Geophysical studies in the Yuma area, Arizona and California

Mattick, Robert E.; Olmsted, F.H.; Zohdy, Adel A.R.

doi:10.3133/pp726d

Cited by 8 publications

(11 citation statements)

References 16 publications

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“…The Bouse Formation was defi ned in the Blythe basin and its geographic extent has since been expanded to include the MohaveCottonwood, Chemehuevi, and Bristol basins along and near the lower Colorado River corridor in Arizona, California, and Nevada (Metzger, 1968;Olmsted, 1972;Mattick et al, 1973;Olmsted et al, 1973;Carr and Dickey, 1980;Buising, 1988;Turak, 2000;House et al, 2008). Except for a disputed outcrop near the Laguna Diversion and Imperial Dams (sample locality J219 of Winterer, 1975; see also Olmsted et al, 1973, fi g. 15 therein), the Bouse Formation is identifi ed only in the subsurface in the Yuma area of Arizona McDougall , 2008a;Spencer et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Evidence for a marine incursion along the lower Colorado River corridor

McDougall

Martínez

2014

Geosphere

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Foraminiferal assemblages in the stratigraphically lower part of the Bouse Formation in the Blythe basin (lower Colorado River corridor, western USA) indicate marine conditions, whereas assemblages in the upper part of the Bouse Formation indicate lacustrine conditions and suggest the presence of a saline lake. Benthic foraminiferal assemblages in the lower part of the Bouse Formation are similar to lagoonal and inner neritic biofacies of the modern Gulf of California. Evidence suggesting a change from marine to lacustrine conditions includes the highest occurrence of planktic foraminifers at an elevation of 123 m above sea level (asl), the change from low diversity to monospecifi c foraminiferal assemblages composed only of Ammonia beccarii (between 110 and 126 m asl), an increase in abundance of A. beccarii specimens (above ~110 m asl), increased number of deformed tests (above ~123 m asl), fi rst appearance of Chara (at ~85 m asl), lowest occurrence of reworked Cretaceous coccoliths (at ~110 m), a decrease in strontium isotopic values (between 70 and 120 m), and δ 18 O and δ 13 C values similar to seawater (between 70 and 100 m asl). Planktic foraminifers indicate a late Miocene age between 8.1 and 5.3 Ma for the oldest part of the Bouse Formation in the southern part of the Blythe basin. Benthic and planktic foraminifers correlate with other late Miocene sections in the proto-Gulf of California and suggest that the basal Bouse Formation in the Blythe basin was deposited at the northern end of this proto-gulf. After the marine connection was restricted or eliminated, the Colorado River fl owed into the Blythe basin, forming a saline lake. This lake supported a monospecifi c foraminiferal assemblage of A. beccarii until the lake spilled into the Salton Trough and the Colorado River became a through-fl owing river.

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Section: Introductionmentioning

confidence: 99%

Evidence for a marine incursion along the lower Colorado River corridor

McDougall

Martínez

2014

Geosphere

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“…The Yuma Hills are restored to align exposures and the proposed extent of the Bouse Formation with those along the western Gila Mountains (Plate 2), as suggested by Mattick et al (1973). The Hickiwan Valley (Plate 1) may have formed during the late Miocene, but is not restored due to insuffi cient data.…”

Section: The Sonoran Desert Regionmentioning

confidence: 93%

“…• Beikman, Haxel, and Miller (1995) • Dokka, Ross, and Lu (1998) • Dokka (1989) • Gray, Miller, Peterson, May, Tosdal, and Kahle (1985) • Grubensky, Haxel, and Demsey (1995) • Grubensky, Haxel, and Kock (1993) • Jennings (1977) • Kruger, Faulds, Reynolds, andOkaya (1998) • Mattick, Olmstead, andZohdy (1973) Richard (1992aRichard ( , 1992bRichard ( , 1992c • Sherrod and Tosdal (1991) • Spencer and Reynolds (1991) • Stewart (1998) • Walker, Black, Berry, Davis, Andrew, and Mitsdarfer (2002) • Wells and Hillhouse (1989) Depth to Basement • Oppenheimer and Sumner (1980) Terrane Boundaries • Anderson and Silver (1981) • Bowring and Karlstrom (1990) • Chamberlain and Bowring (1990) • Gray, Miller, Grubensky, Tosdal, Haxel, Peterson, May, andSilver (1987) • Silver (1964) • Silver (1968) • Wooden, Miller, and Howard (1988) • Wooden and Miller (1990) • Unpublished mapping and reconnaissance by John A. Dembosky Jr., Thomas H. Anderson, Jonathan A. Nourse, Erin Stahl, and Leon T. Silver…”

