Two diamictons in a landslide scarp on Admiralty Island, Alaska, and the tectonic insignificance of an intervening peat bed
Robert D. Miller
1973, Journal of Research of the U.S. Geological Survey (1) 309-314
Two till-like diamictons, 700 feet above present sea level on Admiralty Island, Alaska, are separated by peat near the top of a landslide scarp. The lower diamicton is glaciomarine; the upper diamicton is probably a mudflow. The lower diamicton contains the foraminifer Elphidium clavatum Cushman, a species typical of fiords. Similar diamicton crops out along...
A photogeologic method for determining the direction of horizontal dilation from patterns of en echelon fracturing
Wendell A. Duffield, K. Nakamura
1973, Journal of Research of the U.S. Geological Survey (1) 283-287
The direction of horizontal dilation in areas characterized by tensional tectonics can be determined from a statistical study of en echelon patterns of fracturing observed on aerial photographs. Relative, to a north-south dilation, nearly all directions of zones of dextral (right-lateral) en echelon fractures lie in the northeast quadrant, while those of sinistral (left-lateral) en...
The chemistry of five accessory rock-forming apatites
Donald E. Lee, Harry J. Rose Jr., Elaine L. Munson Brandt, Richard E. Van Loenen
1973, Journal of Research of the U.S. Geological Survey (1) 267-272
Chemical and physical data are given for five samples of rock-forming apatite from diverse geologic environments in Nevada and Colorado. Four of these apatites contain rare-earth assemblages in which the cerium group is well represented but the yttrium group predominates. The fifth apatite contains a highly fractionated assemblage of the lighter (cerium group) rare earths...
Radioelement and radiogenic heat distribution in Drill Hole UCe-1, Belmont Stock, Central Nevada
C. M. Bunker, C. A. Bush
1973, Journal of Research of the U.S. Geological Survey (1) 289-292
Uranium, thorium, and potassium concentrations were measured in 60 samples collected from an exploratory hole drilled in the Belmont stock about 40 miles north-northeast of Tonopah, Nev. The results indicate that, at least within 2,000 feet of the surface, the granitic pluton contains radioelement concentrations similar to those in average granodiorites and that local...
Microbiological aspects of ground-water recharge injection of purified unchlorinated sewage effluent at Bay Park, Long Island, N. Y.
G. G. Ehrlich, Theodore A. Ehlke, John Vecchioli
1973, Journal of Research of the U.S. Geological Survey (1) 341-344
Unchlorinated, tertiary-treated sewage effluent was injected through a well at Bay Park, Long Island, N.Y., into a sand aquifer at a rate of 340 gpm for 10 days. Massive, biologically produced slime deposits formed in the filter pack immediately adjacent to the well screen. Observed head buildup in the recharge well was correlated with the...
Photomechanical experiments in automated cartography
C.R. Gilman
1973, Journal of Research of the U.S. Geological Survey (1) 223-227
The U.S. Geological Survey recently undertook the investigation of two seemingly unrelated cartographic tasks: (1) the preparation of map copy for digitizing and (2) the production of experimental slope maps. Both tasks, however, require techniques and equipment for changing or manipulating the line weights of existing map symbols and producing suitable reproduction copy. After a...
Formation of joints in bedrock by moving glacial ice
Frank W. Trainer
1973, Journal of Research of the U.S. Geological Survey (1) 229-235
The orientation of joints in igneous and sedimentary rocks was measured at 21 localities in California, Maine, and New York to investigate the hypothesis that glaciation may open joints in bedrock. A summary of strikes of all joint sets shows the following pattern relative to the direction of glacial advance: two sets, thought to...
Rapid reaction rates between water and a calcareous clay as observed by specific-ion electrodes
Warren W. Wood
1973, Journal of Research of the U.S. Geological Survey (1) 237-241
Specific-ion electrodes were used to simultaneously determine the activity changes of calcium, hydrogen, sodium, fluoride, and divalent ions when 50 g of a natural, untreated material containing calcium-rich mixed-layer illite-montmorillonite clay, quartz sand, and calcium carbonate was added to 250 ml of natural Canadian River water containing 220 mg/1 Na. Calcium and magnesium were displaced from...
