Partitioning Curves Research Articles

Late Ordovician Bentonites From the Southern Ordos Basin: Response to the Subduction of the Proto‐Tethys Ocean

ABSTRACTThe connection between the Ordovician bentonites on the southern margin of the Ordos Basin and the Early Palaeozoic volcanic rocks of the North Qinling Orogenic Belt is crucial for understanding the subduction and collisional closure of the Shangdan Ocean during the Early Palaeozoic. This paper investigates zircon U–Pb ages, geochemistry and Lu–Hf isotopic compositions of zircons in the Upper Ordovician Zhaolaoyu Formation bentonites located on the southern margin of the Ordos Basin. U–Pb dating of zircon indicates a coeval age of 453.3 ± 1.4 Ma (MSWD = 0.99), which represents the crystallisation age during the Late Ordovician Katian stage. The bentonites exhibit higher SiO2 (57.94–77.95 wt.%) and Al2O3 (9.21–14.33 wt.%), classifying them within the low‐potassium alkali basalt to medium‐potassium calc‐alkaline series. The parent rock of the bentonites is likely intermediate to felsic volcanic rocks. The rare earth element partitioning curves of the bentonites are right‐dipping, with a more pronounced negative Eu anomaly (δEu = 0.48–0.67). The zircons in the bentonites yield two‐stage model ages ranging from 546 to 956 Ma, along with εHf(t) values between 5.56 and 13.55. These results indicate that the bentonites are products of volcanic arc magma formed in a subduction–collision environment. The interbedded bentonites in the Upper Ordovician limestones of the southern margin of the Ordos Basin may be associated with the northward subduction of the Shangdan Oceanic crust, reflecting the subduction and consumption of the Proto‐Tethys Ocean along the southern margin of the North China Block.

Thermodynamic mixing properties of disordered alkali feldspar solid-solution from Na–K partitioning and low-temperature calorimetry

The equilibrium partitioning of Na and K between alkali feldspar and NaCl–KCl salt melt was determined at 800 ∘\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$^\\circ$$\\end{document}C, 850 ∘\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$^\\circ$$\\end{document}C, 900 ∘\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$^\\circ$$\\end{document}C, 950 ∘\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$^\\circ$$\\end{document}C and 1000 ∘\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$^\\circ$$\\end{document}C and close to ambient pressure. Four different natural gem-quality alkali feldspars with low degree of Al–Si ordering covering the range from orthoclase to high sanidine and with slightly different minor element concentrations were used as starting materials. The partitioning curves obtained for the four feldspars are indistinguishable indicating that Na–K partitioning independent of the differences of Al–Si ordering state and minor element concentrations existing amongst these feldspars. A sub-regular two parameter Margules type solution model was fitted to the partitioning data, and the excess Gibbs energy describing the thermodynamic non-ideality of the alkali feldspar solid-solution and the respective Margules parameters WgK\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$W_{\ ext {g}\ ext {K}}$$\\end{document} and Wg\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$W_{\ ext {g}\ ext {Na}}$$\\end{document} including their temperature dependence expressed as Wg=Wh-TWs\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$W_g=W_h-TW_s$$\\end{document} were determined: WgK=19754±3140J·mol-1-T·2.33±2.67J·mol-1·K-1Wg=14916±4272J·mol-1-T·3.55±3.64J·mol-1·K-1\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$\\begin{aligned} W_{\ ext {g}\ ext {K}}&= 19754 \\pm 3140 J\\cdot \\,\\,{\\hbox {mol}}\\,\\,^{-1} - T \\cdot 2.33 \\pm 2.67 J\\cdot \\,\\,{\\hbox {mol}}\\,\\,^{-1}\\cdot K^{-1} \\\\ W_{\ ext {g}\ ext {Na}}&= 14916 \\pm 4272 J\\cdot \\,\\,{\\hbox {mol}}\\,\\,^{-1} - T \\cdot 3.55 \\pm 3.64 J\\cdot {\\hbox {mol}}\\,\\,^{-1}\\cdot K^{-1} \\\\ \\end{aligned}$$\\end{document}The corresponding solvus has a critical temperature slightly above 650 ∘\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$^\\circ$$\\end{document}C and is well comparable with earlier direct experimental determinations of the low-sanidine-albite solvus curve. Comparison of the vibrational excess entropy determined from low-temperature heat capacity measurements with the total excess entropy derived from the temperature dependence of the excess Gibbs energy yields a negative configurational contribution to the excess entropy pointing towards short-range Na–K ordering on the alkali site.

