Compositional characteristics of garnets and pyroxenes in contact-metasomatic skarn deposits and their relationship with metallization

Zhao Bin, M. D. Barton

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

The compositions of more than 300 granets and pyroxenes from 14 contact-metasomatic calcic skarn deposits and calcic-magnesia skarn skarn deposits in China have been examined using electron microprobe technique. The compositions of garnets and pyroxenes from a wide variety of ore types represent ten major classes of calcic skarn deposits (Fe, Fe-Cu, Pb-Zn,W, Sn, Sn-Mo-Bi-W, W-Bi-Cu-Mo, Cu-Zn and W-Zn-Cu) and three major classes of calcic-magnesia skarn deposits (Fe-Cu, Mo, Pb-Zn). Garnets and pyroxenes show a wide range of variation in composition, but the majority of garnets are grossular-andradite solid solutions containing less than 15 mol% (spessartine + almandine + pyrope), whereas most pyroxenes are diopside-hedenbergite solid solutions containing less than 5 mol% johannesenile. Some pyroxenes from a Pb-Zn calcic-magnesia skarn deposit display an increase in Mn content. Only Sn-W calcic skarn deposits and Pb-Zn calcic-magnesia skarn deposits contain garnets with more than 15 mol% (spessartine + almandine + pyrope). Some relationships have been established between the compositions of garnets and pyroxenes and the metallization types of economically important metals in skarn deposits.

Original languageEnglish (US)
Pages (from-to)329-335
Number of pages7
JournalChinese Journal of Geochemistry
Volume7
Issue number4
DOIs
StatePublished - Sep 1 1988
Externally publishedYes

ASJC Scopus subject areas

  • Geochemistry and Petrology

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