Mount Rittmann

Mount Rittmann
Mount Rittmann is located in Antarctica
Mount Rittmann
Highest point
Elevation2,600 m (8,500 ft)[1]
Coordinates73°27′S 165°30′E / 73.45°S 165.5°E / -73.45; 165.5[1]
Naming
EtymologyVolcanologist Alfred Rittmann
Geography
Parent rangeMountaineer Range
Geology
Age of rockPliocene
Mountain typeVolcano
Volcanic beltMcMurdo Volcanic Group
Last eruption>1254 CE

Mount Rittmann is a volcano in Antarctica. Discovered in 1988–1989 by an Italian expedition, it was named after the volcanologist Alfred Rittmann (1893–1980). It features a 2 kilometres (1.2 mi) or 8 by 5 kilometres (5.0 mi × 3.1 mi) wide caldera which crops out from underneath the Aviator Glacier. The volcano was active during the Pliocene and into the Holocene, including large explosive eruptions; a major eruption occurred in 1254 CE and deposited tephra over much of Antarctica. Currently, the volcano is classified as dormant.

The volcano is fumarolically active. The geothermal activity keeps part of the caldera ice-free; mosses and various microorganisms grow on this ice-free terrain. Such an occurrence of mosses on fumarolically active volcanoes of Antarctica is limited to Mount Rittmann, Mount Melbourne and Mount Erebus and has led to efforts to establish a protected area on the volcano.

Geography and geomorphology

It lies in Victoria Land on the Ross Sea,[2] 100 kilometres (62 mi) from Terranova Bay[3] and 150 kilometres (93 mi) from the Italian Mario Zucchelli Station.[4] It was discovered by an Italian expedition in 1988–1989[5] and named in honour of the volcanologist Alfred Rittmann.[6] Owing to having only been recently discovered and being remote, the volcano is poorly studied.[7]

Mount Rittmann is 2,600 metres (8,500 ft) high[1] and lies in the Mountaineer Range.[5] A 2 kilometres (1.2 mi)[8] or 8 by 5 kilometres (5.0 mi × 3.1 mi) wide caldera is located underneath the Aviator Glacier;[1] it is outlined by a ring of volcanic hills and outcrops[5] that emerge slightly[9] from an almost flat surrounding terrain.[10] The name Mt. Rittmann is sometimes applied to a fumarolically active nunatak on the caldera rim.[11] The base of the volcano crops out from the Pilot Glacier,[5] which together with the caldera is one of the few parts of the[6] otherwise snow- and ice-covered volcano[2] that aren't encased in ice.[6] Outcrops consist of hyaloclastites, lava flows and pillow lavas.[10]

Fumaroles and their ecosystems

An Italian expedition in 1990–1991 discovered heated ground and fumaroles at the caldera, implying that molten magma exists underneath the volcano.[5] The fumarolic activity occurs at a 200 metres (660 ft) wide and 80 metres (260 ft) high face[12] with sandy-gravelly soil;[13] another warm area is reported from the lower slopes.[2]

The vents of the fumaroles are centimetres wide and surrounded by efflorescences formed by hydrothermally altered rocks.[5] Fumarolic gases contain carbon dioxide and methane and lack hydrogen sulfide and sulfur dioxide.[14] The fumaroles keep an area of the caldera at 2,250 metres (7,380 ft) elevation ice-free;[2] at 2,100 metres (6,900 ft) elevation mean temperatures are −20 °C (−4 °F), but fumarolic activity heats the surrounding rocks up to 60 °C (140 °F).[3] Surface temperatures reach 43.4 °C (110.1 °F).[12]

Patches of[2] moss grow in rosette form[15] on sandy soil in the fumarolic areas[2] at temperatures of 17–35 °C (63–95 °F).[16] A steady supply of water, the fumarolic warmth and shelter allow the growth of this vegetation;[2] such volcanic vegetation is also found at volcanoes Mount Erebus and Mount Melbourne.[5] The mosses may have arrived there by wind;[17] Pohlia nutans, the moss found at Mount Rittmann, is a cosmopolitan species which is also encountered elsewhere in Victoria Land.[18] Genetic analysis indicates that the mosses growing at Mount Rittmann arrived there in one event and are not diverse.[19]

