Inaccessible Island, Tristan da Cunha Archipelago, Saint Helena, Ascension and Tristan da Cunhai
| Regional Level Types | |
|---|---|
| Inaccessible Island | Island |
| Tristan da Cunha Archipelago | Archipelago |
| Saint Helena， Ascension and Tristan da Cunha | Overseas Territory |
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Type:
Age:
1.81 ± 0.36 to 0.72 Ma
Geologic Time:
Dating method:
K-Ar
Reference for age:
Chevallier, L., Rex, D. C., & Verwoerd, W. J. (1992). Geology and geochronology of Inaccessible Island, South Atlantic. Geological Magazine, 129(1), 1-16. doi.org/10.1017/S0016756800008098
Mindat Locality ID:
405416
Long-form identifier:
1:2:405416:3
GUID (UUID V4):
9eef97a1-2d1e-4afc-a7ee-b5defa5028c5
Other Languages:
French:
île Inaccessible, Tristan da Cunha, Sainte-Hélène
German:
Inaccessible, Tristan da Cunha, St. Helena
Italian:
Isola Inaccessibile, Tristan da Cunha, Sant'Elena
Russian:
Инаксессибл, Тристан-да-Кунья, Остров Святой Елены
Simplified Chinese:
伊纳克塞瑟布尔岛, 特里斯坦-达库尼亚, 圣赫勒拿
Spanish:
Isla Inaccesible, Tristán de Acuña, Isla Santa Elena
Afrikaans:
Inaccessible-eiland, Tristan da Cunha, Sint Helena
Azeri:
İnaksessibl, Tristan da Kuna, Müqəddəs Yelena adası
Basque:
Uharte Helezina, Tristan da Cunha, Santa Helena
Belarusian:
Інасесібл, Трыстан-да-Кунья , Востраў Святой Алены
Breton:
Inaccessible Island, Tristan da Cunha, Saint Helena
Catalan:
Illa Inaccessible, Tristan da Cunha, Santa Helena
Cebuano:
Inaccessible Island, Tristan da Cunha
Czech:
Nepřístupný ostrov, Tristan da Cunha, Svatá Helena
Danish:
Inaccessible Island, Tristan da Cunha, Sankt Helena
Dutch:
Inaccessible, Tristan da Cunha, Sint-Helena
Esperanto:
Inaccessible, Tristan da Cunha, Sankta Heleno
Farsi/Persian:
جزیره دستنیافتنی, تریستان, سنت هلن
Finnish:
Inaccessible, Tristan da Cunha, Saint Helena
Galician:
Illa Inaccesible, Tristan da Cunha, Santa Helena
Georgian:
ინაკსესიბლე, ტრისტანი-და-კუნია, წმინდა ელენეს კუნძული
Greek:
Απρόσιτη Νήσος, Τριστάν ντα Κούνια, Νήσος Αγίας Ελένης
Hebrew:
אינאקססיבל, טריסטן דה קונה, סנט הלנה
Indonesian:
Pulau Inaccessible, Tristan da Cunha, Saint Helena
Japanese:
イナクセシブル島, トリスタンダクーニャ, セントヘレナ
Lithuanian:
Nepasiekiamoji sala, Tristanas da Kunja, Šv. Elenos sala
Norwegian:
Inaccessible Island, Tristan da Cunha, St. Helena
Polish:
Inaccessible, Tristan da Cunha, Wyspa Świętej Heleny
Portuguese:
Ilha Inacessível, Tristão da Cunha , Santa Helena
Swedish:
Inaccessible Island, Tristan da Cunha, Sankta Helena
Traditional Chinese:
伊納克瑟布爾島, 崔斯坦達庫尼亞, 聖海倫娜
Ukrainian:
Неприступний, Трістан-да-Кунья, Острів Святої Єлени
Upper Sorbian:
Inaccessible
Vietnamese:
Đảo Inaccessible, Tristan da Cunha, Saint Helena
Wu Chinese:
伊納克塞瑟布爾島, 特里斯坦-達庫尼亞, 圣赫勒拿岛
Extends over 4 x 5 km and has a highest point of 548 m.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsMineral List
4 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 DiagramDetailed Mineral List:
| ⓘ Aegirine-augite Formula: (NaaCabFe2+cMgd)(Fe3+eAlfFe2+gMgh)Si2O6 Reference: Baker, P. E., Gass, I. G., Harris, P. G., & Maitre, R. L. M. (1964). The volcanological report of the Royal Society Expedition to Tristan da Cunha, 1962. Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 256(1075), 439-575. doi.org/10.1098/rsta.1964.0011
Chevallier, L., Rex, D. C., & Verwoerd, W. J. (1992). Geology and geochronology of Inaccessible Island, South Atlantic. Geological Magazine, 129(1), 1-16. doi.org/10.1017/S0016756800008098
Cliff, R. A., Baker, P. E., & Mateer, N. J. (1991). Geochemistry of inaccessible island volcanics. Chemical Geology, 92(4), 251-260. doi.org/10.1016/0009-2541(91)90073-Z |
| ⓘ Albite Formula: Na(AlSi3O8) Reference: Baker, P. E., Gass, I. G., Harris, P. G., & Maitre, R. L. M. (1964). The volcanological report of the Royal Society Expedition to Tristan da Cunha, 1962. Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 256(1075), 439-575. doi.org/10.1098/rsta.1964.0011
