Metagraywacke in the Salinian Block, central Coast Ranges, California: And a possible correlative across the San Andreas Fault
Donald C. Ross
1976, Journal of Research of the U.S. Geological Survey (4) 683-696
The schist of Sierra de Salinas is a monotonously homogeneous biotite quartzofeldspathic schist with minor amounts of quartzite, amphibolite, and marble that forms a northwest-trending outcrop belt that strikes across parts of the Santa Lucia and Gabilan Ranges and is traceable further south in the subsurface to where it is...
Gravity studies in the Carolina slate belt near the Haile and Brewer mines, north-central South Carolina
Henry Bell III, Peter Popenoe
1976, Journal of Research of the U.S. Geological Survey (4) 667-682
The Bouguer gravity map of part of the Carolina slate belt near the Haile and Brewer mines in South Carolina shows anomalies related to rock units. The most conspicuous of the anomalies coincide with coarse-grained granitic plutons. Mathematically calculated models using an iterative three-dimensional solution of the gravity anomalies show...
A comparison of Landsat images and Nimbus thermal-inertia mapping of Oman
Howard A. Pohn
1976, Journal of Research of the U.S. Geological Survey (4) 661-665
Thermal-inertia maps can be used in conjunction with Landsat photographs to resolve ambiguous identification of lithologies in remote areas....
Geothermal flux through palagonitized tephra, Surtsey, Iceland: The Surtsey temperature-data-relay experiment via Landsat-1
Jules D. Friedman, Duane M. Preble, Sveinn P. Jakobsson
1976, Journal of Research of the U.S. Geological Survey (4) 645-659
The net geothermal flux through palagonitized basaltic tephra rims of the Surtur I and Surtur II craters at Surtsey, Iceland, in 1972, is estimated at 780 ±325 μcal cm-2s-1, indicating a decline since 1969 when a flux of 1,500 μcal cm-2s-1 was estimated. Heat flux in this range characterizes the...
The heat capacities of Calorimetry Conference copper and of muscovite KAl2(AlSi3)O10 (OH)2, pyrophyllite Al2Si4O10(OH)2, and illite K3(Al7Mg)(Si14Al2)O40(OH)8 between 15 and 375 K and their standard entropies at 298.15 K
Richard A. Robie, Bruce S. Hemingway, William H. Wilson
1976, Journal of Research of the U.S. Geological Survey (4) 631-644
The heat capacities of Calorimetry Conference copper and of muscovite, pyrophyllite, and illite were measured between 15 and 375 K using an adiabatic calorimeter. Tables of the thermodynamic functions C°p.(H°T —H°O)/T, (G°T —H°O)/T, and S°T —S°O are presented for these phases at integral temperatures from 0 to. 370 K. At...
Fracturing and subsidence of the land surface caused by the withdrawal of ground water in the Milford area, Utah
R.M. Cordova, R. W. Mower
1976, Journal of Research of the U.S. Geological Survey (4) 505-510
Fracturing and subsidence of the land surface in the Milford area of Utah have resulted from the decline of water levels due to pumping in unconsolidated deposits of Quaternary age. To the writers' knowledge, these are the first such effects of ground-water withdrawal reported in Utah. The fracturing is in an...
Improving estimates of streamflow characteristics by using Landsat-1 imagery
Este F. Hollyday
1976, Journal of Research of the U.S. Geological Survey (4) 517-531
Imagery from the first Earth Resources Technology Satellite (renamed Landsat-1) was used to discriminate physical features of drainage basins in an effort to improve equations used to estimate streamflow characteristics at gaged and ungaged sites. Records of 20 gaged basins in the Delmarva Peninsula of Maryland, Delaware, and Virginia were...
