Mineral assessment of the Lime Peak-Mt. Prindle area, Alaska

Miscellaneous Publication 29, Mineral assessment of the Lime Peak-Mt. Prindle area, Alaska, presents 1:63,360-scale, reconnaissance bedrock and surficial geologic mapping of the Lime Peak - Mt. Prindle area located in the Yukon-Tanana uplands, about 75 miles northeast of Fairbanks, Alaska. The area is part of the Yukon-Tanana terrane. In Alaska, the Yukon-Tanana terrane is composed of a least two sequences of metamorphic rocks with protoliths of Paleozoic and possibly late Precambrian age. These sequences consist of 1) quartz mica schist, quartzite, grit, maroon and green phyllite and slate, and black arenaceous limestone; and 2) quartzite, mica schist, marble, and metamorphosed mafic and ultramafic igneous rocks. The regionally metamorphosed and folded bedrock units in the project area have been intruded by three large, multiphase, biotite granite bodies, which are informally known as the Hope granitic suite, and include the Lime Peak, Quartz Creek, and Mt. Prindle intrusive bodies. In addition to the large plutons of the Hope granitic suite, five other types of intrusive rock are present in the Lime Peak - Mt. Prindle area. They include 1) an 85 to 90 Ma old alkalic suite of hornblende quartz monzonite, lamprophyre, and syenite, 2) the Pinnell Trail monzogranite, 3) felsite dikes and stocks that appear to be associated with the alkalic suite, 4) sills and dikes of gabbro and minor amounts of ultramafic rock in the northwest part of the area, and 5) gabbro dikes that intrude the Hope suite granitic rocks. Lode mineral deposits are present throughout the study area. Surficial deposits from mass-wasting processes mantle much of the bedrock in the Lime Peak - Mt. Prindle area. Glacial, glacio-fluvial, and fluvial processes have also contributed to local surficial deposits. Bedrock-rubble colluvium and solifluction lobes include reworked drift in cirque valleys and are present on high, steep slopes. Drift with morainal form is present in the highest elevation cirque valleys. Low-slope colluvium and alluvial-fan deposits are present on lower slopes and along the flanks of larger stream valleys. Alluvium and outwash are present in small terraces and along active stream channels. The complete report, geodatabase, and ESRI fonts and style files are available from the DGGS website: http://doi.org/10.14509/731.

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Organization: State of Alaska