Original paper

Electric charge carriers in crustal rocks and what they may tell us about the Solid Earth

Freund, Friedemann

Global Tectonics and Metallogeny Volume 8 Number 1-4 (2003), p. 163 - 163

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published: Jan 1, 2003

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There is strong evidence that igneous and high-grade metamorphic rocks contain relatively highly densities (- 10 20 per cubic centimeter) of dormant electronic charge carriers in form of positive hole pairs (PHP). A positive hole is a defect electron residing in the O 2p-dominated valence band of (otherwise insulating) silicate minerals. Therefore, a positive hole is an O- in a matrix of O2-. In the language of chemistry a PHP is a peroxy bond, -OO-, probably linking two adjacent SiO4 tetrahedra.


crustal rocksmetamorphic rockssilicate minerals