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Origin and significance of tourmaline-rich rocks in the Broken Hill district, Australia

Economic Geology
By: , and 

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Abstract

Tourmaline-rich rocks are widespread minor lithologies within the Early Proterozoic Willyama supergroup. Most of the tourmaline-rich rocks are within the Broken Hill Group that hosts the main Pb-Zn-Ag ores. Electron microprobe analyses of tourmalines intergrown with Fe sulfides at the Globe mine show Mg-rich compositions relative to tourmalines in sulfide-free assemblages from the same area, suggesting early (premetamorphic) introduction of boron and Mg enrichment of tourmaline by sulfide-silicate reactions during metamorphism. Combined field and geochemical data indicate that the district tourmalinites represent normal clastic sediments that were metasomatically altered by boron-rich hydrothermal fluids at or below the sediment-water interface. The geochemical data imply relative immobility of Al, Ti, Cr, and heavy REE during hydrothermal alteration and later metamorphism. -from Authors

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Origin and significance of tourmaline-rich rocks in the Broken Hill district, Australia
Series title Economic Geology
Volume 88
Issue 3
Year Published 1993
Language English
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Economic Geology
First page 505
Last page 541