Deep regional resistivity structure across the Battle Mountain-Eureka and Carlin trends, north-central Nevada

Rodriguez, Brian D.; Williams, Jackie M.

doi:10.3133/ofr01346

Cited by 8 publications

(8 citation statements)

References 19 publications

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“…The elevated attenuation anomaly in north central Nevada at longer periods (>20 s) correlates with the Battle Mountain high heat flow region, which may be caused by hydrothermal and magmatic activity from 1 to 20 km depth [e.g., Rodriguez and Williams , 2001]. The Walker Lane, a broadly distributed zone of strike‐slip and normal fault systems east of the Sierra Nevada Range, is highly attenuating at short and long periods.…”

Section: Discussionmentioning

confidence: 99%

Attenuation tomography of the western United States from ambient seismic noise

Lawrence¹,

Prieto²

2011

J. Geophys. Res.

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[1] We show that the spatial coherency of the ambient seismic field can be used for attenuation tomography in the western United States. We evaluate the real portion of the spatial coherency with an elastic geometric spreading term (a Bessel function) and a distance dependent decay (an attenuation coefficient). In order to invert the spatial coherency, a weight stack inversion technique is applied. We recover phase velocity and attenuation coefficient maps at periods of 8-32s, which correspond to the elastic and anelastic structure at crustal and upper mantle depths. The phase velocity maps obtained by this method are of similar resolution to more standard two-station methods. The attenuation results provide an important complement to the information extracted from earthquake-based tomography. Several geological features are easily identifiable in the attenuation coefficient maps, such as the highly attenuating sedimentary basins along the West Coast of the United States, and the highly attenuating Yellowstone region, and the boundaries of the Snake River Plains.

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Section: Discussionmentioning

confidence: 99%

Attenuation tomography of the western United States from ambient seismic noise

Lawrence¹,

Prieto²

2011

J. Geophys. Res.

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“…Moderately resistive (30 to 300 ohm-m) rocks were inferred to be volcanic and/or clastic sedimentary rocks. Evidence supporting these interpretations, such as exposures of Cretaceous quartz monzonite, Tertiary granodiorite, or widespread re-crystallized carbonates, and broad magnetic highs supporting the presence of large concealed plutons near MT stations, are reported in Rodriguez and Williams (2001;. Narrow, sub-vertical, 2-D, low-resistivity (1 to 30 ohm-m) conductors that penetrate to mid-crustal depths (5-20 km) are best explained by major crustal-scale fault or fracture zones.…”

Section: Geologic Correlationsmentioning

confidence: 92%

“…3 and 4) were rotated to maximum and minimum impedance directions so that propagation modes for the signals were decoupled into transverse electric (TE) and transverse magnetic (TM) modes (Williams and Rodriguez, 2000;2001d;Williams, and others, 2001a;. Resistivity model construction and results are described in detail in Rodriguez and Williams (2001) for profiles MT1 to MT4 and in Rodriguez and Williams (2002) for profiles MT5 to MT9.…”

Section: Resistivity Modelsmentioning

confidence: 99%

“…In Rodriguez and Williams (2001;, crustal high resistivity (300 to 1,000 ohm-m) was generally attributed to carbonates, intruded rock, plutonic rock, metamorphic rock, or Precambrian basement. Moderately resistive (30 to 300 ohm-m) rocks were inferred to be volcanic and/or clastic sedimentary rocks.…”

Section: Geologic Correlationsmentioning

confidence: 99%

“…Previous investigations of crustal structures that may be related to the genesis of gold deposits along the northwest-striking Battle Mountain-Eureka (BME) and Carlin trends point to the strong gravity gradient along the BME trend (Grauch and others, 1995), and the inferred fault zones under both BME and Carlin gold trends based on variations in the isotope geochemistry of granitoid intrusions (Tosdal and others, 2000). In earlier reports (Rodriguez and Williams, 2001; we inferred a major northwest-trending crustal fault zone along the BME trend based on data from an older MT data acquisition system that did not have the vertical magnetic field needed to resolve the 90 o ambiguity in electrical strike directions inherent with principal impedance directions. In 2004, as part of a different survey (Williams and Rodriguez, 2005), key stations were reoccupied that had been previously used to define the major northwest-trending inferred crustal fault zone along the BME trend.…”

Section: Geologic Correlationsmentioning

confidence: 99%

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Major Crustal Fault Zone Trends and Their Relation to Mineral Belts in the North-Central Great Basin, Nevada

Rodriguez¹,

Sampson²,

Williams³

2007

Open-File Report

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The Great Basin physiographic province covers a large part of the western United States and contains one of the world's leading gold-producing areas, the Carlin Trend. In the Great Basin, many sedimentary-rock-hosted disseminated gold deposits occur along such linear mineral-occurrence trends. The distribution and genesis of these deposits is not fully understood, but most models indicate that regional tectonic structures play an important role in their spatial distribution. Over 100 magnetotelluric (MT) soundings were acquired between 1994 and 2001 by the U.S. Geological Survey to investigate crustal structures that may underlie the linear trends in north-central Nevada. MT sounding data were used to map changes in electrical resistivity as a function of depth that are related to subsurface lithologic and structural variations. Two-dimensional (2-D) resistivity modeling of the MT data reveals primarily northerly and northeasterly trending narrow 2-D conductors (1 to 30 ohm-m) extending to mid-crustal depths (5-20 km) that are interpreted to be major crustal fault zones. There are also a few westerly and northwesterly trending 2-D conductors. However, the great majority of the inferred crustal fault zones mapped using MT are perpendicular or oblique to the generally accepted trends. The correlation of strike of three crustal fault zones with the strike of the Carlin and Getchell trends and the Alligator Ridge district suggests they may have been the root fluid flow pathways that fed faults and fracture networks at shallower levels where gold precipitated in favorable host rocks. The abundant northeasterly crustal structures that do not correlate with the major trends may be structures that are open to fluid flow at the present time.

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Crustal structure of the Ruby Mountains and southern Carlin Trend region, Nevada, from magnetotelluric data

Wannamaker

Doerner

2002

Ore Geology Reviews

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Deep regional resistivity structure across the Battle Mountain-Eureka and Carlin trends, north-central Nevada

Cited by 8 publications

References 19 publications

Attenuation tomography of the western United States from ambient seismic noise

Attenuation tomography of the western United States from ambient seismic noise

Major Crustal Fault Zone Trends and Their Relation to Mineral Belts in the North-Central Great Basin, Nevada

Crustal structure of the Ruby Mountains and southern Carlin Trend region, Nevada, from magnetotelluric data

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