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Mount Sidley, Executive Committee Range, Marie Byrd Land, Western Antarctica, Antarcticai
Regional Level Types
Mount SidleyMountain
Executive Committee RangeMountain Range
Marie Byrd LandArea
Western AntarcticaRegion
AntarcticaContinent

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Key
Latitude & Longitude (WGS84):
77° 2' South , 126° 6' West
Latitude & Longitude (decimal):
Locality type:
Köppen climate type:


Mount Sidley is the highest dormant volcano in Antarctica, a member of the Volcanic Seven Summits, with a summit elevation of 4,181–4,285 metres (13,717–14,058 ft). It is a massive, mainly snow-covered shield volcano which is the highest of the five volcanic mountains that comprise the Executive Committee Range of Marie Byrd Land. The feature is marked by a 5 km wide caldera on the southern side and stands NE of Mount Waesche in the southern part of the range.

The mountain was discovered by Rear Admiral Richard E. Byrd on an airplane flight, November 18, 1934, and named by him for Mabelle E. Sidley, the daughter of William Horlick who was a contributor to the 1933–35 Byrd Antarctic Expedition. Despite its height, the volcano's extremely remote location means that it is little known even in the mountaineering world compared to the much more accessible Mount Erebus, the second-highest Antarctic volcano which is located near the U.S. and New Zealand bases on Ross Island.

The first recorded ascent of Mount Sidley was by New Zealander Bill Atkinson on January 11, 1990, whilst working in support of a United States Antarctic Program scientific field party. [Wikipedia]

Lower crustal pyroxenite xenoliths in a phonolite.

The xenoliths have suffered localized breakdown reactions during their residence in a shallow magmatic chamber below the volcano.

Select Mineral List Type

Standard Detailed Gallery Strunz Dana Chemical Elements

Mineral List


12 valid minerals.

