Recent extension driven by mantle upwelling at craton edge beneath the Admiralty Mountains (Ross Sea, East Antarctica)
Northern Victoria Land is located at the boundary between an extended, presumably hot, region (West Antarctic Rift System, WARS) and the thick, possibly cold East Antarctic craton. The style and timing of Tertiary deformation along with relationships with the magmatic activity are still unclear, and...
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| Language: | English |
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2007
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| Online Access: | http://hdl.handle.net/2122/2816 |
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ftingv:oai:www.earth-prints.org:2122/2816 |
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Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia) |
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English |
| topic |
Antarctica Extensional tectonic Mantle upwelling Seismic Tomography 04. Solid Earth::04.07. Tectonophysics::04.07.02. Geodynamics |
| spellingShingle |
Antarctica Extensional tectonic Mantle upwelling Seismic Tomography 04. Solid Earth::04.07. Tectonophysics::04.07.02. Geodynamics Faccenna, C. Rossetti, F. Becker, T. W. Danesi, S. Morelli, A. Recent extension driven by mantle upwelling at craton edge beneath the Admiralty Mountains (Ross Sea, East Antarctica) |
| topic_facet |
Antarctica Extensional tectonic Mantle upwelling Seismic Tomography 04. Solid Earth::04.07. Tectonophysics::04.07.02. Geodynamics |
| description |
Northern Victoria Land is located at the boundary between an extended, presumably hot, region (West Antarctic Rift System, WARS) and the thick, possibly cold East Antarctic craton. The style and timing of Tertiary deformation along with relationships with the magmatic activity are still unclear, and contrasting models have been proposed. We performed structural and morphotectonic analyses at the NE termination of northern Victoria Land in the Admiralty Mountains area, where the relationship between topography, tectonics and magmatism is expected to be well pronounced. We found evidence of two subsequent episodes of faulting, occurring concurrently with the Neogene Mc Murdo volcanism. The first episode is associated with dextral transtension and it is overprinted by extensional tectonics during the emplacement of large shield alkaline volcanoes. Upper mantle seismic tomography shows that the extensional regime is limited to regions overlying a low velocity anomaly. We interpret this anomaly to be of thermal origin, and have tested the role of large-scale upwelling on lithosphere deformation in the area. The results of this integrated analysis suggest that the morphotectonic setting of the region and the magmatism are likely the result of upwelling flow at the boundary between the cold cratonic and the hot stretched province (WARS), at work until recent time in this portion of the northern Victoria Land. Programma Nazionale di Ricerca in Antartide (PNRA) Submitted 3.3. Geodinamica e struttura dell'interno della Terra JCR Journal open |
| author2 |
Faccenna, C.; Dipartimento Scienze Geologiche, Università Roma TRE, Roma IT Rossetti, F.; Dipartimento Scienze Geologiche, Università Roma TRE, Roma IT Becker, T. W.; University of Southern California, Los Angeles CA (US) Danesi, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia Morelli, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia Dipartimento Scienze Geologiche, Università Roma TRE, Roma IT University of Southern California, Los Angeles CA (US) Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia |
| format |
Manuscript |
| author |
Faccenna, C. Rossetti, F. Becker, T. W. Danesi, S. Morelli, A. |
| author_facet |
Faccenna, C. Rossetti, F. Becker, T. W. Danesi, S. Morelli, A. |
| author_sort |
Faccenna, C. |
| title |
Recent extension driven by mantle upwelling at craton edge beneath the Admiralty Mountains (Ross Sea, East Antarctica) |