Variation of Runoff and Runoff Components of the Lhasa River Basin in the Qinghai-Tibet Plateau under Climate Change

Quantitative analysis of changes in Lhasa River runoff components was significant to local water resources management. This study constructed the spatial processes in hydrology (SPHY) model in the Lhasa River Basin and optimized the model’s parameters using the hydrograph partitioning curves (HPC) method. The Lhasa River Basin’s precipitation and temperature were forecasted for 2020 to 2100 using the statistical downscaling model (SDSM) and two scenarios from the fifth generation of the Canadian earth system model (CanESM5) dataset, shared socioeconomic pathways 1-2.6 (SSP1-2.6) and shared socioeconomic pathways 2-4.5 (SSP2-4.5). This study analyzed the potential changes in Lhasa River runoff and components based on the future climate. The results showed that the Lhasa River runoff from 2010 to 2019 was composed of snowmelt runoff, glacier melt runoff, rainfall runoff, and baseflow, with the proportions of 15.57, 6.19, 49.98, and 28.26%, respectively. From 2020 to 2100, under the SSP1-2.6 scenario, the precipitation and average temperature increased by 0.76mm and 0.08 °C per decade. Under the SSP2-4.5 scenario, the increasing rate was 3.57 mm and 0.25 °C per decade. Due to the temperature increase, snowmelt and glacier melt runoff showed a decreasing trend. The decline rate of total runoff was 0.31 m3/s per year under the SSP1-2.6 scenario due to the decrease in baseflow. Under the SSP2-4.5 scenario, total runoff and rainfall runoff showed a clear increasing trend at an average rate of 1.13 and 1.16 m3/s per year, respectively, related to the significant increase in precipitation. These conclusions suggested that climate change significantly impacted the Lhasa River’s total runoff and runoff components.

Leaching characteristics of alkaline coal combustion by-products: A case study from a coal-fired power plant, Hebei Province, China

In recent years, coal combustion by-products have attracted much attention because of their large production volume, adverse environmental effects of potentially toxic elements, and as potential sources of critical metals. In order to better evaluate the leaching characteristics of alkaline coal combustion by-products, the Leaching Environment Assessment Framework (LEAF) proposed by the United States Environmental Protection Agency was adopted in this study. Depending upon the properties of the samples, the test methods used in this paper mainly included Methods 1313, 1314, and 1316. The liquid-solid partitioning curves of samples were drawn according to the results of chemical analysis. Samples were collected from the coal-fired Sunzhuang Power Plant, Hebei Province, China. The leaching characteristics of coal combustion by-products are discussed from three aspects: pH values, liquid--solid ratios, and accumulated liquid-solid ratios. According to the trend of the liquid-solid partitioning curves, the modes of occurrence and causes of mobility of trace elements in the coal combustion by-products are discussed. To assess the potential environmental risk of hazardous elements leached from coal combustion by-products, the maximum leaching values of hazardous elements were compared to the upper limit value of the Type III Chinese groundwater quality standard, suggesting that in the eluates of Method 1313, arsenic, selenium, beryllium, thallium, nickel, and lead contents in the eluates of fly ash and bottom ash exceed the recommended upper limit. However, in the eluates of Methods 1314 and 1316, selenium, molybdenum, barium, and nickel exceed the recommended upper limit.

Domain-Dependent Stability Analysis of a Reaction–Diffusion Model on Compact Circular Geometries

In this work an activator-depleted reaction–diffusion system is investigated on polar coordinates with the aim of exploring the relationship and the corresponding influence of domain size on the types of possible diffusion-driven instabilities. Quantitative relationships are found in the form of necessary conditions on the area of a disk-shape domain with respect to the diffusion and reaction rates for certain types of diffusion-driven instabilities to occur. Robust analytical methods are applied to find explicit expressions for the eigenvalues and eigenfunctions of the diffusion operator on a disk-shape domain with homogenous Neumann boundary conditions in polar coordinates. Spectral methods are applied using Chebyshev nonperiodic grid for the radial variable and Fourier periodic grid for the angular variable to verify the nodal lines and eigen-surfaces subject to the proposed analytical findings. The full classification of the parameter space in light of the bifurcation analysis is obtained and numerically verified by finding the solutions of the partitioning curves inducing such a classification. Spatiotemporal periodic behavior is demonstrated in the numerical solutions of the system for a proposed choice of parameters and a rigorous proof of the existence of infinitely many such points in the parameter plane is presented under a restriction on the area of the domain, with a lower bound in terms of reaction–diffusion rates.

