- Open Access
Mantle wedge deformation by subducting and rotating slab and its possible implication
Earth, Planets and Space volume 58, pages1087–1092(2006)
We have constructed a simple model of the deformation of the mantle wedge caused by the subducting and rotating slab based on corner flow model. By applying this model to the geological settings of the Somuncura plateau volcanic region, northern Patagonia, which is located far from the volcanic front, we constrain the mechanical aspect of the hypothesis that the volcanisms of the Somuncura region are triggered by the dehydration-induced melting of the up-warped transition zone which may contain more water than other regions do. Assuming that the water concentrates in the transition zone under the Somuncura plateau, we find that the above scenario may be possible, if the speed of the subducting slab is less than ∼2 cm/yr or the dip angle changes significantly (∼50 degrees within ∼8 Myr).
Batchelor, G. K., An Introduction to Fluid Dynamics, Cambridge Univ. Press, England, 655 pp., 1967.
Bercovici, D. and S. Karato, Whole-mantle convection and the transition-zone water filter, Nature, 425, 39–44, 2003.
Bohm, M., S. Luth, H. Echtler, G. Asch, K. Bataille, C. Bruhn, A. Rietbrock, and P. Wigger, The Southern Andes between 36° and 40°S latitude: seismicity and average seismic velocities, Tectonophys., 356, 275–289, 2002.
Cande, S. C. and R. B. Leslie, Late Cenozoic tectonics of the Southern Chile trench, J. Geophys. Res., 91, 471–496, 1986.
de Ignacio, C., I. Lopez, R. Oyarzun, and A. Marquez, The northern Patagonia Somuncura plateau basalts: a product of slab-induced, shallow asthenospheric upwelling?, Terra Nova, 13, 117–121, 2001.
Furukawa, Y., Magmatic processes under arcs and formation of the volcanic front, J. Geophys. Res., 98, 8309–8319, 1993.
Inoue, T., Effect of water on melting phase relations and melt composition in the system Mg2SiO4-MgSiO3-H2O up to 15 GPa, Phys. Earth Planet. Inter., 85, 237–263, 1994.
Iwamori, H., Degree of melting and source composition of Cenozoic basalts in southwest Japan: evidence for mantle upwelling by flux melting, J. Geophys. Res., 97, 10983–10995, 1992.
Kay, S. M., A. Ardolino, M. Franchi, and V. A. Ramos, El origen de la meseta de Somuncura: Distribucion y geoquimica de sus rocas volcanicas maficas, Proceedings 12th Congreso Geologico Argentino, 4, 236–248, 1993.
Komabayashi, T. Omori, S. and S. Maruyama, Petrogenetic grid in the system MgO-SiO2-H2O up to 30 GPa, 1600°C: Applications to hydrous peridotite subducting into the Earth’s deep interior, J. Geophys. Res., 109, B03206, doi:10.1029/2003JB002651, 2004.
Matsukage, K., J. Zhicheng, and S. Karato, Density of hydrous silicate melt at the conditions of Earth’s deep mantle, Nature, 438, 488–491, 2005.
McKenzie, D. P., Speculations on the consequences and causes of plate motions, Geophys. J. R. Astr. Soc., 18, 1–32, 1968.
Miyashiro, A., Hot regions and the origin of marginal basins in the western Pacific, Tectonophys., 122, 195–216, 1986.
Morgan, W. J., Convection plumes in the lower mantle, Nature, 230, 42–43, 1971.
Muñoz, J., R. Troncoso, P. Duhart, P. Crignola, L. Farmer, and C. R. Stern, The relation of the mid-Tertiary coastal magmatic belt in south-central Chile to the late Oligocene increase in plate convergence rate, Revista Geologica de Chile, 27, 177–204, 2000.
Ohtani, E. and M. Maeda, Density of basaltic melt at high pressure and stability of melt at the base of the lower mantle, Earth. Planet. Sci. Lett., 193, 69–75, 2001.
Orihashi, Y., A. Motoki, M. J. Haller, H. Sumino, H. Iwamori, F. D. Cario, D. Hirata, R. Anma, and K. Nagao, New geochronological and geochemical constrains for extra back-arc volcanism in Somuncura region, northern Patagonia, Abstracts IAVCEI, General Assembly 2004, S07C, 12, 2004.
Orihashi, Y., A. Motoki, M. J. Haller, and CHRISTMASSY Project Volcanic Group, Petrogenesis of relatively large-volume basalts on extraback arc province: Somuncura plateau, north Patagonia, Earth Monthly, 27, 438–447, 2005 (in Japanese).
Rapela, C. W., L. A. Spalletti, J. C. Merodio, and E. Aragon, Temporal evolution and spatial variation of early Tertiary volcanism in the Patag-onian Andes, J. South American Earth Sciences, 1, 75–88, 1988.
Richard, G., M. Monnereau, and J. Ingrin, Is the transition zone an empty water reservoir? Inferences from numerical model of mantle dynamics, Earth Planet. Sci. Lett., 205, 37–51, 2002.
Sakamaki, T., A. Suzuki, and E. Ohtani, Stability of hydrous melt at the base of the Earth’s upper mantle, Nature, 439, 192–194, 2006.
Smyth, J. R. and T. Kawamoto, Wadsleyite II: A new high pressure hydrous phase in the peridotite-H2O system, Earth Planet. Sci. Lett., 146, E9–E16, 1997.
Stern, C. R., F. A. Frey, K. Futa, R. E. Zartman, Z. C. Peng, and T. K. Kyser, Tarce-element and Sr, Nd, Pb and O isotopic composition of Pliocene to Quaternary alkali basalts of the Patagonian plateau lavas of southernmost of South-America, Contrib. Mineral. Petrol., 104, 294–308, 1990.
Storey, B. C., The role of mantle plumes in continental breakup: case histories from Gondwanaland, Nature, 377, 301–308, 1995.
Tebbens, S. F. and S. C. Cande, Southeastern Pacific tectonic evolution from early Oligocene to present, J. Geophys. Res., 102, 12061–12084, 1997.
Zhao, D., L. Jianshe, and T. Rongyu, Origin of the Changbai intraplate volcanism in Northeast China: Evidence from seismic tomography, Chin. Sci. Bull., 13, 1401–1408, 2004.
About this article
Cite this article
Honda, S., Orihashi, Y., Mibe, K. et al. Mantle wedge deformation by subducting and rotating slab and its possible implication. Earth Planet Sp 58, 1087–1092 (2006) doi:10.1186/BF03352614
- Mantle wedge
- rotating slab
- transition zone