Depositional style and tectonic implications of the Mogollon Rim Formation (Eocene), east-central Arizona

Potochnik, Andre R.

doi:10.56577/ffc-40.107

Cited by 8 publications

(5 citation statements)

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“…The arkosic sediments unconformably underlie Oligocene to Miocene volcanic rocks and associated gravel scattered across a broad region of northern Arizona. A few fossils and isolated volcanic ash beds (Potochnik, 1989) have provided a limited regional chronology whose extrapolation from northern and central Arizona into southern Utah depends on acceptance of a Laramide tectonic framework to link the widely scattered depositional sequences, which appear to have formed under relatively humid climatic conditions.…”

Section: Regional and Local Correlation Problemsmentioning

confidence: 99%

“…The Late Cretaceous to Eocene ages of these similar Utah deposits provide indirect support for the proposed Laramide origin for the oldest terrestrial sediments on the Hualapai Plateau. Regionally, the Hualapai Plateau sediments and their apparent correlatives rest on the erosion surface that bevels the Cambrian through Cretaceous rock section of northern and central Arizona (Reynolds, I988;Young and others, 1989;Young, 1987Young, , 1993Potochnik, 1989).…”

Section: Cretaceous To Eocene Rocks In Southern Utah and Eastern Arizonamentioning

confidence: 99%

“…In eastern Arizona, Potochnik (1989) bracketed the age of part of his Mogollon Rim Formation between 57 Ma and 37 Ma (Eocene) in an area along the Mogollon Rim near Fort Apache (fig. AI).…”

Section: Cretaceous To Eocene Rocks In Southern Utah and Eastern Arizonamentioning

confidence: 99%

“…Arizona "Rim gravels," an alternative term appearing in the geologic literature of Arizona, is too imprecise and has been informally misapplied to a range of gravel deposits of probable Late Cretaceous through Pliocene age. It is equally inappropriate to extend the name, Mogollon Rim Formation (Potochnik, 1989), from deposits in eastern Arizona, due to the uncertainty of exact age equivalence. An unambiguous name is needed for the basal arkosic gravel on the Hualapai Plateau that can be applied to all the well-exposed reference sections in Milkweed, Hindu, and Peach Springs Canyons, as well as to the Frazier Wells and Blue Mountain gravels mapped by Koons on the eastern Hualapai Plateau and their equivalents on the Coconino Plateau.…”

Section: Revised Stratigraphy Of Laramide-age Rocks Music Mountain Fo...mentioning

confidence: 99%

“…The period representing channel erosion and subsequent deposition of the Music Mountain Formation and the closely related overlying West Water Formation probably is related to the lengthy period of regional tectonism, uplift, and thrust faulting associated with the Late Cretaceous to Eocene Laramide events that are documented south and west of the Colorado Plateau in Arizona, Nevada, Utah, and New Mexico (Goldstrand, 1992(Goldstrand, , 1994Potochnik, 1989;Leventhal and others, 1995). This is the most obvious, pre-Oligocene, regional tectonic episode of sufficient magnitude that can account for: (1) the broad regional erosion surface preserved below the Cretaceous(?…”

Section: Regional Orogenic Eventsmentioning

confidence: 99%

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Breccia-pipe and geologic map of the southwestern part of the Hualapai Indian Reservation and vicinity, Arizona

1999

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CONTENTS 10 4c. Two cross sections, 60° and 120° to each other, showing drill holes and intervals of anomalous gamma radiation. 11 Sa. Breccia-pipe alignments in the northeastern corner of the southwestern part of the Hualapai Indian Reservation. 13 5b. Many of the collapse features appear to be at equally spaced intervals from each other 14 5c. Schematic diagram illustrating that two nearly orthogonal joint sets (N. 55° W. and N. 57° E.