The Value of Hydrograph Partitioning Curves for Calibrating Hydrological Models in Glacierized Basins

AbstractThis study refines the method for calibrating a glacio‐hydrological model based on Hydrograph Partitioning Curves (HPCs), and evaluates its value in comparison to multidata set optimization approaches which use glacier mass balance, satellite snow cover images, and discharge. The HPCs are extracted from the observed flow hydrograph using catchment precipitation and temperature gradients. They indicate the periods when the various runoff processes, such as glacier melt or snow melt, dominate the basin hydrograph. The annual cumulative curve of the difference between average daily temperature and melt threshold temperature over the basin, as well as the annual cumulative curve of average daily snowfall on the glacierized areas are used to identify the starting and end dates of snow and glacier ablation periods. Model parameters characterizing different runoff processes are calibrated on different HPCs in a stepwise and iterative way. Results show that the HPC‐based method (1) delivers model‐internal consistency comparably to the tri‐data set calibration method; (2) improves the stability of calibrated parameter values across various calibration periods; and (3) estimates the contributions of runoff components similarly to the tri‐data set calibration method. Our findings indicate the potential of the HPC‐based approach as an alternative for hydrological model calibration in glacierized basins where other calibration data sets than discharge are often not available or very costly to obtain.

The effect of variable liposome brightness on quantifying lipid–protein interactions using fluorescence correlation spectroscopy

Fluorescence correlation spectroscopy (FCS) has been increasingly used to study the binding of fluorescently-labeled peptides and proteins to phospholipid vesicles. In this work, we present a new method to analyze partition data obtained by this technique based on the assumption that the number of fluorescently-labeled protein molecules bound per liposome follows a Poisson distribution. To not overestimate the recovered partition coefficients, we first show that the variation in liposome brightness caused by this statistical distribution must be considered explicitly in data analysis when the parameter used to establish the partition curves is the fractional instead of the absolute amplitudes associated with the slowest diffusing particles in the system (lipid vesicles), a choice frequently made in FCS partition studies. We further extend the theoretical model describing the membrane partition of a fluorescently-labeled protein by considering the presence of a trace amount of free fluorescent dye (non-binding component) in the system. We show that this situation can account for an apparent maximal binding level lower than 100% in the experimental partitioning curves obtained for Alexa 488 fluorescently-labeled lysozyme and liposomes prepared with variable anionic phospholipid content. The extreme sensitivity of the FCS technique allowed uncoupling lysozyme partition from the protein-induced liposome aggregation, confirming that lysozyme binding to negatively charged liposomes is dominantly driven by electrostatic interactions.

Quantifying Protein Binding to Lipid Vesicles Using Fluorescence Correlation Spectroscopy (FCS)

Quantitative evaluation of protein binding to liposomes through the determination of their partition coefficient (Kp) is an important step in any lipid-protein interaction study because it allows the calculation of protein interfacial coverage of the lipid vesicles, often the critical parameter controlling the protein membrane binding mode (peripheral vs partial insertion) and/or its oligomerization state. In this study, the application of fluorescence correlation spectroscopy (FCS) technique to investigate the binding of protein molecules to phospholipid vesicles is presented. We have found that the type of fitting function used in the analysis of the experimental AC curves obtained in a partitioning experiment strongly influences the final recovered partition coefficients. We show that if the parameter chosen to establish the partition curves of the fluorescent peptide/ protein is the fractional amplitude associated with the slowest diffusing particles in the system (lipid vesicles) then it is necessary to consider explicitly the statistical (Poissonian) distribution of the fluorescently-labeled protein among the ensemble of lipid vesicles in the fitting procedure to not overestimate the determined Kp values. We have extended this analytical model by considering the presence of a trace amount of free fluorescent dye (nonbinding component) in the system to account for an apparent maximum binding level less than 100% in the experimental partitioning curves obtained for Alexa 488 fluorescently-labeled lysozyme and liposomes prepared with variable anionic phospholipid content. The extreme sensitivity of the FCS technique allowed uncoupling lysozyme partition from the protein-induced liposome aggregation, confirming that lysozyme binding to negatively charged liposomes is dominantly driven by electrostatic interactions.

