Bristol Island

Island in the South Sandwich Islands

Bristol Island

NASA Terra ASTER image of Bristol Island

Location of Bristol Island

Geography
Coordinates| 59°01′S 26°32′W﻿ / ﻿59.017°S 26.533°W﻿ / -59.017; -26.533
Archipelago| South Sandwich Islands (Central Islands)
Length| 10.5 km (6.52 mi)
Width| 10.9 km (6.77 mi)
Highest elevation| 1,100 m (3600 ft)
Highest point| Mount Darnley
Administration

United Kingdom

Overseas territory| South Georgia and the South Sandwich Islands
Demographics
Population| Uninhabited

Bristol Island is an uninhabited island in the South Sandwich Islands, an archipelago in the Southern Ocean. The island is almost entirely surrounded by ice cliffs and largely covered with ice. It features both the oldest rocks of this archipelago and an active volcano that last erupted in 2016.

## Geography and geomorphology

[edit]

Bristol Island is one of the South Sandwich Islands, which lie southeast of South Georgia[1] in the Southern Ocean[2] and extend over a distance of 350 kilometres (220 mi) in a north–south direction.[3] It lies about 60 kilometres (37 mi) southwest of Montagu Island[4] and is separated from Southern Thule by Forsters Passage.[5] The first island of the South Sandwich Islands to be discovered was Freezland Rock, which was sighted on 31 January 1775 by a sailor named Freezland on James Cook's HMS Resolution. Cook considered Bristol Island to be a promontory on a larger island;[6] it was Thaddeus von Bellingshausen who in 1819 determined that Bristol was actually an island.[7] The island is almost inaccessible and thus among the most poorly studied of the South Sandwich Islands.[8]

Bristol Island has dimensions of 10.5 by 10.9 kilometres (6.5 by 6.8 mi),[9] making it one of the largest in the South Sandwich Islands.[10] It is roughly the shape of a square and almost entirely covered in ice. The points of the square are formed by[11] the island's northernmost Fryer Point (Spanish: Punta Teniente Santi),[12] easternmost Trulla Bluff (Spanish: Punta Peñón), southernmost Harker Point,[13] and the westernmost Turmoil Point.[11] Turmoil Point is a distinctive landmark when viewed from the west of the island, rising to an elevation of 400 m and culminating in a snow-covered summit while Trulla Bluff is a bluff that is also ice-covered and high in elevation.

In some places the coast is formed by sandy or bouldery beaches, but most of Bristol Island is surrounded by ice cliffs. They reach heights of 70 to 100 metres (230 to 330 ft)[14] and emanate from an interior that features several ridges and peaks.[8] Bristol Island has three mountains in its interior, the western Mount Sourabaya close to the centre of the island, the southern Mount Darnley and the eastern Havfruen Peak,[15] which together form a horseshoe.[16] Of these Mount Darnley is the highest point of Bristol Island, reaching an elevation of 1,100 metres (3,600 ft) above sea level.[9] Mount Sourabaya reaches 915 metres (3,002 ft); Havfruen Peak is 365 metres (1,198 ft)[17] or 490 metres (1,610 ft) high[14] and may be a lava dome or a parasitic vent.[10] Pyroclastic cones and three overlapping vents form Mount Sourabaya, the active centre of Bristol Island.[18]

### Surrounding features

[edit]

Several small islets occur all around Bristol Island. The largest ones (more than 1 km, 0.62 mi) lie all west of Turmoil Point and consist of Grindle Rock, Wilson Rock and Freezland Rock.[11] Grindle Rock (Spanish: Roca Cerretti) has a height of 213 metres (700 ft) and lies 0.7 nautical miles (1.3 km) west of the island.[19] It is the easternmost of the chain of rocks extending WSW from Turmoil Point, the westernmost point of Bristol Island. Wilson Rock has a height of 183 m and lies 1.4 nautical miles (2.6 km) west of Bristol Island and in the middle of the three chain of rocks. Freezland Rock has a height of 305 metres (1,000 ft) high and is located 2 nautical miles (4 km) west of the island, also forming the westernmost of the chain of rocks.[20]

