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| South Mono Dome | |
|---|---|
| Name | South Mono Dome |
| Elevation | 11,256 ft (3,430 m) |
| Range | Sierra Nevada |
| Location | Mono County, California, United States |
| Topo | USGS Mount Morrison |
| Type | Lava dome |
| Coordinates | 37°52′N 119°03′W |
South Mono Dome South Mono Dome is a prominent volcanic lava dome on the eastern slope of the Sierra Nevada in Mono County, California, United States. It rises above the western shore of Mono Lake and lies within the Inyo National Forest near the Ansel Adams Wilderness and Yosemite National Park boundary. The dome is part of the Mono–Inyo Craters volcanic chain, situated north of Mount Dana and south of the Devils Postpile National Monument region.
South Mono Dome stands east of the main crest of the Sierra Nevada near the Long Valley Caldera and northwest of Mammoth Lakes, California. The dome overlooks Mono Lake and sits along routes connecting U.S. Route 395 (California) to trailheads leading toward June Lake and Convict Lake. It is sited within Mono Basin National Forest Scenic Area and is proximal to Panum Crater, Negit Island, and the Mono Lake Tufa State Natural Reserve. Nearby landmarks include Devils Postpile, Minaret Summit, Mount Lyell, and the John Muir Trail corridor. The location lies in the traditional territory of the Northern Paiute and Miwok peoples and within lands administered by the United States Forest Service.
South Mono Dome is part of the late Pleistocene to Holocene volcanic activity associated with the Mono–Inyo Craters chain and the Long Valley Caldera magmatic system. Its composition is dominated by rhyolite, similar to domes such as Panum Crater and features comparable to domes in the Black Rock Desert volcanic field and the Coso Volcanic Field. The dome formed through effusive eruptions that extruded high-viscosity lava, similar to processes documented at Mount St. Helens (pre-1980 dome), Lassen Peak, and Mount Mazama (crater-forming eruptions). Petrologic studies reference magma evolution common to volcanic centers like Crater Lake National Park and Yellowstone Caldera, with silicic differentiation and volatile exsolution analogous to eruptions at Taupo Volcanic Zone and Nevado del Ruiz.
Geochemical analyses compare South Mono Dome’s rhyolite to samples from Mount Hood and Medicine Lake Volcano, showing trace-element affinities with the Sierra Nevada Batholith. Structural controls include regional faulting such as the Owens Valley Fault and interaction with the extensional regime influencing the Walker Lane Belt. Seismicity recorded by networks like the USGS and the California Integrated Seismic Network has illuminated episodic unrest in the Mono–Inyo chain, linking the dome to broader tectono-volcanic systems including the San Andreas Fault and the Eastern California Shear Zone.
The dome’s summit elevation is approximately 11,256 feet (3,430 meters) with steep flanks and blocky, rubbly outcrops characteristic of rhyolitic domes found in regions like Craters of the Moon National Monument and Stromboli (lava dome analogues). Surface features include lava lobes, obsidian and pumice fragments, and jointed rhyolite similar to exposures at Obsidian Dome and Glass Mountain, California. Morphology echoes features observed at Mount Bachelor and Newberry Volcano with talus slopes, fumarolic alteration in proximal areas, and localized hydrothermal alteration comparable to sites at Hot Creek Geological Site and Mammoth Mountain.
The dome influences local drainage into Rush Creek and the Mono Lake basin, affecting sediment transport and lacustrine deposits like those preserved around Gavin Canyon and Lee Vining Creek. Erosional processes are akin to those shaping features in the Inyo Mountains and White Mountains.
South Mono Dome sits within a high-elevation, cold semi-arid zone influenced by the Great Basin and Pacific storm tracks affecting the Sierra Nevada. Vegetation zones include alpine and subalpine communities similar to those in Yosemite National Park, featuring species associated with Jeffrey pine and Lodgepole pine belts and montane meadows akin to those at Convict Lake and June Lake basins. Faunal assemblages mirror those in Inyo National Forest and include mammals and birds found in Ansel Adams Wilderness and Sierra Nevada habitats.
Snowpack and runoff patterns at the dome contribute to hydrologic cycles monitored by agencies such as the National Weather Service and California Department of Water Resources, influencing Mono Lake salinity and shorelines, issues addressed by litigations and management efforts involving Audubon Society and California State Water Resources Control Board. Climatic variability links to Pacific phenomena like the El Niño–Southern Oscillation and longer-term patterns observed by the National Oceanic and Atmospheric Administration.
Indigenous use of the Mono Basin by the Northern Paiute and Mono Lake Kutzadika'a peoples included resource use and spiritual associations with features around Mono Lake and domes resembling South Mono Dome. Euro-American exploration and mapping by expeditions linked to figures such as John Muir and surveyors working for the U.S. Geological Survey documented volcanic landforms in the 19th century alongside mining activities in Bodie, California and settlement at Lee Vining, California. Conservation actions in the 20th century involved organizations like the Sierra Club, Mono Lake Committee, and federal entities including the National Park Service and U.S. Forest Service.
Scientific investigations have drawn researchers from institutions such as California Institute of Technology, Stanford University, University of California, Berkeley, Scripps Institution of Oceanography, and University of California, Los Angeles to study volcanic hazards, petrology, and hydrology. Legal and environmental campaigns involving the People of the State of California and courts such as the California Supreme Court influenced water management affecting the Mono Basin and its cultural landscapes.
Access to the dome is commonly via trail systems and forest roads managed by the U.S. Forest Service with trailheads accessed from U.S. Route 395 (California), Tioga Pass Road, and roads serving June Lake Loop. Outdoor activities include hiking, geology-oriented field trips, birdwatching promoted by Mono Lake Committee and Audubon Society, and photography popularized by visitors influenced by photographers such as Ansel Adams and Galen Rowell. Nearby recreational facilities and services in Mammoth Lakes, California, Lee Vining, California, and June Lake provide staging points, while wilderness regulations of the Ansel Adams Wilderness and permitting overseen by the U.S. Forest Service govern backcountry use.
Visitors benefit from interpretive resources provided by entities like the Mono Basin Scenic Area Visitor Center, educational programs by California State Parks, and research shared through academic outlets at the Museum of Vertebrate Zoology and the Museum of Paleontology at University of California, Berkeley. Safety advisories and volcanic hazard information are coordinated with the USGS and local emergency services such as the Mono County Sheriff's Office.
Category:Volcanoes of Mono County, California