Rock Types Recorded

Note: data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

Aegirine
Formula: NaFe3+Si2O6
Reference: Woolley, A.R. (2019) Alkaline Rocks and Carbonatites of the World. Part 4: Antarctica, Asia and Europe: 8.
Aenigmatite
Formula: Na4[Fe2+10Ti2]O4[Si12O36]
Reference: Woolley, A.R. (2019) Alkaline Rocks and Carbonatites of the World. Part 4: Antarctica, Asia and Europe: 8.
'Albite-Anorthite Series'
Reference: Grapes, R.H., Wysoczanski, R.J., Hoskin, P.W.O. (2003) Rhönite paragenesis in pyroxenite xenoliths, Mount Sidley volcano, Marie Byrd Land, West Antarctica. Mineralogical Magazine: 67(4): 639-651. ; Woolley, A.R. (2019) Alkaline Rocks and Carbonatites of the World. Part 4: Antarctica, Asia and Europe: 8.
'Alkali Feldspar'
Reference: Woolley, A.R. (2019) Alkaline Rocks and Carbonatites of the World. Part 4: Antarctica, Asia and Europe: 8.
'Anorthoclase'
Formula: (Na,K)AlSi3O8
Reference: Woolley, A.R. (2019) Alkaline Rocks and Carbonatites of the World. Part 4: Antarctica, Asia and Europe: 8.
'Apatite'
Formula: Ca5(PO4)3(Cl/F/OH)
Reference: Woolley, A.R. (2019) Alkaline Rocks and Carbonatites of the World. Part 4: Antarctica, Asia and Europe: 8.
Arfvedsonite
Formula: [Na][Na2][Fe2+4Fe3+]Si8O22(OH)2
Reference: Woolley, A.R. (2019) Alkaline Rocks and Carbonatites of the World. Part 4: Antarctica, Asia and Europe: 8.
Augite
Formula: (CaxMgyFez)(Mgy1Fez1)Si2O6
Reference: Woolley, A.R. (2019) Alkaline Rocks and Carbonatites of the World. Part 4: Antarctica, Asia and Europe: 8.
Augite var. Titanian Augite
Formula: (Ca,Na)(Mg,Ti, Fe,Al,)(Si,Al)2O6
Reference: Woolley, A.R. (2019) Alkaline Rocks and Carbonatites of the World. Part 4: Antarctica, Asia and Europe: 8.
'Clinopyroxene Subgroup'
Reference: Grapes, R.H., Wysoczanski, R.J., Hoskin, P.W.O. (2003) Rhönite paragenesis in pyroxenite xenoliths, Mount Sidley volcano, Marie Byrd Land, West Antarctica. Mineralogical Magazine: 67(4): 639-651.; Woolley, A.R. (2019) Alkaline Rocks and Carbonatites of the World. Part 4: Antarctica, Asia and Europe: 8.
Diopside
Formula: CaMgSi2O6
Reference: Woolley, A.R. (2019) Alkaline Rocks and Carbonatites of the World. Part 4: Antarctica, Asia and Europe: 8.
Fayalite
Formula: Fe2+2SiO4
Reference: Woolley, A.R. (2019) Alkaline Rocks and Carbonatites of the World. Part 4: Antarctica, Asia and Europe: 8.
'Fayalite-Forsterite Series'
Reference: Woolley, A.R. (2019) Alkaline Rocks and Carbonatites of the World. Part 4: Antarctica, Asia and Europe: 8.
Forsterite
Formula: Mg2SiO4
Reference: Grapes, R.H., Wysoczanski, R.J., Hoskin, P.W.O. (2003) Rhönite paragenesis in pyroxenite xenoliths, Mount Sidley volcano, Marie Byrd Land, West Antarctica. Mineralogical Magazine: 67(4): 639-651.
'Glass'
Reference: Grapes, R.H., Wysoczanski, R.J., Hoskin, P.W.O. (2003) Rhönite paragenesis in pyroxenite xenoliths, Mount Sidley volcano, Marie Byrd Land, West Antarctica. Mineralogical Magazine: 67(4): 639-651.
Kaersutite
Formula: NaCa2(Mg3AlTi4+)(Si6Al2)O22O2
Reference: Grapes, R.H., Wysoczanski, R.J., Hoskin, P.W.O. (2003) Rhönite paragenesis in pyroxenite xenoliths, Mount Sidley volcano, Marie Byrd Land, West Antarctica. Mineralogical Magazine: 67(4): 639-651.
Magnetite
Formula: Fe2+Fe3+2O4
Reference: Grapes, R.H., Wysoczanski, R.J., Hoskin, P.W.O. (2003) Rhönite paragenesis in pyroxenite xenoliths, Mount Sidley volcano, Marie Byrd Land, West Antarctica. Mineralogical Magazine: 67(4): 639-651.
Magnetite var. Titaniferous Magnetite
Formula: Fe2+(Fe3+,Ti)2O4
Reference: Grapes, R.H., Wysoczanski, R.J., Hoskin, P.W.O. (2003) Rhönite paragenesis in pyroxenite xenoliths, Mount Sidley volcano, Marie Byrd Land, West Antarctica. Mineralogical Magazine: 67(4): 639-651.; Woolley, A.R. (2019) Alkaline Rocks and Carbonatites of the World. Part 4: Antarctica, Asia and Europe: 8.
Nepheline
Formula: Na3K(Al4Si4O16)
Reference: Woolley, A.R. (2019) Alkaline Rocks and Carbonatites of the World. Part 4: Antarctica, Asia and Europe: 8.
Phlogopite
Formula: KMg3(AlSi3O10)(OH)2
Reference: Woolley, A.R. (2019) Alkaline Rocks and Carbonatites of the World. Part 4: Antarctica, Asia and Europe: 8.
Rhönite
Formula: Ca4[Mg8Fe3+2Ti2]O4[Si6Al6O36]
Description: Destabilization of kaersutite.
Reference: Grapes, R.H., Wysoczanski, R.J., Hoskin, P.W.O. (2003) Rhönite paragenesis in pyroxenite xenoliths, Mount Sidley volcano, Marie Byrd Land, West Antarctica. Mineralogical Magazine: 67(4): 639-651.

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Magnetite4.BB.05Fe2+Fe3+2O4
var. Titaniferous Magnetite4.BB.05Fe2+(Fe3+,Ti)2O4
Group 9 - Silicates
Aegirine9.DA.25NaFe3+Si2O6
Aenigmatite9.DH.40Na4[Fe2+10Ti2]O4[Si12O36]
'Anorthoclase'9.FA.30(Na,K)AlSi3O8
Arfvedsonite9.DE.25[Na][Na2][Fe2+4Fe3+]Si8O22(OH)2
Augite9.DA.15(CaxMgyFez)(Mgy1Fez1)Si2O6
var. Titanian Augite9.DA.15(Ca,Na)(Mg,Ti, Fe,Al,)(Si,Al)2O6
Diopside9.DA.15CaMgSi2O6
Fayalite9.AC.05Fe2+2SiO4
Forsterite9.AC.05Mg2SiO4
Kaersutite9.DE.15NaCa2(Mg3AlTi4+)(Si6Al2)O22O2
Nepheline9.FA.05Na3K(Al4Si4O16)
Phlogopite9.EC.20KMg3(AlSi3O10)(OH)2
Rhönite9.DH.40Ca4[Mg8Fe3+2Ti2]O4[Si6Al6O36]
Unclassified Minerals, Rocks, etc.
'Albite-Anorthite Series'-
'Alkali Feldspar'-
'Apatite'-Ca5(PO4)3(Cl/F/OH)
'Clinopyroxene Subgroup'-
'Fayalite-Forsterite Series'-
'Glass'-

