The chemistry and mineralogy of haloed burrows in pelagic sediment at DOMES Site A: The equatorial North Pacific
D.Z. Piper, P.D. Rude, S. Monteith
1987, Marine Geology (74) 41-55
The chemical and mineralogical composition of burrowed sediment, recovered in 66 box cores at latitude 9°25′N and longitude 151°15′W in the equatorial Pacific, demonstrates the important role of infauna in determining the geochemistry of pelagic sediment. Haloed burrows, approximately 3 cm...
New perspectives on the eruption of 1912 in the valley of ten thousand smokes, Katmai National Park, Alaska
W. Hildreth
1987, Bulletin of Volcanology (49) 680-693
New data extend our understanding of the 1912 eruption, its backfilled vent complex at Novarupta, and magma-storage systems beneath adjacent stratovolcanoes. Initial Plinian rhyolite fallout is confined to a narrow downwind sector, and its maximum thickness may occur as far as 13 km from source. In contrast, the partly contemporaneous...
Determination of the rare-earth elements in geological materials by inductively coupled plasma mass spectrometry
F.E. Lichte, Allen L. Meier, James G. Crock
1987, Analytical Chemistry (59) 1150-1157
A method of analysis of geological materials for the determination of the rare-earth elements using the Inductively coupled plasma mass spectrometric technique (ICP-MS) has been developed. Instrumental parameters and factors affecting analytical results have been first studied and then optimized. Samples are analyzed directly following an acid digestion, without the...
Magmatic history of Red Sea rifting: Perspective from the central Saudi Arabian coastal plain
J.S. Pallister
1987, Geological Society of America Bulletin (98) 400-417
A newly recognized Tertiary dike complex and comagmatic volcanic rocks exposed on the central Saudi Arabian coastal plain record early stages of magmatism related to Red Sea rifting. Intrusive and stratigraphic relationships and new potassium-argon dating indicate episodic magmatism from about 30 Ma to the present. Additional stratigraphic and radiometric...
Gravity anomaly at a Pleistocene lake bed in NW Alaska interpreted by analogy with Greenland's Lake Taserssauq and its floating ice tongue
D.F. Barnes
1987, Journal of Geophysical Research Solid Earth (92) 8976-8984
A possible example of a very deep glacial excavation is provided by a distinctive gravity low located at the front of a valley glacier that once flowed into glacial Lake Aniuk (formerly Lake Noatak) in the western Brooks Range. Geologic and geophysical data suggest that sediments or ice filling a...
The Breeding Bird Survey: Its first fifteen years, 1965-1979
C.S. Robbins, D. Bystrak, P.H. Geissler
1986, Resource Publication 157
The Breeding Bird Survey (BBS) is an ongoing cooperative program sponsored jointly by the U.S. Fish and Wildife Service and the Canadian Wildlife Service. Its main purpose is to estimate population trends of the many species of birds that nest in North America north of Mexico and that migrate across...
Separation and preconcentration of the rare-earth elements and yttrium from geological materials by ion-exchange and sequential acid elution
J.G. Crock, F.E. Lichte, G. O. Riddle, C.L. Beech
1986, Talanta (33) 601-606
The abundance of rare-earth elements (REE) and yttrium in geological materials is generally low, and most samples contain elements that interfere in the determination of the REE and Y, so a separation and/or preconcentration step is often necessary. This is often achieved by ion-exchange chromatography with either nitric or hydrochloric...
Geochemical map of the Chama River Canyon Wilderness and contiguous roadless area, Rio Arriba County, New Mexico
Jennie L. Ridgley
1986, Miscellaneous Field Studies Map 1523-D
The Chama River Canyon Wilderness, in Rio Arriba County, north-central New Mexico, covers 50,300 acres (20,364 hectares) within the Coyote and Cuba Ranger Districts of the Santa Fe National Forest and the Canjilon Ranger District of the Carson National Forest. In 1979 the U.S. Forest Service, under the Forest Service...
Geochemical map of the North Fork John Day River Roadless Area, Grant County, Oregon
James G. Evans
1986, Miscellaneous Field Studies Map 1581-B
The Wilderness Act (Public Law 88-577, September 3, 1964) and related acts require the U.S. Geological Survey and the U.S. Bureau of Mines to survey certain areas on Federal lands to determine their mineral resource potential. Results must be made available to the public and submitted to the President and the...
Geophysical maps of the Winchester Roadless Area, Cochise County, Arizona
R.A. Martin
1986, Miscellaneous Field Studies Map 1851
The Wilderness Act (Public Law 88-577, September 3, 1964) and related acts require the U.S. Geological Survey and the U.S. Bureau of Mines to survey certain areas on Federal lands to determine their mineral resource potential. Results must be made available to the public and be submitted to the President and...
Geochemical survey of the Little Frog Roadless Area, Polk County, Tennessee
E. R. Force, D. F. Siems
1986, Miscellaneous Field Studies Map 1338-B
The Wilderness Act (Public Law 88-577, September 3, 1964) and related acts require the U.S. Geological Survey and the U.S. Bureau of Mines to survey certain areas on Federal lands to determine the mineral values, if any, that may be present. Results must be made available to the public and...
Summary geochemical maps for samples of rock, stream sediment, and nonmagnetic heavy-mineral concentrate, Pyramid Roadless Area, El Dorado County, California
M.A. Chaffee
1986, Miscellaneous Field Studies Map 1616-B
The Wilderness Act (Public Law 88-577, September 3, 1964) and related acts require the U.S. Geological Survey and the U.S. Bureau of Mines to survey certain areas on Federal lands to determine their mineral resource potential. Results must be made available to the public and be submitted to the President and...
