Fracture fillings and intrusive pyroclasts, Inyo Domes, California

Journal Article · Tue May 10 04:00:00 EDT 1988 · J. Geophys. Res.; (United States)

DOI:https://doi.org/10.1029/JB093iB05p04335· OSTI ID:7194310

Heiken, G; Wohletz, K; Eichelberger, J

Fractures containing juvenile magmatic pyroclasts were encountered during drilling into a 600-year-old feeder dike beneath the Inyo Domes chain, California. The Inyo Domes consist of a north-south trending, 10-km-long chain of domes, rhyolitic tuff rings, and phreatic craters. Boreholes were cored through the 51-m-diameter conduit of Obsidian Dome, the largest of the Inyo Domes, and through an unvented portion of the intrusion (dike) 1 km to the south. Pyroclast-bearing fractures were intersected in both holes: (1) 7- to 40-cm-thick fractures in welded basaltic scoria and quartz monzonite country rock are adjacent to the conduit at depths of 400--411 m and 492--533 m; they contain gray, clastic deposits, which show truncated cross bedding and convolute bedding; (2) adjacent to the dike, massive fracture fillings occur at depths of 289--302 m (129 m east of the dike) and 366--384 m (95--87 m east of the dike).

• Research Organization: Earth and Space Science Division, Los Alamos National Laboratory, Los Alamos, New Mexico
• OSTI ID: 7194310
• Journal Information: J. Geophys. Res.; (United States), Journal Name: J. Geophys. Res.; (United States) Vol. 93:B5; ISSN JGREA
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
580202* -- Geophysics-- Volcanology-- (1980-1989)
AGE ESTIMATION
BASALT
BOREHOLES
CALIFORNIA
CAVITIES
CHALCOGENIDES
DIKES
ENERGY SYSTEMS
FEDERAL REGION IX
GEOLOGIC FRACTURES
GEOLOGIC STRUCTURES
GEOTHERMAL SYSTEMS
GLASS
HYDROTHERMAL SYSTEMS
IGNEOUS ROCKS
LITHOLOGY
LONG VALLEY
MAGMA
MINERALS
NORTH AMERICA
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
QUARTZ
ROCKS
SILICON COMPOUNDS
SILICON OXIDES
USA
VOLCANIC ROCKS
VOLCANOES