List of minerals arranged by Dana 8th Edition classification

Group 7 - MULTIPLE OXIDES
AB2X4
Magnetite7.2.2.3Fe2+Fe3+2O4
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with all cations in octahedral [6] coordination
Fayalite51.3.1.1Fe2+2SiO4
Forsterite51.3.1.2Mg2SiO4
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
Diopside65.1.3a.1CaMgSi2O6
Group 66 - INOSILICATES Double-Width,Unbranched Chains,(W=2)
Amphiboles - Mg-Fe-Mn-Li subgroup
Kaersutite66.1.3a.18NaCa2(Mg3AlTi4+)(Si6Al2)O22O2
Group 69 - INOSILICATES Chains with Side Branches or Loops
Chains with Side Branches or Loops with P>2
Aenigmatite69.2.1a.1Na4[Fe2+10Ti2]O4[Si12O36]
Rhönite69.2.1a.5Ca4[Mg8Fe3+2Ti2]O4[Si6Al6O36]
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Phlogopite71.2.2b.1KMg3(AlSi3O10)(OH)2
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
'Anorthoclase'76.1.1.6(Na,K)AlSi3O8
Al-Si Framework Feldspathoids and related species
Nepheline76.2.1.2Na3K(Al4Si4O16)
Unclassified Minerals, Mixtures, etc.
'Albite-Anorthite Series'-
'Alkali Feldspar'-
'Apatite'-Ca5(PO4)3(Cl/F/OH)
Arfvedsonite-[Na][Na2][Fe2+4Fe3+]Si8O22(OH)2
Augite
var. Titanian Augite
-(Ca,Na)(Mg,Ti, Fe,Al,)(Si,Al)2O6
'Clinopyroxene Subgroup'-
'Fayalite-Forsterite Series'-
'Glass'-
Magnetite
var. Titaniferous Magnetite
-Fe2+(Fe3+,Ti)2O4

