Electron microprobe analyses of zeolite minerals from Neogene volcanic rocks in the Breitenbush-Austen Hot Springs area, Oregon

Integrated diagenetic and sequence stratigraphy of a late Oligocene–early Miocene, mixed-sediment platform (Austral Basin, southern Patagonia): Resolving base-level and paleoceanographic changes, and paleoaquifer characteristics

“…This identifies a possible silica-rich clinoptilolite-K (e.g., Wise et al, 1969;Oscarson and Bargar, 1996;Ogihara, 2000;Morbidelli et al, 2001). The Al 2 O 3 content (~14%) is higher than expected (~12 wt.%), and may identify extra aluminum as an extra framework cation (Armbruster, 2001).…”

Zeolites and selected other hydrothermal minerals in the Cascade Mountains of northern Oregon

“…Quantitative chemical analyses for several zeolites and other minerals were obtained using either an ARL-SEMQ electron microprobe or JEOL JXA-8900L electron probe microanalyzer. The microprobe data for the Mount Hood area, Breitenbush-Austin Hot Springs area, and Newberry volcano are reported in Bargar, Keith and Beeson (1993), Oscarson and Bargar (1996), Bargar and Keith (in preparation), respectively. Both natural and synthetic mineral standards were used.…”

Estimated temperatures for geothermal drill holes at Medicine Lake Volcano, northeastern California, based on fluid inclusion and hydrothermal mineralogy studies

“…The composition of phillipsite can vary considerably from formulas (such as the one given above) provided in textbooks (Gottardi and Galli, 1985;Tschernich, 1992). Electron microprobe data (Table 6) for one specimen analyzed for this report is compared Table 6 near here with analyses of phillipsite from a geothermal drill hole in Oregon (OR phillipsite) (Oscarson and Bargar, 1996) and other phillipsites (Gottardi and Galli, 1985;Tschernich, 1992) (Figure 15). The figure shows a wide variation in compositions for phillipsite; Figure 15 near here however, the composition of phillipsite from the Oregon and Medicine Lake volcano geothermal drill holes is quite close.…”

“…In addition to potassium, the clinoptilolite specimen contains significant barium (Table 3) which usually is absent or a very minor constituent in other analyzed heulandite group minerals from the Cascade Mountains of Oregon (Oscarson and Bargar, 1996). Heulandite group minerals typically are found in Icelandic geothermal areas at low to moderate temperatures (about 60° to 170°C) (Kristmannsdottir and Tomasson, 1978).…”

“…Ca+Mg Na K+Ba+Sr ternary diagram for electron microprobe analyses of phillipsite from the ML 18-34 drill hole (data from Table 6) compared with analyses of phillipsite from Oregon (OR phillipsite) (Oscarson and Bargar, 1996) and other phillipsites (Gottardi and Galli, 1985;Tschernich, 1992). Scanning electron micrograph showing acicular to fibrous crystals of scolecite that fills vesicles at 1,039.4 m depth in the ML 86-23 drill hole.…”