Tuesday, February 24, 2015

Superseals

Superseals are those rocks that have a high ductility (ability to deform without fracturing) under pressure (great depths), and for long time periods. Examples of superseals in order of quality are

  1. Salt (halite). This is the only true superseal.
  2. Anhydrite -containing 30% or more gypsum (water)
  3. Kerogen-rich shales (plastic shales). Usually deep water pelagics.
  4. High pressure shales. May be effective at great depths. 

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