A tectonic boundary for the southern Colorado plateau

Research output: Contribution to journalArticle

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Abstract

A tectonic boundary should be defined by changes in tectonic elements. Tectonic elements would include such parameters as structural style, stress orientations, volcanism, heat flow, seismicity and changes in crustal thickness. Examination of these tectonic elements for the southern Colorado Plateau suggests that the southwestern part of the physiographic plateau appears to be tectonically part of the Basin and Range province. I therefore propose a boundary at 112° W longitude, the locus of seismicity and recent volcanism and also the site of crustal thickening and a change of structural style. The tectonic boundary of the southern Colorado Plateau is suggested to form part of the eastern boundary of the southern Basin and Range seismotectonic region. This seismotectonic region is bounded on the north by the Las Vegas shear zone/Nevada seismic zone and has a different stress orientation than the Northern Basin and Range from which it began to evolve separately 13 m.y. ago. The present principal stress orientation of the southern Basin and Range of Arizona appears to be the result of compound movements of the San Andreas transform and Garlock-Las Vegas shear zone resulting in a shear couple affecting the crust in Arizona and an associated NE-SW least principal stress orientation.

Original languageEnglish (US)
Pages (from-to)125-136
Number of pages12
JournalTectonophysics
Volume136
Issue number1-2
DOIs
StatePublished - May 1 1987

Fingerprint

Colorado Plateau (US)
tectonics
plateau
seismotectonics
shear
basin
shear zone
seismicity
volcanism
crustal thickening
seismic zone
crustal thickness
loci
longitude
heat transmission
heat flow
plateaus
crusts
transform
examination

ASJC Scopus subject areas

  • Earth-Surface Processes
  • Geophysics

Cite this

A tectonic boundary for the southern Colorado plateau. / Brumbaugh, David S.

In: Tectonophysics, Vol. 136, No. 1-2, 01.05.1987, p. 125-136.

Research output: Contribution to journalArticle

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