Chevallier, L., Rex, D. C., & Verwoerd, W. J. (1992). Geology and geochronology of Inaccessible Island, South Atlantic. Geological Magazine, 129(1), 1-16. doi.org/10.1017/S0016756800008098
Cliff, R. A., Baker, P. E., & Mateer, N. J. (1991). Geochemistry of inaccessible island volcanics. Chemical Geology, 92(4), 251-260. doi.org/10.1016/0009-2541(91)90073-Z
Baker, P. E., Gass, I. G., Harris, P. G., & Maitre, R. L. M. (1964). The volcanological report of the Royal Society Expedition to Tristan da Cunha, 1962. Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 256(1075), 439-575. doi.org/10.1098/rsta.1964.0011
Chevallier, L., Rex, D. C., & Verwoerd, W. J. (1992). Geology and geochronology of Inaccessible Island, South Atlantic. Geological Magazine, 129(1), 1-16. doi.org/10.1017/S0016756800008098
Cliff, R. A., Baker, P. E., & Mateer, N. J. (1991). Geochemistry of inaccessible island volcanics. Chemical Geology, 92(4), 251-260. doi.org/10.1016/0009-2541(91)90073-Z |
| ⓘ Albite var. Anorthoclase Formula: (Na,K)AlSi3O8 Reference: Baker, P. E., Gass, I. G., Harris, P. G., & Maitre, R. L. M. (1964). The volcanological report of the Royal Society Expedition to Tristan da Cunha, 1962. Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 256(1075), 439-575. doi.org/10.1098/rsta.1964.0011
Chevallier, L., Rex, D. C., & Verwoerd, W. J. (1992). Geology and geochronology of Inaccessible Island, South Atlantic. Geological Magazine, 129(1), 1-16. doi.org/10.1017/S0016756800008098
Cliff, R. A., Baker, P. E., & Mateer, N. J. (1991). Geochemistry of inaccessible island volcanics. Chemical Geology, 92(4), 251-260. doi.org/10.1016/0009-2541(91)90073-Z
Baker, P. E., Gass, I. G., Harris, P. G., & Maitre, R. L. M. (1964). The volcanological report of the Royal Society Expedition to Tristan da Cunha, 1962. Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 256(1075), 439-575. doi.org/10.1098/rsta.1964.0011
Chevallier, L., Rex, D. C., & Verwoerd, W. J. (1992). Geology and geochronology of Inaccessible Island, South Atlantic. Geological Magazine, 129(1), 1-16. doi.org/10.1017/S0016756800008098
Cliff, R. A., Baker, P. E., & Mateer, N. J. (1991). Geochemistry of inaccessible island volcanics. Chemical Geology, 92(4), 251-260. doi.org/10.1016/0009-2541(91)90073-Z |
| ⓘ 'Biotite' Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2 Reference: Baker, P. E., Gass, I. G., Harris, P. G., & Maitre, R. L. M. (1964). The volcanological report of the Royal Society Expedition to Tristan da Cunha, 1962. Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 256(1075), 439-575. doi.org/10.1098/rsta.1964.0011
Chevallier, L., Rex, D. C., & Verwoerd, W. J. (1992). Geology and geochronology of Inaccessible Island, South Atlantic. Geological Magazine, 129(1), 1-16. doi.org/10.1017/S0016756800008098
Cliff, R. A., Baker, P. E., & Mateer, N. J. (1991). Geochemistry of inaccessible island volcanics. Chemical Geology, 92(4), 251-260. doi.org/10.1016/0009-2541(91)90073-Z |
| ⓘ Fayalite Formula: Fe2+2SiO4 Reference: Baker, P. E., Gass, I. G., Harris, P. G., & Maitre, R. L. M. (1964). The volcanological report of the Royal Society Expedition to Tristan da Cunha, 1962. Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 256(1075), 439-575. doi.org/10.1098/rsta.1964.0011
Chevallier, L., Rex, D. C., & Verwoerd, W. J. (1992). Geology and geochronology of Inaccessible Island, South Atlantic. Geological Magazine, 129(1), 1-16. doi.org/10.1017/S0016756800008098
Cliff, R. A., Baker, P. E., & Mateer, N. J. (1991). Geochemistry of inaccessible island volcanics. Chemical Geology, 92(4), 251-260. doi.org/10.1016/0009-2541(91)90073-Z |