Brown, yellow, orange, and greenish-black thorites from the Seerie pegmatite, Colorado
Mortimer H. Staatz, John W. Adams, James S. Wahlberg
1976, Journal of Research of the U.S. Geological Survey (4) 575-582
Four types of thorite - brown, yellow, orange, and greenish-black - occur together in narrow fracture fillings rich in brown fluorite near the outer edge of the Seerie pegmatite. The brown thorite is by far the most abundant. The thorites are remarkably similar in composition except for their Fe2O3 and...
An infiltration index useful in estimating low-flow characteristics of drainage basin
Jeffrey T. Armbruster
1976, Journal of Research of the U.S. Geological Survey (4) 533-538
Regionalization of low flows using basin characteristics has not produced satisfactory results because the effect of geology has not been included. In the Susquehanna River basin, ground-water discharge from the regolith is the primary source of low flows. This paper describes the development of an infiltration index, which, by characterizing...
The aeromagnetic expression of bedrock geology between the Clinton-Newbury and Bloody Bluff fault zones, northeastern Massachusetts
Donald C. Alvord, Kenneth G. Bell, Maurice H. Pease Jr., Patrick J. Barosh
1976, Journal of Research of the U.S. Geological Survey (4) 601-604
The pattern of mapped bedrock geology in northeastern Massachusetts bears a striking similarity to patterns of aeromagnetic anomalies in the area. The correspondence of the geology with the anomaly pattern and lineaments on aeromagnetic maps is especially well shown northwest of Boston between the Clinton-Newbury and Bloody Bluff fault zones....
Fresh ground water found deep beneath Nantucket Island, Masachusetts
F. A. Kohout, E.H. Walker, Michael H. Bothner, J.C. Hathaway
1976, Journal of Research of the U.S. Geological Survey (4) 511-515
In a deep water-resources and stratigraphic test well near the center of Nantucket Island, about 30 miles (48 kilometres) off the New England coast, freshwater has been found at greater depths than predicted by the Ghyben-Herzberg principle. An uppermost lens of freshwater, which occupies relatively permeable glacial-outwash sand and gravel...
Gamma-ray spectrometer measurement of 238U/235U in uranium ore from a natural reactor at Oklo, Gabon
Robert M. Moxham
1976, Journal of Research of the U.S. Geological Survey (4) 589-592
About 20 years ago, Kuroda theorized that a high-grade uranium deposit emplaced about 2x109 years ago could achieve criticality and sustain a nuclear chain reaction, given a sufficient thickness of high-grade ore and an appropriate water content. Such a natural reactor was found in 1972 at the Oklo deposit, Gabon....
Prehnite in plutonic and metamorphic rocks of the northern Santa Lucia Range, Salinian block, California
Donald C. Ross
1976, Journal of Research of the U.S. Geological Survey (4) 561-568
Prehnite is abundant as monomineralic veins, as lenses in biotite, and as discrete patches and apparent primary crystals in both plutonic and metamorphic rocks along the west edge of the Salinian block in the northern Santa Lucia Range. The prehnite appears to be concentrated near the Sur fault zone but...
Confidence limits for flood-frequency curves computed from samples from Pearson type III populations
Clayton H. Hardison
1976, Journal of Research of the U.S. Geological Survey (4) 545-547
A study of T-year events computed from samples drawn from Pearson type III populations of known skew indicates that for skew coefficients between -1.0 and 1.0, confidence limits can be derived from the confidence limits computed for frequency curves based on samples from normal distributions. For samples from populations with...
Sedimentary depositional environments of uranium and petroleum host rocks of the Jackson Group, south Texas
Kendell A. Dickinson
1976, Journal of Research of the U.S. Geological Survey (4) 615-629
Determination of depositional environments in rocks of the Jackson Group of late Eocene age aids in the exploration for uranium and petroleum in south Texas. During deposition of the Jackson Group, conditions were similar to those existing along the modern Gulf Coast of Texas except for a less arid climate...
