24 research outputs found
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Geologic Map of the Tule Wash 7 ½’ Quadrangle, Mohave County, Arizona
The Big Sandy Valley is located in Mohave County, northwestern Arizona, and lies between the Hualapai Mountains to the west and the Aquarius Mountains to the east. In Fall 2020, the Arizona Geological Survey began a multi-year mapping campaign starting with the Gunsight, Aubrey Peak (formerly Wikieup NW), Tule Wash, Wikieup, and northern half of the Greenwood Peak 7.5’ quadrangles. Most of the Aquarius and Hualapai Mountains consists of Paleoproterozoic metasedimentary and granitic gneisses, locally intruded by Mesoproterozoic igneous rocks. In the southern Hualapai Mountains, the older rocks are intruded by two late Cretaceous plutons, with several spatially extensive dike swarms. The two plutons, and at least some of the dikes, are associated with weakly-developed hydrothermal alteration and mineralization interpreted to be related to a porphyry copper system. A diverse assemblage of Miocene volcanic rocks are present in the Wikieup quadrangle. The basin itself hosts two sets of basin deposits in the Tule Wash formation and the Big Sandy Formation. Both formations have diverse and variable lithofacies, with the Tule Wash formation (defined in the Tule Wash quadrangle) generally moderately tilted and faulted, while the Big Sandy Formation is typically undeformed. River, tributary, and fan deposits record the history of basin filling and subsequent dissection due to integration into the larger Bill Williams River watershed.Documents in the AZGS Documents Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact [email protected]
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Geologic map of the Vulture Peak 7.5' Quadrangle, Maricopa County, Arizona
This geologic map is one of a series of four 7 ½’ quadrangle maps (AZGS DGM-131 through 134; Wickenburg, Sam Powell Peak, Flores, and Vulture Peak) in the Wickenburg area. New surficial mapping was conducted throughout the 4-quadrangle mapping area and bedrock mapping was compiled from existing geologic maps. Together, these maps include detailed surficial mapping of alluvium from the Date Creek, Weaver, Wickenburg, and Vulture Mountains as well as ancestral deposits of the Hassayampa River. The relationships between relict and modern alluvial fan and Hassayampa River deposits and their positions relative to pre-existing bedrock topography presents a glimpse into the arrival and development of the modern Hassayampa River system.Documents in the AZGS Documents Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact [email protected]
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Geologic Map of the southern half of the Tom Brown Canyon 7.5’ Quadrangle, Mohave County, Arizona
The Big Sandy Valley is located in Mohave County, northwestern Arizona, and lies between the Hualapai Mountains to the west and the Aquarius Mountains to the east. In Fall 2020, the Arizona Geological Survey began a multi-year geologic mapping campaign starting with the Gunsight Canyon, Aubrey Peak, Tule Wash, Wikieup, and northern half of the Greenwood Peak 7.5’ quadrangles. Mapping continued in 2021-2022 with the Pilgrim Wash, Bottleneck Wash, and Dean Peak quadrangles, the southern half of the Tom Brown Canyon quadrangle, and the eastern half of the Hibernia Peak quadrangle. The Aquarius and Hualapai Mountains are underlain by Paleoproterozoic gneiss intruded by Paleoproterozoic and Mesoproterozoic plutonic rocks. In the Hualapai Mountains, these rocks have been intruded locally by late Cretaceous plutons and several spatially extensive dike swarms. Two plutons in the southern Hualapai Mountains, and at least some of the dikes, are associated with weakly developed hydrothermal alteration and mineralization inferred as being related to a porphyry copper system. On both sides of Big Sandy Valley, the plutonic and metamorphic basement rocks are overlain unconformably by two successions of predominantly sedimentary basin-fill deposits. The lower succession, the Tule Wash formation (informally defined in the Tule Wash quadrangle), together with its basement has been dissected and tilted by Basin-and-Range normal faults. This succession and the older rocks are overlain unconformably by the Big Sandy Formation, which is generally undeformed. River, tributary, and fan deposits record the history of basin filling and subsequent dissection due to integration into the larger Bill Williams River watershed.Documents in the AZGS Documents Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact [email protected]
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Limestone discovery in the McDowell Sonoran Preserve
Our interdisciplinary team of a geologist and volunteers, working with the City of Scottsdale and the McDowell Sonoran Conservancy (MSC), has confirmed that an unusual rock outcropping in the McDowell Mountains within the McDowell Sonoran Preserve in Scottsdale is travertine, a form of limestone. Limestone has not been identified previously in the McDowell Mountains or in the metro Phoenix area. This research is part of a coordinated effort on the part of MSC and the City of Scottsdale’s Preservation Division to use the talents and energy of MSC volunteers to better understand the geologic setting of the McDowell Sonoran Preserve. Travertine is a whitish sedimentary rock consisting of calcium carbonate. Travertine forms when calcium carbonate is deposited by mineral springs. There also is evidence of possible plant fossils and algal residue associated with the travertine. Our preliminary analysis indicates that the travertine was deposited 2 to 20 million years ago, during the formation of the McDowell Mountains.Documents in the AZGS Document Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact [email protected]
