Aeromagnetic map of Yucca Mountain and surrounding regions, southwest Nevada

Kane, Martin; Bracken, Robert E.

doi:10.3133/ofr83616

Cited by 16 publications

(29 citation statements)

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“…6 and 7). Gravity (Snyder and Carr, 1984) and aeromagnetic patterns (Kane and Bracken, 1983), as well as two drill holes (Carr, 1988) (Fig. 7), support these conclusions, as do geologic maps (Swadley and Carr, 1986;Byers and others, 1976a;Carr, 1988, Fig.…”

Section: Zones 1 and 2 In The Kawich-greenwater Riftsupporting

confidence: 70%

“…A general absence of strong anomalies on aeromagnetic surveys (Kane and Bracken, 1983;U.S. Geological Survey, 1978) indicates that, except for scattered small areas of basalt, strongly magnetic volcanic rocks are thin or absent in the Amargosa Valley south of the southern boundary of the Nevada Test Site (Fig.…”

Section: Regional Settingmentioning

confidence: 96%

“…8). A strong negative aeromagnetic anomaly (Kane and Bracken, 1983) 2 km south of Lathrop Wells (Fig. 8) versely magnetized basalt.…”

Section: Ti Va Canyonmentioning

confidence: 97%

“…The Big Dune basalt center, also called the Lathrop Wells cone (Vaniman and others, 1982), is situated at the southern end of a prominent northeast-striking aeromagnetic lineament (Fig. 8) (Kane and Bracken, 1983). Near the middle of the lineament is a coinciding fault that has had Quaternary movement (Swadley and others, 1984).…”

Section: Ti Va Canyonmentioning

confidence: 97%

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Chapter 13: Styles of extension in the Nevada Test Site region, southern Walker Lane Belt; An integration of volcano-tectonic and detachment fault models

Carr

1990

Geological Society of America Memoirs

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Detailed geological information, supported by geophysical data and drill holes, indicates that several deformational styles characterize the Walker Lane Belt of the south-central Great Basin and Nevada Test Site region.The region is split by a north-trending major volcano-tectonic rift that includes several large calderas and is filled with more than 4 km of Miocene volcanic rocks. The rift lies in a large right-step in the Walker Lane Belt and separates areas to the west containing recognized detachment-style faults and metamorphic rocks from adjoining terrain on the east that contains no recognized major detachment faults or exposures of metamorphosed rocks.The volcano-tectonic trough was most active from about 16 to 10 Ma. The style and timing of Cenozoic faulting is different east and west of the rift, and well-dated volcanic sequences show that the principal faulting events occurred at different times and rates within adjacent structural domains. This variability suggests that no single tectonic process produced the Cenozoic structure of the region. Normal faulting east of the rift may have been controlled in part by extension accommodated by Mesozoic thrust faults.It is proposed that the volcanic rift represents a pull-apart at a right-step in the Walker Lane Belt and that the rift was the headwall or breakaway zone for detachment faulting to the west. In this model, extensional faults of Miocene age within and immediately east of the rift are largely gravitational responses to magmatism, rifting, and volcano-tectonic collapse.

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Section: Zones 1 and 2 In The Kawich-greenwater Riftsupporting

confidence: 70%

Section: Regional Settingmentioning

confidence: 96%

“…8). A strong negative aeromagnetic anomaly (Kane and Bracken, 1983) 2 km south of Lathrop Wells (Fig. 8) versely magnetized basalt.…”

Section: Ti Va Canyonmentioning

confidence: 97%

Section: Ti Va Canyonmentioning

confidence: 97%

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Chapter 13: Styles of extension in the Nevada Test Site region, southern Walker Lane Belt; An integration of volcano-tectonic and detachment fault models

Carr

1990

Geological Society of America Memoirs

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“…These models are applied to the probability of volcanic eruption occurring in the Yucca Mountain region (YMR), Nevada. Locations of aeromagnetic anomalies (stars) from Kane and Bracken [1983] and Langenheim et at. First, volcanic eruptions, such as the formation of a new cinder cone, are discrete in time and space.…”

Section: Introductionmentioning

confidence: 99%

Three nonhomogeneous Poisson models for the probability of basaltic volcanism: Application to the Yucca Mountain region, Nevada

Connor¹,

Hill²

1995

J. Geophys. Res.

163

153

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The distribution and timing of areal basaltic volcanism are modeled using three nonhomogeneous methods: spatio‐temporal nearest neighbor, kernel, and nearest‐neighbor kernel. These models give nonparametric estimates of spatial or spatio‐temporal recurrence rate based on the positions and ages of cinder cones and related vent structures and can account for migration and shifts in locus, volcano clustering, and development of regional vent alignments. The three methods are advantageous because (1) recurrence rate and probability maps can be made, facilitating comparison with other geological information; (2) the need to define areas or zones of volcanic activity, required in homogeneous approaches, is eliminated; and (3) the impact of uncertainty in the timing and distribution of individual events is particularly easy to assess. The models are applied to the Yucca Mountain region (YMR), Nevada, the site of a proposed high‐level radioactive waste repository. Application of the Hopkins F test, Clark‐Evans test, and K function indicates volcanoes cluster in the YMR at the >95% confidence level. Weighted‐centroid cluster analysis indicates that Plio‐Quaternary volcanoes are distributed in four clusters: three of these clusters include cinder cones formed <1 Ma. Probability of disruption within the 8 km2 area of the proposed repository by formation of a new basaltic vent is calculated to be between 1 × 10−4 and 5 × 10−4 in 104 years (the kernel and nearest‐neighbor kernel methods give a maximum probability of 5 × 10−4 in 104 years), assuming regional recurrence rates of 5–10 volcanoes/m.y. An additional finding, illustrating the strength of nonhomogeneous methods, is that maps of the probability of volcanic eruption for the YMR indicate the proposed repository lies on a steep probability gradient: volcanism recurrence rate varies by more than 2 orders of magnitude within 20 km. Insight into this spatial scale of probability variation is a distinct benefit of application of these methods to hazard analysis in areal volcanic fields.

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Magnetic surveys help reassess volcanic hazards at Yucca Mountain, Nevada

et al. 1997

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Natural disasters like volcanic eruptions occur infrequently, but if they occur near nuclear power plants or high‐level radioactive waste repositories, local and global communities can be threatened. Ideally, such facilities should be constructed only where geologic risk is very low. Estimating the probabilities of such events requires a comprehensive understanding of site geology and the geologic processes operating in the site region on timescales of 104 to 107 years. In light of these requirements, geologists and geophysicists must continually improve techniques for site characterization.

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Aeromagnetic map of Yucca Mountain and surrounding regions, southwest Nevada

Cited by 16 publications

References 0 publications

Chapter 13: Styles of extension in the Nevada Test Site region, southern Walker Lane Belt; An integration of volcano-tectonic and detachment fault models

Chapter 13: Styles of extension in the Nevada Test Site region, southern Walker Lane Belt; An integration of volcano-tectonic and detachment fault models

Three nonhomogeneous Poisson models for the probability of basaltic volcanism: Application to the Yucca Mountain region, Nevada

Magnetic surveys help reassess volcanic hazards at Yucca Mountain, Nevada

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