These islets and numerous sea stacks formed through coastal erosion.[21] The submarine portion of Bristol Island has an irregular shape, especially in the north and west where it extends to some distance from the coastline.[5] A shallow shelf of less than 180 metres (590 ft) depth surrounds the island especially in the west, where it forms Freezland Bank. Towards the seafloor, Bristol Island widens to a diameter of 90 kilometres (56 mi).[22] Numerous submarine sector collapse scars surround the island especially on its southern side, while a ridge and a secondary seamount[23] and secondary volcanism lie due west and extend 14 kilometres (8.7 mi) from Bristol.[21]

## Geology

[edit]

East of the South Sandwich Islands, the South America Plate subducts beneath the Scotia Plate at a rate of 70 millimetres per year (2.8 in/year). The subduction is responsible for the existence of the South Sandwich island arc, which is constituted by about eleven islands[3] in an eastward curving chain,[24] and submarine volcanoes including Protector in the north and Adventure and Kemp in the south.[25] From north to south, the islands are Zavodovski Island, Leskov Island, Visokoi Island, Candlemas Island–Vindication Island, Saunders Island, Montagu Island, Bristol Island–Freezland Rock, Bellingshausen Island, and Cook Island–Thule Island. Most of the islands are stratovolcanoes of various sizes.[26]

### Composition

[edit]

The principal volcanic rock of Bristol Island is basalt. Freezland Rock consists of andesite[27] which – unlike the potassium-poor tholeiites of the main island[28] – defines a calc-alkaline suite. Phenocrysts in both series include augite, hypersthene, olivine and plagioclase.[8] Tyrrel suspected that schists found encased in an iceberg may come from Bristol Island.[29] Isotope ratios of hafnium imply that the magma was formed with involvement of subducted pelagic sediments.[30]

## Discovery

[edit]

The three rocks lying west of the island, Grindle, Wilson, and Freezland, were all first discovered by the expedition of British Captain James Cook in 1775. Grindle rock was recharted in 1930 by Discovery Investigations personnel on the Discovery II and named by them for Sir Gilbert E.A. Grindle, Permanent Under-Secretary of State for the British Colonies.[19] Wilson rock was later more accurately charted by Admiral Thaddeus Bellingshausen in 1819–20 and recharted again in 1930 by DI personnel on the Discovery II who named it for Sir Samuel H. Wilson, Permanent Under-Secretary of State for British Colonies. Freezland rock was originally named "Freezland Peak" by Captain Cook on his 1775 expedition after Samuel Freezland, the seaman who first sighted it and so discovered the South Sandwich group. Cook's chart, showing the feature as an insular rock, was verified in 1930 by Discovery Investigations personnel on the Discovery II and the terminology had been altered accordingly from "peak" to "rock".[20][31]

Of the island's points, Turmoil Point was named by United Kingdom Antarctic Place-Names Committee (UK-APC) for the violent air streams commonly encountered during flying operations from HMS seas typical of the locality.[peacock prose] Trulla Bluff was initially named "Glacier Bluff" during the survey of the island by RRS to avoid duplication. The new name refers to the Norwegian whaling vessel Trulla which visited the islands in 1911. Fryer Point was charted in 1930 by Discovery Investigations personnel on the Discovery II and named for Lieutenant Commander D.H. Fryer, Royal Navy, captain of H.M. Surveying Ship Fitzroy.[12] Although the island was discovered by a British expedition under James Cook in 1775, Harker Point was unnamed until it was surveyed in 1930 by a team on the staff of the Discovery Committee.[13]

## Eruption history

[edit]

The oldest rock in the South Sandwich Islands is found at Bristol Island:[32] A sample from Freezland Rock has yielded an age of 3.1±0.1 million years by potassium-argon dating.[27] It, the rocks at Turmoil Point and the stacks between them may be part of an older, now eroded volcano[8] made up by alternating dykes, lava flows and tuffs.[18] The bulk of Bristol Island was probably built by emissions from the Sourabaya, Darnley and Havfruen centres and includes lava flows that form some of the capes,[33] although bathymetric data imply that it mostly pre-dates the Freezland Rock volcano.[23]