| title_short |
Recent extension driven by mantle upwelling at craton edge beneath the Admiralty Mountains (Ross Sea, East Antarctica) |
| title_full |
Recent extension driven by mantle upwelling at craton edge beneath the Admiralty Mountains (Ross Sea, East Antarctica) |
| title_fullStr |
Recent extension driven by mantle upwelling at craton edge beneath the Admiralty Mountains (Ross Sea, East Antarctica) |
| title_full_unstemmed |
Recent extension driven by mantle upwelling at craton edge beneath the Admiralty Mountains (Ross Sea, East Antarctica) |
| title_sort |
recent extension driven by mantle upwelling at craton edge beneath the admiralty mountains (ross sea, east antarctica) |
| publishDate |
2007 |
| url |
http://hdl.handle.net/2122/2816 |
| long_lat |
ENVELOPE(168.762,168.762,-71.788,-71.788) |
| geographic |
Admiralty Mountains Antarctic East Antarctica Ross Sea Victoria Land |
| geographic_facet |
Admiralty Mountains Antarctic East Antarctica Ross Sea Victoria Land |
| genre |
Antarc* Antarctic Antarctica Antartide East Antarctica Ross Sea Victoria Land |
| genre_facet |
Antarc* Antarctic Antarctica Antartide East Antarctica Ross Sea Victoria Land |
| op_relation |
Tectonics Artemieva M. I. (2007), Dynamic topography of the East European craton: Shedding light upon lithospheric structure, composition and mantle dynamics, Global and Planetary Change 58 (2007) 411 – 434. Balestrieri, M.L., G. Bigazzi, C. Ghezzo and B. Lombardo, (1994), Fission track dating of apatites from the Granite Harbour Intrusive Suite and uplift-denudation history of the Transantarctic Mountains in the area between the Mariner and David Glaciers (northern Victoria Land, Antarctica), Terra Antarctica, 1, 82-87. Bannister S., J. Yu, B. Leitner and B.L.N. Kennett (2003), Variations in the crustal structure across the transition from West to East Antarctica, Southern Victoria Land, Geophys. J. Int., 155(3), 870-880. Bannister S., R.K. Sneider and M.L. Passier (2000), Shear-wave velocities under the Transantarctic Mountains and Terror Rift from surface wave inversion, Geophys. Res. Lett., 27,281-284. Armienti P. and C. Baroni (1999), Cenozoic climatic change in Antarctica recorded by volcanic activity and landscape evolution, Geology, v. 27, p. 617–620, doi:10.1130/0091- 7613(1999)0272.3.CO;2. Baroni C., V. Noti, S. Ciccacci, G. Righini, M.C. Salvatore (2004) Fluvial origin of the valley system in northern Victoria Land (Antarctica) from quantitative geomorphic analysis, Geol. Soc. Am. Bull., v. 117; no. 1/2; p. 212–228; doi:10.1130/B25529.1. Becker, T. W. and O'Connell, R. J.: Predicting plate velocities with mantle circulation models, Geochem., Geophys., Geosys., 2, 2001GC000171, 2001. Becker, T., and L. Boschi (2002), A comparison of tomographic and geodynamic mantle models, Geochem. Geophys. Geosyst., 3(1), 1003, doi:10.1029/2001GC000168. Behrendt, J.C., W.E. LeMasurier, A.K. Cooper, F. Tessensohn, A. Trehu, D. Damaske, (1991) The West Antarctic Rift System: a review of geophysical investigations. In: Contributions to Antarctic Research II. Am. Geophys. Union, Antarct. Res. Ser. 53, 67–112. Behrendt, J.C. (1999) Crustal and lithospheric structure of the West Antarctic Rift System from geophysical investigations—a review, Glob. Planet. Change, 23, 25–44. Busetti M., G. Spadini, F. van der Wateren, S. Cloetingh, C. Zanolla (1999) Kinematic modelling of the West Antarctic Rift System, Ross Sea, Antarctica, Global and Planetary Change, 23 1999.79–103. Cande, S.C. and J.M. Stock (2004) Pacific–Antarctic–Australia motion and the formation of the Maquarie Plate. Geophys. J. Int., 157, 399–414. Cande, S.C., J.M. Stock, R.D. Muller and T. Ishihara, (2000) Cenozoic motion between East and West Antarctica, Nature, 404, 145–150. Cooper, A.K., H. Trey, G. Cochrane, F. Egloff, M. Busetti and Acrup Working Group (1997), Crustal structure of the Southern Central Trough, Western Ross Sea. In: Ricci, C.A. 14 Ed., The Antarctic Region: Geological Evolution and