Composition changes in an ash-flow cooling unit during K metasomatism, west-central Arizona

K. Hollocher, J. Spencer, J. Ruiz

Research output: Contribution to journalArticle

18 Scopus citations

Abstract

A variably altered rhyolitic ash-flow cooling unit in west-central Arizona was sampled and analyzed to gain a better understanding of compositional changes that took place during Tertiary K metasomatism. Mn, Cu, Zn, and other metals of economic importance were removed from the K-metasomatized rocks during alteration, making them a likely source for these metals in vein and stratiform Mn deposits and base metal ores related to detachment faults in western Arizona. Calculations indicate that the loss of Mn, Cu, Zn, and other metals from K-metasomatized volcanics is easily large enough to account for middle Tertiary Mn and detachment-related Cu and Zn ore deposits in west-central Arizona. -from Authors

Original languageEnglish (US)
Pages (from-to)877-888
Number of pages12
JournalEconomic Geology
Volume89
Issue number4
StatePublished - Dec 1 1994
Externally publishedYes

ASJC Scopus subject areas

  • Geophysics
  • Geology
  • Geochemistry and Petrology
  • Economic Geology

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