Some aspects of the geology and mineralogy of the fluorine-rich skarn at McCullough Butte, Eureka County, Nevada.

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

A stockwork of veins and their alteration envelopes in Palaeozoic miogeosynclinal sedimentary rocks is exposed on two sides of some Cretaceous two-mica granite porphyry intrusions. The mineralization contains appreciable F, Zn and Be, and minor Mo, W and Sn. From the intrusions, the distal limit of garnet veins comes first, followed sequentially by those of plagioclase, muscovite and quartz veins. Early garnets and pyroxenes are Fe-poor; later garnets are Fe- and Mn-enriched. The skarn is attributed to F-rich fluids from the intrusions reacting with the carbonate host-rock under moderate T, and low P, fO2, fS2 and fCO2 conditions. Total Fe, Cu and Pb contents are low, but acid, F-bearing species and LIL elements are significant.-K.F.

Original languageEnglish (US)
Pages (from-to)324-328
Number of pages5
JournalCarnegie Institution of Washington Year Book
Volume81
StatePublished - Jan 1 1982
Externally publishedYes

ASJC Scopus subject areas

  • Environmental Science(all)
  • Earth and Planetary Sciences(all)

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