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Section: Regional and Local Correlation Problemsmentioning

confidence: 99%

Section: Cretaceous To Eocene Rocks In Southern Utah and Eastern Arizonamentioning

confidence: 99%

“…In eastern Arizona, Potochnik (1989) bracketed the age of part of his Mogollon Rim Formation between 57 Ma and 37 Ma (Eocene) in an area along the Mogollon Rim near Fort Apache (fig. AI).…”

Section: Cretaceous To Eocene Rocks In Southern Utah and Eastern Arizonamentioning

confidence: 99%

Section: Revised Stratigraphy Of Laramide-age Rocks Music Mountain Fo...mentioning

confidence: 99%

Section: Regional Orogenic Eventsmentioning

confidence: 99%

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Breccia-pipe and geologic map of the southwestern part of the Hualapai Indian Reservation and vicinity, Arizona

1999

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Detrital record of initial basement exhumation along the Laramide deformation front, southern Rocky Mountains

et al. 2016

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New geochronological constraints on upper crustal exhumation in the southern Rocky Mountains help delineate the latest Cretaceous–Paleogene history of drainage reorganization and landscape evolution during Laramide flat‐slab subduction beneath western North America. Detrital zircon U‐Pb results for the Raton basin of southern Colorado and northern New Mexico define the inception of coarse‐grained siliciclastic sedimentation and a distinctive shift in provenance, from distal to proximal sources, that recorded shortening‐related uplift and unroofing along the Laramide deformation front of the northern Sangre de Cristo Mountains. This Maastrichtian–early Paleocene (~70–65 Ma) change—from distal foreland accumulation of sediment derived from the thin‐skinned Cordilleran (Sevier) fold‐thrust belt to coarse‐grained sedimentation proximal to a Laramide basement block uplift—reflects cratonward (eastward) deformation advance and reorganization of drainage systems that supplied a large volume of Paleocene–lower Eocene sediments to the Gulf of Mexico. The timing of unroofing along the eastern deformation front is synchronous with basement‐involved shortening across the interior of the Laramide province, suggesting abrupt wholesale uplift rather than a systematic inboard advance of deformation. The growth and infilling of broken foreland basins within the interior and margins of the Laramide province had a significant impact on continental‐scale drainage systems, as several ponded/axial Laramide basins trapped large volumes of sediment and induced reorganization of major source‐to‐sink sediment pathways.

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Influence of climate change and uplift on Colorado Plateau paleotemperatures from carbonate clumped isotope thermometry

2010

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The elevation history of Earth's surface is key to understanding the geodynamic processes responsible for the rise of plateaus. We investigate the timing of Colorado Plateau uplift by estimating depositional temperatures of Tertiary lake sediments that blanket the plateau interior and adjacent lowlands using carbonate clumped isotope paleothermometry (a measure of the temperature‐dependent enrichment of 13C‐18O bonds in carbonates). Comparison of modern and ancient samples deposited near sea level provides an opportunity to quantify the influence of climate and therefore assess the contribution of changes in elevation to the variations of surface temperature on the plateau. Analysis of modern lake calcite from 350 to 3300 m elevation in the southwestern United States reveals a lake water carbonate temperature (LCT) lapse rate of 4.2 ± 0.6°C/km. Analysis of Miocene deposits from 88 to 1900 m elevation in the Colorado River drainage suggests that the ancient LCT lapse rate was 4.1 ± 0.7°C/km, and temperatures were 7.7 ± 2.0°C warmer at any one elevation than predicted by the modern trend. The inferred cooling is plausible in light of Pliocene temperature estimates off the coast of California, and the consistency of lapse rates through time supports the interpretation that there has been little or no elevation change for any of the samples since 6 Ma. Together with previous paleorelief estimates from apatite (U‐Th)/He data from the Grand Canyon, our results suggest most or all of the plateau's lithospheric buoyancy was acquired ∼80–60 Ma and do not support explanations that ascribe most plateau uplift to Oligocene or younger disposal of either the Farallon or North American mantle lithosphere.

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Depositional style and tectonic implications of the Mogollon Rim Formation (Eocene), east-central Arizona

Cited by 8 publications

References 0 publications

Breccia-pipe and geologic map of the southwestern part of the Hualapai Indian Reservation and vicinity, Arizona

Breccia-pipe and geologic map of the southwestern part of the Hualapai Indian Reservation and vicinity, Arizona

Detrital record of initial basement exhumation along the Laramide deformation front, southern Rocky Mountains

Influence of climate change and uplift on Colorado Plateau paleotemperatures from carbonate clumped isotope thermometry

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