Recorded activity at Bristol goes back 150 years.[4] Eruptions have been observed in 1823, 1935-1936, 1950 and 1956,[34] and traces of very recent eruptions in 1964. A steaming crater was reported in 1962[11] which is presently buried under snow and ice.[35] The eruptions produced scoria cones[36] and reached volcanic explosivity indexes of 2-3.[37] Historical eruptions have been centered on Mount Sourabaya[18] and a crater on the western flank.[10] The activity on Bristol Island led the Argentines in 1956 to abandon the refuge hut they had installed on Thule Island farther south,[38] causing them to drop their plan to establish a permanent base there.[39] A sulfate anomaly in the EPICA ice core from Dronning Maud Land, Antarctica, has been attributed to the 1956 eruption.[40] Tephra layers in the East Antarctic Ice Sheet[41] \- such as in an ice core from Siple Dome \- may come from the 1935 eruption[42] although an origin at Cerro Azul in Chile is also possible.[43]

In 2005, three overlapping craters cropped out from the ice at Mount Sourabaya, with another crater 1 kilometre (0.62 mi) farther east.[35] During April-July 2016, an eruption at Mount Sourabaya emplaced two lava flows and produced ash emissions that were visible from satellites[18] and led to the issuance of volcanic ash advisories.[44] Temperature anomalies indicative of fumaroles are visible from satellites[45] and are centered on the crater of Mount Sourabaya.[46] Helicopter-assisted ascents to the summit of Mount Sourabaya have found hot ground.[47] Ice is melted in the proximity of active craters[27] but otherwise volcanic impacts on the ice cover are minimal.[36]

## Ecology

[edit]

Algae and lichens grow where there is exposed rock,[48] but unlike on many other South Sandwich Islands no vegetation is associated with volcanically heated ground.[49] Bryophytes including mosses have been recovered from Freezland Rock. Penguins form colonies on Bristol Island, including one with thousands of individuals on Freezland Rock,[50] and seabirds like Antarctic fulmars[51] and imperial shags also breed on Bristol,[52] although their populations are smaller here than on the other South Sandwich Islands[53] and they may be impacted by volcanic activity.[54] Penguin colonies are concentrated on headlands where the island is not ice covered.[55] Isopods occur in supralittoral pools.[56] Bryozoans have been recovered from shallow waters around Bristol.[57]

## See also

[edit]

* List of Antarctic and sub-Antarctic islands
* List of volcanoes in South Sandwich Islands

## References

[edit]

1. ^ Barr 2000, p. 318.
2. ^ Lynch et al. 2016, p. 1615.
3. ^ a b LeMasurier et al. 1990, p. 361.
4. ^ a b Rogers, Yesson & Gravestock 2015, p. 22.
5. ^ a b Nowell 2019, p. 192.
6. ^ Holdgate & Baker 1979, p. 4.
7. ^ Holdgate & Baker 1979, p. 5.
8. ^ a b c d LeMasurier et al. 1990, p. 385.
9. ^ a b Patrick & Smellie 2013, p. 490.
10. ^ a b c GVP 2023, General Information.
11. ^ a b c d LeMasurier et al. 1990, p. 384.
12. ^ a b Gnis-FRY 2012.
13. ^ a b USGS-HKP 2002.
14. ^ a b Holdgate & Baker 1979, p. 51.
15. ^ Holdgate & Baker 1979, p. 50.
16. ^ Holdgate & Baker 1979, p. 52.
17. ^ GVP 2023, Synonyms & Subfeatures.
18. ^ a b c d Liu et al. 2020, p. 14.
19. ^ a b Gnis-Gr 2012.
20. ^ a b Gnis-Fr 2012.
21. ^ a b Leat et al. 2013, p. 73.
22. ^ Leat et al. 2013, p. 67.
23. ^ a b Leat et al. 2013, p. 68.
24. ^ Holdgate & Baker 1979, p. 3.
25. ^ Leat et al. 2010, p. 111.
26. ^ LeMasurier et al. 1990, p. 362.
27. ^ a b c LeMasurier et al. 1990, p. 363.
28. ^ Pearce et al. 1995, p. 1077.
29. ^ Matthews 1959, p. 433.
30. ^ Barry et al. 2006, p. 240.
31. ^ Gna 2012.
32. ^ Baker, Buckley & Rex 1977, p. 134.
33. ^ Holdgate & Baker 1979, p. 53.
34. ^ GVP 2023, Eruption history.
35. ^ a b Patrick & Smellie 2013, p. 489.
36. ^ a b Smellie & Edwards 2016, p. 17.
37. ^ GVP 2023, Eruptive history.
38. ^ Holdgate & Baker 1979, p. 6.
39. ^ PR 1958, p. 243.
40. ^ Fischer 2004, p. 1.
41. ^ Tavares et al. 2020, p. 10.
42. ^ Kurbatov et al. 2006, p. 7.
43. ^ Karlöf et al. 2000, p. 12476.
44. ^ GVP 2023, Latest Activity Reports.
45. ^ Patrick & Smellie 2013, p. 479.
46. ^ Patrick & Smellie 2013, p. 496.
47. ^ Convey et al. 2000, p. 1287.
48. ^ Longton & Holdgate 1979, p. 1.
49. ^ Convey et al. 2000, p. 1282.
50. ^ Longton & Holdgate 1979, p. 43.
51. ^ Rogers, Yesson & Gravestock 2015, p. 112.
52. ^ Holdgate & Baker 1979, p. 54.
53. ^ Lynch et al. 2016, p. 1621.
54. ^ Hart & Convey 2018, p. 26.
55. ^ Holdgate & Baker 1979, p. 71.
56. ^ Hart & Convey 2018, p. 25.
57. ^ Rogers, Yesson & Gravestock 2015, p. 52.

