skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Constraints on magma ascent, emplacement, and eruption: geochemical and mineralogical data from drill-core samples at Obsidian dome, Inyo chain, California

Abstract

Systematic chemical and mineralogical variability occurs in samples from drill holes through Obsidian dome, the conduit to the dome, and a nearby associated feeder dike. The drill-hole samples from the margins of the conduit and most of the lower part of the dome are high-Ba, low-silica rhyolites; they contain two populations of phenocrysts and represent commingled magmas, whereas samples from the dike and upper parts of the dome are low-Ba, higher silica rhyolites that do not reflect commingled magmas. Samples from the center of the conduit are low-Ba, higher silica rhyolites that are only slightly mixed. A major part of the variability within the drill-core samples of the dome and conduit reflects the juxtaposition and commingling of two distinct magmas during their passage through the conduit.

Authors:
; ;
Publication Date:
Research Org.:
Michigan State Univ., East Lansing (USA)
OSTI Identifier:
5276172
DOE Contract Number:  
FG02-85ER13321
Resource Type:
Journal Article
Resource Relation:
Journal Name: Geology; (United States); Journal Volume: 15:5
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; CALIFORNIA; VOLCANIC REGIONS; GEOCHEMISTRY; MINERALOGY; CHEMICAL ANALYSIS; DIKES; DRILL CORES; GEOLOGIC HISTORY; MAGMA; METALS; MIXING; OXIDES; TRACE AMOUNTS; VARIATIONS; VOLCANISM; CHALCOGENIDES; CHEMISTRY; ELEMENTS; FEDERAL REGION IX; GEOLOGIC STRUCTURES; NORTH AMERICA; OXYGEN COMPOUNDS; USA; 580202* - Geophysics- Volcanology- (1980-1989); 580400 - Geochemistry- (-1989)

Citation Formats

Vogel, T.A., Younker, L.W., and Schuraytz, B.C. Constraints on magma ascent, emplacement, and eruption: geochemical and mineralogical data from drill-core samples at Obsidian dome, Inyo chain, California. United States: N. p., 1987. Web. doi:10.1130/0091-7613(1987)15<405:COMAEA>2.0.CO;2.
Vogel, T.A., Younker, L.W., & Schuraytz, B.C. Constraints on magma ascent, emplacement, and eruption: geochemical and mineralogical data from drill-core samples at Obsidian dome, Inyo chain, California. United States. doi:10.1130/0091-7613(1987)15<405:COMAEA>2.0.CO;2.
Vogel, T.A., Younker, L.W., and Schuraytz, B.C. Fri . "Constraints on magma ascent, emplacement, and eruption: geochemical and mineralogical data from drill-core samples at Obsidian dome, Inyo chain, California". United States. doi:10.1130/0091-7613(1987)15<405:COMAEA>2.0.CO;2.
@article{osti_5276172,
title = {Constraints on magma ascent, emplacement, and eruption: geochemical and mineralogical data from drill-core samples at Obsidian dome, Inyo chain, California},
author = {Vogel, T.A. and Younker, L.W. and Schuraytz, B.C.},
abstractNote = {Systematic chemical and mineralogical variability occurs in samples from drill holes through Obsidian dome, the conduit to the dome, and a nearby associated feeder dike. The drill-hole samples from the margins of the conduit and most of the lower part of the dome are high-Ba, low-silica rhyolites; they contain two populations of phenocrysts and represent commingled magmas, whereas samples from the dike and upper parts of the dome are low-Ba, higher silica rhyolites that do not reflect commingled magmas. Samples from the center of the conduit are low-Ba, higher silica rhyolites that are only slightly mixed. A major part of the variability within the drill-core samples of the dome and conduit reflects the juxtaposition and commingling of two distinct magmas during their passage through the conduit.},
doi = {10.1130/0091-7613(1987)15<405:COMAEA>2.0.CO;2},
journal = {Geology; (United States)},
number = ,
volume = 15:5,
place = {United States},
year = {Fri May 01 00:00:00 EDT 1987},
month = {Fri May 01 00:00:00 EDT 1987}
}