Deep-seated fluid involvement in ductile-brittle deformation and mineralization, South Mountains metamorphic core complex, Arizona

B. M. Smith, S. J. Reynolds, H. W. Day, R. J. Bodnar

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In the South Mountains metamorphic core complex of central Arizona, a middle Tertiary pluton exhibits the entire spectrum of ductile-to-brittle structures characteristic of metamorphic core complexes. Apart from minor Cu-enrichments in brecciated samples, original major- and minor-element abundances of the deformed igneous rocks are remarkably undisturbed, and there is little correspondence between chemical composition and deformational state. Fluids present during the entire history of ductile-to-brittle deformation were apparently close to chemical and oxygen-hydrogen-isotope equilibrium with the rocks. The temporal association of deformation with Tertiary plutonism and the evidence for high-temperature fluid/rock near-equilibrium support the interpretation that the fluids were expelled from differentiated, late crystallizing portions of the South Mountains plutonic complex. -from Authors

Original languageEnglish (US)
Pages (from-to)559-569
Number of pages11
JournalGeological Society of America Bulletin
Issue number4
StatePublished - Jan 1 1991
Externally publishedYes


ASJC Scopus subject areas

  • Geology

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