Inverse problems for torsional modes.
C. Willis
1984, Geophysical Journal of the Royal Astronomical Society (78) 847-853
Considers a spherically symmetric, non-rotating Earth consisting of an isotropic, perfect elastic material where the density and the S-wave velocity may have one or two discontinuities in the upper mantle. Shows that given the velocity throughout the mantle and the crust and given the density in the lower mantle, then...
GEOLOGIC APPLICATIONS OF SIDE-LOOKING AIRBORNE RADAR DATA IN THE CENTRAL APPALACHIAN MOUNTAINS.
Howard A. Pohn, C. Scott Southworth
1984, Conference Paper
Side-looking airborne radar has provided a sufficiently detailed synoptic view of the central Appalachian Mountains that the images give an unparalleled representation of the size and nature of the folds within the Valley and Ridge province. The radar data show that fold wavelengths decrease abruptly south of the region of...
Lithotectonic assemblages as portrayed on the new bedrock geologic map of Massachusetts.
Norman L. Hatch Jr., E-An Zen, Richard Goldsmith, Nicholas M. Ratcliffe, Peter Robinson, Rolfe S. Stanley, David R. Wones
1984, American Journal of Science (284) 1026-1034
Scale of 1:250,000. The map units are grouped into eight lithotectonic packages. Five "zones" of older rocks that cover the whole state are, from west to east, the Taconic-Berkshire, Rowe-Hawley, Bronson Hill, Nashoba, and Milford-Dedham. In central and western Massachusetts, these zones are overlain by the Connecticut Valley and Merrimack...
Graphite sample preparation for AMS in a high pressure and temperature press
Meyer Rubin, Bjorn O. Mysen, Henry Polach
1984, Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms (5) 272-273
A high pressure-temperature press is used to make target material for accelerator mass spectrometry. Graphite was produced from typical **1**4C samples including oxalic acid and carbonates. Beam strength of **1**2C was generally adequate, but random radioactive contamination by **1**4C made age measurements impractical....
Holocene eruptive activity of El Chichón Volcano, Chiapas, Mexico
Robert I. Tilling, Meyer Rubin, Haraldur Sigurdsson, Steven Carey, Wendell A. Duffield, William I. Rose Jr.
1984, Science (224) 747-749
Geologic and radiometric-age data indicate that El Chichón was frequently and violently active during the Holocene, including eruptive episodes about 600, 1250, and 1700 years ago and several undated, older eruptions. These episodes, involving explosive eruptions of sulfur-rich magma and associated dome-growth processes, were apparently separated by intervals of approximately...
Lu-Hf and Sm-Nd evolution in lunar mare basalts
D.M. Unruh, P. Stille, P. J. Patchett, M. Tatsumoto
1984, Journal of Geophysical Research Solid Earth (89) B459-B477
Lu-Hf and Sm-Nd data for mare basalts combined with Rb-Sr and total REE data taken from the literature suggest that the mare basalts were derived by small (≤10%) degrees of partial melting of cumulate sources, but that the magma ocean from which these sources formed was light REE and Hf-enriched....
Magmatic inclusions in rhyolites, contaminated basalts, and compositional zonation beneath the Coso volcanic field, California
C. R. Bacon, J. Metz
1984, Contributions to Mineralogy and Petrology (85) 346-365
Basaltic lava flows and high-silica rhyolite domes form the Pleistocene part of the Coso volcanic field in southeastern California. The distribution of vents maps the areal zonation inferred for the upper parts of the Coso magmatic system. Subalkalic basalts (<50% SiO2) were erupted well away from the rhyolite field...
Post-fire recovery of California coastal sage scrub
Jon E. Keeley, Sterling C. Keeley
1984, American Midland Naturalist (111) 105-117
Postfire regeneration of the shrub and herb vegetation on eight coastal slopes of California coastal sage scrub was studied in the first two growing seasons after fire. All shrub species resprouted with the exception of the suffrutescent Lotus scoparius, though it is not known if this species was alive prior...
