June 2017 

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Paleo-nano to microearthquakes on hematite fault mirrors in the Wasatch fault damage zone, UT

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Resource details

Resource ID

504

Access

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Contributed by

Admin User

Volume

49

Named person(s)

Dr. Alexis K. Ault

Date

12 June 17

Number

6

Abstract

Hematite-coated slip surfaces in
fault damage zones record thermal
and mechanical processes operative
within fault systems. Hematite is
amenable to (U-Th)/He (hematite
He) thermochronometry and
accurate interpretation of hematite
He data requires hematite textural
characterization, grain-size
distribution data, and constraints on
the ambient thermal conditions
during and after hematite formation
from apatite (U-Th)/He (apatite He)
thermochronometry. Here, we apply
this workflow to a network of high
gloss, light reflective hematite “fault
mirrors” in the exhumed Wasatch
fault zone, UT. Polygonal hematite
crystal morphology, coupled with
hematite He data patterns from

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