Glauconites from New Jersey-Maryland coastal plain: Their K-Ar ages and application in stratigraphic studies
James P. Owens, Norman F. Sohl
1973, Geological Society of America Bulletin (84) 2811-2838
Glauconite samples from various stratigraphic levels in the northern Atlantic Coastal Plain were dated by the K-Ar method. Twenty-eight samples were collected from glauconite-bearing sands in four traverses across the outcrop belt of Upper Cretaceous–lower Tertiary formations from northern New Jersey to eastern Maryland, thus providing a framework on which...
A prototype global volcano surveillance system and identification of a volcano-tectonic fault in Central America
P.L. Ward
1973, Bulletin Volcanologique (37) 438-442
No abstract available....
Regional gravity anomalies and crustal structure in northern Colombia
J. E. Case, W.D. MacDonald
1973, Geological Society of America Bulletin (84) 2905-2916
The central range of the Colombian Andes gives way northward to a series of Cenozoic fault-bordered basins and uplifts near the Caribbean Sea. Pre-Cenozoic structures exposed in the uplifts curve increasingly toward the east to become parallel to the continental margins along the south side of the Caribbean. Major Cenozoic...
Tests of rhodamine WT dye for toxicity to oysters and fish
Garald G. Parker Jr.
1973, Journal of Research of the U.S. Geological Survey (1) 499-499
Because of the toxicity to oyster larvae and eggs of rhodamine B dye in concentrations greater than 1 mg/l in earlier tests, there was a concern that rhodamine WT, a similar tracer dye, would have a detrimental effect on marine life being developed under the aquaculture program of the Lummi...
Structure and development of the continental margin of British Honduras
William P. Dillon, John G. Vedder
1973, Geological Society of America Bulletin (84) 2713-2732
The continental margin of British Honduras is characterized by elongate ridges that are sub-parallel with the coast and that diverge slightly northward. Each ridge apparently is formed by aligned fault blocks composed of continental basement rock that rotated and subsided during rifting of the margin. The western part of the...
Eclogites from southwestern Oregon
Edward D. Ghent, Robert G. Coleman
1973, Geological Society of America Bulletin (84) 2471-2488
Eclogite, high-grade blueschist, and amphibolite blocks occur within the Mesozoic Otter Point Formation of southwestern Oregon and are inferred to have been tectonically emplaced by eastward-directed overthrusting involving Colebrooke Schist and serpentinite.Eclogite from southwestern Oregon is very similar in bulk chemistry and mineralogy to the well-studied eclogite of California.Calculations of...
Biotite as a source of some of the sulfur in porphyry copper deposits
Norman G. Banks
1973, Economic Geology (68) 697-703
No abstract available....
Alaska-Aleutian range batholith: Geochronology, chemistry, and relation to circum-Pacific plutonism
Bruce L. Reed, Marvin A. Lanphere
1973, GSA Bulletin (84) 2583-2610
Potassium-argon mineral ages and reconnaissance mapping of approximately 65,000 sq km in south-central Alaska indicate that the Mesozoic and Cenozoic plutonic rocks in the region were emplaced during three discrete intrusive epochs. Most of the plutonic rocks are part of the Alaska-Aleutian Range batholith; the remainder appear as outcrops in...
Galkhaite, (Hg,Cu,Tl,Zn) (As,Sb)S2, from the Getchell mine, Humboldt County, Nevada
Theodore Botinelly, George J. Neuerburg, Nancy M. Conklin
1973, Journal of Research of the U.S. Geological Survey (1) 515-517
The first reported occurrence in the United States of galkhaite (Hg,Cu,Tl,Zn)(As,Sb)S2 is at the Getchell mine, Humboldt County, Nev. The mineral occurs as brownish-black cubes associated with graphite, pyrite, and realgar. In polished section galkhaite is grayish white and isotropic with a deep-red internal reflection; reflectivity at 590 nm is 21.6 percent. Spectrographic analysis gave...