Lead poisoning of sandhill cranes (Grus canadensis)
R. M. Windingstad, S.M. Kerr, L. N. Locke, J. J. Hurt
1984, Prairie Naturalist (16) 21-24
Two wild and two captive sandhill cranes (Grus canadensis) were diagnosed by National Wildlife Health Laboratory personnel as having died from lead toxicity. Ingestion of lead fishing weights by the wild cranes and of unspent .22 caliber shell cartridges by the captive cranes were responsible for these deaths. One crane...
Reconnaissance geochemical assessment of metallic mineral resource potential, Riordan's Well Wilderness Study Area (NV 040-166), Nye County, Nevada
A. H. Hofstra, E. L. Rowan, G.W. Day
1984, Open-File Report 84-781
No abstract available....
Origin of epigenetic calcite in coal from Antarctica and Ohio based on isotope compositions of oxygen, carbon and strontium
G. Faure, G. Botoman
1984, Chemical Geology (46) 313-324
Isotopic compositions of oxygen, carbon and strontium of calcite cleats in coal seams of southern Victoria Land, Antarctica, and Tuscarawas County, Ohio, contain a record of the conditions a the time of their formation. The Antarctic calcites (?? 18O(SMOW) = +9.14 to +11.82%0) were deposited from waters enriched in 16O...
Periodic jökulhlaups from Pleistocene glacial Lake Missoula-New evidence from varved sediment in northern Idaho and Washington
Richard B. Waitt
1984, Quaternary Research (22) 46-58
Newly examined exposures in northern Idaho and Washington show that catastrophic floods from glacial Lake Missoula during late Wisconsin time were repeated, brief jökulhlaups separated by decades of quiet glaciolacustrine and subaerial conditions. Glacial Priest Lake, dammed in the Priest River valley by a tongue of the Purcell trench lobe...
Reconnaissance geochemical assessment of the Clover Mountains Bureau of Land Management Wilderness Study Area (NV-050-139), Lincoln County, Nevada
J. D. Hoffman, G.W. Day
1984, Open-File Report 84-654
No abstract available....
Speculations on the petroleum geology of the accretionary body: an example from the central Aleutians
J. McCarthy, A.J. Stevenson, D.W. Scholl, T.L. Vallier
1984, Marine and Petroleum Geology (1) 151-167
In the 300 km wide Adak-Amlia sector of the central Aleutian Trench ??? 36 000 km3 of offscraped trench fill makes up the wedge-shaped mass of the Aleutian accretionary body. Within this wedge, seismic reflection profiles reveal an abundance of potential hydrocarbon-trapping structures. These structures include antiforms, thrust and normal...
Ferromanganese nodules from MANOP Sites H, S, and R-Control of mineralogical and chemical composition by multiple accretionary processes
J. Dymond, M. Lyle, B. Finney, D.Z. Piper, K. Murphy, R. Conard, N. Pisias
1984, Geochimica et Cosmochimica Acta (48) 931-949
The chemical composition of ferromanganese nodules from the three nodule-bearing MANOP sites in the Pacific can be accounted for in a qualitative way by variable contributions of distinct accretionary processes. These accretionary modes are:1.(1) hydrogenous, i.e., direct precipitation or accumulation of colloidal metal oxides in seawater,2.(2)...
Renal coccidiosis in interior Canada geese, Branta canadensis interior Todd, of the Mississippi Valley population
Benjamin N. Tuggle, John L. Crites
1984, Journal of Wildlife Diseases (20) 272-278
Kidneys from 309 Interior Canada geese from three locations in the Mississippi Flyway were examined for renal coccidia. Oocysts and/or young zygotes of Eimeria sp. were found in 6.8% of goose kidneys sampled. Only one type of renal coccidian oocyst was observed. Significantly more immature...
Movement of tractive sediment from disturbed lands
W. R. Osterkamp, W. P. Carey, C.R. Hupp, B.A. Bryan
Schreiber David L., editor(s)
1984, Conference Paper
The Smoky Creek basin of the coal area of northeastern Tennessee shows extensive evidence of tractive movement of coarse sediment from mined tributary basins into the main channel. Coal-rich gravel bars and flood-plain debris are common below tributaries. Using a combination of techniques including channel-geometry and bar measurements, sediment sampling...
