Zimbabweite, a new alkali-lead arsenic tantalate from St Anns mine, Karoi district, Zimbabwe
Eugene E. Foord, Joseph E. Taggart, R. V. Gaines, P. L .C. Grubb, R. Kristiansen
1986, Bulletin de Mineralogie (109) 331-336
Zimbabweite (Na,K)2PbAs4(Ta,Nb,Ti)4O18, a new mineral with trivalent arsenic, has been recognized at St Anns mine, southeast of Miami, Karoi district, Zimbabwe, in kaolinized pegmatite and dump material.The mineral is honey yellow-brown in large crystals, which are as much as 1 x 1 x 2 cm, and is clear pale yellow...
Precambrian basement geology of North and South Dakota
J. S. Klasner, E. R. King
1986, Canadian Journal of Earth Sciences (23) 1083-1102
Combined analysis of drill-hole, gravity, and magnetic data indicates that the buried Precambrian basement rocks of the Dakotas can be divided into several lithotectonic terranes. Eastern North Dakota and northeastern South Dakota are underlain by Archean gneiss. Except for the Black Hills region of South Dakota, where Archean rocks are...
Fluid inclusion from drill hole DW-5, Hohi geothermal area, Japan: Evidence of boiling and procedure for estimating CO2 content
M. Sasada, E. Roedder, H. E. Belkin
1986, Journal of Volcanology and Geothermal Research (30) 231-251
Fluid inclusion studies have been used to derive a model for fluid evolution in the Hohi geothermal area, Japan. Six types of fluid inclusions are found in quartz obtained from the drill core of DW-5 hole. They are: (I) primary liquid-rich with evidence of boiling; (II) primary liquid-rich without evidence...
Upper Pleistocene and Holocene lakes in the An Nafud, Saudi Arabia
E. Schulz, J.W. Whitney
1986, Hydrobiologia (143) 175-190
Two major lake periods were discovered in the sand sea of An Nafud and the surrounding areas. In Upper Pleistocene large lakes occurred around the dune area and in the interior of the sand sea. Their deposits were formed between 34 000 and 24 000 BP. The lakes were not...
Magnesioferrite from the Cretaceous-Tertiary boundary, Caravaca, Spain
B.F. Bohor, E.E. Foord, R. Ganapathy
1986, Earth and Planetary Science Letters (81) 57-66
Magnesioferrite grading toward magnetite has been identified as a very small but meaningful constituent of the basal iron-rich portion of the Cretaceous-Tertiary (K-T) boundary clay at the Barranco del Gredero section, Caravaca, Spain. This spinel-type phase and others of the spinel group, found in K-T boundary clays at many widely...
Vegetation, climatic and floral changes at the Cretaceous-Tertiary boundary
J. A. Wolfe, G.R. Upchurch Jr.
1986, Nature (324) 148-152
he western interior of North America has the only known non-marine sections that contain the iridium-rich clay interpreted as the Cretaceous-Tertiary (K-T) boundary1-7. Because vegetation and climate can be directly inferred from physiognomy of leaves8-15 and because leaf species typically represent low taxonomic categories, studies of leaf floras in these...
Local Magnetic Fields, Uplift, Gravity, and Dilational Strain Changes in Southern California
M.J.S. Johnston
1986, Journal of Geomagnetism & Geoelectricity (38) 933-947
Measurements of regional magnetic field during gravity, strain and leveling surveys near the San Andreas fault at Cajon, Palmdale and Tejon are strongly correlated with changes in gravity, areal strain, and uplift in these regions during the period 1977-1984. This correlation principally depends on data taken during 1978-79...
Recovering fresh water stored in saline limestone aquifers
M. L. Merritt
1986, Ground Water (24) 516-529
Numerical modeling techniques are used to examine the hydrogeologic, design, and management factors governing the recovery efficiency of subsurface fresh-water storage. The modeling approach permitted many combinations of conditions to be studied. A sensitivity analysis was used that consisted of varying certain parameters while keeping constant as many other parameters...
Shallow subsurface temperature surveys in the Basin and Range province, U.S.A.-I. Review and evaluation
F. H. Olmsted, A. H. Welch, S. E. Ingebritsen
1986, Geothermics (15) 251-265
Temperature surveys at depths of 1–2 m have had varying success in geothermal exploration in the Basin and Range province. The most successful surveys have identified patterns of near-surface thermal-fluid flow within areas of less than 2 km2. Results have been less consistent in larger areas where zones of hydrothermal...
Evidence for equilibrium conditions during the partitioning of nickel between olivine and komatiite liquids.
J. R. Budahn
1986, American Mineralogist (71) 1337-1342
Olivine-liquid partition coefficients for Ni(DNi), calculated from Ni vs MgO abundance variations in komatiite series basalts, compare favourably with experimentally determined values, if Ni variations in olivine-controlled basalts can be modelled with an equation that assumes equilibrium between the entire olivine crystal and its coexisting liquid.-J.A.Z....
Radarclinometry
R.L. Wildey
1986, Earth, Moon and Planets (36) 217-247
A mathematical theory and a corresponding algorithm have been developed to derive topographic maps from radar images as photometric arrays. Thus, as radargrammetry is to photogrammetry, so radarclinometry is to photoclinometry. Photoclinometry is endowed with a fundamental indeterminacy principle even for terrain homogeneous in normal albedo. This arises from the...