Processes. Proceedings of the VIIth International Symposium on Antarctic Earth Sciences, Siena 1995. Terra Antarctica Publications, pp. 637–642. Courtillot, V., A. Davaille, J. Besse, and J. Stock (2003) Three distinct types of hotspots in the Earth’s mantle, Earth and Planetary Science Letters, 205, p. 295–308. Danesi S. and A. Morelli (2001), Structure of the upper mantle under the Antarctic Plate from surface wave tomography, Geophys. Res. Lett., 28, 4395-4398. Danesi S. and A. Morelli (2004), Seismological imaging of the Antarctic continental lithosphere: a review, Gl. Planet. Ch., 42, 155-165. Davey, F. J., and L. De Santis (2005), A multi-phase rifting Model for the Victoria Land basin, Western Ross Sea, in Antarctica: Contributions to Global Earth Sciences, edited by D. K. Futterer et al., chap. 6.3, pp. 301–306, Springer, New York. Davey, F. J., and G. Brancolini (1995), The Late Mesozoic and Cenozoic structural setting of the Ross Sea region, in Geology and Seismic Stratigraphy of the Antarctic Margin, Antarct. Res. Ser., vol. 68, edited by A. K. Cooper, P. F. Barker, and G. Brancolini, pp. 167 – 182, AGU, Washington, D. C. Davey, F.J., , S.C. Cande, J.M. Stock, (2006) Extension in thewestern Ross Sea region— links between Adare Basin and Victoria Land Basin, Geophys. Res. Lett., 33, L20315, doi:10.1029/2006GL027383. Finn, C. A., R. D. Muller, and K. S. Panter (2005), A Cenozoic diffuse alkaline magmatic province (DAMP) in the southwest Pacific without rift or plume origin, Geochem. Geophys. Geosyst., 6, Q02005, doi:10.1029/2004GC000723 Fitzgerald, P.G. (1992), The Transantarctic Mountains of Southern Victoria Land: the application of apatite fission track analysis to a the application of apatite fission track analysis to a rift shoulder, Tectonics, 11, 634–662. Fitzgerald, P.G., A.J.W. Gleadow (1988) Fission-track geochronology, tectonics and structure of the Transantarctic Mountains in northern Victoria Land, Antarctica, Chem. Geol., 73, 169–198. GANOVEX Team (1987), Geological map of NorthVictoria Land, Antarctica, 1:500000 explanation notes. Geol. Jahrb., B66, 7-79. Hager B. H. and R. J. O'Connell, A simple global model of plate dynamics and mantle convectionJ. Geophys. Res. 86, 4843-4867, 1981. Hamilton, R., C.C. Sorlien, P. Luyendyk, , L.R. Bartek (2001) Cenozoic tectonics of the Cape Roberts rift basin and Transantarctic Mountains front, southwestern Ross Sea, Antarctica, Tectonics, 20, 325–342. Jordan, H. (1981), Tectonic observations in the Hallet Volcanic Province, Antarctica. Geol. Jb., B 41, 111 - 125. King, S.D. (2007) Hotspot and edge-driven convection, Geology, 35, 223-226, doi: 477 10.1130/G23291A.1 Läufer A., G. Kleindshmidt, F. Hejnes-Kunst, F. Rossetti, C. Faccenna (2006) Geological Map of the Cape Adare Quadrangle, north Victoria Land, Antarctica (Scale 1:250.000), BGR, Hannover, Germany. Lawrence J.F., D.A. Wiens, A.A. Nyblade, S. Anandakrishnan, P.J. Shore and D. Voigt (2006), Crust and upper mantle structure of the Transantarctic Mountains and surrounding regions from receiver functions, surface waves and gravity: Implication and uplift models, Geoch. Geophys. Geosys., 7, 10, Q10011, doi:10.1029/2006GC001282. Lawver L.A. and L.M. Gahagan (1994) Constraints on timing of extension in the Ross Sea region, Terra Antarctica, 1, 545-552. LeMasurier, W. E. (1990), Late Cenozoic volcanism on the Antarctic Plate: An overview, in Volcanoes of the Antarctic Plate and Southern Oceans, Antarct. Res. Ser., vol. 48, edited by W. E. LeMasurier and J. W. Thomson, pp. 1–18,AGU, Washington, D. C. Lisker F., A. L., A.L .Läufer, W M. Olesch, F. Rossetti and T. Schäfer (2006), Transantarctic Basin: new insights from fission trackand structural data from the USARPMountains and adjacent areas (NorthernVictoria Land,Antarctica), Basin Research, 18, 497-520. Lisker, F. (2002) Review of fission track studies in northern Victoria Land — passive margin evolution versus uplift of the Transantarctic Mountains, Tectonophysics, 349, 