Volatile fluid overpressure in layered intrusions and the formation of potholes

Journal Article

By analogy with pockmark formation theory, it is suggested that the cumulate section below the pothole region develops significant overpressures as solidifying intercumulus liquid separates a volatile-rich fluid phase. The increase in pore pressure expresses itself as a dome-shaped swelling on the chamber flow and in the uppermost part of the crystal pile, which eventually fractures and results in the violent escape of fluid. The combination of fluidization of the cumulates and incongruent melting, caused by the depression of liquidus temperature as a result of volatile elements added to less evolved liquid and crystal assemblages, leads to the formation of the pothole. -from Author

Duke Authors

Cited Authors

  • Boudreau, AE

Published Date

  • 1992

Published In

  • Australian Journal of Earth Sciences

Volume / Issue

  • 39 / 3

Start / End Page

  • 277 - 287