Ellis L. Yochelson
1974, Journal of Research of the U.S. Geological Survey (2) 717-722
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Publication Extents
Not all publications have extents, not all extents are completely accurateE. H. Bailey, Blake
1974, Journal of Research of the U.S. Geological Survey (2) 637-656
Sixty-four major element analyses of rocks representative of the Coast Range ophiolite in California were compared with analyses of other onland ophiolite sequences and those of rocks from oceanic ridges. The rocks can be classed in five groups harzburgite-dunite, clinopyroxenite-wehrlite, gabbro, basalt-spilite, and keratophyre-quartz keratophyre which on various diagrams occupy...
Fred Barker, Z. E. Peterman, W.T. Henderson, R.E. Hildreth
1974, Journal of Research of the U.S. Geological Survey (2) 705-709
The quartz-eye trondhjemite and associated hornblendite near Rio Brazos, Brazos Peak quadrangle, New Mexico, and the Kroenke Granodiorite of the Mount Harvard quadrangle and Sawatch Range, Colo., lie on an approximate 1,700-m.y. Rb-Sr isochron. Their initial 8 7Sr/ 8 6Sr ratio is about 0.7026. Six samples...
R. A. Gulbrandsen
1974, Journal of Research of the U.S. Geological Survey (2) 693-696
Buddingtonite is distributed widely in the rocks of the Meade Peak Member of the Phosphoria Formation in southeastern Idaho and occurs in amounts up to about 50 percent. Most of the buddingtonite is in the middle mudstone interval of the member between two phosphate-rich intervals. The composition of the buddingtonite,...
John Marinenko, Leung Mei
1974, Journal of Research of the U.S. Geological Survey (2) 701-703
Minor and major levels of vanadium in rutile are separated from titanium and iron by sample fusion with sodium carbonate followed by water leach and filtration. The filtrate is then acidified with hydrochloric acid. Silicates are decomposed with a mixture of hydrofluoric and hydrochloric acids, and iron is separated by...
Helen L. Foster, Terry E.C. Keith
1974, Journal of Research of the U.S. Geological Survey (2) 657-669
More than 97 separate occurrences of ultramafic rocks, some of which are included in a north west-trending zone of alpine-type ultramafic rocks, have been mapped in the Eagle quadrangle, east-central Alaska. They are divided into three groups primarily on the basis of degree of serpentinization. Group I consists of lens-shaped bodies...
Donald E. Lee, Willis P. Doering
1974, Journal of Research of the U.S. Geological Survey (2) 671-675
In a magmatic environment, barium usually substitutes for potassium in the crystallizing silicates, and the two increase together in rocks late in the differentiation sequence. Results of this study show the opposite trend in an equivalent of a large part (63-76 percent SiO2) of the classic differentiation sequence that resulted...
Mortimer H. Staatz, Van E. Shaw, James S. Wahlberg
1974, Journal of Research of the U.S. Geological Survey (2) 677-683
Rare earths, although equal to or more abundant than thorium in many thorium veins, are much less abundant than thorium in the veins on Hall Mountain, Idaho. Total rare-earth content of these veins ranges from 0.00111 to 0.197 percent in 12 samples from 10 veins; the thoria (ThO2 ) content,...
D. L. Schmidt, Irving Friedman
1974, Journal of Research of the U.S. Geological Survey (2) 711-715
Freshwater deposition of the upper Paleozoic, Gondwana tillite in the Pensacola Mountains is indicated by low δ values of +4.9 to +6.1 permil δ0 1 8 (SMOW) and -1.8 to -15.9 permil δC1 3 (PDB) in primary sedimentary calcite within the tillite. In contrast, Cambrian marine limestone from the Pensacola...
Ralph P. Christian, G. Donald Eberlein, Judith A. Konnert
1974, Journal of Research of the U.S. Geological Survey (2) 699-700
Compositional, optical, and unit-cell data are presented for a suite of strontioginorites. These crystals show that Sr:Ca ≈ 1 is preferred. Lack of variation in the Sr:Ca resulted in no meaningful correlation between composition and physical properties....
Alden P. Colvocoresses
1974, Journal of Research of the U.S. Geological Survey (2) 763-764
The ERTS television sensing system has unique cartographic advantages over aircraft and satellite film systems. These are longer life combined with greater coverage, transmission of data in near real time, orthogonality, excellent geometric precision for planimetric mapping, suitability for automation (because of the basically continuous image on a mathematically definable...
Beth M. Madsen
1974, Journal of Research of the U.S. Geological Survey (2) 685-687
The spongy-textured surface in some cherts, visible on electron micrographs, is inherited from authigenic cristobalite. Spongy bedded cherts were originally bedded porcelanites similar to the porcelanite in the Miocene Monterey Formation of California....