57–73. Lithgow-Bertelloni C. and J. H. Guynn (2004) Origin of the lithospheric stress field, Journal of Geophysical Research, vol. 109, B01408, 10.1029/2003JB002467. Mukasa, S. B. and I.W.D. Dalziel (2000), Marie Byrd Land, West Antarctica: Evolution of Gondwana’s Pacific margin constrained by zircon U-Pb geochronology and feldspar common Pb isotopic composition, Geological Society of America Bullettin, 112, 611-627. Muller, R. D., S. C. Cande, J. M. Stock, and W. R. Keller (2005), Crustal structure and rift flank uplift of the Adare Trough, Antarctica, Geochem. Geophys. Geosyst., 6, Q11010, doi:10.1029/2005GC001027. Redfield T.F. (1994), The Transantarctic Mountains and the breakup of Gondwana: uplift, underplating, and flexural suppression. Unpublished Ph.D. thesis, Arizona State University. Ritzwoller M.H., N.M. 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Tessensohn, F. and R.Wörner (1991), The Ross Sea Rift System: Structures, evolution and analogues. In: Thompson, M.R.A, Crame, J.A. & Thompson, J.W. (eds.), Geological Evolution of Antarctica, Cambridge Univ, Press, New York, 273-277. Tessensohn, F. (1994) The Ross Sea region, Antarctica: structural interpretation in relation to the evolution of the southern ocean, Terra Antart., 1, 553-558. Tonarini, S., S. Rocchi, P. Armienti, and F. Innocenti (1997), Constraints on timing of Ross Sea rifting inferred from Cainozoic intrusions from northern Victoria Land, Antarctica, in The Antarctic Region: Geological Evolution and Processes, Proceedings of the 7th International Symposium on Antarctic Earth Sciences, edited by C. A. Ricci. pp. 511–521, Terra Antarct., Siena, Italy. van der Beek, P., S. Cloetingh, and P. Andriessen (1994), Mechanisms of extensional basin formation and vertical motions at rift flanks: Constraints from tectonic modeling and fission track thermochronology, Earth Planet. Sci. Lett., 121, 417–433. Van der Wateren, F.M, T.J. Dunai, W. Klas, R.T. Van Balen, A.L. L.M. Verbers, U. Herpers, (1999), Contrasting Neogene denudation histories of regions in the Transantarctic Mountains, northern Victoria Land, Antarctica, constrained by cosmogenic nuclide measurements, Global Planet. Change, 23, 145–172. Wilson, T.J. (1995) Cenozoic transtension along the Transantarctic Mountains–West Antarctic rift boundary, Southern Victoria Land, Antarctica, Tectonics, 14, 531–545 Wörner, G. (1999), Lithospheric dynamics and mantle sources of alkaline magmatism of the Cenozoic West Antarctic Rift system, Global Planet. Change, 23(1–4), 61–77. http://hdl.handle.net/2122/2816 |
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ftingv:oai:www.earth-prints.org:2122/2816 2023-05-15T13:51:39+02:00 Recent extension driven by mantle upwelling at craton edge beneath the Admiralty Mountains (Ross Sea, East Antarctica) Faccenna, C. Rossetti, F. Becker, T. W. Danesi, S. Morelli, A. Faccenna, C.; Dipartimento Scienze Geologiche, Università Roma TRE, Roma IT Rossetti, F.; Dipartimento Scienze Geologiche, Università Roma TRE, Roma IT Becker, T. W.; University of Southern California, Los Angeles CA (US) Danesi, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia Morelli, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia Dipartimento Scienze Geologiche, Università Roma TRE, Roma IT University of Southern California, Los Angeles CA (US) Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia 2007 http://hdl.handle.net/2122/2816 en eng Tectonics Artemieva M. I. (2007), Dynamic topography of the East European craton: Shedding light upon lithospheric structure, composition and mantle dynamics, Global and Planetary Change 58 (2007) 411 – 434. Balestrieri, M.L., G. Bigazzi, C. Ghezzo and B. Lombardo, (1994), Fission track dating of apatites from the Granite Harbour Intrusive Suite and uplift-denudation history of the Transantarctic Mountains in the area between the Mariner and David Glaciers (northern Victoria Land, Antarctica), Terra Antarctica, 1, 82-87. Bannister S., J. Yu, B. Leitner and B.L.N. Kennett (2003), Variations in the crustal structure across the transition from West to East Antarctica, Southern Victoria Land, Geophys. J. Int., 155(3), 870-880. Bannister S., R.K. Sneider and M.L. Passier (2000), Shear-wave velocities under the Transantarctic Mountains and Terror Rift from surface wave inversion, Geophys. Res. Lett., 27,281-284. Armienti P. and C. Baroni (1999), Cenozoic climatic change in Antarctica recorded by volcanic activity and landscape evolution, Geology, v. 27, p. 617–620, doi:10.1130/0091- 7613(1999)0272.3.CO;2. Baroni C., V. Noti, S. Ciccacci, G. Righini, M.C. Salvatore (2004) Fluvial origin of the valley system in northern Victoria Land (Antarctica) from quantitative geomorphic analysis, Geol. Soc. Am. Bull., v. 117; no. 1/2; p. 212–228; doi:10.1130/B25529.1. Becker, T. W. and O'Connell, R. J.: Predicting plate velocities with mantle circulation models, Geochem., Geophys., Geosys., 2, 2001GC000171, 2001. Becker, T., and L. Boschi (2002), A comparison of tomographic and geodynamic mantle models, Geochem. Geophys. Geosyst., 3(1), 1003, doi:10.1029/2001GC000168. Behrendt, J.C., W.E. LeMasurier, A.K. Cooper, F. Tessensohn, A. Trehu, D. Damaske, (1991) The West Antarctic Rift System: a review of geophysical investigations. In: Contributions to Antarctic Research II. Am. Geophys. Union, Antarct. Res. Ser. 53, 67–112. Behrendt, J.C. (1999) Crustal and lithospheric structure of the West Antarctic Rift System from geophysical investigations—a review, Glob. Planet. Change, 23, 25–44. Busetti M., G. Spadini, F. van der Wateren, S. Cloetingh, C. Zanolla (1999) Kinematic modelling of the West Antarctic Rift System, Ross Sea, Antarctica, Global and Planetary Change, 23 1999.79–103. Cande, S.C. and J.M. Stock (2004) Pacific–Antarctic–Australia motion and the formation of the Maquarie Plate. Geophys. J. Int., 157, 399–414. Cande, S.C., J.M. Stock, R.D. Muller and T. Ishihara, (2000) Cenozoic motion between East and West Antarctica, Nature, 404, 145–150. Cooper, A.K., H. Trey, G. Cochrane, F. Egloff, M. Busetti and Acrup Working Group (1997), Crustal structure of the Southern Central Trough, Western Ross Sea. In: Ricci, C.A. 14 Ed., The Antarctic Region: Geological Evolution and Processes. Proceedings of the VIIth International Symposium on Antarctic Earth Sciences, Siena 1995. Terra Antarctica Publications, pp. 637–642. Courtillot, V., A. Davaille, J. Besse, and J. Stock (2003) Three distinct types of hotspots in the Earth’s mantle, Earth and Planetary Science Letters, 205, p. 295–308. Danesi S. and A. Morelli (2001), Structure of the upper mantle under the Antarctic Plate from surface wave tomography, Geophys. Res. Lett., 28, 4395-4398. Danesi S. and A. Morelli (2004), Seismological imaging of the Antarctic continental lithosphere: a review, Gl. Planet. Ch., 42, 155-165. Davey, F. J., and L. De Santis (2005), A multi-phase rifting Model for the Victoria Land basin, Western Ross Sea, in Antarctica: Contributions to Global Earth Sciences, edited by D. K. Futterer et al., chap. 6.3, pp. 301–306, Springer, New York. Davey, F. J., and G. Brancolini (1995), The Late Mesozoic and Cenozoic structural setting of the Ross Sea region, in Geology and Seismic Stratigraphy of the Antarctic Margin, Antarct. Res. Ser., vol. 68, edited by A. K. Cooper, P. F. Barker, and G. Brancolini, pp. 167 – 182, AGU, Washington, D. C. Davey, F.J., , S.C. Cande, J.M. Stock, (2006) Extension in thewestern Ross Sea region— links between Adare Basin and Victoria Land Basin, Geophys. Res. Lett., 33, L20315, doi:10.1029/2006GL027383. Finn, C. A., R. D. Muller, and K. S. Panter (2005), A Cenozoic diffuse alkaline magmatic province (DAMP) in the southwest Pacific without rift or plume origin, Geochem. Geophys. Geosyst., 6, Q02005, doi:10.1029/2004GC000723 Fitzgerald, P.G. (1992), The Transantarctic Mountains of Southern Victoria Land: the application of apatite fission track analysis to a the application of apatite fission track analysis to a rift shoulder, Tectonics, 