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Explore Search: volcanic rocks

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Mafic and ultramafic xenoliths from volcanic rocks of the western United States

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Palaeomagnetism and potassium-argon ages of volcanic rocks of Ngorongoro caldera, Tanzania

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Tectonic setting of the Tertiary volcanic rocks of the Olympic Peninsula, Washington

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Cenozoic Volcanic Rocks of the Devils Postpile Quadrangle, Eastern Sierra Nevada, California

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Analyses of upper-plate volcanic rocks at Picacho Peak, Pinal County, Arizona

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Tertiary volcanic and intrusive rocks on the Oregon and Washington continental shelf

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Chemical analyses of selected Tertiary and Quaternary volcanic rocks, Cascade Range, Washington

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Collage of USGS Maps.

Geologic map of volcanic rocks in Sevier NE Quadrangle, west-central Utah

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Mobility of uranium and thorium in glassy and crystallized silicic volcanic rocks

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Aeromagnetic anomalies related to remanent magnetism in volcanic rocks, Nevada Test Site

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Lead and strontium isotopes in rocks of the Absaroka volcanic field, Wyoming

Data Release
Collage of images of an earthquake, scientists in flood with instruments, a volcano erupting, and seismic illustration.

Data release for geochronology and geochemistry of volcanic rocks in the Southern Rocky Mountains and Taos Plateau volcanic fields and other Oligocene to Pleistocene volcanic rocks within the southern San Luis Basin and San Juan Mountains, southern Colora

Data Release
Collage of images of an earthquake, scientists in flood with instruments, a volcano erupting, and seismic illustration.

Ar isotope data for volcanic rocks from the northern Harrat Rahat volcanic field and surrounding area, Kingdom of Saudi Arabia

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Petrology and geochronology of metamorphosed volcanic rocks and a middle Cretaceous volcanic neck in the east-central Sierra Nevada, California

Center News
Four grayscale images of slices of angular crystals with bright rims and darker interiors, surrounded by flecks of light gray crystal fragments like confetti. Some of the crystals have bright white patches where inclusions exist, and some have dark cracks running through them. Colored text and dots show where chemical analyses were conducted with an electron beam

New study reveals the deep roots of early eruptions in the Clear Lake Volcanic Field

Charts or Graphs
Map of southeastern Idaho showing volcanic rocks related to the Yellowstone hotspot.

Volcanic rocks in SE Idaho that are related to the Yellowstone hotspot
Data Release
Collage of images of an earthquake, scientists in flood with instruments, a volcano erupting, and seismic illustration.

Isotopic compositions (Sr, Nd, Hf, Pb) of Quaternary volcanic rocks of northern Harrat Rahat, Kingdom of Saudi Arabia

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Geochemical database for volcanic rocks of the western Cascades, Washington, Oregon, and California

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Evidence of crustal contamination, sediment, and fluid components in the campanian volcanic rocks

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A Holocene paleosecular variation from 14C-dated volcanic rocks in western North America

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Petrochemistry of late miocene peraluminous silicic volcanic rocks from the Morococala field, Bolivia

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Paleomagnetism of Middle Tertiary volcanic rocks from the Western Cascade Series, northern California

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Selenium content of some volcanic rocks from western United States and Hawaiian Islands

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Chemical analyses of tertiary volcanic rocks, central San Juan caldera complex, southwestern Colorado

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Modal analyses of selected Tertiary volcanic rocks from Nye and Lincoln counties, Nevada

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Are hydrocarbon source rocks buried beneath volcanic flows in the southern Washington Cascades?

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High-resolution 40Ar 39Ar chronology of Oligocene volcanic rocks, San Juan Mountains, Colorado

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Identification of kaolins and associated minerals in altered volcanic rocks by infrared spectroscopy

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Lead isotopes in volcanic rocks and possible ocean-floor thrusting beneath island arcs

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Age and chemistry of tertiary volcanic rocks in north-central Arizona and relation of the rocks to the Colorado Plateaus

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