Section: Faultsmentioning

confidence: 97%

“…The ranges of southwesternmost Arizona (e.g., Gila, Tinajas Altas, Copper, Cabeza Prieta, and Mohawk Mountains; Plate 1) are separated by wide, deep basins (e.g., Mattick et al, 1973;Oppenheimer and Sumner, 1980) that suggest signifi cant early Miocene and subsequent extension. The Yuma Hills are restored to align exposures and the proposed extent of the Bouse Formation with those along the western Gila Mountains (Plate 2), as suggested by Mattick et al (1973).…”

Section: The Sonoran Desert Regionmentioning

confidence: 99%

“…Many large, deep basins in southwestern Arizona (and Sonora? ), such as the Mohawk Valley (Plate 1), were initiated during the early Miocene as inferred from the discovery of buried early Miocene volcanics during drilling and subsurface studies in the region (e.g., Eberly and Stanley, 1978;Mattick et al, 1973). 6.…”

mentioning

confidence: 99%

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A reconstruction of late Miocene to Recent transtension in the southwestern United States and northwesternmost Mexico

Dembosky¹,

Anderson²

2005

The Mojave-Sonora Megashear Hypothesis: Development, Assessment, and Alternatives

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A retrodeformable reconstruction of late Miocene and younger deformation based on a transtensional model, which combines extension and strike-slip motion, is proposed herein. The reconstruction incorporates and expands upon previous restorations of late Miocene (Basin and Range) strain east of the San Andreas transform and is supported by Pacifi c-NorthAmerica plate kinematics since 15.1 Ma. The study region extends south from the Garlock fault across the Mojave and Sonoran Deserts into southwestern Arizona and Sonora, Mexico. In the reconstruction, proposed late Miocene north-trending physiographic basins are treated as pull-apart structures at releasing steps within a system of linked northwest-striking, right-lateral strike-slip faults. Pull-apart structures are closed by restoring strike-slip fault displacements obtained from published fault offsets where available. In areas where published data are unavailable, restoration is based upon consideration of geologic markers, seismic interpretation, depth to basement studies, and studies of basin geometry. Rotations of crustal blocks in California are modeled after Powell (1993) and have not been recognized in southwestern Arizona and northwestern Sonora, Mexico. The late Miocene reconstruction shows total east-west elongation strain to be 9% (50 km). About 43 km of right-lateral strike-slip displacement is accommodated by northwest-trending faults east of the San Andreas fault between the Gila River and the Garlock fault. Total right-lateral separation of 77 km results from the incorporation of clockwise block rotations in the model. The reconstruction of late Miocene to Recent transtension:(1) reveals the partial effect of extensional disruption of the surfi cial trace of the Mojave-Sonora megashear, and (2) partially resolves some of the late Miocene "slip discrepancy" of dextral offsets between the Pacifi c and North American plates (~635 km), and that recorded in the Gulf of California (~300 km). Furthermore, the reconstruction assesses the relationship between transtensional strain in the desert region of the southwest and faults comprising the San Andreas transform plate boundary.

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Magnetic anomalies over the continents and their analyses

Zietz¹,

Bhattacharyya²

1975

Reviews of Geophysics

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It is significant that many countries of the world have undertaken aeromagnetic mapping programs to survey their nations in a reasonable period of time. The U.S.S.R., for example [Solov'yeva, 1968, 1971], had finished complete coverage by 1967 using a flight spacing of 2 km. The Canadian Geological Survey had initiated a program to map the entire Canadian Shield at a flight separation of 1/2 mi (804 m). Almost three fourths of the shield has now been flown, and the maps have been made available to the public [Hood, 1974]. Yet at this writing there is no national program to map the United States aeromagnetically. To date, published aeromagnetic maps are available for only 10% of the United States. Although at least half of the country has been adequately surveyed by private industry, the results have not been made available to the public. Most of the coverage in the United States has been provided by the U.S. Geological Survey, the funds often coming from other organizations, such as state geological surveys. For the past few years the U.S. Geological Survey has adopted a policy of promptly releasing aero‐magnetic data to the public via the open file route. These recent publications, mostly at a scale of 1:250,000, are cited in the bibliography at the end of this report.

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Geophysical studies in the Yuma area, Arizona and California

Cited by 8 publications

References 16 publications

Evidence for a marine incursion along the lower Colorado River corridor

Evidence for a marine incursion along the lower Colorado River corridor

A reconstruction of late Miocene to Recent transtension in the southwestern United States and northwesternmost Mexico

Magnetic anomalies over the continents and their analyses

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