Iron and oxygen isotope signatures of the pea ridge and pilot knob magnetite-apatite deposits, Southeast Missouri, USA

Tristan M. Childress, Adam C. Simon, Warren C. Day, Craig C. Lundstrom, Ilya N. Bindeman

Research output: Contribution to journalArticle

Abstract

New O and Fe stable isotope ratios are reported for magnetite samples from high-grade massive magnetite of the Mesoproterozoic Pea Ridge and Pilot Knob magnetite-apatite ore deposits and these results are compared with data for other iron oxide-apatite deposits to shed light on the origin of the southeast Missouri deposits. The d18O values of magnetite from Pea Ridge (n = 12) and Pilot Knob (n = 3) range from 1.0 to 7.0 and 3.3 to 6.7%, respectively. The d56Fe values of magnetite from Pea Ridge (n = 10) and Pilot Knob (n = 6) are 0.03 to 0.35 and 0.06 to 0.27%, respectively. These d18O and the d56Fe values suggest that magnetite crystallized from a silicate melt (typical igneous δ56Fe ranges 0.06-0.49%) and grew in equilibrium with a magmatic-hydrothermal aqueous fluid. We propose that the δ18O and δ56Fe data for the Pea Ridge and Pilot Knob magnetite-apatite deposits are consistent with the flotation model recently proposed by Knipping et al. (2015a), which invokes flotation of a magmatic magnetite-fluid suspension and offers a plausible explanation for the igneous (i.e., up to 15.9 wt % TiO2 in magnetite) and hydrothermal features of the deposits.

Original languageEnglish (US)
Pages (from-to)2033-2044
Number of pages12
JournalEconomic Geology
Volume111
Issue number8
DOIs
StatePublished - Dec 2016

ASJC Scopus subject areas

  • Geophysics
  • Geology
  • Geochemistry and Petrology
  • Economic Geology

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