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首页> 美国政府科技报告 >Field Geology of the Northwest Quarter of the Broken Top 15' Quadrangle, Deschutes County, Oregon
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Field Geology of the Northwest Quarter of the Broken Top 15' Quadrangle, Deschutes County, Oregon

机译：俄勒冈州德舒特县破碎顶部15'四边形西北区的田野地质

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The report is a compilation of geologic field observations and supporting laboratory data obtained during a study of the eastern slope of the High Cascade Range of Oregon, north of Broken Top volcano. General geologic relationships are summarized, then followed by lithologic descriptions, petrographic characteristics, and stratigraphic information, cross-indexed to tables of chemical analyses of pertinent rock units. The 7.5-minute N.W. Broken Top quadrange is bounded by 44 sup 0 07'30'' and 44 deg 15'00'' north latitude and by 121 sup 0 37'30'' and 121 sup 0 45'00'' west longitude, 6 km east of North and Middle Sister volcanoes and 35 km northwest of Bend. The quadrangle is covered by glacial till and calc-alkaline lavas, most of which originated on the adjacent slopes of the High Cascades. Basalt, basaltic andesite, andesite, and rhyodacite are represented in a variety of forms including lava flows, volcanic domes, cinder cones, and a welded ash-flow tuff. (ERA citation 12:044219)

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