Publications
Filter Total Items: 3018
Origin of comb layering and orbicular structure, Sierra Nevada Batholith, California: Reply Origin of comb layering and orbicular structure, Sierra Nevada Batholith, California: Reply
No abstract available.
Authors
James G. Moore, J. P. Lockwood
Apollo 11 and 12 mare basalts and gabbros: Classification, compositional variations, and possible petrogenetic relations Apollo 11 and 12 mare basalts and gabbros: Classification, compositional variations, and possible petrogenetic relations
On the basis of composition, it is possible to distinguish three major groups of Apollo 12 basaltic rocks: olivine-pigeonite basalts and gabbros, ilmenite-bearing basalts and gabbros, and feldspathic basalts. Two major groups of Apollo 11 basalts are also distinguishable: ophitic ilmenite basalts and intersertal ilmenite basalts. Compositional variations between samples within groups are...
Authors
Odette B. James, Thomas L. Wright
Volcanic stratigraphy of the Quaternary rhyolite plateau in Yellowstone National Park Volcanic stratigraphy of the Quaternary rhyolite plateau in Yellowstone National Park
The volcanic sequence of the Quaternary Yellowstone plateau consists of rhyolites and basalts representing three volcanic cycles. The major events of each cycle were eruption of a voluminous ash-flow sheet and formation of a large collapse caldera. Lesser events of each cycle were eruption of precaldera and postcaldera rhyolitic lava flows and marginal basaltic lavas. The three major ash...
Authors
Robert L. Christiansen, H. Richard Blank
Preliminary geologic map of the eastern Solomon and southeastern Bendeleben quadrangles, eastern Seward Peninsula, Alaska Preliminary geologic map of the eastern Solomon and southeastern Bendeleben quadrangles, eastern Seward Peninsula, Alaska
No abstract available.
Authors
Thomas Miller, Donald Grybeck, Raymond Elliott, Travis Hudson
Investigations at active volcanoes Investigations at active volcanoes
The field of volcanology has expanded greatly in the years 1967–1970, and work on active volcanoes has kept pace with this expansion. I have restricted this summary and the accompanying bibliography to studies by U.S.‐based investigators of active or potentially active volcanoes. I have been immeasurably aided in writing this summary by communications from R. Citron of the Smithsonian...
Authors
Thomas L. Wright
Origin of the differentiated and hybrid lavas of Kilauea Volcano, Hawaii Origin of the differentiated and hybrid lavas of Kilauea Volcano, Hawaii
Kilauea Volcano has erupted lava from its summit caldera and from two rift zones that extend from the summit towards the east and south-west. Lavas erupted from the summit of the volcano differ from each other principally in their content of olivine and define lines of ‘olivine control’ on magnesia variation diagrams. Lavas erupted on the rift zones may be similar in composition to the...
Authors
Thomas L. Wright, Richard S. Fiske
Volcanology, geochemistry, and petrology: U.S. National Report, 1967-1971, Fifteenth General Assembly, IUGG: Investigations at active volcanoes Volcanology, geochemistry, and petrology: U.S. National Report, 1967-1971, Fifteenth General Assembly, IUGG: Investigations at active volcanoes
The field of volcanology has expanded greatly in the years 1967–1970, and work on active volcanoes has kept pace with this expansion. I have restricted this summary and the accompanying bibliography to studies by U.S.‐based investigators of active or potentially active volcanoes. I have been immeasurably aided in writing this summary by communications from R. Citron of the Smithsonian...
Authors
Thomas L. Wright