Open-file Report - 568
Geochemical, mineralogical, textural and map data for crystal-rich, caldera-facies Hells Mesa Tuff and a comagmatic lava dome, central New Mexico: with a note on compositional zoning (Supersedes NMBGMR Open-file Report 458)

This report presents phenocrystic mineral modes, textural data, geochemical data and detailed geologic maps of caldera-facies Hells Mesa Tuff and a slightly younger comagmatic lava dome with dome-derived tuff breccias that are exposed in the eastern and southwestern sectors of the Socorro caldera (Fig1). This data was initially presented in support of an article entitled Waning-stage Eruptions of the Oligocene Socorro Caldera, Central New Mexico, which was published by the New Mexico Natural History Museum in their Bulletin 18, Volcanology in New Mexico (Chamberlin, 2001b). These data sets supplement a detailed report on the geology, hydrothermal alteration and mineralization within the Luis Lopez quadrangle (Chamberlin and Eggleston 1996), a revised geologic map of the Luis Lopez quadrangle (Chamberlin, Eggleston and McIntosh, 2002) and a ⁴⁰Ar/³⁹Ar geochronology study of the eastern sector of the Socorro caldera, source of the Hells Mesa Tuff (Chamberlin, McIntosh and Eggleston, 2004). This report supersedes NMBG&MR Open-file Report 458 (Chamberlin, 2001a); it includes several previously unpublished data tables and derivative data plots.

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