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Contributions to Mineralogy and Petrology

, Volume 27, Issue 1, pp 11–24 | Cite as

Greenschist amphiboles from Haast river, New Zealand

  • A. F. Cooper
  • J. F. Lovering
Article

Abstract

A section across the Haast Schist Group in the Southern Alps of New Zealand shows a sequence of metamorphosed eugeosynclinal sediments. Meta-basic rocks (greenschists) have been studied to determine the nature of the actinolite-hornblende transition and to investigate the change in amphibole composition through the Metamorphic Facies Series.

Electron microprobe analyses of 21 representative amphiboles, including 3 amphibole pairs can be shown to support theories of a miscibility break in the calciferous amphibole solid solution series. The existence of a miscibility break is further supported by the widespread appearance, even at low metamorphic grades, of exsolution lamellae in actinolite and hornblende amphiboles.

Amphibolite facies amphiboles differ from greenschist facies amphiboles in that (a) there are increased amounts of Ti entering the lattice and (b) that there is an increased occupancy of the A site at higher metamorphic grades.

Keywords

Electron Microprobe Microprobe Analysis Solution Series Miscibility Break Electron Microprobe Analysis 
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.

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Copyright information

© Springer-Verlag 1970

Authors and Affiliations

  • A. F. Cooper
    • 1
  • J. F. Lovering
    • 2
  1. 1.Geology DepartmentOtago UniversityDunedinNew Zealand
  2. 2.Department of Geophysics and GeochemistryAustralian National UniversityCanberra

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