A spectrochemical method for determining the composition of native gold
A.L. Sutton, R.G. Havens, C.L. Sainsbury
1973, Journal of Research of the U.S. Geological Survey (1) 301-307
The spectrochemical method described herein for determining trace, minor, and major element distribution in native gold is applicable over a wide range of particle sizes and over a very large concentration range. The matrices of samples and standards are very closely matched. The method was tested on 100 nuggets from a gold sample collected in...
Geology of a system of submarine canyons south of Puerto Rico
Louis E. Garrison, James V. A. Trumbull
1973, Journal of Research of the U.S. Geological Survey (1) 293-299
A strongly dendritic submarine canyon system with four major canyons occupies a 30-km indentation in the insular shelf off the south coast of Puerto Rico between Guanica and Ponce. Each canyon has several headward branches at depths of 100 to 1,100 m. Each of the five major rivers that reach the coast between Guanica...
Petrography and structural relations of granitic basement rocks in the Monterey Bay area, California
Donald C. Ross, Earl E. Brabb
1973, Journal of Research of the U.S. Geological Survey (1) 273-282
In the past, the granitic basement of the Coast Ranges has been thought to be dominantly quartz diorite and low in K-feldspar. However, a study of outcrops around Monterey Bay, basement well samples, and dredge samples from Monterey Bay shows that the granitic basement averages about 15 to 20 percent K-feldspar. Therefore, as...
Are the granitic rocks of the Salinian block trondhjemitic?
Donald C. Ross
1973, Journal of Research of the U.S. Geological Survey (1) 251-254
Trondhjemitic rocks are relatively abundant in the granitic terranes of the western Sierra Nevada and the Klamath Mountains but have not been found in the granitic plutons of the Salinian block, which lies westward, across the San Andreas fault. A ternary plot of modal quartz : K-feldspar : plagioclase from more than 200 granitic...
Summary of ground-water hydrological data in Michigan for 1971
G.C. Huffman, T. Thompson
1973, Report
No abstract available....
A rapid method for the determination of radioactive cesium isotopes in water
V.J. Janzer
1973, Journal of Research of the U.S. Geological Survey (1) 113-115
Radioactive cesium in water is concentrated by ion-exchange on finely divided ammonium hexacyanocobalt ferrate (NCFC), and then determined by beta counting. No carrier is added, and the method can be used to determine beta-emitting cesium isotopes at the 10-pCi/l level using a 100-ml sample. Five samples can be prepared for...
Ground water in perspective
R. L. Nace
1973, JAWRA (9) 18-24
Owing to their enormous capacity, ground‐water reservoirs are at least equal in importance to the ground water itself. As regulators of water movement in the hydrological cycle, these reservoirs surpass all lakes combined, natural and manmade. While many aquifers are not well understood, data on many others are adequate for...
Contrasting compositions of the youngest Columbia River basalt flows in Union and Wallowa Counties, northeastern Oregon
George W. Walker
1973, Geological Society of America Bulletin (84) 425-429
Note: This paper is dedicated to Aaron and Elizabeth Waters on the occasion of Dr. Waters' retirement.Several new chemical analyses of flows confined to a structural downwarp in northeastern Oregon indicate the first reported occurrence of Late-Yakima–type basalt in the region and the close stratigraphic association of Yakima–type and Late-Yakima–type...
Ironside Mountain, Oregon: A late Tertiary volcanic and structural enigma
T. P. Thayer, C. Ervin Brown
1973, Geological Society of America Bulletin (84) 489-498
Note: This paper is dedicated to Aaron and Elizabeth Waters on the occasion of Dr. Waters' retirement.Ironside Mountain is a 6- by 10-km block of folded rhyolite, andesite, and basalt flows of the Strawberry Volcanics bounded by a horse-shoe-shaped reverse fault and surrounded by Mesozoic rocks. The toe of the...
