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May 1, 1992

Structure and fabric of metamorphic terrains in the northeastern Great Basin; implications for Mesozoic crustal short ening and extension Structure and fabric of metamorphic terrains in the northeastern Great Basin; implications for Mesozoic crustal short ening and extension

No abstract available

Authors

P.A. Camilleri, D. M. Miller, A.W. Snoke, M.L. Wells

January 1, 1992

Regional characterization and setting for the Loch Vale Watershed study Regional characterization and setting for the Loch Vale Watershed study

No abstract available.

Authors

Jill S. Baron, M.A. Mast

January 1, 1992

Introduction Introduction

No abstract available.

Authors

Jill S. Baron

January 1, 1992

Effects of weather and soil characteristics on temporal variations in soil-gas radon concentrations Effects of weather and soil characteristics on temporal variations in soil-gas radon concentrations

Concentrations of radon-222 in soil gas measured over about 1 yr at a monitoring site in Denver, Colorado, vary by as much as an order of magnitude seasonally and as much as severalfold in response to changes in weather. The primary weather factors that influence soil-gas radon concentrations are precipitation and barometric pressure. Soil characteristics are important in determining the...

Authors

R. Randall Schumann, Douglass E. Owen, Sigrid Asher-Bolinder

Geosciences and Environmental Change Science Center

January 1, 1992

Partially melted granodiorite and related rocks ejected from Crater Lake caldera, Oregon Partially melted granodiorite and related rocks ejected from Crater Lake caldera, Oregon

Blocks of medium-grained granodiorite to 4 m, and minor diabase, quartz diorite, granite, aplite and granophyre, are common in ejecta of the ∼6,900 yr BP caldera-forming eruption of Mount Mazama. The blocks show degrees of melting from 0–50 vol%. Because very few have adhering juvenile magma, it is thought that the blocks are fragments of the Holocene magma chamber’s walls. Primary...

Authors

Charles R. Bacon

Volcano Hazards Program, Volcano Science Center, Crater Lake

January 1, 1992

Source region of a granite batholith: evidence from lower crustal xenoliths and inherited accessory minerals Source region of a granite batholith: evidence from lower crustal xenoliths and inherited accessory minerals

Like many granites, the Late Cretaceous intrusives of the eastern Mojave Desert, California, have heretofore provided useful but poorly focused images of their source regions. New studies of lower crustal xenoliths and inherited accessory minerals are sharpening these images. Xenoliths in Tertiary dykes in this region are the residues of an extensive partial melting event. Great...

Authors

Calvin F. Miller, John M. Hanchar, Joseph L. Wooden, Victoria C. Bennett, T. Mark Harrison, David A. Wark, David A. Foster

January 1, 1992