Volcanism and Igneous Underplating in Sedimentary Basins and at Rifted Continental Margins

  1. Raymond A. Price
  1. Robert S. White

Published Online: 18 MAR 2013

DOI: 10.1029/GM048p0125

Origin and Evolution of Sedimentary Basins and Their Energy and Mineral Resources

Origin and Evolution of Sedimentary Basins and Their Energy and Mineral Resources

How to Cite

White, R. S. (1989) Volcanism and Igneous Underplating in Sedimentary Basins and at Rifted Continental Margins, in Origin and Evolution of Sedimentary Basins and Their Energy and Mineral Resources (ed R. A. Price), American Geophysical Union, Washington, D. C.. doi: 10.1029/GM048p0125

Author Information

  1. Bullard Laboratories, Madingley Road, Cambridge CB3 0EZ, England

Publication History

  1. Published Online: 18 MAR 2013
  2. Published Print: 1 JAN 1989

ISBN Information

Print ISBN: 9780875904528

Online ISBN: 9781118666654

SEARCH

Keywords:

  • Sedimentary basins—Congresses;
  • Mines and mineral resources—Congresses;
  • Power resources—Congresses

Summary

When continental lithosphere is thinned by stretching, the nnderlying asthenosphere wells up to fill the space. As the asthenosphere wells up it decompresses and generates partial melt. The amount of melt that is produced is critically dependent on the temperature: the hotter the asthenosphere the more melt is generated. The partial melt is buoyant, and rises quickly upwards to be added to the overlying crust. Relatively small variations in the asthenosphere temperature of the order of 100°C cause major differences in both the volume of igneous rocks generated and in the subsidence history of the stretched region. A simple model of association of a stretched region with thermal anomalies caused by plumes (‘hot-spots') in the underlying mantle can explain the occurrence or absence of volcanically active sedimentary basins and rifted continental margins. This simple model works remarkably well globally.