11, 634–662. Fitzgerald, P.G., A.J.W. Gleadow (1988) Fission-track geochronology, tectonics and structure of the Transantarctic Mountains in northern Victoria Land, Antarctica, Chem. Geol., 73, 169–198. GANOVEX Team (1987), Geological map of NorthVictoria Land, Antarctica, 1:500000 explanation notes. Geol. Jahrb., B66, 7-79. Hager B. H. and R. J. O'Connell, A simple global model of plate dynamics and mantle convectionJ. Geophys. Res. 86, 4843-4867, 1981. Hamilton, R., C.C. Sorlien, P. Luyendyk, , L.R. Bartek (2001) Cenozoic tectonics of the Cape Roberts rift basin and Transantarctic Mountains front, southwestern Ross Sea, Antarctica, Tectonics, 20, 325–342. Jordan, H. (1981), Tectonic observations in the Hallet Volcanic Province, Antarctica. Geol. Jb., B 41, 111 - 125. King, S.D. (2007) Hotspot and edge-driven convection, Geology, 35, 223-226, doi: 477 10.1130/G23291A.1 Läufer A., G. Kleindshmidt, F. Hejnes-Kunst, F. Rossetti, C. Faccenna (2006) Geological Map of the Cape Adare Quadrangle, north Victoria Land, Antarctica (Scale 1:250.000), BGR, Hannover, Germany. Lawrence J.F., D.A. Wiens, A.A. Nyblade, S. Anandakrishnan, P.J. Shore and D. Voigt (2006), Crust and upper mantle structure of the Transantarctic Mountains and surrounding regions from receiver functions, surface waves and gravity: Implication and uplift models, Geoch. Geophys. Geosys., 7, 10, Q10011, doi:10.1029/2006GC001282. Lawver L.A. and L.M. Gahagan (1994) Constraints on timing of extension in the Ross Sea region, Terra Antarctica, 1, 545-552. LeMasurier, W. E. (1990), Late Cenozoic volcanism on the Antarctic Plate: An overview, in Volcanoes of the Antarctic Plate and Southern Oceans, Antarct. Res. Ser., vol. 48, edited by W. E. LeMasurier and J. W. Thomson, pp. 1–18,AGU, Washington, D. C. Lisker F., A. L., A.L .Läufer, W M. Olesch, F. Rossetti and T. Schäfer (2006), Transantarctic Basin: new insights from fission trackand structural data from the USARPMountains and adjacent areas (NorthernVictoria Land,Antarctica), Basin Research, 18, 497-520. Lisker, F. 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Geodynamics manuscript 2007 ftingv https://doi.org/10.1130/0091 2022-07-29T06:04:34Z Northern Victoria Land is located at the boundary between an extended, presumably hot, region (West Antarctic Rift System, WARS) and the thick, possibly cold East Antarctic craton. The style and timing of Tertiary deformation along with relationships with the magmatic activity are still unclear, and contrasting models have been proposed. We performed structural and morphotectonic analyses at the NE termination of northern Victoria Land in the Admiralty Mountains area, where the relationship between topography, tectonics and magmatism is expected to be well pronounced. We found evidence of two subsequent episodes of faulting, occurring concurrently with the Neogene Mc Murdo volcanism. The first episode is associated with dextral transtension and it is overprinted by extensional tectonics during the emplacement of large shield alkaline volcanoes. Upper mantle seismic tomography shows that the extensional regime is limited to regions overlying a low velocity anomaly. We interpret this anomaly to be of thermal origin, and have tested the role of large-scale upwelling on lithosphere deformation in the area. The results of this integrated analysis suggest that the morphotectonic setting of the region and the magmatism are likely the result of upwelling flow at the boundary between the cold cratonic and the hot stretched province (WARS), at work until recent time in this portion of the northern Victoria Land. Programma Nazionale di Ricerca in Antartide (PNRA) Submitted 3.3. Geodinamica e struttura dell'interno della Terra JCR Journal open Manuscript Antarc* Antarctic Antarctica Antartide East Antarctica Ross Sea Victoria Land Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia) Admiralty Mountains ENVELOPE(168.762,168.762,-71.788,-71.788) Antarctic East Antarctica Ross Sea Victoria Land |