Research on microbial communities at Mount Rittmann fumaroles has found bacteria including cyanobacteria,[20] fungi including yeast[21] and cyanobacterial microbial mats.[22] Algae and protozoa have been identified at Mount Rittmann fumaroles.[18] The bacterial species Anoxybacillus amylolyticus[23] and the subspecies Alicyclobacillus acidocaldarius subsp. rittmannii were discovered at fumaroles of Mount Rittmann,[24] and the bacterium Bacillus fumarioli was cultured from Mount Rittmann and Mount Melbourne.[25] Alicyclobacillus acidocaldarius subsp. rittmannii is used in studied of thermophilic enzymes.[26] Another thermophilic bacteria reported from Mount Rittmann is Aneurinibacillus terranovensis.[27]

Together with Deception Island, Mount Erebus and Mount Melbourne, Mount Rittmann is one of the four volcanoes in Antarctica with known geothermal habitats[28] and the least studied of these.[4] Three other volcanoes show evidence of past or present fumarolic activity.[28]

There are efforts by Antarctica New Zealand to establish an Antarctic Specially Protected Area (ASPA) on Mount Rittmann,[13] and in 2014 Mount Rittmann was reportedly part of ASPA 175.[29]

Geology

The volcano is part of the McMurdo Volcanic Group, one of the largest provinces of alkaline volcanism in the world. It has been subdivided into four subprovinces; Mount Rittmann is considered part of the Melbourne subprovince[5] or of the Mount Overlord volcanic field.[30] The volcanic province is related to the tectonic events that occurred during the rifting of the Ross Sea. Activity commenced during the Eocene-Oligocene and continued into the Holocene.[10]

The outcrops around the caldera rim are formed by breccia, which contains juvenile pumice and xenoliths.[5] The volcanic rocks define a basanitic, hawaiitic, mugearitic,[31] phonolithic and trachytic suite[10] that is alkaline and sodic[32] and features olivine and plagioclase phenocrysts.[31] Xenoliths include both granite and metamorphic rocks from the basement and volcanic rocks.[10] Hydrothermal alteration has occurred close to the fumaroles.[33]

Eruption history

The volcano is of Pliocene age[34] and was active between 4 million years ago and 70,000 years ago,[1] although the oldest rocks may actually be from a separate volcano.[35] Radiometric dating has yielded ages of 3.97 million years for rocks at the base of Mount Rittmann and 240,000 ± 200,000, 170,000 ± 20,000 and 70,000 ± 20,000 years ago for lava flows.[30] The caldera appears to be younger than the volcanic rocks at Pilot Glacier,[5] although its unimpressive topographical expression might indicate an old age.[35] It was possibly formed by a Plinian eruption.[36] Tephra deposits at Outback Nunataks,[37] various marine and ice core tephras,[38] Eemian-age tephras at Talos Dome in East Antarctica[39] and dust bands found in blue-ice areas of Frontier Mountain and Lichen Hill in Victoria Land may originate from Mount Rittmann,[30] and at least four large eruptions took place in the last 74,000 years.[38] The eruption history of the volcano is poorly known due to the scarcity of outcrops.[40]

About 11,000 years ago, Mount Rittmann had a large explosive eruption which deposited the "Aviator Tephra" in the Aviator Basin of the Ross Sea. Reconstructions imply that the eruption commenced as a hydromagmatic event which then transitioned into a Plinian eruption which yielded lapilli and volcanic ash.[41] Presumably, the volcano was ice-clad when the eruption commenced and meltwater from the ice interacted with the magma to trigger hydromagmatic activity.[38] At the end, a caldera collapse may have occurred, and the volcano produced ignimbrites.[41]

Tephrochronology has found evidence that Mount Rittmann erupted in 1254[42] and deposited a tephra layer across Antarctica.[43] This Rittmann tephra[44] or "1254 C.E. tephra" has been identified in ice cores of East and West Antarctica;[43] its discovery at Edisto Inlet expands its occurrence to an area of over 950,000 square kilometres (370,000 sq mi) all around the volcano and to distances of over 2,000 kilometres (1,200 mi). Magma was efficiently fragmented during the eruption,[42] which may[44] or may not have been intense.[42] It probably was one of the largest Holocene eruptions of Antarctica;[44] before its source at Mount Rittmann was discovered it was attributed to The Pleiades volcanoes.[8]

