mechanisms of crustal subsidence l.
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Mechanisms of crustal subsidence. Sedimentary basins Isostasy Basins due to stretching Basins due to cooling Basins due to convergence Basins due to tearing of crust. Principles of isostasy. Hawaiin seamount chain with flexed lithospheric lows. Basins due to stretching.

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mechanisms of crustal subsidence
Mechanisms of crustal subsidence
  • Sedimentary basins
  • Isostasy
  • Basins due to stretching
  • Basins due to cooling
  • Basins due to convergence
  • Basins due to tearing of crust
slide9

Mantle plumes associated with rifting – not required, but do occur e.g. North Atlantic rifting and emplacement of Tertiary igneous province

slide18

Passive margin accumulates thick sediment that drapes the continent/ocean transition.

Subsidence is slow and exponentially declines as cooling of rifted lithosphere slows.

summary
Summary
  • Sedimentary Basin form by a number of means
  • Lithosphere can stretch (Rift basins)
  • Cool and subside (Passive margins)
  • Be loaded and bend (accretionary trench on oceans – Foreland basin on continents)
  • Tear apart to form pull-apart or strike-slip basins.
  • Isostasy is critical