The enthalpies of formation of nesquehonite, MgCO3 * 3H2O, and hydromagnesite, 5MgO * 4CO2 * 5H2O
Bruce S. Hemingway, Richard A. Robie
1973, Journal of Research of the U.S. Geological Survey (1) 543-547
The enthalpies of formation, ΔH°f, of nesquehonite, MgCO3 * 3H2O, and hydromagnesite, 5MgO * 4CO2 * 5H2O, have been determined by HCl solution calorimetry. For the reaction MgO(c) + CO2(g) + 3H2O(l) = MgCO2 * 3H2O(c), the enthalpy change at 298.15 K is -29,781*40 cal mor' . For the reaction 5MgO(c) +...
Bathymetry of the continental margin off Liberia, West Africa
John Schlee, James M. Robb, John C. Behrendt
1973, Journal of Research of the U.S. Geological Survey (1) 563-567
A bathymetric map based on new data allows examination of geomorphic features on the narrow continental margin off Liberia. The continental shelf in this region is relatively flat and featureless. The northwestern part of the continental slope, off Monrovia and Cape Mount, shows complex slump features and two submarine valleys. The central part of the...
Remote sensing of turbidity plumes in Lake Ontario
E.J. Pluhowski
1973, Journal of Research of the U.S. Geological Survey (1) 609-614
High-altitude photography provides an effective method of monitoring the spatial extent of turbidity plumes in Lake Ontario. Large plumes generated by the Niagara, Genesee, and Oswego Rivers are identifiable on photographs obtained from about 60,000 feet above the lake on July 6, 1970, October 19, 1970, and May 29, 1971. The Niagara plume, covering as...
Method for estimating the diversion potential of streams in eastern Massachusetts and southern Rhode Island
Gary D. Tasker
1973, Journal of Research of the U.S. Geological Survey (1) 615-619
A simple method is proposed for estimating the probable magnitude and frequency of streamflow that is in excess of predetermined minimum streamflows required downstream in eastern Massachusetts and southern Rhode Island. Regional curves relate these annual volumes of streamflow excess to the average annual discharge and the median 7-day annual minimum flow of the site....
Aquifer diffusivity of the Ohio River alluvial aquifer by the flood-wave response method
Harold H. Zehner, Hayes F. Grubb
1973, Journal of Research of the U.S. Geological Survey (1) 597-601
Aquifer diffusivity (T/S) was calculated for 10 sites in the alluvial aquifer adjacent to the Ohio River by observing the response of the aquifer to a flood wave in the river. The calculated type curves matched the observed aquifer response reasonably well at eight of the 10 sites. The diffusivities ranged from 0.4 ft2...
A study of the distribution of the polychlorinated biphenyls in the aquatic environment
Hans J. Crump-Wiesner, Herman R. Feltz, Marvin L. Yates
1973, Journal of Research of the U.S. Geological Survey (1) 603-607
Data gathered from monitoring activities and project studies indicate the ubiquitous occurrence and distribution of polychlorinated biphenyls in the aquatic environment. Residues have been detected in samples from 19 States, representing nearly every region of the country. Concentrations ranged from 0.1 to 4.0 ug/l in unfiltered water samples and 5.0 to 3,200 ug/kg in bottom...
Changes in floodflow characteristics of a rectified channel caused by vegetation, Jackson, Mississippi
K. V. Wilson
1973, Journal of Research of the U.S. Geological Survey (1) 621-625
Extreme changes in velocity, stage, and Manning's roughness coefficient, n, were observed during the first year after canalization of Hanging Moss Creek at Jackson, Miss. Additional changes were observed during the following 8 years. The channel, constructed during the summer of 1963, had a 50-foot-wide bottom, 2:1 side slopes, and 12-foot depth. In March 1964,...
Ice ages and the thermal equilibrium of the earth
David P. Adam
1973, Journal of Research of the U.S. Geological Survey (1) 587-596
A model for climatic change, and particularly for the changes of the late Cenozoic, involves as its primary variables the albedo of the earth and the heat storage characteristics of the oceans. Geography exerts a strong influence. The model proposed does not require metaphysical causes or astronomical events other than known variations in the earth's...