Petrology of Newberry Volcano, central Oregon
Michael W. Higgins
1973, Geological Society of America Bulletin (84) 455-487
Note: This paper is dedicated to Aaron and Elizabeth Waters on the occasion of Dr. Waters' retirement.The eastern flank of the central and southern Cascade Mountains is bordered by a belt of shield volcanoes that appears to be a subprovince of the Oregon high-alumina plateau basalt petrologic province. Most of...
Geochronology of Precambrian rocks of the Teton Range, Wyoming
John C. Reed Jr., R. E. Zartman
1973, Geological Society of America Bulletin (84) 561-582
Note: This paper is dedicated to Aaron and Elizabeth Waters on the occasion of Dr. Waters' retirement.The oldest rocks in the Teton Range are complexly deformed interlayered biotite gneiss, plagioclase gneiss, amphibole gneiss, and amphibolite. Also, within these rocks, there are concordant bodies of strongly lineated quartz monzonite gneiss, here...
Reconnaissance study of the strontium isotopic composition of Cenozoic volcanic rocks in the northwestern Great Basin
Donald C. Noble, Carl E. Hedge, Edwin H. McKee, Marjorie K. Korringa
1973, Geological Society of America Bulletin (84) 1393-1405
Sixteen mafic and intermediate lava flows of Eocene to Pleistocene age from the northwestern Great Basin have initial Sr87/Sr86 ratios of from 0.7029 to 0.7047. Seven upper Miocene mafic and intermediate lava flows have initial ratios of from 0.7037 to 0.7041, suggesting a common source for the Steens Basalt and contemporaneous...
Pahoehoe flows from the 1969–1971 Mauna Ulu eruption, Kilauea Volcano, Hawaii
Donald A. Swanson
1973, Geological Society of America Bulletin (84) 615-626
Note: This paper is dedicated to Aaron and Elizabeth Waters on the occasion of Dr. Waters' retirement.Three types of chemically similar pahoehoe flows were observed to form during the 1969–1971 Mauna Ulu eruption. (1) A cavernous type called shelly pahoehoe, characterized by fragile gas cavities, small tubes, and buckled fragments...
Zircon fission-track ages of Pearlette family ash beds in Meade County, Kansas
C. W. Naeser, Glen A. Izett, Ray E. Wilcox
1973, Geology (1) 93-95
Pearlette family volcanic ash beds at two faunally important late Cenozoic localities near Meade, Meade County, Kansas, are very similar in chemical and mineralogic composition, yet their zircon microphenocrysts have markedly different fission-track ages. Zircon microphenocrysts from type B Pearlette volcanic ash underlying sediments that contain the Borchers local fauna...
Hybrid origin of the absarokite-shoshonite-banakite Series, Absaroka Volcanic Field, Wyoming
Harold J. Prostka
1973, Geological Society of America Bulletin (84) 697-701
Textural and mineralogical features of potash-rich basaltic rocks of the absarokite-shoshonite-banakite series strongly suggest that most of the large crystals and aggregates in these rocks are xenocrysts and microxenoliths, not true phenocrysts as was previously thought. A hybrid origin, involving assimilation of gabbro by high-temperature syenitic magma, is proposed....
Miocene tholeiitic basalts of coastal Oregon and Washington and their relations to coeval basalts of the Columbia Plateau
Parke D. Snavely Jr., Norman S. MacLeod, Holly C. Wagner
1973, Geological Society of America Bulletin (84) 387-424
Note: This paper is dedicated to Aaron and Elizabeth Waters on the occasion of Dr. Waters' retirement.Tholeiitic basalt flows and breccias of Miocene age in western Oregon and Washington form three distinct stratigraphic units. Each unit was erupted from coastal vents marked by dikes and sills of the same composition...
Age of mineralization at Summitville, Colorado, as indicated by K-Ar dating of Alunite
H. H. Mehnert, P. W. Lipman, T. A. Steven
1973, Economic Geology (68) 399-401
No abstract available. ...
