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Tvora complex, Queen Maud Land, Eastern Antarctica, Antarcticai
Regional Level Types
Tvora complexComplex
Queen Maud Land- not defined -
Eastern AntarcticaRegion
AntarcticaContinent

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Key
Latitude & Longitude (WGS84):
72° 10' South , 0° 5' West
Latitude & Longitude (decimal):
Locality type:
Köppen climate type:


Tvora (72°10′S 0°5′W) is a mountain with two north-trending spurs, about 3 nautical miles (6 km) east of Straumsvola Mountain in the Sverdrup Mountains, Queen Maud Land. Plotted from air photos by the German Antarctic Expedition (1938–39). Remapped by Norwegian cartographers from surveys and air photos by Norwegian-British-Swedish Antarctic Expedition (NBSAE) (1949–52) and air photos by the Norwegian expedition (1958–59) and named Tvora (two ridges). [Wikipedia]

The Tvora complex crops out at the nunatak Tvora (the adjacent nunatak Straumsvola is located 5 km to the northwest, see http://www.mindat.org/loc-155834.html) and consists of a quartz syenite pluton approximately 3 km in diameter, which intrudes gneisses of the Jutulrøra Formation (Svedrupfjella Group).

Numerous Jurassic dykes of various composition (dolerites, phonolites, etc.) intruded both the gneissic country rocks and the syenite pluton. Jurassic dykes of western Dronning Maud Land dyke swarms are probably related to magmatism associated with the Karoo large igneous province in Africa.

Regions containing this locality

Antarctic PlateTectonic Plate
Antarctic MeteoritesGroup of Meteorite Fall Locations

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


8 valid minerals.

Detailed Mineral List:

