Structural evolution of an A-type subduction zone, Lofoten- Rombak area, northern Scandinavian Caledonides.

Kip Hodges, J. M. Bartley, B. C. Burchfiel

Research output: Contribution to journalArticle

49 Citations (Scopus)

Abstract

The climactic phase of the Caledonian orogeny in Scandinavia involved collision of the Baltic and Greenland cratons in late Ordovician(?) to Silurian time. We infer that the collision resulted in large-scale subduction of the leading edge of the Baltic craton beneath an 'Andean-type' Greenland continental margin. Deep erosional levels in the Lofoten-Rombak area, Norway-Sweden (approx 69oN) permit direct examination and evaluation of the structural evolution of a continental or A-type subduction zone. The early stages of collision involved en bloc underthrusting of the continental margin to depths of at least 30km. During this process, deformational effects in the lower plate were restricted to its upper few hundred meters. Ultimately, en bloc A-type subduction should be limited by buoyancy effects. As convergence continued, the lower plate became involved in a series of imbricate thrusts with the same vergence as the initial subduction zone. The temporal and spatial relationships between these basement-involved thrusts are similar to those observed in foreland fold and thrust terrains. Field and geophysical data bearing on lower plate behavior elsewhere in the Caledonides and in other collisional orogens suggest that the structural features observed in the Lofoten-Rombak area may be generally characterstic of A-type subduction in continent- continent collisional settings.-Authors

Original languageEnglish (US)
Pages (from-to)441-462
Number of pages22
JournalTectonics
Volume1
Issue number5
StatePublished - 1982
Externally publishedYes

Fingerprint

Bearings (structural)
Buoyancy
subduction zone
subduction
thrust
collision
craton
continental margin
cratons
Greenland
continental shelves
continents
collisions
Caledonian orogeny
Silurian
buoyancy
Ordovician
Scandinavia
Norway
Sweden

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

Cite this

Structural evolution of an A-type subduction zone, Lofoten- Rombak area, northern Scandinavian Caledonides. / Hodges, Kip; Bartley, J. M.; Burchfiel, B. C.

In: Tectonics, Vol. 1, No. 5, 1982, p. 441-462.

Research output: Contribution to journalArticle

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