E.T. Cleaves, D. W. Fisher, O.P. Bricker
1974, Geological Society of America Bulletin (85) 437-444
Weathering processes in a small watershed (Soldiers Delight) underlain by Serpentinite in the Piedmont of Maryland were studied by means of a mass balance technique and were compared with the processes operative in a watershed uncertain by schist. The two terranes are downwasting at a rate of 2.4 m per...
B.N. Troup, O.P. Bricker, J.T. Bray
1974, Nature (249) 237-239
Recent studies on the changes in composition of interstitial water during its separation from sediments1-3 prompted us to evaluate the effect of squeezing on the concentration of ferrous iron within the interstitial water. Sediment samples were taken in northern Chesapeake Bay (38°56′ N and 76°25′ W) with a Benthos gravity corer....
Robert A. Zielinski, Frederick A. Frey
1974, Geochimica et Cosmochimica Acta (38) 545-565
The partitioning of Gd in the experimental system diopside-aqueous vapor as a function of temperature, pressure, composition of the phases, time, grain size, solid-liquid ratio and Gd concentration has been investigated. A radioactive tracer measurement was used to determine Gd concentration in the separated phases. Diposides were reacted with aqueous...
Jack B. Epstein, W. D. Sevon, J. Douglas Glaeser
1974, Atlas 195cd
The Lehighton and Palmerton 73 1/2-minute quadrangles cover an area of about 112 square miles of diversified terrain in the folded Appalachian Mountain and Great Valley sections of the Valley and Ridge physiographic province in Carbon, Lehigh, and Northampton Counties, Pennsylvania. The Lehigh River and Blue Mountain are the prominent...
G. B. Dalrymple, M. A. Lanphere, E. D. Jackson
1974, GSA Bulletin (85) 727-738
Petrographic and chemical analyses of basalt from Nihoa Island, Necker Island, French Frigate Shoals, and Midway Atoll, all in the leeward part of the Hawaiian chain, confirm that these islands are subaerial remnants of tholeiitic shield volcanoes similar to those that form the principal Hawaiian Islands. Chemistry suggests that Gardner...
Gerhard W. Leo, Richard F. Marvin, Harald H. Mehnert
1974, Geological Society of America Bulletin (85) 1785-1788
The Kuluncak-Sofular area, located about midway between Sivas and Malatya in east-central Turkey is underlain by a variety of sedimentary, volcanic, and intrusive rocks. The sedimentary rocks have been deposited on a pre-Campanian serpentinite basement and include Cretaceous conglomerate, graywacke, tuff, and limestone; Eocene arkosic sandstone, conglomerate, and limestone; and...
M. Clark Blake Jr., D. L. Jones
1974, SEPM Special Publication 19
In northern California, chaotic Franciscan melange occurs beneath the overlying ophiolite and Great Valley Sequence. Identical melanges occur to the west, separating well-bedded, coherent Franciscan units that differ markedly in age. Detailed studies in several places indicate that these melanges mark the boundaries of imbricate thrust sheets, and they appear...
W. P. Irwin, E.W. Wolfe, M.C. Blake Jr., C.G. Cunningham
1974, Book chapter, Geologic guide to the southern Klamath Mountains: Geological Society of Sacramento, Annual Field Trip Guidebook
No abstract available....
Keith A. Howard, D.E. Wilhelms, D. H. Scott
1974, Reviews of Geophysics and Space Physics (12) 309-327
Multiring impact basins, formed after solidification of the lunar crust, account for most or all premare regional deposits and structures expressed in the lunar landscape and for major topographic and gravity variations. A fresh basin has two or more concentric mountain rings, a lineated ejecta blanket, and secondary impact craters....
Craig R. Allen, Jon Berger, Ivan I. Mueller, James C. Savage, J. Weertman
1974, Eos, Transactions, American Geophysical Union (55) 836-840
The Sixth Geodesy/Solid Earth and Ocean Physics (GEOP) Research Conwas held on February 4–5, 1974, at the Institute of Geophysics and Planetary Physics, University of California, San Diego, in La Jolla, California. It was attended by about 100 persons.James N. Brune, program chairman, opened the conference and delivered the introductory...
James C. Savage, W. T. Kinoshita, W.H. Prescott
1974, Bulletin of the Seismological Society of America (64) 115-129
Repeated surveys of a trilateration network (aperture greater than 20 km) centered on ground zero for the HANDLEY event, a nuclear explosion at the Nevada Test Site with yield in excess of 1 megaton, suggest that the explosion induced an east-west extension of the network by more than 50 mm....
W.H. Prescott, James C. Savage
1974, Bulletin of the Seismological Society of America (64) 65-72
Measurements of lines of the California Geodimeter network in the vicinity of the epicenters of four 1972 earthquakes (magnitudes 4.7, 4.7, 4.8, and 5.1) along the San Andreas fault system indicate that no significant anomalous changes in line length preceded or accompanied those earthquakes. Within the precision of measurement, the...
M. R. Klepper, G. D. Robinson, H.W. Smedes
1974, GSA Bulletin (85) 1953-1958
No abstract available. ...