### Sources

[edit]

This article incorporates public domain material from "Bristol Island". Geographic Names Information System. United States Geological Survey.   This article incorporates public domain material from "Bristol Island". Geographic Names Information System. United States Geological Survey.  This article incorporates public domain material from "Bristol Island". Geographic Names Information System. United States Geological Survey.  This article incorporates public domain material from "Bristol Island". Geographic Names Information System. United States Geological Survey.

* Baker, P. E.; Buckley, F.; Rex, D. C. (1977). "Cenozoic Volcanism in the Antarctic". Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences. 279 (963): 131–142\. Bibcode:1977RSPTB.279..131B. doi:10.1098/rstb.1977.0078. ISSN 0080-4622. JSTOR 2417758.
* Barr, William (October 2000). "First landings on Zavodovski Island, South Sandwich Islands, 1819". Polar Record. 36 (199): 317–322\. Bibcode:2000PoRec..36..317B. doi:10.1017/S0032247400016806. ISSN 1475-3057. S2CID 130347679.
* Barry, T. L.; Pearce, J. A.; Leat, P. T.; Millar, I. L.; le Roex, A. P. (15 December 2006). "Hf isotope evidence for selective mobility of high-field-strength elements in a subduction setting: South Sandwich Islands". Earth and Planetary Science Letters. 252 (3): 223–244\. Bibcode:2006E&PSL.252..223B. doi:10.1016/j.epsl.2006.09.034.
* Convey, P.; Lewis Smith, R. I.; Hodgson, D. A.; Peat, H. J. (November 2000). "The flora of the South Sandwich Islands, with particular reference to the influence of geothermal heating". Journal of Biogeography. 27 (6): 1279–1295\. Bibcode:2000JBiog..27.1279C. doi:10.1046/j.1365-2699.2000.00512.x. S2CID 86399142.
* Fischer, H. (2004). "Prevalence of the Antarctic Circumpolar Wave over the last two millenia recorded in Dronning Maud Land ice". Geophysical Research Letters. 31 (8). Bibcode:2004GeoRL..31.8202F. doi:10.1029/2003GL019186. S2CID 129855086.
* Alberts, Fred G., ed. (June 1995). Geographic Names of the Antarctic (PDF) (second ed.). United States Board on Geographic Names. p. 259. Retrieved 5 April 2012.
* "Freezland Rock". Geographic Names Information System. United States Geological Survey, United States Department of the Interior. Retrieved 9 April 2012.
* "Fryer Point". Geographic Names Information System. United States Geological Survey, United States Department of the Interior. Retrieved 11 April 2012.
* "Grindle Rock". Geographic Names Information System. United States Geological Survey, United States Department of the Interior. Retrieved 8 May 2012.
* "Bristol Island". Global Volcanism Program. Smithsonian Institution. Retrieved 22 September 2023.
* Hart, Tom; Convey, Peter (18 June 2018). "The South Sandwich Islands – a community of meta-populations across all trophic levels". Biodiversity. 19 (1–2): 1–14\. doi:10.1080/14888386.2018.1464952. S2CID 133771224.1–2&rft.pages=1-14&rft.date=2018-06-18&rft_id=info:doi/10.1080/14888386.2018.1464952&rft_id=https://api.semanticscholar.org/CorpusID:133771224#id-name=S2CID&rft.aulast=Hart&rft.aufirst=Tom&rft.au=Convey,+Peter&rft_id=https://ora.ox.ac.uk/objects/uuid:3227554e-fe19-48c8-8db9-983fbc1d19b0&rfr_id=info:sid/en.wikipedia.org:Bristol+Island" class="Z3988">
