Three-Dimensional Geologic Map of the Southern Carson Sink, Nevada, Including the Fallon FORGE AreaBy

Drew L. Siler1, James E. Faulds2, Jonathan M.G. Glen1, Nicholas H. Hinz2, Jeffrey B. Witter3, Kelly Blake4, John Queen5, and Mark Fortuna6

2019 ISSN 2329-132X (online)https://doi.org/10.3133/sim3437

1U.S. Geological Survey2Nevada Bureau of Mines and Geology3Innovate Geothermal Ltd. 4Navy Geothermal Program Office5Hi-Q Geophysical Inc.6MAF Seismic LLC

Any use of trade, product, or firm names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Government

This map or plate is offered as an online-only, digital publication. Users should be aware that, because of differences in rendering processes and pixel resolution, some slight distortion of scale may occur when viewing it on a computer screen or when printing it on an electronic plotter, even when it is viewed or printed at its intended publication scale

Digital files available at https://doi.org/10.3133/sim3437

Suggested citation: Siler, D.L., Faulds, J.E., Glen, J.M.G., Hinz, N.H., Witter, J.B., Blake, K., Queen, J., and Fortuna, M., 2019, Three-dimensional geologic map of the southern Carson Sink, Nevada, including the Fallon FORGE area: U.S. Geological Survey Scientific Investigations Map 3437, pamphlet 22 p., https://doi.org/10.3133/sim3437.

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EXPLANATION OF MAP SYMBOLS[Some software artifacts are visible on the maps. For example in the plan views, where faults meet the edge of the map, they may show a short tick along the edge that is an artifact, not a sharp turn in the fault. FORGE, Frontier Observatory for Research in Geothermal Energy]

Contact—Solid where location is accurate. Shown only on views of the surface

Normal fault—Dashed on surface where location is inferred from geophysi-cal data; solid on cross-sections. Ball and bar on hanging wall for surface trace; no bar and ball on subsurface plan views

Fallon FORGE area—Showing area of detailed subsurface mapping within the southern Carson Sink 3–D map. See figures 2 and 3 in pamphlet for location

Fallon FORGE site—Showing surface area of Fallon FORGE site. See figures 2 and 3 in pamphlet for location

Well location3–D maps

Surface—Showing well name

Cross sectionsSubsurface—Showing well name and units mapped in well core or cuttings. Unit color may appear darker than shown in List of Map Units to distinguish it from the same underlying unit color

Plan viewsSurface—Showing well name

Subsurface—Showing well name

Rotational axis for oblique perspective views of 3–D map

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LIST OF MAP UNITS[See Description of Map Units (in pamphlet) for complete unit descriptions]

UNCONSOLIDATED DEPOSITS

Surficial sediments and sedimentary rocks, undivided (Holocene, Pleisto-cene, and Pliocene)

Sedimentary rocks (late Pliocene to Miocene)

BEDROCK

VOLCANIC ROCKS

Volcanic rocks, undivided (Miocene)

MESOZOIC CRYSTALLINE BASEMENT

Metamorphic and plutonic rocks, undivided (Cretaceous, Jurassic, and Triassic)

Quartz monzonite (Cretaceous or Jurassic)

Metabasalt (Jurassic)

Quartzite with lesser phyllite, metabasalt, and marble (Jurassic)

Metarhyolite with lesser metabasalt (Jurassic or Triassic)

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CORRELATION OF MAP UNITS

UNCONSOLIDATED DEPOSITS

BEDROCK

QUATERNARY AND TERTIARY

Miocene

Holocene,Pleistocene, and Pliocene

[See Description of Map Units (in pamphlet) for precise unit ages]

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Index map showing location of map area and regional features. See figure 1 in pamphlet for detailed geologic and geographic information in and around the map area.

NEVADA

MAP LOCATION

Data interpreted and compiled by D.L. Siler and co-authors (2015–2018) from well cuttings and cores (https://gdr.openei.org/submissions/1027); seismic reflection data (https://gdr.openei.org/submissions/1011); rock density, magnetic susceptibility, and magnetic remanence data from core samples, paleomagnetic cores, and representative hand samples (https://gdr.openei.org/submissions/990); and potential field data (https://doi.org/10.5066/F7J38RVZ) Database and movie by D.L. SilerEdited by J.L. Zigler; digital cartographic production by J.F. Mangano; movie production by G. DangManuscript approved for publication August 12, 2019

Universe Transverse Mercator projection, Zone 11North American Vertical Datum of 1983

Cross Sections Through Southern Carson Sink 3–D Geologic Map [Well data within 500 m projected to sections. See oblique views for cross-section locations]

Plan Views of the Southern Carson Sink 3–D Geologic Map[Background grid is 500 m]

Oblique View Looking North of the Surface of the Southern Carson Sink 3–D Geologic Map[Labeled wells contributed downhole lithologic data (pamphlet, fig. 4) and (or) downhole fracture data (pamphlet, fig. 10)]

Oblique Sliced Views of the Southern Carson Sink 3–D Geologic Map[Background grid is 500 m; shading indicates perspective relative to light source from north-northwest]

Oblique View Looking North-Northwest[slices are north-south and east-west]

Oblique View Looking North-Northeast[slices are north-south and east-west]

U.S. Department of the InteriorU.S. Geological Survey

Scientific Investigations Map 3437Pamphlet and movie accompany map