Aegirine
Formula: NaFe3+Si2O6
Reference: Riley, T.R., Curtis, M.L., Leat, P.T., Millar, I.L. (2009): The geochemistry of Middle Jurassic dykes associated with the Straumsvola-Tvora alkaline plutons, Dronning Maud Land, Antarctica and their association with the Karoo large igneous province. Mineralogical Magazine, 73, 2, 205-226.
'Albite-Anorthite Series'
Reference: Hjelle A. (1972): Some observations on the geology of H. U. Sverdrupfjella, Dronning Maud Land. Norsk Polarinstitutt, Årbok 1972, 7-22; Riley, T.R., Curtis, M.L., Leat, P.T., Millar, I.L. (2009): The geochemistry of Middle Jurassic dykes associated with the Straumsvola-Tvora alkaline plutons, Dronning Maud Land, Antarctica and their association with the Karoo large igneous province. Mineralogical Magazine, 73, 2, 205-226.
'Amphibole Supergroup'
Formula: AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Reference: Hjelle A. (1972): Some observations on the geology of H. U. Sverdrupfjella, Dronning Maud Land. Norsk Polarinstitutt, Årbok 1972, 7-22.
Augite
Formula: (CaxMgyFez)(Mgy1Fez1)Si2O6
Reference: Riley, T.R., Curtis, M.L., Leat, P.T., Millar, I.L. (2009): The geochemistry of Middle Jurassic dykes associated with the Straumsvola-Tvora alkaline plutons, Dronning Maud Land, Antarctica and their association with the Karoo large igneous province. Mineralogical Magazine, 73, 2, 205-226.
'Clinopyroxene Subgroup'
Reference: Hjelle A. (1972): Some observations on the geology of H. U. Sverdrupfjella, Dronning Maud Land. Norsk Polarinstitutt, Årbok 1972, 7-22.
'Fayalite-Forsterite Series'
Reference: Hjelle A. (1972): Some observations on the geology of H. U. Sverdrupfjella, Dronning Maud Land. Norsk Polarinstitutt, Årbok 1972, 7-22; Riley, T.R., Curtis, M.L., Leat, P.T., Millar, I.L. (2009): The geochemistry of Middle Jurassic dykes associated with the Straumsvola-Tvora alkaline plutons, Dronning Maud Land, Antarctica and their association with the Karoo large igneous province. Mineralogical Magazine, 73, 2, 205-226.
'Iddingsite'
Formula: MgO · Fe2O3 · 3SiO2·4H2O
Reference: Riley, T.R., Curtis, M.L., Leat, P.T., Millar, I.L. (2009): The geochemistry of Middle Jurassic dykes associated with the Straumsvola-Tvora alkaline plutons, Dronning Maud Land, Antarctica and their association with the Karoo large igneous province. Mineralogical Magazine, 73, 2, 205-226.
Ilmenite
Formula: Fe2+TiO3
Reference: Riley, T.R., Curtis, M.L., Leat, P.T., Millar, I.L. (2009): The geochemistry of Middle Jurassic dykes associated with the Straumsvola-Tvora alkaline plutons, Dronning Maud Land, Antarctica and their association with the Karoo large igneous province. Mineralogical Magazine, 73, 2, 205-226.
Kalsilite
Formula: KAlSiO4
Reference: Riley, T.R., Curtis, M.L., Leat, P.T., Millar, I.L. (2009): The geochemistry of Middle Jurassic dykes associated with the Straumsvola-Tvora alkaline plutons, Dronning Maud Land, Antarctica and their association with the Karoo large igneous province. Mineralogical Magazine, 73, 2, 205-226.
'K Feldspar'
Reference: Hjelle A. (1972): Some observations on the geology of H. U. Sverdrupfjella, Dronning Maud Land. Norsk Polarinstitutt, Årbok 1972, 7-22.
Magnetite
Formula: Fe2+Fe3+2O4
Reference: Hjelle A. (1972): Some observations on the geology of H. U. Sverdrupfjella, Dronning Maud Land. Norsk Polarinstitutt, Årbok 1972, 7-22; Riley, T.R., Curtis, M.L., Leat, P.T., Millar, I.L. (2009): The geochemistry of Middle Jurassic dykes associated with the Straumsvola-Tvora alkaline plutons, Dronning Maud Land, Antarctica and their association with the Karoo large igneous province. Mineralogical Magazine, 73, 2, 205-226.
Nepheline
Formula: Na3K(Al4Si4O16)
Reference: Riley, T.R., Curtis, M.L., Leat, P.T., Millar, I.L. (2009): The geochemistry of Middle Jurassic dykes associated with the Straumsvola-Tvora alkaline plutons, Dronning Maud Land, Antarctica and their association with the Karoo large igneous province. Mineralogical Magazine, 73, 2, 205-226.
Quartz
Formula: SiO2
Reference: Allen, A.R., Grantham, G.H., Groenewald, P.B., Hunter, D.R. (1986): Tectonic and metamorphic evolution of H.U. Sverdrupfjella, western Dronning Maud Land, Antarctica - a preliminary review. Geocongress 1986 (Johannesburg), extended abstr., 707-710; Harris, C., Grantham, G.H. (1993): Geology and petrogenesis of the Straumsvola nepheline syenite complex, Dronning Maud Land, Antarctica. Geological Magazine, 130, 4, 513-532.
Sanidine
Formula: K(AlSi3O8)
Reference: Riley, T.R., Curtis, M.L., Leat, P.T., Millar, I.L. (2009): The geochemistry of Middle Jurassic dykes associated with the Straumsvola-Tvora alkaline plutons, Dronning Maud Land, Antarctica and their association with the Karoo large igneous province. Mineralogical Magazine, 73, 2, 205-226.
'Serpentine Subgroup'
Formula: D3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Reference: Riley, T.R., Curtis, M.L., Leat, P.T., Millar, I.L. (2009): The geochemistry of Middle Jurassic dykes associated with the Straumsvola-Tvora alkaline plutons, Dronning Maud Land, Antarctica and their association with the Karoo large igneous province. Mineralogical Magazine, 73, 2, 205-226.

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Ilmenite4.CB.05Fe2+TiO3
Magnetite4.BB.05Fe2+Fe3+2O4
Quartz4.DA.05SiO2
Group 9 - Silicates
Aegirine9.DA.25NaFe3+Si2O6
Augite9.DA.15(CaxMgyFez)(Mgy1Fez1)Si2O6
Kalsilite9.FA.05KAlSiO4
Nepheline9.FA.05Na3K(Al4Si4O16)
Sanidine9.FA.30K(AlSi3O8)
Unclassified Minerals, Rocks, etc.
'Albite-Anorthite Series'-
'Amphibole Supergroup'-AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
'Clinopyroxene Subgroup'-
'Fayalite-Forsterite Series'-
'Iddingsite'-MgO · Fe2O3 · 3SiO2·4H2O
'K Feldspar'-
'Serpentine Subgroup'-D3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn

