Sample: 79AYb 90
| Sample ID: | 79AYb 90 [1] | ||||||||||||
| Station ID: | 79AYb 90 | ||||||||||||
| AT Num: | |||||||||||||
| Volcano: | Blue Mtn | ||||||||||||
| Possible source: | |||||||||||||
| Eruption: | |||||||||||||
| Collector: | Yount, M. E. | ||||||||||||
| Date sampled: | 1979-01-01 | ||||||||||||
| Sample type 1: | Lava | ||||||||||||
| Color: | Light pinkish-gray | ||||||||||||
| Final unit: | |||||||||||||
| Text Description: | Light pinkish-gray (5 YR 8/1), vesicular hornblende plagioclase dacite (S; high-silica andesite G) porphyry. Extrusive, possibly a dome. Major phases are hornblende, plagioclase (An 54*), and glass. Poikilitic, brown to green pleochroic hornblende phenocrysts generally have sharp euhedral grain boundaries and no evidence of resorption. Plagioclase phenocrysts are unaltered, although grain boundaries are rounded and the phenocrysts have lines of inclusions in a thin zone parallel to the grain boundary, suggesting resorption and recrystallization. The plagioclase grains include weakly zoned and strongly oscillatory zoned grains that have an average composition of An 54 or greater. The very fine grained groundmass is primarily glass and devitrified glass and a small proportion of microcrystalline plagioclase and hornblende (?). | ||||||||||||
| Sample Location: |
       3 4 2 3 22 115 Great Sitkin Spurr Akutan Aniakchak Atka volcanic complex Augustine Cleveland Dutton Edgecumbe Fisher Gareloi Griggs Iliamna Isanotski Kanaga Katmai Little Sitkin Mageik Makushin Martin Novarupta Pavlof Redoubt Semisopochnoi Shishaldin Snowy Takawangha Tanaga Trident Ugashik-Peulik Ukinrek Maars Veniaminof Westdahl Wrangell Adagdak Addington volcanic field Alagogshak Amak Amchixtam Chaxsxii Amukta Andrew Bay volcano Basalt of Gertrude Creek Behm Canal-Rudyerd Bay Black Peak Bobrof Bogoslof Buldir Buzzard Creek Camille Cone Capital Carlisle Chagulak Chiginagak Churchill, Mt Cone 3110 Cone 3601 Dana Davidof Denison Devils Desk Double Glacier Douglas Drum Duncan Canal Emmons Lake Volcanic Center Espenberg Folsoms Bluff Fourpeaked Frosty Gas Rocks, the Gilbert Gordon Gosling Cone Hayes Herbert Imuruk Lake Volc Field Ingakslugwat Hills Ingenstrem Depression Volcanic Field Ingrisarak Mtn Iron Trig cone Iskut-Unuk River cones Jarvis Jumbo Dome Kagamil Kaguyak Kasatochi Kejulik Kialagvik Kiska Klawasi Group Knob 1000 Kochilagok Hill Koniuji Kookooligit Mountains Koyuk-Buckland volcanics Kukak Kupreanof Lone basalt Maclaren River volcanic field Moffett Monogenetic QT vents of WWVF Morzhovoi Nelson Island Nunivak Island Nushkolik Mountain volcanic field Okmok Pavlof Sister Prindle Volcano Rainbow River cone Recheshnoi Roundtop Sanford Seguam Segula Sergief Skookum Creek St. George volcanic field St. Michael St. Paul Island Steller Stepovak Bay 1 Stepovak Bay 2 Stepovak Bay 3 Stepovak Bay 4 Suemez Island Table Top Mtn Tanada Peak Tanax̂ Angunax̂ Tlevak Strait Togiak volcanics Uliaga Ungulungwak Hill-Ingrichuak Hill Unnamed (near Ukinrek Maars) Vsevidof Western Cones Wide Bay cone Yantarni Yunaska Legend ✕
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