Fluids in Deep Continental Crust

  1. Muawia Barazangi and
  2. Larry Brown
  1. W. S. Fyfe

Published Online: 15 MAR 2013

DOI: 10.1029/GD014p0033

Reflection Seismology: The Continental Crust

Reflection Seismology: The Continental Crust

How to Cite

Fyfe, W. S. (1986) Fluids in Deep Continental Crust, in Reflection Seismology: The Continental Crust (eds M. Barazangi and L. Brown), American Geophysical Union, Washington, D. C.. doi: 10.1029/GD014p0033

Author Information

  1. Geology Department, University of Western Ontario, London, Canada, N6A 5B7

Publication History

  1. Published Online: 15 MAR 2013
  2. Published Print: 1 JAN 1986

Book Series:

  1. Geodynamics Series

ISBN Information

Print ISBN: 9780875905143

Online ISBN: 9781118670118

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Keywords:

  • Earth—Crust—Congresses;
  • Continents—Congresses;
  • Seismic reflection method—Congresses

Summary

The production of high grade metamorphic rocks of the amphibolite-granulite facies in continental crust requires an increase in temperature associated with magma underplating or tectonic thickening. Underplating of continental crust by dense mantle magmas may lead to assimilation of wet, heavy crustal components and their degassing (H2O-CO2-S). Deep subduction of ocean crust spilites, serpentinites and sediments rich in H2O-CO2-S, may also cause fluid release into the basal crust. Major continental collisions and minor overthrust events associated with transform faults can lead to massive degassing. The fluid mobilization in the Himalayan event may involve a fluid mass similar to the ice caps. In addition, such a large scale event may cause mobilization of significant quantities of CO2 and salt depending on the lithology of the thickened crust. Whenever large volumes of fluids move there is ore potential. In general, the environmental consequences of such tectonic events are little understood.