Cluster analysis of phytoplankton data collected from the National Stream Quality Accounting Network in the Tennessee River basin, 1974-81
D. W. Stephens, J. B. Wangsgard
1986, Water-Resources Investigations Report 86-4029
A computer program, Numerical Taxonomy System of Multivariate Statistical Programs (NTSYS), was used with interfacing software to perform cluster analyses of phytoplankton data stored in the biological files of the U.S. Geological Survey. The NTSYS software performs various types of statistical analyses and is capable of handling a large matrix...
Statistical summary and evaluation of the quality of surface water in the Colorado River basin, 1973-82 water years
Freeman L. Andrews, Terry L. Schertz
1986, Water-Resources Investigations Report 85-4181
Significant upward trends in dissolved-solids concentrations were detected with the Seasonal Kendall Test for trends at three stations in the upper basin during the study period. The increases exceeded 270 milligrams per liter per year at two stations and 165 milligrams per liter per year at the third station. The composition...
Occurrence and availability of ground water in the Athens region, northeastern Georgia
D. B. Radtke, C.W. Cressler, H.A. Perlman, H.E. Blanchard Jr., K.W. McFadden, Rebekah Brooks
1986, Water-Resources Investigations Report 86-4075
A study was conducted to assess the occurrence and availability of groundwater in the crystalline rocks of the Piedmont area in northeastern Georgia and to determine whether groundwater is a viable alternative or supplemental source for industrial, public and private supplies. The area is underlain by a variety of metamorphic...
Trace-element contents of postorogenic granites of the eastern Arabian Shield, Kingdom of Saudi Arabia
J. S. Stuckless, R. B. Vaughn, George VanTrump Jr.
1986, Open-File Report 86-261
Trace-element contents for 46 postorogenic granitoids vary by as much as two orders of magnitude; most samples are strongly enriched in incompatible elements (such as the heavy rare earths, yttrium, niobium, and uranium) and depleted in the compatible elements (such as barium, strontium, scandium, europium, and cobalt). These trace-element characteristics...
RAREPLOT; a computer program for plotting rare earth element data using an IBM PC, Lotus 1-2-3, and a Hewlett-Packard plotter
R.R. Schumann
1986, Open-File Report 86-570-B
RAREPLOT; a computer program for plotting rare earth element data using IBM PC, Lotus 1-2-3, and a Hewlett-Packard plotter
R.R. Schumann
1986, Open-File Report 86-570-A
Red-Sea rift magmatism near Al Lith, Kingdom of Saudi Arabia
J.S. Pallister
1986, Open-File Report 86-565
A newly recognized Tertiary dike complex and comagmatic volcanic rocks exposed on the central Saudi Arabian coastal plain record early stages of magmatism related to Red Sea rifting. Intrusive and stratigraphic relationships, and new potassium-argon dating indicate episodic magmatism from about 30 Ma to the present. Additional stratigraphic and radiometric...
Mineral resource potential of National Forest RARE II and wilderness areas in Colorado
R. P. Dickerson (compiler)
1986, Open-File Report 86-364
Mineral resources of the Castle Peaks Wilderness Study Area, San Bernardino County, California
David M. Miller, James G. Frisken, Robert C. Jachens, Diann D. Gese
1986, Bulletin 1713-A
The Castle Peaks Wilderness Study Area (CDCA266) comprises approximately 45,000 acres in the northern New York Mountains, San Bernardino County, California. At the request of the Bureau of Land Management, 39,303 acres of the wilderness study area were studied. The area was investigated during 1982-1985 using combined geologic, geochemical, and...
Short-period strain (0.1–105 s): Near-source strain field for an earthquake (ML 3.2) near San Juan Bautista, California
M.J.S. Johnston, Roger D. Borcherdt, A. T. Linde
1986, Journal of Geophysical Research B: Solid Earth (91) 11497-11502
Measurements of dilational earth strain in the frequency band 25–10−5 Hz have been made on a deep borehole strainmeter installed near the San Andreas fault. These data are used to determine seismic radiation fields during nuclear explosions, teleseisms, local earthquakes, and ground noise during seismically quiet times. Strains of less than...
Meeting the challenge of policy-relevant science: lessons from a water resource project
Berton L. Lamb
1986, Journal of the American Water Resources Association (22) 811-815
Water resource scientists face complex tasks in evaluating aspects of water projects, but relatively few assessment procedures have been applied and accepted as standard applications. Decision-makers often rely on environmental assessments to evaluate the value and operation of projects. There is often confusion about scientists' role in policy decisions. The...
Glacial sequence near McCall, Idaho: Weathering rinds, soil development, morphology, and other relative-age criteria
S.M. Colman, Kenneth L. Pierce
1986, Quaternary Research (25) 25-42
The sequence of glacial deposits near McCall, Idaho, previously assigned to the Pinedale and Bull Lake glaciations, contains deposits of four different ages. These ages are defined by multiple relative-age criteria, including weathering rinds, soil development, surface-rock weathering, morainal morphology, and loess stratigraphy. The thickness of weathering rinds on basaltic...
Volcanoes and atmospheres; catastrophic influences on the planets
S. W. Kieffer
1986, Earthquakes & Volcanoes (USGS) (18) 76-83
For a rare and brief instant in geologic time, we can imagine that the sulfurous, chromatic surface of Io (one of the satellites of Jupiter) lies quiet. Perhaps stars glisten brilliantly through the tenuous nigh sky. Here and there, thick icy fogs enshroud fumaroles where sulfur dioxide leaks from the...
