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Stages in the P-T path of ascending basalt magma: an example from San Quintin, Baja California

Late Pleistocene or Recent lavas from San Quintin, Baja California are basanitoids and alkali basalts. The surface quench temperatures of the lavas average 1 005° C with log fO2fO2=−11.4, as deduced from the groundmass Fe-Ti oxides. Spinel lherzolite xenoliths and megacrysts of augite and andesine have been found in lava flows and cinder deposits. Using analytical data on the rocks and minerals an
Authors
Charles R. Bacon

Flow of lava into the sea, 1969–1971, Kilauea Volcano, Hawaii

Lava from the Mauna Ulu eruption on Kilauea Volcano entered the sea on the south coast of the Island of Hawaii three times from 1969 to 1971. Two of these flows were investigated underwater by divers, one while lava was actively flowing.The June 1969 flow entered the sea as a narrow flow of aa. Below sea level, the flow maintained continuity and flowed at least several hundred meters to a depth be
Authors
James G. Moore, R. L. Phillips, R.W. Grigg, D. W. Peterson, Don Swanson

Origin of Comb Layering and Orbicular Structure, Sierra Nevada Batholith, California

A new descriptive term, comb layering, is proposed to replace the informal term Willow Lake-type layering, first introduced by Poldervaart and Taubeneck (1959) to describe layering in granitoid rocks in which constituent crystals are oriented approximately perpendicular to individual layers. The term schlieren layering is proposed to describe the “normal” layering of granitic rocks defined by alte
Authors
James G. Moore, J. P. Lockwood

Keweenawan volcanic sequence

No abstract available.
Authors
Huber N. King, H. R. Cornwall

Reducing seismic hazards through land-use planning

No abstract available.
Authors
Donald R. Nichols, Jane M. Buchanan-Banks

Volcano surveillance system based on the Earth Resources Technology satellite

No abstract available.
Authors
David H. Harlow, Peter L. Ward, Jerry P. Eaton, Eliot Endo, Dan Marquez, Rex V. Allen