List of minerals arranged by Dana 8th Edition classification

Group 4 - SIMPLE OXIDES
A2X3
Ilmenite4.3.5.1Fe2+TiO3
Group 7 - MULTIPLE OXIDES
AB2X4
Magnetite7.2.2.3Fe2+Fe3+2O4
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=2
Aegirine65.1.3c.2NaFe3+Si2O6
Augite65.1.3a.3(CaxMgyFez)(Mgy1Fez1)Si2O6
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Sanidine76.1.1.2K(AlSi3O8)
Al-Si Framework Feldspathoids and related species
Kalsilite76.2.1.1KAlSiO4
Nepheline76.2.1.2Na3K(Al4Si4O16)
Unclassified Minerals, Mixtures, etc.
'Albite-Anorthite Series'-
'Amphibole Supergroup'-AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
'Clinopyroxene Subgroup'-
'Fayalite-Forsterite Series'-
'Iddingsite'-MgO · Fe2O3 · 3SiO2·4H2O
'K Feldspar'-
'Serpentine Subgroup'-D3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn

List of minerals for each chemical element

HHydrogen
H IddingsiteMgO · Fe2O3 · 3SiO2·4H2O
H Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
H Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
OOxygen
O Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
O IlmeniteFe2+TiO3
O MagnetiteFe2+Fe23+O4
O IddingsiteMgO · Fe2O3 · 3SiO2·4H2O
O Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
O AegirineNaFe3+Si2O6
O NephelineNa3K(Al4Si4O16)
O KalsiliteKAlSiO4
O SanidineK(AlSi3O8)
O Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
O QuartzSiO2
FFluorine
F Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
NaSodium
Na AegirineNaFe3+Si2O6
Na NephelineNa3K(Al4Si4O16)
MgMagnesium
Mg Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Mg IddingsiteMgO · Fe2O3 · 3SiO2·4H2O
Mg Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
AlAluminium
Al Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Al NephelineNa3K(Al4Si4O16)
Al KalsiliteKAlSiO4
Al SanidineK(AlSi3O8)
Al Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
SiSilicon
Si Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Si IddingsiteMgO · Fe2O3 · 3SiO2·4H2O
Si Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Si AegirineNaFe3+Si2O6
Si NephelineNa3K(Al4Si4O16)
Si KalsiliteKAlSiO4
Si SanidineK(AlSi3O8)
Si Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Si QuartzSiO2
ClChlorine
Cl Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
KPotassium
K NephelineNa3K(Al4Si4O16)
K KalsiliteKAlSiO4
K SanidineK(AlSi3O8)
CaCalcium
Ca Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
TiTitanium
Ti IlmeniteFe2+TiO3
Ti Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
MnManganese
Mn Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
FeIron
Fe Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Fe IlmeniteFe2+TiO3
Fe MagnetiteFe2+Fe23+O4
Fe IddingsiteMgO · Fe2O3 · 3SiO2·4H2O
Fe Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Fe AegirineNaFe3+Si2O6
NiNickel
Ni Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
ZnZinc
Zn Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Ravich, M.G., Solov'yev, D.S. [Равич М.Г., Соловьев Д.С.] (1966) Geology and petrology of the central part of the mountains of Dronning Maud Land (Eastern Antarctica) [Геология и петрология центральной части гор Земли Королевы Мод (Восточная Антарктида)]. Nedra, Leningrad, 290 pages (in Russian).
Ravich, M.G., Solov'yev, D.S. (1969) Geology and petrology of the mountains of central Dronning Maud Land (Eastern Antarctica). Israel Program for Scientific Translations, Jerusalem, 348 pages (Translated from the 1966 Russian publication).
Hjelle A. (1972) Some observations on the geology of H. U. Sverdrupfjella, Dronning Maud Land. Norsk Polarinstitutt, Årbok 1972, 7-22.
Allen, A.R., Grantham, G.H., Groenewald, P.B., Hunter, D.R. (1986) Tectonic and metamorphic evolution of H.U. Sverdrupfjella, western Dronning Maud Land, Antarctica - a preliminary review. Geocongress 1986 (Johannesburg), extended abstr., 707-710.
Harris, C., Grantham, G.H. (1993) Geology and petrogenesis of the Straumsvola nepheline syenite complex, Dronning Maud Land, Antarctica. Geological Magazine, 130(4), 513-532.
Curtis, M.L., Riley, T.R., Owens, W.H., Leat, P.T., Duncan, R.A. (2008) The form, distribution and anisotropy of magnetic susceptibility of Jurassic dykes in H.U. Sverdrupfjella, Dronning Maud Land, Antarctica. Implications for dyke swarm emplacement. Journal of Structural Geology, 30, 1429-1447.
Riley, T.R., Curtis, M.L., Leat, P.T., Millar, I.L. (2009) The geochemistry of Middle Jurassic dykes associated with the Straumsvola-Tvora alkaline plutons, Dronning Maud Land, Antarctica and their association with the Karoo large igneous province. Mineralogical Magazine, 73(2), 205-226.

Other Databases

Wikipedia:https://en.wikipedia.org/wiki/Tvora
Wikidata ID:Q7709946


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