Thinning of continental backarc lithosphere by flow-induced gravitational instability
作者: Claire A. CurrieRitske S. HuismansChristopher Beaumont
作者单位: 1Department of Oceanography, Dalhousie University, Halifax, NS, Canada B3H 4J1
2Department of Physics, University of Alberta, Edmonton, AB, Canada T6G 2G7
3Department of Earth Science, Bergen University,Allegaten 41, N-5007, Bergen, Norway
刊名: Earth and Planetary Science Letters, 2008, Vol.269 (3), pp.436-447
来源数据库: Elsevier Journal
DOI: 10.1016/j.epsl.2008.02.037
关键词: subduction zonemantle lithospheregravitational instabilitythermal–mechanical modelCascadia subduction zoneCanadian Cordillera
原始语种摘要: Abstract(#br)Many continental backarcs have thin (∼60 km) lithosphere for 100s of km behind the volcanic arc, even where there has been no significant extension. One mechanism to produce thin backarc lithosphere is through gravitational thinning of normal thickness lithosphere by subduction-related mantle flow. The stability of backarc mantle lithosphere is examined using thermal–mechanical models of subduction of an oceanic plate beneath continental lithosphere with an initial thickness of 120 km and a thermal structure similar to average Phanerozoic continental lithosphere. Subduction-induced mantle flow shears the base of the backarc lithosphere, producing lateral density perturbations. Owing to the non-Newtonian lithosphere rheology, shearing also reduces the...
全文获取路径: Elsevier  (合作)
影响因子:4.349 (2012)

  • lithosphere 岩石圈
  • instability 不稳定性
  • gravitational 重力
  • subduction 俯冲
  • composition 构图
  • thinning 狭缩
  • continental 大陆的
  • craton 稳定地块
  • mantle 地幔
  • density 密度