Tectonic map of southeast Arizona

Drewes, Harald

doi:10.3133/ofr79775

Cited by 23 publications

(19 citation statements)

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“…22). The gravel contains abundant crystal-poor ignimbrite (38 pct) and basalt (15 pct, mapped as "andesite" by Drewes, 1980) (Table 2).…”

Section: Locality Descriptions Alluvial Fan Gravelmentioning

confidence: 99%

“…25) heads southwest of Mt. Wrightson in a structurally complex region in the Santa Rita Mountains composed of diverse volcanic, plutonic, and sedimentary rocks (Drewes, 1980). The fan, located east of the Santa Cruz River, was sampled at both distal and proximal positions (localities 17 and 19, respectively).…”

Section: Locality Descriptions Alluvial Fan Gravelmentioning

confidence: 99%

“…The Sierrita Mountains consist largely of volcanic and plutonic (granitic and related compositions) rocks, but also contain some conglomerate of Tertiary age (Drewes, 1980). The Esperanza Wash fan was sampled in distal and proximal locations.…”

Section: Locality Descriptions Alluvial Fan Gravelmentioning

confidence: 99%

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Reconnaissance of alluvial fans as potential sources of gravel aggregate, Santa Cruz River valley, Southeast Arizona

Lindsey¹,

Melick²

2002

Open-File Report

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“…22). The gravel contains abundant crystal-poor ignimbrite (38 pct) and basalt (15 pct, mapped as "andesite" by Drewes, 1980) (Table 2).…”

Section: Locality Descriptions Alluvial Fan Gravelmentioning

confidence: 99%

Section: Locality Descriptions Alluvial Fan Gravelmentioning

confidence: 99%

See 1 more Smart Citation

Reconnaissance of alluvial fans as potential sources of gravel aggregate, Santa Cruz River valley, Southeast Arizona

Lindsey¹,

Melick²

2002

Open-File Report

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“…8). These differences reflect a major contribution from the mountain reaches of Florida Canyon, where granitic rocks of Precambrian age dominate (Drewes, 1980), and presumably, crystal-poor ignimbrite is abundant but other volcanics with quartz are not.…”

Section: Gravel Lithologymentioning

confidence: 99%

Processes of Terrace Formation on the Piedmont of the Santa Cruz River Valley During Quaternary Time, Green Valley-Tubac Area, Southeastern Arizona

Lindsey¹,

Gosen²

2010

Scientific Investigations Report

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“…A long history of volcanism, plutonism, sedimentation, erosion and tectonism has created a complex geology in the region. In order to help unravel the tectonic history of the Tucson Basin, I model existing gravity (Davis, 1971;Gettings and Houser, 1997;Sweeney and Hill, 2001) and new high-resolution aeromagnetic data (Sweeney and Hill, 2001) constrained by borehole (Davidson, 1973;Eberly and Stanley Jr., 1978;Houser and Gettings, 2000), seismic reflection (Johnson and Loy, 1992), and geologic map (Anderson, 1987;Drewes, 1976;Drewes, 1980) data, thereby integrating available geophysical data with known geology in order to understand the structure of the Tucson Basin. The results are then compared to previous geophysical inversion models of the Tucson Basin.…”

Section: Introductionmentioning

confidence: 99%

Structure of the Tucson Basin, Arizona from gravity and aeromagnetic data

Rystrom¹

2003

Open-File Report

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Interpretation of gravity and high-resolution aeromagnetic data reveal the three-dimensional geometry of the Tuscson Basin, Arizona and the lithology of its basement. Limited drill hole and seismic data indicate that the maximum depth to the crystalline basement is approximately 3600 meters and that the sedimentary sequences in the upper ~2000 m of the basin were deposited during the most recent extensional episode that commenced about 13 Ma. The negative density contrasts between these upper Neogene and Quaternary sedimentary sequences and the adjacent country rock produce a Bouguer residual gravity low, whose steep gradients clearly define the lateral extent of the upper ~2000m of the basin. The aeromagnetic maps show large positive anomalies associated with deeply buried, late Cretaceousearly Tertiary and mid-Tertiary igneous rocks at and below the surface of the basin. These magnetic anomalies provide insight into the older (>13 Ma) and deeper structures of the basin. Simultaneous 2.5-dimensional modeling of both gravity and magnetic anomalies constrained by geologic and seismic data delineates the thickness of the basin and the dips of the buried faults that bound the basin. This geologic-based forward modeling approach to using geophysical data is shown to result in more information about the geologic and tectonic history of the basin as well as more accurate depth to basement determinations than using generalized geophysical inversion techniques. CONTENTS

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Tectonic map of southeast Arizona

Cited by 23 publications

References 0 publications

Reconnaissance of alluvial fans as potential sources of gravel aggregate, Santa Cruz River valley, Southeast Arizona

Reconnaissance of alluvial fans as potential sources of gravel aggregate, Santa Cruz River valley, Southeast Arizona

Processes of Terrace Formation on the Piedmont of the Santa Cruz River Valley During Quaternary Time, Green Valley-Tubac Area, Southeastern Arizona

Structure of the Tucson Basin, Arizona from gravity and aeromagnetic data

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