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Petrology And Geochemistry Of Late-Stage Intrusions Of The A-Type, Mid-Proterozoic Pikes Peak Batholith (Central Colorado, Usa): Implications For Petrogenetic Models, Diane R. Smith, J. Noblett, R. A. Wobus, D. Unruh, J Douglass, R. Beane, C. Davis, S. Goldman, G. Kay, B. Gustavson, B. Saltoun, J. Stewart
Petrology And Geochemistry Of Late-Stage Intrusions Of The A-Type, Mid-Proterozoic Pikes Peak Batholith (Central Colorado, Usa): Implications For Petrogenetic Models, Diane R. Smith, J. Noblett, R. A. Wobus, D. Unruh, J Douglass, R. Beane, C. Davis, S. Goldman, G. Kay, B. Gustavson, B. Saltoun, J. Stewart
Geosciences Faculty Research
The ~1.08 Ga anorogenic, A-type Pikes Peak batholith (Front Range, central Colorado) is dominated by coarse-grained, biotite ± amphibole syenogranites and minor monzogranites, collectively referred to as Pikes Peak granite (PPG). The batholith is also host to numerous small, late-stage plutons that have been subdivided into two groups (e.g. Wobus, 1976. Studies in Colorado Field Geology, Colorado School of Mines Professional Contributions, Colorado): (1) a sodic series (SiO2 = ~44–78 wt%; K/Na = 0.32–1.36) composed of gabbro, diabase, syenite/quartz syenite and fayalite and sodic amphibole granite; and (2) a potassic series (SiO2 = ~70–77 wt%; K/Na = 0.95–2.05), …