Hydrogeochemical exploration of geothermal prospects in the Tecuamburro Volcano region, Guatemala
C. J. Janik, F. Goff, L. Fahlquist, A.I. Adams, Roldan M. Alfredo, S.J. Chipera, P.E. Trujillo, D. Counce
1992, Geothermics (21) 447-481
Chemical and isotopic analyses of thermal and nonthermal waters and of gases from springs and fumaroles are used to evaluate the geothermal potential of the Tecuamburro Volcano region, Guatemala. Chemically distinct geothermal surface manifestations generally occur in separate hydrogeologic areas within this 400 km2 region: low-pressure fumaroles with temperatures near local...
Energy, time, and channel evolution in catastrophically disturbed fluvial systems
A. Simon
1992, Geomorphology (5) 345-372
Two diverse fluvial systems show that with time, channels adjust such that the rate of energy dissipation is minimized. One fluvial system, characterized by high relief and coarse-grained sediment, was subjected to an explosive volcanic eruption; the other system, characterized by low relief and fine-grained sediment, was subjected to dredging...
A petroleum discovery-rate forecast revisited-The problem of field growth
L.J. Drew, J.H. Schuenemeyer
1992, Nonrenewable Resources (1) 51-60
A forecast of the future rates of discovery of crude oil and natural gas for the 123,027-km2 Miocene/Pliocene trend in the Gulf of Mexico was made in 1980. This forecast was evaluated in 1988 by comparing two sets of data: (1) the actual versus the forecasted number of fields discovered,...
Quantitative assessment of mineral resources with an application to petroleum geology
Jan Harff, J.C. Davis, Ricardo A. Olea
1992, Nonrenewable Resources (1) 74-84
The probability of occurrence of natural resources, such as petroleum deposits, can be assessed by a combination of multivariate statistical and geostatistical techniques. The area of study is partitioned into regions that are as homogeneous as possible internally while simultaneously as distinct as possible. Fisher's discriminant criterion is used to...
Louisiana hydrologic atlas map no. 5: Quality of freshwater in aquifers of Louisiana, 1988
Dan J. Tomaszewski
1992, Water-Resources Investigations Report 90-4119
No abstract available....
Factors controlling the major ion chemistry of streams in the Blue Ridge and Valley and Ridge physiographic provinces of Virginia and Maryland
L.J. Puckett, O.P. Bricker
1992, Hydrological Processes (6) 79-98
The factors controlling the chemistry of 69 low-order streams in the Blue Ridge and Valley and Ridge physiographic provinces of Virginia and Maryland were studied over a 13-month period. Principal component analysis was used to examine regional patterns in stream chemistry and to examine...
The Mauna Loa environmental matrix: foliar and soil nutrients
P.M. Vitousek, G. Aplet, D. Turner, J.J. Lockwood
1992, Oecologia (89) 372-382
The accumulation of total carbon, nitrogen, and phosphorus in soils, available soil nutrients, and foliar nutrients in the native dominant Metrosideros polymorpha were determined across a wide elevational range on 9 lava flows on Mauna Loa, Hawai'i. The flows included a young (2800 y) a??a??...
Geotechnical properties and preliminary assessment of sediment stability on the continental slope of the northwestern Alboran Sea
J. Baraza, G. Ercilla, H.J. Lee
1992, Geo-Marine Letters (12) 150-156
Laboratory analysis of core samples from the western Alboran Sea slope reveal a large variability in texture and geotechnical properties. Stability analysis suggests that the sediment is stable under static gravitational loading but potentially unstable under seismic loading. Slope failures may occur if horizontal ground accelerations greater than 0.16 g...
Seismic excitation by space shuttles
H. Kanamori, J. Mori, B. Sturtevant, D.L. Anderson, T. Heaton
1992, Shock Waves (2) 89-96
Shock waves generated by the space shuttles Columbia (August 13, 1989), Atlantis (April 11, 1991) and Discovery (September 18, 1991) on their return to Edwards Air Force Base, California, were recorded by TERRAscope (Caltech's broadband seismic network), the Caltech-U.S.G.S Southern California Seismic Network (SCSN), and the University of Southern California...
