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Uranium Sampling in part of Central Arizona Arch

Geology & uranium potential of Proterozoic rocks of the Central Arizona Arch and the Tonto Basin, Arizona

On 18 Dec. 2017, the AZGS released for the first time Phil Anderson’s dissertation mapping of the Bradshaw Mountains. This included the Proterozoic geology of 11 topographic quadrangles in the heart of Arizona’s Transition zone south of Prescott, Arizona.

Today, we are releasing a second suite of Phil Anderson’s geologic mapping and research of Proterozoic rocks. This suite includes geologic mapping and detailed geochemical sampling of the Central Arizona Arch that covers roughly 3,000 square miles in central Arizona (Figure 1 below). Six of the eight maps released here inform Anderson and Wirth’s research on uranium potential in Precambrian conglomerates of the Central Arizona Arch; part of the Dept. of Energy’s National Uranium Research Evaluation (NURE) program. The two additional maps include geologic mapping of the Tonto Basin.

To help contextualize the NURE mapping, we are including a digital copy of Anderson & Wirth’s 1981 report,” Uranium potential in Precambrian Conglomerates of the Central Arizona Arch: Final Report. National Uranium Resource Evaluation (NURE), GJBX-33(81), 588 p.” Figures 2, 3, 4, 5, 6, and 32 are referenced in that report.

Here is a brief description of the scope and areal footprint of each map.

Central Arizona Arch Maps

  • Figure 2. Central Arizona Arch Study Area. Compilation of mineral Data and Previous geologic studies. Approximate footprint 111.5 W – 110.5 W; 34.50 N – 33.5 N (Base Map – Mesa & Holbrook AMS 2-degree sheets (1: 250,000 enlarged to 1: 125,000).  Includes mining localities and commodity.  Annotated with legend.  
  • Figure 3. Central Arizona Arch Study Area II. Geology of Precambrian Conglomerates.
  • Approximate footprint 111.50 W – 110.50 W; 34.50 N - 33.50 N, (Base Map – Mesa & Holbrook AMS 2-degree sheets (1: 250,000 enlarged to 1: 125,000). Includes legend.
  • Figure 4. Central Arizona Arch Study Area III. Geochemical Samples & Results. Approximate footprint 111.50 W – 110.50 W; 34.50 N - 33.50 N, (Base Map – Mesa & Holbrook AMS 2-degree sheets (1: 250,000 enlarged to 1: 125,000).  Includes geochemistry key.
  • Figure 5. Mazatzal Wilderness Study Area: Preliminary Geologic Map of Mazatzal Group Outcrops. Approximate footprint 111.625 W – 111.375; 34.25N - 34 N.  Base maps: Cypress Butte, North Peak, Mazatzal Peak and Table Mtn. 7.5’ quadrangle. Includes legend.
  • Figure 6. Mazatzal Wilderness Study Area: Geochemical Samples and Results. Approximate footprint 111.625 W – 111.375; 34.25N - 34 N.  Base maps: Cypress Butte, North Peak, Mazatzal Peak and Table Mtn. 7.5’ quadrangle. Annotated map and Includes geochemical key.
  • Figure 32. Central Arizona Arch Study Area: Precambrian Paleogeographic Setting. Approximate footprint 111.50 W – 110.50 W; 34.50 N - 33.50 N. (Base Map – Mesa & Holbrook AMS 2-degree sheets (1: 250,000).  Annotated map.

Tonto Basin Maps

  • Figure North Tonto Basin overview– Sketch geologic map with explanation.
  • Figure Tonto Basin Structural Geology Overview  -  Base Maps: 1:62,500 and 1:24,000 topo’s; McFadden Peak, Woods Canyon, Young, Payson North, Diamond Point, Promontory Butte, Payson South, Mcdonald Mtn., Diamond Butte, Gisela, Sheep Basin Mtn., Buzzard Roost Mesa, Kayler Butte, Picture Mtn., Copper Mtn.

Acknowledgments. Michael Doe helped scan the eight maps and also provided a digital copy of the Anderson and Wirth (1981) report.

Citation: Anderson, P., 2018, Geologic and Geochemical Sampling maps from the Central Arizona Arch project: Uranium potential in Precambrian conglomerates. Arizona Geological Survey Contributed Map 18-A, 8 map plates and DOE NURE Report.

Posted 1/5/2018 M. Conway
 

Study area and example of sampling array
Figure 1. Study area of Central Arizona arch and example of geochemical sampling density.