List of minerals for each chemical element

HHydrogen
H PhlogopiteKMg3(AlSi3O10)(OH)2
H Arfvedsonite[Na][Na2][Fe42+Fe3+]Si8O22(OH)2
H ApatiteCa5(PO4)3(Cl/F/OH)
OOxygen
O RhöniteCa4[Mg8Fe23+Ti2]O4[Si6Al6O36]
O ForsteriteMg2SiO4
O Magnetite var. Titaniferous MagnetiteFe2+(Fe3+,Ti)2O4
O KaersutiteNaCa2(Mg3AlTi4+)(Si6Al2)O22O2
O MagnetiteFe2+Fe23+O4
O DiopsideCaMgSi2O6
O PhlogopiteKMg3(AlSi3O10)(OH)2
O Arfvedsonite[Na][Na2][Fe42+Fe3+]Si8O22(OH)2
O ApatiteCa5(PO4)3(Cl/F/OH)
O AegirineNaFe3+Si2O6
O Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
O Augite var. Titanian Augite(Ca,Na)(Mg,Ti, Fe,Al,)(Si,Al)2O6
O FayaliteFe22+SiO4
O AenigmatiteNa4[Fe102+Ti2]O4[Si12O36]
O NephelineNa3K(Al4Si4O16)
O Anorthoclase(Na,K)AlSi3O8
FFluorine
F ApatiteCa5(PO4)3(Cl/F/OH)
NaSodium
Na KaersutiteNaCa2(Mg3AlTi4+)(Si6Al2)O22O2
Na Arfvedsonite[Na][Na2][Fe42+Fe3+]Si8O22(OH)2
Na AegirineNaFe3+Si2O6
Na Augite var. Titanian Augite(Ca,Na)(Mg,Ti, Fe,Al,)(Si,Al)2O6
Na AenigmatiteNa4[Fe102+Ti2]O4[Si12O36]
Na NephelineNa3K(Al4Si4O16)
Na Anorthoclase(Na,K)AlSi3O8
MgMagnesium
Mg RhöniteCa4[Mg8Fe23+Ti2]O4[Si6Al6O36]
Mg ForsteriteMg2SiO4
Mg KaersutiteNaCa2(Mg3AlTi4+)(Si6Al2)O22O2
Mg DiopsideCaMgSi2O6
Mg PhlogopiteKMg3(AlSi3O10)(OH)2
Mg Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Mg Augite var. Titanian Augite(Ca,Na)(Mg,Ti, Fe,Al,)(Si,Al)2O6
AlAluminium
Al RhöniteCa4[Mg8Fe23+Ti2]O4[Si6Al6O36]
Al KaersutiteNaCa2(Mg3AlTi4+)(Si6Al2)O22O2
Al PhlogopiteKMg3(AlSi3O10)(OH)2
Al Augite var. Titanian Augite(Ca,Na)(Mg,Ti, Fe,Al,)(Si,Al)2O6
Al NephelineNa3K(Al4Si4O16)
Al Anorthoclase(Na,K)AlSi3O8
SiSilicon
Si RhöniteCa4[Mg8Fe23+Ti2]O4[Si6Al6O36]
Si ForsteriteMg2SiO4
Si KaersutiteNaCa2(Mg3AlTi4+)(Si6Al2)O22O2
Si DiopsideCaMgSi2O6
Si PhlogopiteKMg3(AlSi3O10)(OH)2
Si Arfvedsonite[Na][Na2][Fe42+Fe3+]Si8O22(OH)2
Si AegirineNaFe3+Si2O6
Si Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Si Augite var. Titanian Augite(Ca,Na)(Mg,Ti, Fe,Al,)(Si,Al)2O6
Si FayaliteFe22+SiO4
Si AenigmatiteNa4[Fe102+Ti2]O4[Si12O36]
Si NephelineNa3K(Al4Si4O16)
Si Anorthoclase(Na,K)AlSi3O8
PPhosphorus
P ApatiteCa5(PO4)3(Cl/F/OH)
ClChlorine
Cl ApatiteCa5(PO4)3(Cl/F/OH)
KPotassium
K PhlogopiteKMg3(AlSi3O10)(OH)2
K NephelineNa3K(Al4Si4O16)
K Anorthoclase(Na,K)AlSi3O8
CaCalcium
Ca RhöniteCa4[Mg8Fe23+Ti2]O4[Si6Al6O36]
Ca KaersutiteNaCa2(Mg3AlTi4+)(Si6Al2)O22O2
Ca DiopsideCaMgSi2O6
Ca ApatiteCa5(PO4)3(Cl/F/OH)
Ca Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Ca Augite var. Titanian Augite(Ca,Na)(Mg,Ti, Fe,Al,)(Si,Al)2O6
TiTitanium
Ti RhöniteCa4[Mg8Fe23+Ti2]O4[Si6Al6O36]
Ti Magnetite var. Titaniferous MagnetiteFe2+(Fe3+,Ti)2O4
Ti KaersutiteNaCa2(Mg3AlTi4+)(Si6Al2)O22O2
Ti Augite var. Titanian Augite(Ca,Na)(Mg,Ti, Fe,Al,)(Si,Al)2O6
Ti AenigmatiteNa4[Fe102+Ti2]O4[Si12O36]
FeIron
Fe RhöniteCa4[Mg8Fe23+Ti2]O4[Si6Al6O36]
Fe Magnetite var. Titaniferous MagnetiteFe2+(Fe3+,Ti)2O4
Fe MagnetiteFe2+Fe23+O4
Fe Arfvedsonite[Na][Na2][Fe42+Fe3+]Si8O22(OH)2
Fe AegirineNaFe3+Si2O6
Fe Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Fe Augite var. Titanian Augite(Ca,Na)(Mg,Ti, Fe,Al,)(Si,Al)2O6
Fe FayaliteFe22+SiO4
Fe AenigmatiteNa4[Fe102+Ti2]O4[Si12O36]

Geochronology

Mineralization age: Neogene : 5.68 ± 0.06 Ma to 4.18 ± 0.04 Ma

Important note: This table is based only on rock and mineral ages recorded on mindat.org for this locality and is not necessarily a complete representation of the geochronology, but does give an indication of possible mineralization events relevant to this locality. As more age information is added this table may expand in the future. A break in the table simply indicates a lack of data entered here, not necessarily a break in the geologic sequence. Grey background entries are from different, related, localities.

Geologic TimeRocks, Minerals and Events
Phanerozoic
 Cenozoic
  Neogene
   Pliocene
ⓘ Basanite (youngest age)4.18 ± 0.04 Ma
   Miocene
ⓘ Basanite (oldest age)5.68 ± 0.06 Ma

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Panter, K.S., Kyle, P.R., Smellie, J.L. (1997) Petrogenesis of a phonolite–trachyte succession at Mount Sidley, Marie Byrd Land, Antarctica. Journal of Petrology, 38, 1225–1253.
Grapes, R.H., Wysoczanski, R.J., Hoskin, P.W.O. (2003) Rhönite paragenesis in pyroxenite xenoliths, Mount Sidley volcano, Marie Byrd Land, West Antarctica. Mineralogical Magazine, 67(4), 639-651.
Geologic Map of Antarctica, 1:5,000,000 scale.

Other Databases

Wikipedia:https://en.wikipedia.org/wiki/Mount_Sidley
Wikidata ID:Q924312

Other Regions, Features and Areas containing this locality

Antarctic MeteoritesGroup of Meteorite Fall Locations
Antarctic PlateTectonic Plate

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.
 
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