April 2015 

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Resource ID

455

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Contributed by

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Volume

47

Date

13 April 15

Number

4

Abstract

New geologic mapping in southwest Utah redefines the
extent, age, and emplacement history of the early Miocene Markagunt gravity slide. The slide consists of
Miocene and Oligocene volcanic mudflow deposits, lava
flows, and volcaniclastic rocks derived from the Marysvale volcanic field, and intertonguing ash-flow tuffs derived from the Indian Peak-Caliente caldera complex. A basal slip surface with striations and Riedel shears, thin basal cataclastic breccia and associated clastic dikes, pseudotachylyte and ultracataclasite on shear planes and in dikes emanating from these shear planes, and crushed and rehealed clasts provide strong evidence of catastrophic emplacement from the north by gravity sliding. The uniformity of kinematic indicators, the stratigraphic sequence of volcanic rocks that make up upper plate strata, and the overall geometry of the gravity slide show that it represents a single emplacement event

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