Cappa reported in 1998 that alkalic igneous rocks in Colorado formed in a wide variety of tectonic settings-from the Cambrian intrusive complexes of the Wet Mountains to the late Tertiary alkalic basalts of central Colorado. They host mineral deposits as economically important as the Cripple Creek gold district, which has produced over 21 million ounces of gold since its discovery at or near the surface in 1891. The following chapters discuss the principal
alkalic igneous complexes that are associated with economically significant mineral deposits.
The final chapter describes several other alkalic igneous provinces of the state not associated with significant economic mineral deposits. Whole rock geochemical data and the CIPW normative compositions (Best, 1982) have been included as tables in the appendix and are summarized in figures at the end of each chapter.
References for each region are included at the end of the chapter.
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