Field verification of method for distributing flow through multiple-bridge openings
Fred N. Lee
1976, Journal of Research of the U.S. Geological Survey (4) 539-543
Field data collected at three sites in Louisiana having multiple-bridge openings were used to check a method of distribution of flow through two or more bridges. Actual peak discharges in the various main and overflow bridges ranged from 878 to 11,055 cubic feet per second (24.9 to 313 m2/s). The...
Bulk chemical analyses of petrographic thin sections of rocks of the Samli area, western Turkey
James R. Lindsay, Gerhard W. Leo
1976, Journal of Research of the U.S. Geological Survey (4) 569-574
Petrographic thin sections have been analyzed for their major-element composition using a fusion-dilution technique and measuring the intensity of X-rays by means of the electron microprobe. The balsam-mounted thin sections were removed from the glass slides by soaking them in methylene chloride. The freed sections were mixed with twice their...
Pre-Eocene rocks of Java, Indonesia
Keith B. Ketner, Kastowo, Subroto Modjo, C. W. Naeser, J. D. Obradovich, Keith Robinson, Tatan Suptandar, Wikarno
1976, Journal of Research of the U.S. Geological Survey (4) 605-614
The exposed pre-Eocene rocks of Java can be divided into two compound units for purposes of reconnaissance mapping and structural interpretation: a sedimentary sequence and melange. The sedimentary sequence consists of moderately deformed and little-metamorphosed conglomerate, sandstone, mudstone, claystone, chert, and limestone. The melange consists of a chaotic mechanical mixture...
Volcanic rocks of the eastern and northern parts of the San Francisco volcanic field, Arizona
Richard B. Moore, Edward W. Wolfe, George E. Ulrich
1976, Journal of Research of the U.S. Geological Survey (4) 549-560
The eastern and northern parts of the San Francisco volcanic field, between San Francisco Mountain and the Little Colorado River, contain about 175 cinder cones, many with one or more associated lava flows, and one center of silicic volcanism, O'Leary Peak. Basaltic flows and cones are divided into five groups,...
Compositional variations in wolframite from the Hamme (Tungsten Queen) mine, North Carolina
M. L. Bird, J. E. Gair
1976, Journal of Research of the U.S. Geological Survey (4) 583-588
A microprobe study of wolframite from the Tungsten Queen mine, Hamme district, North Carolina, proves it to be almost pure huebnerite. Concentric zoning, which shows up as light-brown and dark-brown bands, indicates small variations in the content of FeO. There is no apparent correlation between the small variations in the...
Determining population size of territorial red-winged blackbirds
P.H. Albers
1976, Journal of Wildlife Management (40) 761-768
Population sizes of territorial male red-winged blackbirds (Agelaius phoeniceus) were determined with counts of territorial males (area count) and a Petersen-Lincoln Index method for roadsides (roadside estimate). Weather conditions and time of day did not influence either method. Combined roadside estimates had smaller error bounds than the individual transect estimates...
Bicarbonate content of groundwater in carbonate rock in eastern North America
F.W. Trainer, R.C. Heath
1976, Journal of Hydrology (31) 37-55
In carbonate-rock terrane the most effective solution occurs where soil and vegetative cover facilitate biogenic production and storage of CO2 in the soil until part of it is carried downward in percolating water. Bicarbonate data for groundwater in eastern North America are examined in the light of these conditions, of...
Hydrologic unit map-1974, State of Minnesota
U.S. Geological Survey
1976, Report
No abstract available....
Status of projects in Minnesota, fiscal years 1976 and 1977
U.S. Geological Survey
1976, Report
No abstract available....
Relocation of local earthquakes by seismic ray tracing
E.R. Engdahl, W.H.K. Lee
1976, Journal of Geophysical Research (81) 4400-4406
Seismic ray tracing is used to relocate a set of local earthquakes recorded by a dense seismic array in Bear Valley, California. The crustal velocity structure is two-dimensional and incorporates most of the known and inferred velocity differences in the region. Relocated hypocenters fall within the San Andreas fault zone,...
