 | | Report (issue) | | Hydrothermal Alteration Mineralogy in Newberry 2 Drill Core, Newberry Volcano, Oregon by Keith E. Bargar and Terry...iMenlo Park, CA INTRODUCTION Newberry Volcano, located in central Oregon about 40 km south of Bend, lies...western end of a volcanic terrain that extends across much of the southeastern part of Oregon, and becomes...the west (Macleod and others, 1976). The caldera of Newberry Volcano contains several hot-springs, fumaroles...1981; MacLeod and Sammel, 1982). Accordingly, Newberry 2, a 932 m deep drill hole was drilled by the |  | | Report (issue) | | 370 m) were collected for this investigation. Volcanic glass and open spaces of fractures, vesicles,...drill holes located both outside and within the caldera show the effects of hydrothermal alteration. The...(DonnellyNolan and others, 1990). The most recent volcanic activity (about 900 years ago), at Glass Mountain...Mountain, occurs in the vicinity of the 7 x 12 km caldera (Figure 2) (Donnelly-Nolan and others, 1990). Figure...548°C km" 1 are given for 3 wells sited within the caldera of Medicine Lake volcano (Donnelly-Nolan and others |
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