Hydration of cordierite and hypersthene and a description of the retrograde orthoamphibole isograd in the Limpopo belt, South Africa.

D. D. Van Reenen

Hydration of cordierite and hypersthene and a description of the retrograde orthoamphibole isograd in the Limpopo belt, South Africa.

D. D. Van Reenen

Geology

Research output: Contribution to journal › Article › peer-review

88 Citations (Scopus)

Abstract

The retrograde orthoamphibole isograd in the southern marginal zone of the Limpopo belt is expressed in Mg-rich pelitic gneisses by two hydration reactions that are superimposed on earlier corona textures of cordierite and hypersthene after garnet: hypersthene + quartz + H₂O = anthophyllite, and cordierite + H₂O = gedrite + kyanite + quartz. The T of hydration at the isograd is estimated at <625-650oC with a minimum P of 6 kbar.-J.A.Z.

Original language	English
Pages (from-to)	900-915
Number of pages	16
Journal	American Mineralogist
Volume	71
Issue number	7-8
Publication status	Published - 1986

ASJC Scopus subject areas

Geophysics
Geochemistry and Petrology

Cite this

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abstract = "The retrograde orthoamphibole isograd in the southern marginal zone of the Limpopo belt is expressed in Mg-rich pelitic gneisses by two hydration reactions that are superimposed on earlier corona textures of cordierite and hypersthene after garnet: hypersthene + quartz + H2O = anthophyllite, and cordierite + H2O = gedrite + kyanite + quartz. The T of hydration at the isograd is estimated at <625-650oC with a minimum P of 6 kbar.-J.A.Z.",

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T1 - Hydration of cordierite and hypersthene and a description of the retrograde orthoamphibole isograd in the Limpopo belt, South Africa.

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PY - 1986

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N2 - The retrograde orthoamphibole isograd in the southern marginal zone of the Limpopo belt is expressed in Mg-rich pelitic gneisses by two hydration reactions that are superimposed on earlier corona textures of cordierite and hypersthene after garnet: hypersthene + quartz + H2O = anthophyllite, and cordierite + H2O = gedrite + kyanite + quartz. The T of hydration at the isograd is estimated at <625-650oC with a minimum P of 6 kbar.-J.A.Z.

AB - The retrograde orthoamphibole isograd in the southern marginal zone of the Limpopo belt is expressed in Mg-rich pelitic gneisses by two hydration reactions that are superimposed on earlier corona textures of cordierite and hypersthene after garnet: hypersthene + quartz + H2O = anthophyllite, and cordierite + H2O = gedrite + kyanite + quartz. The T of hydration at the isograd is estimated at <625-650oC with a minimum P of 6 kbar.-J.A.Z.

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AN - SCOPUS:0022879334

SN - 0003-004X

VL - 71

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ER -

Hydration of cordierite and hypersthene and a description of the retrograde orthoamphibole isograd in the Limpopo belt, South Africa.

Abstract

ASJC Scopus subject areas

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