Structure and stratigraphy beneath a young phreatic vent: South Inyo Crater, Long Valley caldera, California
Abstract
An 861-m-long hole has been cored on a slanted trajectory that passed directly beneath South Inyo Crater in the west moat of Long valley Caldera, California. The purpose of the hole was to investigate the magmatic behavior that led to surface deformation and phreatic activity during the 600-year-old eruption of the Inyo vent chain. The hole was sited 216 m southwest of the crater, passed beneath its center at a depth of 566 m, and terminated 79 m northeast of the crater center at a depth of 810 m. Metamorphic basement was encountered at a depth of 779 m. The volcanic and sedimentary sequence consists solely of post-Bishop Tuff caldera fill, including 319 m of moat basalt and 342 m of early rhyolite, and is nearly 900 m thinner than in a Unocal Corporation well 900 m to the southeast. Apparently, a major fault lies between the two holes and forms part of the western structural boundary of the caldera, 3--4 km inboard of its topographic boundary. Breccia zones that intrude the caldera fill were intersected at 12.0--9.3 m and 1.2--0.8 m SW and 8.5--25.1 m NE of the crater center.
- Authors:
- Publication Date:
- Research Org.:
- Sandia National Laboratories, Albuquerque, New Mexico
- OSTI Identifier:
- 6392555
- Resource Type:
- Journal Article
- Journal Name:
- J. Geophys. Res.; (United States)
- Additional Journal Information:
- Journal Volume: 93:B11
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 58 GEOSCIENCES; LONG VALLEY; CALDERAS; GEOLOGIC STRUCTURES; BASEMENT ROCK; MAGMATIC WATER; METAMORPHIC ROCKS; SEDIMENTARY ROCKS; STRATIGRAPHY; TECTONICS; VOLCANIC ROCKS; VOLCANOES; CALIFORNIA; FEDERAL REGION IX; GEOLOGY; GROUND WATER; HYDROGEN COMPOUNDS; IGNEOUS ROCKS; NORTH AMERICA; OXYGEN COMPOUNDS; ROCKS; USA; WATER; 580202* - Geophysics- Volcanology- (1980-1989)
Citation Formats
Eichelberger, J C, Vogel, T A, Younker, L W, Dan Miller, C, Heiken, G H, and Wohletz, K H. Structure and stratigraphy beneath a young phreatic vent: South Inyo Crater, Long Valley caldera, California. United States: N. p., 1988.
Web. doi:10.1029/JB093iB11p13208.
Eichelberger, J C, Vogel, T A, Younker, L W, Dan Miller, C, Heiken, G H, & Wohletz, K H. Structure and stratigraphy beneath a young phreatic vent: South Inyo Crater, Long Valley caldera, California. United States. https://doi.org/10.1029/JB093iB11p13208
Eichelberger, J C, Vogel, T A, Younker, L W, Dan Miller, C, Heiken, G H, and Wohletz, K H. 1988.
"Structure and stratigraphy beneath a young phreatic vent: South Inyo Crater, Long Valley caldera, California". United States. https://doi.org/10.1029/JB093iB11p13208.
@article{osti_6392555,
title = {Structure and stratigraphy beneath a young phreatic vent: South Inyo Crater, Long Valley caldera, California},
author = {Eichelberger, J C and Vogel, T A and Younker, L W and Dan Miller, C and Heiken, G H and Wohletz, K H},
abstractNote = {An 861-m-long hole has been cored on a slanted trajectory that passed directly beneath South Inyo Crater in the west moat of Long valley Caldera, California. The purpose of the hole was to investigate the magmatic behavior that led to surface deformation and phreatic activity during the 600-year-old eruption of the Inyo vent chain. The hole was sited 216 m southwest of the crater, passed beneath its center at a depth of 566 m, and terminated 79 m northeast of the crater center at a depth of 810 m. Metamorphic basement was encountered at a depth of 779 m. The volcanic and sedimentary sequence consists solely of post-Bishop Tuff caldera fill, including 319 m of moat basalt and 342 m of early rhyolite, and is nearly 900 m thinner than in a Unocal Corporation well 900 m to the southeast. Apparently, a major fault lies between the two holes and forms part of the western structural boundary of the caldera, 3--4 km inboard of its topographic boundary. Breccia zones that intrude the caldera fill were intersected at 12.0--9.3 m and 1.2--0.8 m SW and 8.5--25.1 m NE of the crater center.},
doi = {10.1029/JB093iB11p13208},
url = {https://www.osti.gov/biblio/6392555},
journal = {J. Geophys. Res.; (United States)},
number = ,
volume = 93:B11,
place = {United States},
year = {Thu Nov 10 00:00:00 EST 1988},
month = {Thu Nov 10 00:00:00 EST 1988}
}