Additional eruptions may have occurred after 1254.[8] Presently, the volcano is considered quiescent[34] and is not monitored[11] although a seismo-tectonic station was installed in its vicinity[45] and has recorded seismic activity, some of which may be due to ice movements and the other of volcanic origin.[46] Small thermal anomalies have been observed from Landsat satellite images and may correspond to fumarolic activity.[47] A repeat of the 1254 eruption could form a long-lasting ash cloud, ashfall on nearby research stations[48] and disruption of air traffic to and from McMurdo Station.[11]

References

  1. ^ a b c d e "Mount Rittmann". Global Volcanism Program. Smithsonian Institution.
  2. ^ a b c d e f g Skotnicki, Bargagli & Ninham 2002, p. 771.
  3. ^ a b Nicolaus et al. 1998, p. 134.
  4. ^ a b Herbold, McDonald & Cary 2014, p. 185.
  5. ^ a b c d e f g h i j Bargagli, Broady & Walton 2004, p. 121.
  6. ^ a b c Armienti & Tripodo 1991, p. 427.
  7. ^ Gambino et al. 2021, p. 751.
  8. ^ a b c Lee et al. 2019, p. 174.
  9. ^ Gambino et al. 2021, p. 748.
  10. ^ a b c d e Armienti & Tripodo 1991, p. 430.
  11. ^ a b c Lee et al. 2019, p. 175.
  12. ^ a b Herbold, McDonald & Cary 2014, p. 189.
  13. ^ a b Herbold, McDonald & Cary 2014, p. 190.
  14. ^ Gambino et al. 2021, p. 754.
  15. ^ Smith, R. I. Lewis (March 2005). "The thermophilic bryoflora of Deception Island: unique plant communities as a criterion for designating an Antarctic Specially Protected Area". Antarctic Science. 17 (1): 25. Bibcode:2005AntSc..17...17S. doi:10.1017/S0954102005002385. ISSN 1365-2079. S2CID 129016393.
  16. ^ Herbold, McDonald & Cary 2014, p. 201.
  17. ^ Skotnicki, Bargagli & Ninham 2002, p. 776.
  18. ^ a b Bargagli, Broady & Walton 2004, p. 125.
  19. ^ Bergstrom, D. M.; Convey, P.; Huiskes, A. H. L., eds. (2006). Trends in Antarctic Terrestrial and Limnetic Ecosystems: Antarctica as a Global Indicator. Dordrecht: Springer Netherlands. p. 164. doi:10.1007/1-4020-5277-4. ISBN 978-1-4020-5276-7.
  20. ^ Herbold, McDonald & Cary 2014, pp. 194–195.
  21. ^ Herbold, McDonald & Cary 2014, p. 196.
  22. ^ Herbold, McDonald & Cary 2014, p. 204.
  23. ^ Poli, Annarita; Esposito, Enrico; Lama, Licia; Orlando, Pierangelo; Nicolaus, Giancarlo; de Appolonia, Francesca; Gambacorta, Agata; Nicolaus, Barbara (June 2006). "Anoxybacillus amylolyticus sp. nov., a thermophilic amylase producing bacterium isolated from Mount Rittmann (Antarctica)". Systematic and Applied Microbiology. 29 (4): 300–307. doi:10.1016/j.syapm.2005.10.003. PMID 16682297.
  24. ^ Nicolaus et al. 1998, p. 140.
  25. ^ Flores, Patricio A.; Amenábar, Maximiliano J.; Blamey, Jenny M. (2013), Satyanarayana, Tulasi; Littlechild, Jennifer; Kawarabayasi, Yutaka (eds.), "Hot Environments from Antarctica: Source of Thermophiles and Hyperthermophiles, with Potential Biotechnological Applications", Thermophilic Microbes in Environmental and Industrial Biotechnology: Biotechnology of Thermophiles, Springer Netherlands, p. 101, doi:10.1007/978-94-007-5899-5_3, ISBN 978-94-007-5899-5
  26. ^ Herbold, McDonald & Cary 2014, p. 206.