Long-term water-quality characteristics of Charlotte Harbor, Florida
T. H. Fraser
1986, Water-Resources Investigations Report 86-4180
Water-quality data for nine constituents collected from January 1976 through March 1984 in upper Charlotte Harbor were examined for evidence of trend (change) with time. Average seasonal patterns and moving averages were described to aid initial descriptions of variation. Multilinear regression models were developed using independent variables that are known...
Ground-water resource assessment of the Montauk area, Long Island, New York
K. R. Prince
1986, Water-Resources Investigations Report 85-4013
The water resources of the Montauk area were investigated from October 1980 through September 1983 to assess the availability of fresh groundwater. The principal aquifer, which consists of fine- to coarse-grained stratified glacial drift, is the sole source of freshwater. The freshwater/saltwater interface lies as much as 150 ft below...
Effects of urbanization on streamflow, sediment loads, and channel morphology in Pheasant Branch basin near Middleton, Wisconsin
W.R. Krug, G. L. Goddard
1986, Water-Resources Investigations Report 85-4068
A 5-year, data-collection and modeling study was conducted on Pheasant Branch basin in and near Middleton, Wisconsin. The objectives of the study were to: (1) describe the streamflow characteristics, sediment transport, and stream-channel morphology in the Pheasant Branch basin; and (2) relate the above factors to changes caused by urbanization...
Hydrogeologic framework of the Floridan aquifer system in Florida and in parts of Georgia, Alabama, and South Carolina
James A. Miller
1986, Professional Paper 1403-B
The Floridan aquifer system of the Southeastern United States is comprised of a thick sequence of carbonate rocks that are mostly of Paleocene to early Miocene age and that are hydraulically connected in varying degrees. The aquifer system consists of a single vertically continuous permeable unit updip and of two...
Effect of height and orientation (microclimate) on geomorphic degradation rates and processes, late-glacial terrace scarps in central Idaho
K. L. Pierce, Steven M. Colman
1986, Geological Society of America Bulletin (97) 869-885
Skip Nav DestinationRESEARCH ARTICLE| JULY 01, 1986Effect of height and orientation (microclimate) on geomorphic degradation rates and processes, late-glacial terrace scarps in central Idaho <i...
The boundary model: A geographical analysis of design and conservation of nature reserves
C. Schonewald-Cox, J.W. Bayless
1986, Biological Conservation (38) 305-322
It is widely recognised that nearly all parks and reserves are too small to protect their biological diversity. In response to this problem, we have been developing a multidisciplinary ‘boundary model’ that focuses upon the processes of exchange across the administrative edges of nature reserves. The model incorporates known dynamics...
Effects of shrub coverages on birds of North Dakota mixed-grass prairies
T.W. Arnold, K.F. Higgins
1986, Canadian Field-Naturalist (100) 10-14
We studied the distribution and density of passerine birds in relation to Wolfberry (Symphoricarpos occidentalis) and Silverberry (Elaeagnus commutata) shrub coverages on mixed-grass prairies of central North Dakota. Birds were counted along shrubby and shrubless transects during the 1982 breeding season. Species richness and total density of birds were greater...
Late Cenozoic Arctic Ocean sea ice and terrestrial paleoclimate
L. D. Carter, J. Brigham-Grette, L. Marincovich Jr., V.L. Pease, John W. Hillhouse
1986, Geology (14) 675-678
Sea otter remains found in deposits of two marine transgressions (Bigbendian and Fishcreekian) of the Alaskan Arctic Coastal Plain which occurred between 2.4 and 3 Ma suggest that during these two events the southern limit of seasonal sea ice was at least 1600...
Seed predation by yucca moths on semelparous, iteroparous and vegetatively reproducing subspecies of Yucca whipplei (Agavaceae)
Jon E. Keeley, Sterling C. Keeley, D. A. Ikeda
1986, American Midland Naturalist (115) 1-9
Yucca whipplei subspecies are distinguished by differences in reproduction: spp. whipplei and ssp. parishii are semelparous, flowering once and dying; ssp. caespitosa is iteroparous, producing multiple rosettes which may flower in different years; ssp. percursa has clonal reproduction from rhizomes, and ssp. intermedia is intermediate to the latter two. Seed...
Habitat suitability index models: northern pintail (Gulf Coast wintering)
R.J. Howard, H.A. Kantrud
1986, Biological Report 82(10.121)
Computer program calculation of gas supersaturation in water
V. K. Dawson
1986, Progressive Fish-Culturist (48) 142-146
A short computer program, written in BASIC for the Apple IIe or IBM PC computer, efficiently performs all the calculations required to determine gas pressure and percent saturation values for water. Input for the program is limited to empirical determinations of barometric pressure, water temperature, differential dissolved gas pressures, dissolved...
Modelling the transport of stored sediment in a gravel-bed river, northwestern California
H.M. Kelsey, R. Lamberson, Mary Ann Madej
1986, Publication 159
No abstract available at this time...
Winter ecology of bald eagles in southcentral Nebraska
G.R. Lingle, Gary L. Krapu
1986, Prairie Naturalist (18) 65-78
Approximately 200 bald eagles wintered along a 370-km section of the Platte and North Platte rivers in Nebraska during the winters of 1978-79 and 1979-80. A preponderance of the wintering eagles were adults, with the adult:subadult ratio highest during the harsh winter of 1978-79. Nocturnal roosts were located primarily in...
A professional umbrella for the 80s: Report of the 1983-84 Professionalism Committee
C.F. Cole, C. Griswold, V. Henderson, E. Hester, T. Modde, R.L. Noble, G. Pardue, N. C. Parker, D.C. Peterson, W.F. Royce
1986, Fisheries (11) 22-28
No abstract available....
