Publications
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Geologic interpretation of an aeromagnetic map of the west-central Columbia Plateau, Washington and Oregon Geologic interpretation of an aeromagnetic map of the west-central Columbia Plateau, Washington and Oregon
A low altitude, total intensity aeromagnetic map of the ?west-central Columbia Plateau, underlain principally by the Yakima Basalt,. shows Positive and negative anomalies that stand out from a moderate intensity .background reflecting .interbedded flows of normal and reversed magnetic polarity. One set of anomalies is related to anticlinal ridges, nother follows the traces of known or...
Authors
Donald A. Swanson, Thomas L. Wright, Isidore Zietz
Chemical compositions of Kilauea east-rift lava, 1968–1971 Chemical compositions of Kilauea east-rift lava, 1968–1971
The major element chemical compositions of lava from four eruptions on the east rift zone of Kilauea between August 1968 and October 1971 reflect three petrologic processes: Production of chemically distinct batches of magma in the mantle. Separation of olivine, augite, and plagioclase from liquid during flow in the rift-zone conduits. Mixing of different magmas during ascent to the...
Authors
Thomas L. Wright, Don Swanson, Wendell A. Duffield
Mechanism of Formation of Pillow Lava Mechanism of Formation of Pillow Lava
Much of the ocean floor is covered by lava of a distinctive character. The lava appears to be made up of closely packed ellipsoidal masses about the size and shape of pillows - hence the term pillow lava. Only within the last few years has the abundance of pillow lava on the ocean floor been fully recognized. Ocean-bottom photographs and dredge samples have shown that the great bulk of...
Authors
James G. Moore
A deep research drill hole at the summit of an active volcano, Kilauea, Hawaii A deep research drill hole at the summit of an active volcano, Kilauea, Hawaii
Drilling and geophysical logging data for a 1,262 m‐deep bore hole in the area inferred to overlie the magma reservoir of Kilauea Volcano, Hawaii, support earlier interpretations based on surface geophysical surveys that a zone of brackish or saline water lies above the reservoir. Temperatures encountered within the hole are not sufficiently high to warrant commercial interest; the...
Authors
Charles J. Zablocki, Robert I. Tilling, D. W. Peterson, Robert L. Christiansen, George V. Keller, John C. Murray
Estimating the “thickness” of the Boulder Batholith, Montana, from heat-flow and heat-productivity data Estimating the “thickness” of the Boulder Batholith, Montana, from heat-flow and heat-productivity data
Estimates of minimum thickness of the Boulder batholith, computed using the linear relation between heat flow and heat productivity and assuming constant heat productivity with depth, are highly nonspecific. They can vary between about 3 and 20 km, depending on values of surface-rock heat productivity and values of assumed contribution of nonbatholith heat sources (such as lower crustal...
Authors
Robert I. Tilling