Regional geophysical investigations in the La Sal Mountains area, Utah and Colorado

Case, James E.; Joesting, H.R.; Byerly, Perry

doi:10.3133/pp316f

Cited by 5 publications

(5 citation statements)

References 13 publications

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“…1). The minibasin has been established previously by Case et al (1963), Case & Joesting (1972), Doelling & Ross (1998), Boucher (2004, and Matthews et al (2004) based on structural, geophysical, and stratigraphic evidence, as well as the proximity to the Castle Valley salt-cored anticline. The Big Bend Minibasin is approximately 6 km by 6 km in area and lies north-west of the Castle Valley salt wall (Matthews et al, 2004) (Fig.…”

Section: Geological Settingmentioning

confidence: 81%

“…1). The minibasin has been established previously by Case et al. (1963), Case & Joesting (1972), Doelling & Ross (1998), Boucher (2004), and Matthews et al.…”

Section: Geological Settingmentioning

confidence: 99%

“…Castle Valley is a topographic inversion produced by dissolution and collapse of a breached, salt wall that is approximately 16 km long and 5 km wide (Figs 1 and 2). Regional gravity studies indicate that the wall has steep flanks with more than 2200 m of relief (Case et al, 1963;Case & Joesting, 1972). The Conoco Federal No.…”

Section: Geological Settingmentioning

confidence: 99%

“…1-31 well reached salt at about 2300 m, indicating a steep north-east margin for the salt wall (Figs 1 and 2). Gravity profile data indicate that the south-west margin of the salt wall is likely symmetrical (Case et al, 1963;Case & Joesting, 1972;Doelling & Ross, 1998). Over-thickened Permian and Triassic strata deposited within rim synclines (i.e.…”

Section: Geological Settingmentioning

confidence: 99%

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The influence of salt withdrawal subsidence on palaeosol maturity and cyclic fluvial deposition in the Upper Triassic Chinle Formation: Castle Valley, Utah

Prochnow¹,

Atchley²,

Boucher

et al. 2006

Sedimentology

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Integrated fluvial sequence stratigraphic and palaeosol analysis can be used to better reconstruct depositional systems, but these approaches have not been combined to examine halokinetic minibasins. This study characterizes the temporal and spatial patterns of lithofacies and palaeosols in a sequence stratigraphic framework to reconstruct a model of minibasin evolution and identify halokinetic influences on fluvial deposition. This research documents fluvial cycles and stratigraphic hierarchy, palaeosol maturity and apparent sediment accumulation rates in the Chinle Formation within the Big Bend minibasin. This study also uses palaeosols to help identify fluvial aggradational cycle (FAC) sets. The Chinle is divided into two hectometre‐scale (102 m) fluvial sequences, six decametre‐scale (101 m) FAC sets, and variable numbers of metre‐scale FACs depending on proximity to the minibasin. Ten pedotypes representing 225 palaeosol profiles are recognized. The pedotypes include palaeosols similar to modern Entisols, Inceptisols, Aridisols, Vertisols and Alfisols. A maturity index (1–5) is assigned to each pedotype to assess its variability in palaeosol development. Estimated palaeosol development time is used to approximate apparent sediment accumulation rates. Increased subsidence resulted in a greater number and thicker FACs, thicker FAC sets and fluvial sequence sections, and lithofacies associations reflecting more rapid sedimentation along the minibasin axis. Palaeocurrent indicators converge towards the minibasin axis and indicate that it formed and drifted through time. Relative palaeosol maturity is inversely related to stratal thickness, and decreases towards the minibasin where episodic burial by fluvial sediment was more frequent. Metre‐scale FACs are most abundant towards the minibasin axis, and locally have Entisols and Inceptisols developed upon their upper boundaries reflecting increased sediment accumulation rates. Areas outside the minibasin are characterized by fewer FACs that are associated with more mature palaeosols. Palaeosol‐derived apparent sediment accumulation rates are as much as two orders of magnitude greater within the minibasin than in marginal areas. The combined stratigraphic, palaeocurrent and palaeosol evidence is used to develop a model for the evolution of the Big Bend minibasin that illustrates the halokinetic affect on fluvial and landscape processes.

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Section: Geological Settingmentioning

confidence: 81%

“…1). The minibasin has been established previously by Case et al. (1963), Case & Joesting (1972), Doelling & Ross (1998), Boucher (2004), and Matthews et al.…”

Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

See 2 more Smart Citations

The influence of salt withdrawal subsidence on palaeosol maturity and cyclic fluvial deposition in the Upper Triassic Chinle Formation: Castle Valley, Utah

Prochnow¹,

Atchley²,

Boucher

et al. 2006

Sedimentology

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show abstract

“…From magnetic anomaly modeling, Case and Joesting (1963) calculated a floored laccolith mass that is 610-910 m thick forming North Mountain and 1220-1520 ft thick forming South Mountain. They suggested that steep northeast and northwest trending gravity gradients near latitude 38°30'N (plate 3) indicate zones of basement weakness that were intimately related to the formation of the north mountain group located near the intersection of the zones.…”

Section: Laccolithic Mountainsmentioning

confidence: 99%

Regional magnetic and gravity features of the Gibson Dome area and surrounding region, Paradox Basin, Utah: A preliminary report

Hildenbrand¹,

Kucks²

1983

Open-File Report

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Geophysical Anomalies Over Precambrian Rocks, Northwestern Uncompahgre Plateau, Utah and Colorado

Case¹

1966

Bulletin

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Regional geophysical investigations in the La Sal Mountains area, Utah and Colorado

Cited by 5 publications

References 13 publications

The influence of salt withdrawal subsidence on palaeosol maturity and cyclic fluvial deposition in the Upper Triassic Chinle Formation: Castle Valley, Utah

The influence of salt withdrawal subsidence on palaeosol maturity and cyclic fluvial deposition in the Upper Triassic Chinle Formation: Castle Valley, Utah

Regional magnetic and gravity features of the Gibson Dome area and surrounding region, Paradox Basin, Utah: A preliminary report

Geophysical Anomalies Over Precambrian Rocks, Northwestern Uncompahgre Plateau, Utah and Colorado

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