2+Fe3+2O4
ⓘ Magnetite var. Titanium-bearing Magnetite
Formula: Fe2+(Fe3+,Ti)2O4
ⓘ 'Microperthite'
ⓘ 'Plagioclase'
Formula: (Na,Ca)[(Si,Al)AlSi2]O8
ⓘ Quartz
Formula: SiO2
ⓘ Riebeckite
Formula: ◻Na2(Fe2+3Fe3+2)Si8O22(OH)2
ⓘ Zircon
Formula: Zr(SiO4)

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
ⓘMagnetite4.BB.05Fe2+Fe3+2O4
ⓘvar. Titanium-bearing Magnetite4.BB.05Fe2+(Fe3+,Ti)2O4
ⓘQuartz4.DA.05SiO2
Group 9 - Silicates
ⓘZircon9.AD.30Zr(SiO4)
ⓘAugite9.DA.15(CaxMgyFez)(Mgy1Fez1)Si2O6
ⓘvar. Ferroaugite9.DA.15(CaxMgyFez)(Mgy1Fez1)Si2O6
ⓘvar. Ferrohedenbergite9.DA.15(Ca,Mg,Fe)(Fe,Mg)Si2O6
ⓘAegirine-augite9.DA.20(NaaCabFe2+cMgd)(Fe3+eAlfFe2+gMgh)Si2O6
ⓘRiebeckite9.DE.25◻Na2(Fe2+3Fe3+2)Si8O22(OH)2
Unclassified
ⓘ'Alkali Feldspar'-
ⓘ'Amphibole Supergroup'-AB2C5(T8O22)W2
ⓘ'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
ⓘ'Fayalite-Forsterite Series'-
ⓘ'Plagioclase'-(Na,Ca)[(Si,Al)AlSi2]O8
ⓘ'Microperthite'-
ⓘ'Apatite'-Ca5(PO4)3A

List of minerals for each chemical element

HHydrogen
Hⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Hⓘ Riebeckite◻Na2(Fe32+Fe23+)Si8O22(OH)2
OOxygen
Oⓘ Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
Oⓘ Amphibole SupergroupAB2C5(T8O22)W2
Oⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Oⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Oⓘ MagnetiteFe2+Fe23+O4
Oⓘ QuartzSiO2
Oⓘ Riebeckite◻Na2(Fe32+Fe23+)Si8O22(OH)2
Oⓘ Magnetite var. Titanium-bearing MagnetiteFe2+(Fe3+,Ti)2O4
Oⓘ ZirconZr(SiO4)
Oⓘ Fayalite-Forsterite Series
Oⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
Oⓘ ApatiteCa5(PO4)3A
Oⓘ Augite var. Ferroaugite(CaxMgyFez)(Mgy1Fez1)Si2O6
Oⓘ Augite var. Ferrohedenbergite(Ca,Mg,Fe)(Fe,Mg)Si2O6
FFluorine
Fⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
NaSodium
Naⓘ Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
Naⓘ Riebeckite◻Na2(Fe32+Fe23+)Si8O22(OH)2
Naⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
MgMagnesium
Mgⓘ Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
Mgⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Mgⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Mgⓘ Fayalite-Forsterite Series
Mgⓘ Augite var. Ferroaugite(CaxMgyFez)(Mgy1Fez1)Si2O6
Mgⓘ Augite var. Ferrohedenbergite(Ca,Mg,Fe)(Fe,Mg)Si2O6
AlAluminium
Alⓘ Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
Alⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Alⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
SiSilicon
Siⓘ Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
Siⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Siⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Siⓘ QuartzSiO2
Siⓘ Riebeckite◻Na2(Fe32+Fe23+)Si8O22(OH)2
Siⓘ ZirconZr(SiO4)
Siⓘ Fayalite-Forsterite Series
Siⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
Siⓘ Augite var. Ferroaugite(CaxMgyFez)(Mgy1Fez1)Si2O6
Siⓘ Augite var. Ferrohedenbergite(Ca,Mg,Fe)(Fe,Mg)Si2O6
PPhosphorus
Pⓘ ApatiteCa5(PO4)3A
KPotassium
Kⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
CaCalcium
Caⓘ Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
Caⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Caⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
Caⓘ ApatiteCa5(PO4)3A
Caⓘ Augite var. Ferroaugite(CaxMgyFez)(Mgy1Fez1)Si2O6
Caⓘ Augite var. Ferrohedenbergite(Ca,Mg,Fe)(Fe,Mg)Si2O6
TiTitanium
Tiⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Tiⓘ Magnetite var. Titanium-bearing MagnetiteFe2+(Fe3+,Ti)2O4
FeIron
Feⓘ Aegirine-augite(NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6
Feⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Feⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Feⓘ MagnetiteFe2+Fe23+O4
Feⓘ Riebeckite◻Na2(Fe32+Fe23+)Si8O22(OH)2
Feⓘ Magnetite var. Titanium-bearing MagnetiteFe2+(Fe3+,Ti)2O4
Feⓘ Fayalite-Forsterite Series
Feⓘ Augite var. Ferroaugite(CaxMgyFez)(Mgy1Fez1)Si2O6
Feⓘ Augite var. Ferrohedenbergite(Ca,Mg,Fe)(Fe,Mg)Si2O6
ZrZirconium
Zrⓘ ZirconZr(SiO4)

Other Databases

Wikipedia:https://en.wikipedia.org/wiki/Torfaj%C3%B6kull
Wikidata ID:Q1474799

Other Regions, Features and Areas containing this locality

Eurasian PlateTectonic Plate
EuropeContinent
North America Plate

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References

MACDONALD, R., McGARVIE, D. W., PINKERTON, H., SMITH, R. L., PALACZ, A. (1990) Petrogenetic Evolution of the Torfaj kull Volcanic Complex, Iceland I. Relationship Between the Magma Types. Journal of Petrology, 31 (2) 429-459 doi:10.1093/petrology/31.2.429
Gunnarsson, Björn, Marsh, Bruce D., Taylor, Hugh P. (1998) Generation of Icelandic rhyolites: silicic lavas from the Torfajökull central volcano. Journal of Volcanology and Geothermal Research, 83 (1) 1-45 doi:10.1016/s0377-0273(98)00017-1
Martin, E., Sigmarsson, O. (2007) Crustal thermal state and origin of silicic magma in Iceland: the case of Torfajökull, Ljósufjöll and Snæfellsjökull volcanoes. Contributions to Mineralogy and Petrology, 153 (5) 593-605 doi:10.1007/s00410-006-0165-5
Woolley, Alan R. (2019) Alkaline Rocks and Carbonatites of the World. Part 4: Antarctica, Asia and Europe (excluding the former USSR), Australasia and Oceanic Islands. The Geological Society of London. doi:10.1144/mpar4
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