Recommended from our members
Limestone discovery in the McDowell Sonoran Preserve
Our interdisciplinary team of a geologist and volunteers, working with the City of Scottsdale and the McDowell Sonoran Conservancy (MSC), has confirmed that an unusual rock outcropping in the McDowell Mountains within the McDowell Sonoran Preserve in Scottsdale is travertine, a form of limestone. Limestone has not been identified previously in the McDowell Mountains or in the metro Phoenix area. This research is part of a coordinated effort on the part of MSC and the City of Scottsdale’s Preservation Division to use the talents and energy of MSC volunteers to better understand the geologic setting of the McDowell Sonoran Preserve. Travertine is a whitish sedimentary rock consisting of calcium carbonate. Travertine forms when calcium carbonate is deposited by mineral springs. There also is evidence of possible plant fossils and algal residue associated with the travertine. Our preliminary analysis indicates that the travertine was deposited 2 to 20 million years ago, during the formation of the McDowell Mountains.Documents in the AZGS Documents Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact [email protected])
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Geologic map of Sam Powell Peak 7.5' Quadrangle, Yavapai County, Arizona
This geologic map is one of a series of four 7 ½’ quadrangle maps (AZGS DGM-131 through 134; Wickenburg, Sam Powell Peak, Flores, and Vulture Peak) in the Wickenburg area. New surficial mapping was conducted throughout the 4-quadrangle mapping area and bedrock mapping was compiled from existing geologic maps, with new bedrock mapping in Sam Powell Peak. Together, these maps include detailed surficial mapping of alluvium from the Date Creek, Weaver, Wickenburg, and Vulture Mountains as well as ancestral deposits of the Hassayampa River. The relationships between relict and modern alluvial fan and Hassayampa River deposits and their positions relative to pre-existing bedrock topography presents a glimpse into the arrival and development of the modern Hassayampa River system. The Sam Powell Peak 7 ½' Quadrangle is located north of the town of Wickenburg and southeast of the town Congress in Yavapai County, Arizona. A system of interconnected dirt roads connects the map area to the town of Wickenburg and US Highway 93 to the south, and AZ Highway 89 to the west: Scenic Loop road, Stanton Hall road, and Angels Ranch road. Most of the mapping area is owned by State Trust lands and Bureau of Land Management (BLM) with minor private lands. The Hassayampa River Canyon Wilderness area along the Hassayampa and Sam Powell Peak areas is managed by BLM. Bedrock in the southern half of Sam Powell Peak quadrangle was mapped separately as part of the EDMAP grant (award no. G18AC00230). The main focus of surficial mapping in the Sam Powell Peak quadrangle was Neogene and Quaternary basin-fill deposits, Hassayampa River deposits, and tributary deposits. The Hassayampa River flows between the Weaver Mountains (and its namesake Sam Powell Peak) to the north and northwest, the Wickenburg Mountains to the east, across the Black Hills to the south, and an unnamed topographic ridge and hydrologic boundary to the west. The intervening valley between these topographic highs is informally referred to as the “Sam Powell basin”. Bedrock mapping focused on highly extended mid-Cenozoic volcanic and sedimentary rocks and their underlying Proterozoic and Laramide crystalline basement.Documents in the AZGS Documents Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact [email protected]
Recommended from our members
Geologic Map of the Pilgrim Wash 7 ½’ Quadrangle, Mohave County, Arizona
Geologic Map of the Pilgrim Wash 7 ½’ Quadrangle, Mohave County, ArizonaDocuments in the AZGS Documents Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact [email protected]
Inhibition of growth of Histoplasma capsulatum yeast cells in human macrophages by the iron chelator VUF 8514 and comparison of VUF 8514 with deferoxamine.
Histoplasma capsulatum requires intracellular iron to survive and multiply within human and murine macrophages (M phi). Thus, iron chelators may be useful compounds in the treatment of histoplasmosis. In the present study we compared the efficacies of five different iron chelators with deferoxamine (DEF) for their capacity to inhibit the growth of H. capsulatum yeast cells in culture medium and within human M phi. Of the agents tested, only one, VUF 8514, a 2,2'-bipyridyl analog, was found to be effective. VUF 8514 inhibited the growth of yeast cells in tissue culture medium and within M phi in a dose-response fashion. In tissue culture medium, the 50% effective dose (ED50) of VUF 8514 was 30 nM and the ED50 of DEF was 1 mM. In human M phi, the ED50 of VUF 8514 was 520 nM and the ED50 of DEF was 4 mM. Thus, VUF 8514 was effective at a concentration 7.7 x 10(3)-fold lower than DEF in inhibiting the growth of yeast cells in M phi. Inhibition of the intracellular growth of yeast cells by VUF 8514 was reversed by holotransferrin and iron nitriloacetate, an iron compound that is soluble at neutral to alkaline pH. Thus, VUF 8514 inhibits the intracellular growth of yeast cells by acting as an iron chelator rather than through its capacity as a weak base. These data suggest that the hydroxamic acid siderophore of H. capsulatum yeast cells competes successfully for iron against some iron chelators but not others and that VUF 8514 may be a potential therapeutic agent for the treatment of histoplasmosis