Lunar Crater volcanic field

Lunar Crater volcanic field
Name	Lunar Crater volcanic field
Elevation m	2000
Location	Nye County, Nevada, United States
Coordinates	38.749,-116.271
Type	volcanic field, maar, cinder cone, shield
Last eruption	Pleistocene–Holocene (disputed)

Lunar Crater volcanic field is a volcanic field in Nye County, Nevada in the United States within the Bureau of Land Management Black Rock Desert–High Rock Canyon region. The field comprises maars, scoria cones, and silicic and basaltic lava flows that have been the focus of multidisciplinary studies by researchers from institutions such as the United States Geological Survey, the Smithsonian Institution, and universities including University of Nevada, Reno and University of California, Berkeley. Its geologic setting near the Great Basin and the Walker Lane makes it relevant to investigations of Basin and Range extension, Yellowstone hotspot debates, and western North America magmatism.

Overview

The volcanic field occupies a cratered basin informally named Lunar Crater and lies along transportation routes such as U.S. Route 6 and near Tonopah, Nevada and Ely, Nevada, placing it within reach of field campaigns by teams from Nevada Bureau of Mines and Geology and the National Park Service partners. Seasonal access and land management intersect with Bureau of Land Management policies and local Nye County planning. The area has been used for analog studies by NASA, linking it to programs at the Jet Propulsion Laboratory and training missions associated with the Apollo program heritage.

Geology and volcanic features

The field features multiple maar craters and scoria cones underlain by a complex of sedimentary rocks of the Mesozoic and Cenozoic eras and intruded by basaltic to rhyoliteic volcanics. Geologic mapping has been conducted by staff affiliated with the United States Geological Survey and state surveys, correlating ejecta, tephra, and lava units with regional stratigraphy used in Nevada tectonic syntheses. The distribution of vents has been analyzed in studies by researchers at University of California, Santa Barbara and Stanford University to assess links to faults such as those within the Walker Lane shear zone and the broader Basin and Range Province.

Eruption history and chronology

Radiometric dating techniques including K–Ar dating, Ar–Ar dating, and tephrochronology by teams from Caltech and the Smithsonian Institution have yielded ages spanning late Pleistocene to possible Holocene eruptions, with debates over the youngest activity noted in publications from University of Nevada, Reno. Paleomagnetic studies and stratigraphic correlations referenced by researchers at Oregon State University and University of Arizona have been used to constrain eruption episodes that contributed scoria and lava flows preserved in the field.

Geomorphology and lava types

The volcanic landforms include explosion-formed maars similar to examples documented at Ambrym and Eifel (comparative studies at University College London), overlapping ʻaʻā and pahoehoe analogs of basaltic flows described in field guides from California Academy of Sciences. Compositional analyses by petrographers at the Smithsonian Institution and geochemists at Scripps Institution of Oceanography indicate a range from basaltic andesite to trachyandesite and localized evolved rift-related silicic compositions; whole-rock geochemistry and mineralogical data have been compared with suites from Cascades and Snake River Plain provinces.

Tectonics and magma sources

Investigations link magma generation to lithospheric processes associated with Basin and Range Province extension, transtensional deformation along the Walker Lane, and possible mantle melt inputs discussed in studies involving North American Plate tectonics. Geochemical signatures reported by teams at Los Alamos National Laboratory and isotope studies from Rutgers University have been invoked to evaluate contributions from depleted mantle, lithospheric mantle metasomatism, and crustal assimilation. Geophysical surveys by the USGS and collaborations with University of Utah researchers have imaged crustal structures that influence ascent pathways.

Volcanic hazards and monitoring

Although eruptions at the field are generally considered infrequent in comparison to active volcanic regions monitored by the National Volcano Early Warning System and the United States Geological Survey, hazard assessments have been produced in coordination with the Nevada Division of Emergency Management and local authorities in Nye County. Studies emphasize tephra dispersal, lava flow emplacement, and vent formation, drawing on hazard models used for Yellowstone National Park and Long Valley Caldera analogs; monitoring leverages regional seismic networks operated by the Incorporated Research Institutions for Seismology and satellite remote sensing programs at NASA.

Human exploration and scientific studies

The site has attracted field teams from universities and federal laboratories for volcanology, geochronology, and planetary analog research linked to personnel from the Jet Propulsion Laboratory and astronauts trained under programs connected to the Apollo program legacy. Geological mapping and sample collections have been curated at repositories such as the Smithsonian Institution National Museum of Natural History and state collections at the Nevada Bureau of Mines and Geology. Interdisciplinary work involving climatologists at National Center for Atmospheric Research and ecologists from University of Nevada, Reno has broadened understanding of post-eruptive soils and biotic recovery.

Category:Volcanic fields of Nevada Category:Maars of the United States