* Holdgate, M.W.; Baker, P.E. (1979). "The South Sandwich Islands: I. General description" (PDF). British Antarctic Survey Scientific Reports. 91. Cambridge: British Antarctic Survey: 76.
* Karlöf, L.; Winther, J.-G.; Isaksson, E.; Kohler, J.; Pinglot, J. F.; Wilhelms, F.; Hansson, M.; Holmlund, P.; Nyman, M.; Pettersson, R.; Stenberg, M.; Thomassen, M. P. A.; van der Veen, C.; van de Wal, R. S. W. (27 May 2000). "A 1500 year record of accumulation at Amundsenisen western Dronning Maud Land, Antarctica, derived from electrical and radioactive measurements on a 120 m ice core". Journal of Geophysical Research: Atmospheres. 105 (D10): 12471–12483\. Bibcode:2000JGR...10512471K. doi:10.1029/1999JD901119. hdl:11250/174200.
* Kurbatov, A. V.; Zielinski, G. A.; Dunbar, N. W.; Mayewski, P. A.; Meyerson, E. A.; Sneed, S. B.; Taylor, K. C. (2006). "A 12,000 year record of explosive volcanism in the Siple Dome Ice Core, West Antarctica". Journal of Geophysical Research. 111 (D12). Bibcode:2006JGRD..11112307K. doi:10.1029/2005JD006072. ISSN 0148-0227.
* Leat, Philip T.; Tate, Alex J.; Tappin, David R.; Day, Simon J.; Owen, Matthew J. (September 2010). "Growth and mass wasting of volcanic centers in the northern South Sandwich arc, South Atlantic, revealed by new multibeam mapping". Marine Geology. 275 (1–4): 110–126\. Bibcode:2010MGeol.275..110L. doi:10.1016/j.margeo.2010.05.001.1–4&rft.pages=110-126&rft.date=2010-09&rft_id=info:doi/10.1016/j.margeo.2010.05.001&rft_id=info:bibcode/2010MGeol.275..110L&rft.aulast=Leat&rft.aufirst=Philip+T.&rft.au=Tate,+Alex+J.&rft.au=Tappin,+David+R.&rft.au=Day,+Simon+J.&rft.au=Owen,+Matthew+J.&rft_id=https://doi.org/10.1016/j.margeo.2010.05.001&rfr_id=info:sid/en.wikipedia.org:Bristol+Island" class="Z3988">
* Leat, Philip T.; Day, Simon J.; Tate, Alex J.; Martin, Tara J.; Owen, Matthew J.; Tappin, David R. (September 2013). "Volcanic evolution of the South Sandwich volcanic arc, South Atlantic, from multibeam bathymetry". Journal of Volcanology and Geothermal Research. 265: 60–77\. Bibcode:2013JVGR..265...60L. doi:10.1016/j.jvolgeores.2013.08.013.
* LeMasurier, W.E.; Thomson, J.W.; Baker, P.E.; Kyle, P.R.; Rowley, P.D.; Smellie, J.L.; Verwoerd, W.J., eds. (1990). Volcanoes of the Antarctic Plate and Southern Oceans. Antarctic Research Series. Vol. 48\. Washington, D. C.: American Geophysical Union. doi:10.1029/ar048. ISBN 978-0-87590-172-5.
* Liu, Emma J.; Wood, Kieran; Aiuppa, Alessandro; Giudice, Gaetano; Bitetto, Marcello; Fischer, Tobias P.; McCormick Kilbride, Brendan T.; Plank, Terry; Hart, Tom (11 December 2020). "Volcanic activity and gas emissions along the South Sandwich Arc". Bulletin of Volcanology. 83 (1): 3. doi:10.1007/s00445-020-01415-2. hdl:10447/498775. ISSN 1432-0819. S2CID 228086712.
* Longton, R.E.; Holdgate, M.W. (1979). "The South Sandwich Islands: IV. Botany" (PDF). British Antarctic Survey Scientific Reports. 94. Cambridge: British Antarctic Survey: 53.
