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Browse more than 5,500 book chapters authored by our scientists over the past 100+ year history of the USGS and refine search by topic, location, year, and advanced search.

Filter Total Items: 6063

Miocene monzonitic intrusions and associated megabreccias of the "Iron Axis" region, southwestern Utah

No abstract available 
Authors
H. R. Blank, P. D. Rowley, D.B. Hacker

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

Regional characterization and setting for the Loch Vale Watershed study

No abstract available.
Authors
Jill S. Baron, M.A. Mast

Introduction

No abstract available.
Authors
Jill S. Baron

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 magnitude
Authors
R. Randall Schumann, Douglass E. Owen, Sigrid Asher-Bolinder
By
Geosciences and Environmental Change Science Center

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 crystallisation
Authors
Charles R. Bacon
By
Volcano Hazards Program, Volcano Science Center, Crater Lake

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

Deposition

No abstract available.
Authors
Jill Baron, A. Scott Denning, P. McLaughlin

Management implications

No abstract available.
Authors
Jill S. Baron

Biogeochemical fluxes

No abstract available.
Authors
Jill S. Baron

Surface waters

No abstract available.
Authors
Jill S. Baron

Techniques for assessing cumulative impacts

No abstract available.
Authors
C. Hunsaker, S. C. Williamson