Advertisement

Lamprophyres pp 113-124 | Cite as

Plutonic and Volcanic Equivalents of Lamprophyres

  • N. M. S. Rock

Abstract

As already shown (Section 3.1), lamprophyres are overwhelmingly hypabyssal, medium-grained intrusions. Although LL commonly exist as volcanic rocks, and AL and CAL do so rarely, KIL and UML almost never do (Section 3.1.7). Again, although relatively coarsegrained (e.g. pegmatoidal) segregations do exist in some dykes (e.g. Macdonald et al. 1986), no example of a true lamprophyre ‘pluton’ has ever been identified. Because most writers can see no intrinsic reason for this (R.H.Mitchell 1986, p.43 found the absence of ‘plutonic kimberlite’ particularly strange), this raises the question of whether other named plutonic or volcanic rock-types might be equivalent to lamprophyres. The old suggestion that LL are simply volcanic lamprophyres (Section 1.3.1) can be dismissed — they are merely one type of lamprophyre — but other suggestions deserve more careful attention.

Keywords

Gabbroic Rock Amphibole Composition Hornblende Gabbro Ultramafic Lamprophyre Shoshonitic Rock 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Copyright information

© Springer Science+Business Media New York  1991

Authors and Affiliations

  • N. M. S. Rock
    • 1
  1. 1.Key Centre for Strategic Mineral Deposits Department of GeologyUniversity of Western AustraliaAustralia

Personalised recommendations