  27. ^ Kirby, Bronwyn M.; Easton, Samantha; Tuffin, I. Marla; Cowan, Don A. (2012-01-01). "Bacterial Diversity in Polar Habitats". Polar Microbiology: Life in a Deep Freeze: 12. doi:10.1128/9781555817183.ch1. ISBN 9781555816049.
  28. ^ a b Herbold, McDonald & Cary 2014, p. 184.
  29. ^ "Management Plan For Antarctic Specially Protected Area No. 175 HIGH ALTITUDE GEOTHERMAL SITES OF THE ROSS SEA REGION (including parts of the summits of Mount Erebus, Ross Island and Mount Melbourne and Mount Rittmann, northern Victoria Land)" (PDF). Antarctic Treaty Secretariat (ATS). 2014. Retrieved 27 January 2020.
  30. ^ a b c Perchiazzi, Natale; Folco, Luigi; Mellini, Marcello (6 May 2004). "Volcanic ash bands in the Frontier Mountain and Lichen Hills blue-ice fields, northern Victoria Land". Antarctic Science. 11 (3): 360. doi:10.1017/S0954102099000449. S2CID 131337143 – via ResearchGate.
  31. ^ a b Armienti & Tripodo 1991, p. 432.
  32. ^ Armienti & Tripodo 1991, p. 431.
  33. ^ Bonaccorso et al. 1991, p. 455.
  34. ^ a b Narcisi et al. 2016, p. 71.
  35. ^ a b Smellie, John L.; Rocchi, Sergio (2021). "Chapter 5.1a Northern Victoria Land: volcanology". Geological Society, London, Memoirs. 55 (1): 371. doi:10.1144/M55-2018-60. ISSN 0435-4052. S2CID 233887403.
  36. ^ Armienti & Tripodo 1991, p. 442.
  37. ^ Baroni, Carlo; Frezzotti, Massimo; Salvatore, Maria Cristina; Meneghel, Mirco; Tabacco, Ignazio E.; Vittuari, Luca; Bondesan, Aldino; Biasini, Alessandro; Cimbelli, Alessandro; Orombelli, Giuseppe (2004). "Antarctic geomorphological and glaciological 1 : 250 000 map series: Mount Murchison quadrangle, northern Victoria Land. Explanatory notes". Annals of Glaciology. 39: 258. doi:10.3189/172756404781814131. hdl:11577/2460741. ISSN 0260-3055.
  38. ^ a b c Di Roberto et al. 2020, p. 16.
  39. ^ Narcisi et al. 2016, p. 69.
  40. ^ Del Carlo, P.; Di Roberto, A.; Di Vincenzo, G.; Bertagnini, A.; Landi, P.; Pompilio, M.; Colizza, E.; Giordano, G. (14 April 2015). "Late Pleistocene-Holocene volcanic activity in northern Victoria Land recorded in Ross Sea (Antarctica) marine sediments". Bulletin of Volcanology. 77 (5): 13. Bibcode:2015BVol...77...36D. doi:10.1007/s00445-015-0924-0. hdl:11368/2857700. ISSN 1432-0819. S2CID 129707264.
  41. ^ a b Di Roberto et al. 2020, p. 18.
  42. ^ a b c Di Roberto et al. 2019, p. 6.
  43. ^ a b Di Roberto et al. 2019, p. 5.
  44. ^ a b c Lee et al. 2019, p. 170.
  45. ^ Contrafatto, Danilo; Fasone, Rosario; Ferro, Angelo; Larocca, Graziano; Laudani, Giuseppe; Rapisarda, Salvatore; Scuderi, Luciano; Zuccarello, Luciano; Privitera, Eugenio; Cannata, Andrea (1 April 2018). "Design of a seismo-acoustic station for Antarctica". Review of Scientific Instruments. 89 (4): 3. Bibcode:2018RScI...89d4502C. doi:10.1063/1.5023481. ISSN 0034-6748. PMID 29716353. S2CID 19216985.
  46. ^ Gambino et al. 2021, p. 755.
  47. ^ 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): 4781. Bibcode:2013AntSc..25..475P. doi:10.1017/S0954102013000436. ISSN 0954-1020. S2CID 128905897.
  48. ^ Di Roberto et al. 2019, p. 7.
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