Pliocene marine fossils in the Paso Robles Formation, California
Warren O. Addicott, Jon S. Galehouse
1973, Journal of Research of the U.S. Geological Survey (1) 509-514
Marine invertebrates from the Paso Robles Formation recently discovered near Atascadero, Calif., indicate that the basal part of this chiefly nonmarine deposit is of provincial early Pliocene age. Heretofore the lack of direct fossil or radiometric evidence of the age of the Paso Robles has made it a difficult unit to place in the...
The Dun Mountain ultramafic belt Permian oceanic crust and upper mantle in New Zealand
M.C. Blake Jr., C. A. Landis
1973, Journal of Research of the U.S. Geological Survey (1) 529-534
Geologic evidence suggests that the Dun Mountain ultramafic belt in New Zealand is the basal part of a Lower Permian ophiolite suite. By analogy with other ophiolite suites, and as a result of marine geophysical studies of the present ocean basins, the ophiolite is believed to represent oceanic crust and upper mantle upon which...
Disseminated pyrite in a latite porphyry at Texan Mountain, Hudspeth County, Texas
Thomas E. Mullens
1973, Journal of Research of the U.S. Geological Survey (1) 519-521
A pyrite-bearing latite porphyry that contains fragments of syenite and a quartz porphyry intruded into the Cretaceous Cox Sandstone are well exposed in a roadcut at Texan Mountain, Hudspeth County, Tex. The pyrite, which occurs along tiny fractures as well as disseminated, and the multiple episodes of intrusion, coupled with copper minerals in veins in...
Chemical analysis of rutile - a pyrocatechol violet spectrophotometric procedure for the direct microdetermination of zirconium
Robert Meyrowitz
1973, Journal of Research of the U.S. Geological Survey (1) 549-554
The ZrO2 content of rutile is determined spectrophotometrically by a direct pyrocatechol violet procedure. The sample is decomposed by potassium pyrosulfate fusion in a transparent quartz crucible, and a sulfuric acid solution of the melt is used for the determination at a pH of 5.1. Of the elements commonly present in rutile, only titanium and niobium...
Spectrophotometric determination of tungsten in rocks by an isotope dilution procedure
E.G. Lillie, L. Paul Greenland
1973, Journal of Research of the U.S. Geological Survey (1) 555-558
Samples are decomposed with hydrofluoric acid and perchloric acid in the presence of W181 tracer. Molybdenum is extracted from a hydrochloric acid solution with tributyl phosphate. Tungsten is separated from most other elements by extraction of the a-benzoinoximate into chloroform. Stannous chloride in concentrated hydrochloric acid is used to strip tungsten and reduce it to...
Use of machine-processable field notes in a wilderness mapping project (Granite Fiords area), southeastern Alaska
Henry C. Berg, James G. Smith
1973, Journal of Research of the U.S. Geological Survey (1) 579-585
For reconnaissance geologic mapping and mineral resource evaluation of the Granite Fiords wilderness study area, we developed and used a system of machine-processable field notes. Preprinted field forms standardize notes and serve as checklists that insure collection of all available data. The use of this system cut in half the time required to record data...
Spectrochemical computer analysis - argon-oxygen d-c arc method for silicate rocks
A. F. Dorrzapf Jr.
1973, Journal of Research of the U.S. Geological Survey (1) 559-562
Use of an argon-oxygen atmosphere eliminates the interference of cyanogen bands with many sensitive analytical lines. The jet-controlled atmosphere also improves the stability of the arc. These procedural changes, coupled with computerized analysis of the spectra, result in increased detectability, precision, and speed as compared to the former visual semiquantitative technique....
Soda Creek springs - metamorphic waters in the eastern Alaska Range
D.H. Richter, D.E. Donaldson, R.A. Lamarre
1973, Journal of Research of the U.S. Geological Survey (1) 523-528
The Soda Creek springs are a group of small, cold mineral springs on the southern flank of the eastern Alaska Range. The spring waters contain anomalous concentrations of carbon dioxide, sodium, chlorine, sulfate, boron, and ammonia and are actively precipitating deposits of calcite and aragonite. Sparingly present in these deposits are mixed-layer illite-montmorillonite clays and...
