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The Neogene Hawkins Basin bimodal volcanic center, and multiple extensional fault sets, Wakley Peak 75 quadrangle, SE Idaho


, : The Neogene Hawkins Basin bimodal volcanic center, and multiple extensional fault sets, Wakley Peak 75 quadrangle, SE Idaho. Abstracts with Programs - Geological Society of America 32(5): 36

The Wakley Peak 7.5' quadrangle is located about 40 miles south of Pocatello, Idaho in the southern Bannock Range in the Basin and Range physiographic province. The bedrock stratigraphy of the area ranges from the Neoproterozoic Mutual Formation to the Ordovician-Silurian Fish Haven and/or Laketown dolomites. Normal fault sets, preserved in the bedrock and possibly locally in the Miocene and Pliocene Hawkins Basin volcanics and Salt Lake Formation, represent three to five Early Miocene to Pleistocene (?) extensional events. From oldest to youngest, the fault sets include remnants of one or more low-angle normal faults, numerous north-south- and east-west-trending intra-range normal faults, one or more northeast-trending normal faults, and the range-bounding normal faults (including the northern extension of the Wasatch normal fault). The low-angle fault(s) may be part of the regional Bannock detachment system proposed by S. Janecke and J. Evans (in Hughes and Thackray, eds., Geology of Eastern Idaho, IMNH, 1999). The structurally complex southeast corner of the map probably represents a transfer zone from a southern west-dipping range-bounding fault to a northern east-dipping range-bounding fault. Field relations reveal that tuffaceous sedimentary rocks of the regional Miocene-Pliocene Salt Lake Formation were deposited before most or all of the local volcanism occurred. Rocks of the bimodal Late Miocene (?) to Early Pliocene (?) Hawkins Basin volcanic center, represented mostly by three or more intermediate to rhyolitic lava flows and associated fallout pumice and ash (mined for pumice and perlite along Wright Creek Road by Hess Pumice, Inc. and Idaho Minerals, Inc.), underlie most of the northern part of the quadrangle. The stratigraphy exposed in the Hess Pumice pit (fallout pumice lapilli, with pumice blocks, perlitized rhyolite and obsidian in basal layers) indicates a cyclic sub-Plinian eruption. East of Rattlesnake Peak, a suite of north- to northwest-trending diabase dikes may have fed one or more of the nearby basalt flows.

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