Stratigraphy, age, and structural evolution of South Dome Rock Mountains basin, southeast Blythe basin, Arizona

Brickey, Timothy Andrew (2022) Stratigraphy, age, and structural evolution of South Dome Rock Mountains basin, southeast Blythe basin, Arizona. Masters thesis, Northern Arizona University.

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Abstract

The Colorado River extensional corridor, an area affected by large-magnitude Basin and Range extension and overprinted by younger transtensional deformation, provides an opportunity to study the inboard deformation associated with the inception and evolution of the Pacific-North America plate boundary. Earlier work shows that not all post-middle Miocene dextral shear predicted to have occurred across the Pacific-North America plate boundary east of the San Andreas fault is accounted for in the Colorado River extensional corridor region. Some or all of the unaccounted dextral shear may have occurred in the Blythe pull-apart basin, a sedimentary basin in the Colorado River extensional corridor that has been interpreted as a fault-bounded pull-apart basin related to the inboard part of the Pacific-North America plate boundary. At the southeast margin of the Blythe pull-apart basin, geologic mapping coupled with my new geochronologic, stratigraphic, and structural analysis of the south Dome Rock Mountains basin and related fault systems suggest (1) the older fluvial section of the basin formed between ~35 and ~23.7 Ma, before regional Basin and Range extension; (2) a series of ~23.7–22 Ma volcanic rocks record Basin and Range volcanism in the area; (3) the upper basin formed above the hanging wall of the southwest-dipping listric south Dome Rock Mountains fault from 22–12.8 Ma; and (4) the basin was inverted and deformed by <12.8 Ma dextral shear.

Item Type:	Thesis (Masters)
Publisher’s Statement:	© Copyright is held by the author. Digital access to this material is made possible by the Cline Library, Northern Arizona University. Further transmission, reproduction or presentation of protected items is prohibited except with permission of the author.
Keywords:	Colorado River extensional corridor; North America-Pacific plate boundary; sedimentary basin; southern Basin and Range; structure; tectonics
Subjects:	Q Science > QE Geology
NAU Depositing Author Academic Status:	Student
Department/Unit:	Graduate College > Theses and Dissertations College of the Environment, Forestry, and Natural Sciences > School of Earth Sciences and Environmental Sustainability
Date Deposited:	14 Jul 2022 17:34
Last Modified:	14 Jul 2022 17:34
URI:	https://openknowledge.nau.edu/id/eprint/5852

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