Bonded-phase extraction column isolation of organic compounds in groundwater at a hazardous waste site
C.E. Rostad, W. E. Pereira, S.M. Ratcliff
1984, Analytical Chemistry (56) 2856-2860
A procedure for isolation of hazardous organic compounds from water for gas chromatography/mass spectrometry analysis Is presented and applied to creosote- and pentachlorophenol-contaminated groundwater resulting from wood-treatment processes. This simple procedure involved passing a 50-100-mL sample through a bonded-phase extraction column, eluting the trapped organic compounds from the column with...
Radon in earth-sheltered structures
E. R. Landa
1984, Underground Space (8) 264-269
Radon concentration in the indoor air of six residential and three non-residential earth-sheltered buildings in eastern Colorado was monitored quarterly over a nine-month period using passive, integrating detectors. Average radon concentrations during the three-month sampling periods ranged from about 1 to 9 pCi/L, although one building, a poorly ventilated storage...
A Nd, Sr and O isotopic investigation into the causes of chemical and isotopic zonation in the Bishop Tuff, California
A. N. Halliday, A.E. Fallick, J. Hutchinson, W. Hildreth
1984, Earth and Planetary Science Letters (68) 379-391
The Bishop Tuff represents a single eruption of chemically zoned rhyolitic magma. Six whole rock samples spanning the compositional and temperature range yield initial87Sr/86Sr of 0.7060–0.7092 andδ18O of 5.9–10.3‰. Six constituent sanidines yield smaller ranges of initial87Sr/86Sr of 0.7061–0.7069 andδ18O of 6.7–7.9. In contrast143Nd/144Nd ratios for...
Geomagnetic paleointensities from excursion sequences in lavas on Oahu, Hawaii
Robert S. Coe, Sherman Gromme, Edward A. Mankinen
1984, Journal of Geophysical Research B: Solid Earth (89) 1059-1069
Paleomagnetic data demonstrating three late Tertiary excursions in the direction of the geomagnetic field recorded in sequences of basaltic lavas on the island of Oahu, Hawaii were published by R. R. Doell and G. B. Dalrymple in 1973. We have determined geomagnetic paleointensities by the Thelliers' method for 14 lavas...
The Jeanie Point complex revisited
Julie A. Dumoulin, Marti L. Miller
1984, Circular 868
The so-called Jeanie Point complex is a distinctive package of rocks within the Orca Group, a Tertiary turbidite sequence. The rocks crop out on the southeast coast of Montague Island, Prince William Sound, approximately 3 km northeast of Jeanie Point (loc. 7, fig. 44). These rocks consist dominantly of fine-grained...
Paleomagnetism in the Klamath Mountains, California and Oregon
William P. Irwin, Edward A. Mankinen, C. Sherman Gromme
D. G. Howell, D. L. Jones, A. Cox, A. Nur, editor(s)
1984, Stanford University Publications in Geological Science (18) 122-125
No abstract available....
Potential impacts of water diversion on fishery resources in the Great Lakes
Bruce A. Manny
1984, Fisheries (9) 19-23
Uses of Great Lakes water within the Great Lakes basin are steadily increasing, and critical water shortages elsewhere may add to the demands for diversions of water out of the basin in the near future. The impacts of such diversions on fish in the Great Lakes must be considered in...
Implications of paleomagnetism for the tectonic history of the Eastern Klamath and related terranes in California and Oregon
Edward A. Mankinen, William P. Irwin, C. Sherman Gromme
T. H. Nilsen, editor(s)
1984, Pacific Section S.E.P.M. (42) 221-229
Paleomagnetic study of Permian to Jurassic volcanic and sedimentary strata of the Eastern Klamath terrane has shown the remanent magnetism of these rocks to be prefolding and primary. The Permian and Triassic rocks are both indicated to have rotated 100° clockwise, while the Jurassic strata have rotated 60° clockwise. The...
