skip to main content
Idioma:
Primo Search
Clear Search Box
Search in: Busca Geral
Busca Avançada
Busca por Índices

Mantle compensation of active metamorphic core complexes at Woodlark rift in Papua New Guinea

Abers, Geoffrey A ; Ferris, Aaron ; Craig, Mitchell ; Davies, Hugh ; Lerner-Lam, Arthur L ; Mutter, John C ; Taylor, Brian

Nature (London), 2002-08, Vol.418 (6900), p.862-865 [Periódico revisado por pares]

London: Nature Publishing

Texto completo disponível

Citações Citado por
  • Título:
    Mantle compensation of active metamorphic core complexes at Woodlark rift in Papua New Guinea
  • Autor: Abers, Geoffrey A ; Ferris, Aaron ; Craig, Mitchell ; Davies, Hugh ; Lerner-Lam, Arthur L ; Mutter, John C ; Taylor, Brian
  • Assuntos: Crystalline rocks ; Earth sciences ; Earth, ocean, space ; Exact sciences and technology ; Igneous and metamorphic rocks petrology, volcanic processes, magmas ; Plate tectonics
  • É parte de: Nature (London), 2002-08, Vol.418 (6900), p.862-865
  • Notas: ObjectType-Article-2
    SourceType-Scholarly Journals-1
    ObjectType-Feature-1
    content type line 23
    ObjectType-Article-1
    ObjectType-Feature-2
  • Descrição: In many highly extended rifts on the Earth, tectonic removal of the upper crust exhumes mid-crustal rocks, producing metamorphic core complexes. These structures allow the upper continental crust to accommodate tens of kilometres of extension, but it is not clear how the lower crust and underlying mantle respond. Also, despite removal of the upper crust, such core complexes remain both topographically high and in isostatic equilibrium. Because many core complexes in the western United States are underlain by a flat Moho discontinuity, it has been widely assumed that their elevation is supported by flow in the lower crust or by magmatic underplating. These processes should decouple upper-crust extension from that in the mantle. In contrast, here we present seismic observations of metamorphic core complexes of the western Woodlark rift that show the overall crust to be thinned beneath regions of greatest surface extension. These core complexes are actively being exhumed at a rate of 5-10 km Myr-1, and the thinning of the underlying crust appears to be compensated by mantle rocks of anomalously low density, as indicated by low seismic velocities. We conclude that, at least in this case, the development of metamorphic core complexes and the accommodation of high extension is not purely a crustal phenomenon, but must involve mantle extension.
  • Editor: London: Nature Publishing
  • Idioma: Inglês
Links
Voltar para lista de resultados
Ir para página anteriorAnterior Resultado  4 AvançarIr para próxima página

  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

Buscando em bases de dados remotas. Favor aguardar.