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Geochemical Journal
Geochemical Journal An open access journal for geochemistry
Published for geochemistry community from Geochemical Society of Japan.

A metamorphogenic alteration zone around the stratiform Broken Hill ore deposits, Australia

I. R. Plimer
Geochemical Journal, Vol. 9, No. 4, P. 211-220, 1975


A symmetrical metamorphic alteration zone around the Broken Hill orebodies derives from retrogressive metamorphism. This zone is at least 300m wide and is characterized by a great increase in Rb/Sr and the replacement of earlier high grade metamorphic minerals by sericite. The alteration observed probably results from fluid ascent along permeable sulphide-silicate competency boundaries at the waning stages of granulite facies metamorphism.

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