The nature and significance of sulphate-rich, aluminous efflorescences from the Te Kopia geothermal field, Taupo volcanic zone, New Zealand

Alunogen and meta-alunogen are the dominant phases present in transient sulphate efflorescences that are the latest products of the alteration of ignimbrite country rocks in the long-lived Te Kopia geothermal field. Meta-alunogen pseudomorphs alunogen and both species occur as white, fibrous, tangle...

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Veröffentlicht in:	Mineralogical magazine 1999-06, Vol.63 (3), p.413-419
Hauptverfasser:	Martin, R, Rodgers, K. A, Browne, P. R. L
Format:	Artikel
Sprache:	eng
Schlagworte:	alteration aluminium alunogen Australasia clay minerals crystallization efflorescence fluorescence geothermal halotrichite hydrothermal alteration igneous rocks ignimbrite kaolinite metasomatism Mineralogy New Zealand pyroclastics sheet silicates silicates sulfates Taupo volcanic zone Te Kopia geothermal field volcanic rocks
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Beschreibung
Zusammenfassung:	Alunogen and meta-alunogen are the dominant phases present in transient sulphate efflorescences that are the latest products of the alteration of ignimbrite country rocks in the long-lived Te Kopia geothermal field. Meta-alunogen pseudomorphs alunogen and both species occur as white, fibrous, tangled masses, as prismatic, parallel growths, and as thin, platy, crystals, 8-15 µm across, that coalesce in an open cellular network. Small (
ISSN:	0026-461X 1471-8022
DOI:	10.1180/002646199548501