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A prominent geophysical feature along the northern Nevada rift and its geologic implications, north-central Nevada

¹ U.S. Geological Survey, MS 989, 345 Middlefield Road, Menlo Park, California 94025, USA

View larger version (83K): [in this window] [in a new window]   Figure 1. Shaded-relief and simplified geologic map (modified from Stewart and Carlson, 1978) of north-central Nevada showing the location of the geophysically inferred crustal feature in north-central Nevada (rift crustal feature [R-CF]). Lines and symbols: Yellow diamonds—sediment-hosted gold deposits (Wallace et al., 2004a); red squares—pluton-related gold deposits (Wallace et al., 2004a); green circles—epithermal gold deposits (modified from John et al., 2000; Wallace et al., 2004a); NNRe, NNRc, and NNRw—apex of magnetic anomaly associated with the eastern, central, and western northern Nevada rifts; yellow lines—Battle Mountain–Eureka mineral trend (BMET) and Carlin (CAR) mineral trend; semi-transparent rectangle—extent of Battle Mountain–Eureka mineral trend deposits; black dashed line—Battle Mountain–Eureka belt (from Roberts, 1966); NV6—COCORP deep seismic-reflection profile (from Allmendinger et al., 1987); white lines—locations of geophysical models (A–F, see Watt et al., 2007); magenta line—initial 87Sr/86Sr = 0.7060 isopleth (from Tosdal et al., 2000); black square—Sawtooth dike; gray lines—major roads. Cities: BM—Battle Mountain; MCD—McDermitt; WIN—Winnemucca. Geography: BV—Boulder Valley; CAM—Clan Alpine Mountains; CM—Cortez Mountains; CV—Crescent Valley; DM—Diamond Mountains; EGR—Egan Range; ER—East Range; FCM—Fish Creek Mountains; GR—Grant Range; HR—Humboldt Range; IM—Independence Mountains; OM—Osgood Mountains; RM—Ruby Mountains; RRV—Reese River Valley; RbM—Roberts Mountains; SCH—Schell Creek Range; SCR—Sheep Creek Mountains; SHR—Sho-shone Range; SPM—Simpson Park Mountains; SRR—Santa Rosa Range; SSR—Sulfur Springs Range; TR—Toiyabe Range; TQR—Toquima Range.

View larger version (94K): [in this window] [in a new window]   Figure 2. (A) Aeromagnetic map of north-central Nevada. Inset box shows area of part B. (B) Aeromagnetic map emphasizing the central part of the eastern northern Nevada rift and its segments. Alternating black and white dashed lines—segments; black dashed line—extent of the eastern northern Nevada rift zone (modified after John et al., 2000). See Figure 1 for additional explanation.

View larger version (76K): [in this window] [in a new window]   Figure 2. (continued).

View larger version (95K): [in this window] [in a new window]   Figure 3. Isostatic gravity map of north-central Nevada. See Figure 1 for explanation.

View larger version (99K): [in this window] [in a new window]   Figure 4. Depth-to-basement map of north-central Nevada. See Figure 1 for explanation.

View larger version (94K): [in this window] [in a new window]   Figure 5. Basement gravity map of north-central Nevada. White bold dashed line—crustal boundary on east side of V-shaped basement gravity high (e.g., Ponce and Glen, 2002; Grauch et al., 2003a; Ponce, 2004). See Figure 1 for additional explanation.

View larger version (85K): [in this window] [in a new window]   Figure 6 (on this and following page). Filtered (A) magnetic, (B) gravity, and (C) basement gravity maps. Black circles—maximum directional derivatives (size is proportional to magnitude); white bold dashed line—crustal boundary on southeast side of V-shaped basement gravity high (Ponce and Glen, 2002; Grauch et al., 2003b; Ponce, 2004). See Figure 1 for additional explanation.

View larger version (89K): [in this window] [in a new window]   Figure 6 (continued).

View larger version (75K): [in this window] [in a new window]   Figure 6 (continued).