15N and13C NMR investigation of hydroxylamine-derivatized humic substances
K. A. Thorn, J.B. Arterburn, M.A. Mikita
1992, Environmental Science & Technology (26) 107-116
No abstract available....
Multispectral thermal infrared mapping of the 1 October 1988 Kupaianaha flow field, Kilauea volcano, Hawaii
V.J. Realmuto, K. Hon, A.B. Kahle, E.A. Abbott, D.C. Pieri
1992, Bulletin of Volcanology (55) 33-44
Multispectral thermal infrared radiance measurements of the Kupaianaha flow field were acquired with the NASA airborne Thermal Infrared Multispectral Scanner (TIMS) on the morning of 1 October 1988. The TIMS data were used to map both the temperature and emissivity of the surface of the flow field. The temperature map...
Morphology and genesis of carbonate soils on the Kyle Canyon fan, Nevada, U.S.A.
M.C. Reheis, J.M. Sowers, E. M. Taylor, L. D. McFadden, J.W. Harden
1992, Geoderma (52) 303-342
The physical and chemical properties of soils formed in an arid climate on calcareous alluvium of the Kyle Canyon alluvial fan, southern Nevada, were studied in order to infer the rates and relative importance of various soil-forming processes. These studies included field and microscopic observations and analyses of thin sections,...
Energy budgets and resistances to energy transport in sparsely vegetated rangeland
William D. Nichols
1992, Agricultural and Forest Meteorology (60) 221-247
Partitioning available energy between plants and bare soil in sparsely vegetated rangelands will allow hydrologists and others to gain a greater understanding of water use by native vegetation, especially phreatophytes. Standard methods of conducting energy budget studies result in measurements of latent and sensible heat fluxes above the plant canopy...
Accretionary margin of north-western Hispaniola: morphology, structure and development of part of the northern Caribbean plate boundary
William P. Dillon, James A. Austin Jr., Kathryn M. Scanlon, Edgar N. Terence, L.M. Parson
1992, Marine and Petroleum Geology (9)
Broad-range side-scan sonar (GLORIA) images and single- and multi-channel seismic reflection profiles demonstrate that the margin of north-western Hispaniola has experienced compression as a consequence of oblique North American-Caribbean plate convergence. Two principal morphological or structural types of accretionary wedges are observed along this margin. The first type is characterized...
Progress report on the Worldwide Earthquake Risk Management (WWERM) Program
S. T. Algermissen, Walter W. Hays, Paul R. Krumpe
1992, Conference Paper, NIST Special Publication
Considerable progress has been made in the Worldwide Earthquake Risk Management (WWERM) Program since its initiation in late 1989 as a cooperative program of the Agency for International Development (AID), Office of U.S. Foreign Disaster Assistance (OFDA), and the U.S. Geological Survey. Probabilistic peak acceleration and peak Modified Mercalli intensity...
Seasonal dynamics of groundwater-lake interactions at Doñana National Park, Spain
Laura A. Sacks, Janet S. Herman, Leonard F. Konikow, Antonio L. Vela
1992, Journal of Hydrology (136) 123-154
The hydrologic and solute budgets of a lake can be strongly influenced by transient groundwater flow. Several shallow interdunal lakes in southwest Spain are in close hydraulic connection with the shallow ground water. Two permanent lakes and one intermittent lake have chloride concentrations that differ by almost an order of...
Gravel-bed deposition and erosion by bedform migration observed ultrasonically during storm flow, North Fork Toutle River, Washington
R.L. Dinehart
1992, Journal of Hydrology (136) 51-71
Ultrasonic depth sounding provides useful and unexpected information about peak discharge and sediment transport when applied during storm flow in channels with erodible beds. Streambed elevation was measured with dual ultrasonic depth sounders during the rise, crest, and recession of a storm flow in the North Fork Toutle River,...
