Geothermal resource assessment in the Aleutian Islands and Alaska peninsula: Quarterly progress report, January 1--March 30, 1989

• Main Authors: Turner, D.L., Nye, C.J.
• Language: unknown
• Published: 2007
• Subjects: 15 GEOTHERMAL ENERGY; GEOTHERMAL RESOURCES; RESOURCE ASSESSMENT; VOLCANIC ROCKS; AGE ESTIMATION; ALASKA; ALEUTIAN ISLANDS; ARGON; BIOTITE; PLUTONIC ROCKS; POTASSIUM; PROGRESS REPORT; VOLCANOES; X-RAY SPECTROSCOPY; ALKALI METALS; DOCUMENT TYPES; ELEMENTS; FEDERAL REGION X; FLUIDS; GASES; IGNEOUS ROCKS; ISLANDS; METALS; MICA; MINERALS; NONMETALS; NORTH AMERICA; RARE GASES; RESOURCES; ROCKS; SILICATE MINERALS; SPECTROSCOPY; USA; Alaska; Aleutian Islands
• Online Access: http://www.osti.gov/servlets/purl/6303120; https://www.osti.gov/biblio/6303120; https://doi.org/10.2172/6303120

In this report the authors have now completed dating work on 20 rock samples. Analytical results for the dated samples are given in the enclosed table. The results are generally in good agreement with observed stratigraphic relationships and provide a well-constrained time framework for the eruptive history of this volcanic area. The argon extraction and potassium analyses are completed and the argon sample is awaiting mass spectrometry. In addition to documenting the eruptive history of Umnak volcanoes, the K-Ar ages will provide a time framework for the chemical evolution of the magmatic system, when combined with the rock chemistry analyses presently in progress at U.C., Santa Cruz. 1 tab.