| ⓘ 'Fayalite-Forsterite Series' Reference: Baker, P. E., Gass, I. G., Harris, P. G., & Maitre, R. L. M. (1964). The volcanological report of the Royal Society Expedition to Tristan da Cunha, 1962. Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 256(1075), 439-575. doi.org/10.1098/rsta.1964.0011
Chevallier, L., Rex, D. C., & Verwoerd, W. J. (1992). Geology and geochronology of Inaccessible Island, South Atlantic. Geological Magazine, 129(1), 1-16. doi.org/10.1017/S0016756800008098
Cliff, R. A., Baker, P. E., & Mateer, N. J. (1991). Geochemistry of inaccessible island volcanics. Chemical Geology, 92(4), 251-260. doi.org/10.1016/0009-2541(91)90073-Z |
| ⓘ 'Feldspar Group' Reference: Baker, P. E., Gass, I. G., Harris, P. G., & Maitre, R. L. M. (1964). The volcanological report of the Royal Society Expedition to Tristan da Cunha, 1962. Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 256(1075), 439-575. doi.org/10.1098/rsta.1964.0011
Chevallier, L., Rex, D. C., & Verwoerd, W. J. (1992). Geology and geochronology of Inaccessible Island, South Atlantic. Geological Magazine, 129(1), 1-16. doi.org/10.1017/S0016756800008098
Cliff, R. A., Baker, P. E., & Mateer, N. J. (1991). Geochemistry of inaccessible island volcanics. Chemical Geology, 92(4), 251-260. doi.org/10.1016/0009-2541(91)90073-Z |
| ⓘ 'Plagioclase' Formula: (Na,Ca)[(Si,Al)AlSi2]O8 Reference: Baker, P. E., Gass, I. G., Harris, P. G., & Maitre, R. L. M. (1964). The volcanological report of the Royal Society Expedition to Tristan da Cunha, 1962. Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 256(1075), 439-575. doi.org/10.1098/rsta.1964.0011
Chevallier, L., Rex, D. C., & Verwoerd, W. J. (1992). Geology and geochronology of Inaccessible Island, South Atlantic. Geological Magazine, 129(1), 1-16. doi.org/10.1017/S0016756800008098
Cliff, R. A., Baker, P. E., & Mateer, N. J. (1991). Geochemistry of inaccessible island volcanics. Chemical Geology, 92(4), 251-260. doi.org/10.1016/0009-2541(91)90073-Z |
| ⓘ 'Pyroxene Group' Formula: ADSi2O6 Reference: Baker, P. E., Gass, I. G., Harris, P. G., & Maitre, R. L. M. (1964). The volcanological report of the Royal Society Expedition to Tristan da Cunha, 1962. Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 256(1075), 439-575. doi.org/10.1098/rsta.1964.0011
Chevallier, L., Rex, D. C., & Verwoerd, W. J. (1992). Geology and geochronology of Inaccessible Island, South Atlantic. Geological Magazine, 129(1), 1-16. doi.org/10.1017/S0016756800008098
Cliff, R. A., Baker, P. E., & Mateer, N. J. (1991). Geochemistry of inaccessible island volcanics. Chemical Geology, 92(4), 251-260. doi.org/10.1016/0009-2541(91)90073-Z |
| ⓘ Zircon Formula: Zr(SiO4) Reference: Baker, P. E., Gass, I. G., Harris, P. G., & Maitre, R. L. M. (1964). The volcanological report of the Royal Society Expedition to Tristan da Cunha, 1962. Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 256(1075), 439-575. doi.org/10.1098/rsta.1964.0011
Chevallier, L., Rex, D. C., & Verwoerd, W. J. (1992). Geology and geochronology of Inaccessible Island, South Atlantic. Geological Magazine, 129(1), 1-16. doi.org/10.1017/S0016756800008098
Cliff, R. A., Baker, P. E., & Mateer, N. J. (1991). Geochemistry of inaccessible island volcanics. Chemical Geology, 92(4), 251-260. doi.org/10.1016/0009-2541(91)90073-Z |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 9 - Silicates | |||
|---|---|---|---|
| ⓘ | Aegirine-augite | 9.DA.20 | (NaaCabFe2+cMgd)(Fe3+eAlfFe2+gMgh)Si2O6 |
| ⓘ | Albite | 9.FA.35 | Na(AlSi3O8) |
| ⓘ | var. Anorthoclase | 9.FA.35 | (Na,K)AlSi3O8 |
| ⓘ | Fayalite | 9.AC.05 | Fe2+2SiO4 |
| ⓘ | Zircon | 9.AD.30 | Zr(SiO4) |
| Unclassified Minerals, Rocks, etc. | |||
| ⓘ | 'Biotite' | - | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2 |
| ⓘ | 'Fayalite-Forsterite Series' | - | |
| ⓘ | 'Feldspar Group' | - | |
| ⓘ | 'Plagioclase' | - | (Na,Ca)[(Si,Al)AlSi2]O8 |