The influence of pH on biotite dissolution and alteration kinetics at low temperature
James G. Acker, O.P. Bricker
1992, Geochimica et Cosmochimica Acta (56) 3073-3092
Biotite dissolution rates in acidic solutions were determined in fluidized-bed reactors and flowthrough columns. Biotite dissolution rates increased inversely as a linear function of pH in the pH range 3–7, where the rate order n = −0.34. Biotite dissolved incongruently over this pH range, with preferential release of magnesium and iron from...
Hydrous pyrolysis of crude oil in gold-plated reactors
J.A. Curiale, P.D. Lundegard, Y.K. Kharaka
1992, Organic Geochemistry (18) 745-756
Crude oils from Iraq and California have been pyrolyzed under hydrous conditions at 200 and 300°C for time periods up to 210 days, in gold-plated reactors. Elemental (vanadium, nickel), stable isotopic (carbon), and molecular (n-alkanes, acyclic isoprenoids, steranes, terpanes and aromatic steroid hydrocarbons) analyses were made on the original and...
Uranium-series isochron dating at El Castillo Cave (Cantabria, Spain): The "Acheulean"/"Mousterian" question
J. L. Bischoff, Jose Francisco Garcia, L.G. Straus
1992, Journal of Archaeological Science (19) 49-62
A massive flowstone layer, Level 23, near the base of the stratigraphic sequence in El Castillo Cave (Cantabria, Spain), is dated by the uranium-series isochron method to 89+11/−10 ka bp. The flowstone separates cultural layers traditionally labelled “Mousterian” (above) and “Acheulean” (below). The date reported here, in association with other...
Peat accumulation in coastal-plain mires: A model for coals of the Fruitland Formation (Upper Cretaceous) of southern Colorado, USA
Roberts L. N. Robinson, P.J. McCabe
1992, International Journal of Coal Geology (21) 115-138
In the northwestern part of the San Juan basin, Colorado, thick high-volatile B bituminous coal deposits in the Upper Cretaceous Fruitland Formation are associated with nearshore marine sandstones of the Pictured Cliffs Sandstone. Detailed work along the outcrop and examination of...
Anomalous abundances of deep-sea fauna on a rocky bottom exposed to strong currents
A. Genin, C. K. Paull, William P. Dillon
1992, Deep Sea Research Part A, Oceanographic Research Papers (39) 293-302
Unusually high abundances of sponges and gorgonian corals, covering as much as 25% of the bottom, occur at depths greater than 3.5 km on the Blake Spur, a rocky cliff-dominated feature on the western Atlantic continental margin. This is the first report of such high abundances of megafauna from a...
Redistribution of soil nitrogen, carbon and organic matter by mechanical disturbance during whole-tree harvesting in northern hardwoods
D.F. Ryan, Thomas G. Huntington, Martin C. Wayne
1992, Forest Ecology and Management (49) 87-99
To investigate whether mechanical mixing during harvesting could account for losses observed from forest floor, we measured surface disturbance on a 22 ha watershed that was whole-tree harvested. Surface soil on each 10 cm interval along 81, randomly placed transects was classified immediately after harvesting as mineral or organic, and...
Garnet/high-silica rhyolite trace element partition coefficients measured by ion microprobe
Thomas W. Sisson, Charles R. Bacon
1992, Geochimica et Cosmochimica Acta (56) 2133-2136
Garnet/liquid trace element partition coefficients have been measured in situ by ion microprobe in a rhyolite from Monache Mountain, California. Partition coefficients are reported for La, Ce, Nd, Sm, Dy, Er, Yb, Sc, Ti, V, Cr, Sr, Y, and Zr. The in situ analyses avoid the problem of contamination of...
Mass transfer constraints on the chemical evolution of an active hydrothermal system, Valles caldera, New Mexico
A. F. White, N.J. Chuma, F. Goff
1992, Journal of Volcanology and Geothermal Research (49) 233-253
Partial equilibrium conditions occur between fluids and secondary minerals in the Valles hydrothermal system, contained principally in the Tertiary rhyolitic Bandelier Tuff. The mass transfer processes are governed by reactive phase compositions, surface areas, water-rock ratios, reaction rates, and fluid residence times. Experimental dissolution of the vitric phase of the...
