Geology of an alpine-type peridotite in the Mount Sorenson area, east-central Alaska

Description

Geology of an alpine-type peridotite in the Mount Sorenson area, east-central Alaska, Professional Paper 1170-A, shows the distribution of a large serpentinized peridotite body, that crops out in the northeastern Eagle and the southwestern Charley River 1:250,000 quadrangles in the Yukon-Tanana Upland of east-central Alaska. The peridotite consists mainly of harzburgite, some dunite, and minor clinopyroxenite. All of the peridotite has been serpentinized to some extent, most extensively in the eastern part. Lizardite is the dominant serpentine mineral. Large tectonic inclusions of diabase have been altered, probably by metasomatism during serpentinization. Four small quartz-carbonate veins are also included. The peridotite crops out as a synform mass trending nearly east-west. Aeromagnetic contours closely follow the configuration of the outcrop. The rocks surrounding the peridotite include greenstone, metamorphosed basalt and gabbro, quartzite, mica-schist, greenschist, chert, phyllite, and other metamorphosed rocks of probable Paleozoic age. The ultramafic rocks are believed to have been tectonically emplaced and may be part of a dismembered ophiolite. The nearby Tintina fault, a major fault system with significant right-lateral displacement, may have been a deep suture along which mantle material was derived and abducted onto a slice of northwestward-moving continental crust. The complete report, geodatabase, and ESRI fonts and style files are available from the DGGS website: http://doi.org/10.14509/3987.

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Name Format Description Link
geodatabase Unknown CSDGM IMPORT ERROR: No digtinfo/formcont Open resource
Web Resource Unknown Open resource

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