| ⓘ | 'Pyroxene Group' | - | ADSi2O6 |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2 |
| O | Oxygen | |
| O | ⓘ Albite var. Anorthoclase | (Na,K)AlSi3O8 |
| O | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
| O | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2 |
| O | ⓘ Fayalite | Fe22+SiO4 |
| O | ⓘ Zircon | Zr(SiO4) |
| O | ⓘ Aegirine-augite | (NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6 |
| O | ⓘ Pyroxene Group | ADSi2O6 |
| O | ⓘ Albite | Na(AlSi3O8) |
| F | Fluorine | |
| F | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2 |
| Na | Sodium | |
| Na | ⓘ Albite var. Anorthoclase | (Na,K)AlSi3O8 |
| Na | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
| Na | ⓘ Aegirine-augite | (NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6 |
| Na | ⓘ Albite | Na(AlSi3O8) |
| Mg | Magnesium | |
| Mg | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2 |
| Mg | ⓘ Aegirine-augite | (NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6 |
| Al | Aluminium | |
| Al | ⓘ Albite var. Anorthoclase | (Na,K)AlSi3O8 |
| Al | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
| Al | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2 |
| Al | ⓘ Aegirine-augite | (NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6 |
| Al | ⓘ Albite | Na(AlSi3O8) |
| Si | Silicon | |
| Si | ⓘ Albite var. Anorthoclase | (Na,K)AlSi3O8 |
| Si | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
| Si | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2 |
| Si | ⓘ Fayalite | Fe22+SiO4 |
| Si | ⓘ Zircon | Zr(SiO4) |
| Si | ⓘ Aegirine-augite | (NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6 |
| Si | ⓘ Pyroxene Group | ADSi2O6 |
| Si | ⓘ Albite | Na(AlSi3O8) |
| K | Potassium | |
| K | ⓘ Albite var. Anorthoclase | (Na,K)AlSi3O8 |
| K | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2 |
| Ca | Calcium | |
| Ca | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
| Ca | ⓘ Aegirine-augite | (NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6 |
| Ti | Titanium | |
| Ti | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2 |
| Fe | Iron | |
| Fe | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2 |
| Fe | ⓘ Fayalite | Fe22+SiO4 |
| Fe | ⓘ Aegirine-augite | (NaaCabFec2+Mgd)(Fee3+AlfFeg2+Mgh)Si2O6 |
| Zr | Zirconium | |
| Zr | ⓘ Zircon | Zr(SiO4) |
Geochronology
Mineralization age: Miocene : 12.8 ± 1.3 Ma to 6.53 ± 0.26 MaImportant 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 Time | Rocks, Minerals and Events | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Phanerozoic | ||||||||||
| Cenozoic | ||||||||||
| Neogene | ||||||||||
| Miocene |
| |||||||||
Fossils
This region is too big to display the fossil list, try looking at smaller subregions.References
Sort by
Year (asc) Year (desc) Author (A-Z) Author (Z-A)Woolley, A. R. (2019). Alkaline Rocks and Carbonatites of the World, Part 4: Antarctica, Asia and Europe (excluding the former USSR), Australasia and Oceanic Islands. Geological Society of London, p. 497.
Baker, P. E., Gass, I. G., Harris, P. G., & Maitre, R. L. M. (1964). The volcanological report of the Royal Society Expedition to Tristan da Cunha, 1962. Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 256(1075), 439-575. doi.org/10.1098/rsta.1964.0011
Chevallier, L., Rex, D. C., & Verwoerd, W. J. (1992). Geology and geochronology of Inaccessible Island, South Atlantic. Geological Magazine, 129(1), 1-16. doi.org/10.1017/S0016756800008098
Cliff, R. A., Baker, P. E., & Mateer, N. J. (1991). Geochemistry of inaccessible island volcanics. Chemical Geology, 92(4), 251-260. doi.org/10.1016/0009-2541(91)90073-Z
Other Databases
| Wikipedia: | https://en.wikipedia.org/wiki/Inaccessible_Island |
|---|---|
| Wikidata ID: | Q914225 |
| GeoNames ID: | 3370905 |
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