Publications
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Mg/Mn partitioning as a test for equilibrium between coexisting Fe-Ti oxides Mg/Mn partitioning as a test for equilibrium between coexisting Fe-Ti oxides
Partitioning of Mg and Mn between titanomagnetite and ferrian ilmenite of volcanic rocks provides a test for equilibrium between coexisting phases. A plot of log(Mg/Mn)-, vs. log(Mg/Mn),, for 213 homogeneous oxide pairs from volcanic rocks yields a straight line over more than two orders of magnitude variation in Mg/Mn. Analyses that plot within reasonable limits of analytical precision...
Authors
Charles R. Bacon, M.M. Hirschmann
Historical unrest at large calderas of the world Historical unrest at large calderas of the world
No abstract available.
Authors
Christopher G. Newhall, Daniel Dzurisin
Compositional evolution of the zoned calcalkaline magma chamber of Mount Mazama, Crater Lake, Oregon Compositional evolution of the zoned calcalkaline magma chamber of Mount Mazama, Crater Lake, Oregon
The climactic eruption of Mount Mazama has long been recognized as a classic example of rapid eruption of a substantial fraction of a zoned magma body. Increased knowledge of eruptive history and new chemical analyses of ∼350 wholerock and glass samples of the climactic ejecta, preclimactic rhyodacite flows and their inclusions, postcaldera lavas, and lavas of nearby monogenetic vents...
Authors
C. R. Bacon, T. H. Druitt
Diskette version of analytical results, and sample locality map for rock samples from the Iditarod quadrangle, Alaska Diskette version of analytical results, and sample locality map for rock samples from the Iditarod quadrangle, Alaska
No abstract available.
Authors
Robert G. McGimsey, Marti L. Miller, B. F. Arbogast
QED QED
No abstract available.
Regional earthquake hazards assessments Regional earthquake hazards assessments
No abstract available.
Authors
Henry Spall
Hydrologic data for computation of sediment discharge: Toutle and North Fork Toutle Rivers near Mount St. Helens, Washington, water years 1980-84 Hydrologic data for computation of sediment discharge: Toutle and North Fork Toutle Rivers near Mount St. Helens, Washington, water years 1980-84
Immediately after the devastating May 18, 1980, eruption of Mount St. Helens, a program was initiated by the U.S. Geological Survey to study the streamflow and sediment characteristics of streams impacted by the eruption. Some of the data gathered in that program are presented in this report. Data are presented for two key sites in the Toutle River basin: North Fork Toutle River near Kid...
Authors
Dallas Childers, Stephen E. Hammond, William P. Johnson
No evidence for post-icesheet cirque glaciation in New England No evidence for post-icesheet cirque glaciation in New England
No abstract available.
Authors
Richard B. Waitt, P. Thompson Davis
A water-resources appraisal of the Mount Shasta area in northern California, 1985 A water-resources appraisal of the Mount Shasta area in northern California, 1985
Present Mount Shasta, California, area hydrologic characteristics were documented to compare future changes due to land use or volcanic activity. Lower flanks of Mount Shasta consist of broad aprons of pyroclastic-flow, debris flow, and fluvial deposits, with incised channels on upper parts of the mountain. Data include glacial areas and volumes, streamflow, sediment concentrations...
Authors
J. C. Blodgett, K.R. Poeschel, J.L. Thornton