* Lynch, Heather J.; White, Richard; Naveen, Ron; Black, Andy; Meixler, Marcia S.; Fagan, William F. (1 September 2016). "In stark contrast to widespread declines along the Scotia Arc, a survey of the South Sandwich Islands finds a robust seabird community". Polar Biology. 39 (9): 1615–1625\. Bibcode:2016PoBio..39.1615L. doi:10.1007/s00300-015-1886-6. ISSN 1432-2056. S2CID 253814987.
* Matthews, D. H. (December 1959). "Aspects of the Geology of the Scotia Arc". Geological Magazine. 96 (6): 425–441\. Bibcode:1959GeoM...96..425M. doi:10.1017/S0016756800067091. ISSN 1469-5081. S2CID 129161650.
* Nowell, David (September 2019). "Bathymetric and geological maps from the British Antarctic Survey". Geology Today. 35 (5): 186–195\. Bibcode:2019GeolT..35..186N. doi:10.1111/gto.12285. S2CID 210308083.
* Patrick, Matthew R.; Smellie, John L. (August 2013). "Synthesis A spaceborne inventory of volcanic activity in Antarctica and southern oceans, 2000–10". Antarctic Science. 25 (4): 475–500\. Bibcode:2013AntSc..25..475P. doi:10.1017/S0954102013000436. ISSN 0954-1020. S2CID 128905897.
* Pearce, J. A.; Baker, P. E.; Harvey, P. K.; Luff, I. W. (1 August 1995). "Geochemical Evidence for Subduction Fluxes, Mantle Melting and Fractional Crystallization Beneath the South Sandwich Island Arc". Journal of Petrology. 36 (4): 1073–1109\. doi:10.1093/petrology/36.4.1073.
* "Argentine Antarctic Expedition, 1956–57". Polar Record. 9 (60): 242–243\. September 1958. Bibcode:1958PoRec...9R.242.. doi:10.1017/S0032247400065797. ISSN 1475-3057. S2CID 251053112.
* Rogers, Alex D.; Yesson, Christopher; Gravestock, Pippa (1 January 2015), Curry, Barbara E. (ed.), "Chapter One - A Biophysical and Economic Profile of South Georgia and the South Sandwich Islands as Potential Large-Scale Antarctic Protected Areas", Advances in Marine Biology, 70, Academic Press: 1–286, doi:10.1016/bs.amb.2015.06.001, PMID 26296718, retrieved 22 September 2023
* Smellie, John L.; Edwards, Benjamin R. (2016). Glaciovolcanism on Earth and Mars: Products, Processes and Palaeoenvironmental Significance. Cambridge: Cambridge University Press. ISBN 978-1-107-03739-7.
* Tavares, Flavia A.; SimõEs, Jefferson C.; Bernardo, Ronaldo T.; Gerhard, Nicoli P.; Casassa, Gino; Marquetto, Luciano (22 October 2020). "Razões de isótopos estáveis em um testemunho de firn do manto de gelo da Antártica Oriental". Pesquisas em Geociências (in Portuguese). 47 (2): e094026. doi:10.22456/1807-9806.108585. ISSN 1807-9806. S2CID 226351415.
* ""Feature Name: Harker"". United States Geological Survey. 2002. Retrieved 10 May 2007.`{{cite web}}`: CS1 maint: url-status (link)

## External links

[edit]

* Hogg, Oliver T.; Downie, Anna-Leena; Vieira, Rui P.; Darby, Chris (2021). "Macrobenthic Assessment of the South Sandwich Islands Reveals a Biogeographically Distinct Polar Archipelago". Frontiers in Marine Science. 8. doi:10.3389/fmars.2021.650241. ISSN 2296-7745.

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