Modeling of gold scavenging by bismuth melts coexisting with hydrothermal fluids

The effect of gold scavenging by bismuth melts is investigated using equilibrium thermodynamic modeling of an aqueous solution–mineral–melt system. The calculations for the Au-Bi-Na-Cl-S-H-O system, performed at temperatures between 300 and 450 °C, demonstrate that Au concentrations in the melt are several orders of magnitude higher than in the coexisting fluid, indicating the possible formation of economic gold deposits from undersaturated aqueous fluids, in which mineralization would not be expected in the absence of a bismuth melt. The model applies to any deposit where a Bi melt is stable and coexists with a hydrothermal fluid; examples of such deposits are known from skarn, intrusion-related, orogenic, and volcanogenic massive sulfide (VMS) gold systems. In sulfur-poor systems the partitioning curves presented here can be used directly to correlate the gold concentration in the fluid and the Au grade in the ore (e.g., Escanaba Trough VMS deposit). These results also illustrate important principles generally applicable to understanding magmatic-hydrothermal and metamorphic deposits that may have contained significant volumes of more complex polymetallic melts.

On Bivariate Smoothness Spaces Associated with Nonlinear Approximation

In recent years there have been various attempts at the representations of {\mbox multivariate} signals such as images, which outperform wavelets. As is well known, wavelets are not optimal in that they do not take full advantage of the geometrical regularities and singularities of the images. Thus these approaches have been based on tracing curves of singularities and applying bandlets, curvelets, ridgelets, etc., or allocating some weights to curves of singularities like the Mumford–Shah functional and its modifications. In the latter approach a function is approximated on subdomains where it is smoother but there is a penalty in the form of the total length (or other measurement) of the partitioning curves. We introduce a combined measure of smoothness of the function in several dimensions by augmenting its smoothness on subdomains by the smoothness of the partitioning curves. Also, it is known that classical smoothness spaces fail to characterize approximation spaces corresponding to multivariate piecewise polynomial nonlinear approximation. We show how the proposed notion of smoothness can almost characterize these spaces. The question whether the characterization proposed in this work can be further “simplified” remains open.

Which four-part partition games are isomorphic to Silverman's game?

A four-part partition game on a rectangle is a two-person zero-sum game where the pure strategy sets are intervals and the resulting rectangle is partitioned by three curves into four regions, on each of which the payoff is constant. Such a game is essentially a generalization of Silverman's game, which has been studied extensively by the author and others. It has been shown previously that if two of the partitioning curves of suitable type are given, and the four payoffs are suitably related, there is a unique choice of the third curve for which the game is isomorphic to Silverman's game. In the present note this third curve is expressed explicitly in terms of the first two, provided that one of the two given curves is the middle one of the three.

Transport and Sorption of Organic Gases in Activated Carbon

The relationships among adsorption-desorption kinetics, equilibrium partitioning, and fixed-column breakthrough curves are elucidated for airborne benzene and vinyl chloride on activated carbon grains and fibers. An electrobalance is used to measure adsorption/desorption kinetics and to obtain equilibrium partitioning data; column experiments are conducted to determine additional equilibrium partitioning data and to measure breakthrough curves. A porous sphere/cylinder intragrain diffusion model, coupled with a Freundlich isotherm to describe equilibrium partitioning, conforms closely to the experimental kinetic data for both adsorption and desorption. In addition, it is shown that the adsorption isotherm may be accurately predicted based on the asymmetry between adsorption and desorption rates measured in a single kinetic experiment. The parameters extracted from the kinetic experiment, when combined with the appropriate transport equations, can be used to accurately forecast column breakthrough curves.

Characterizing the hierarchical Hough transform through a polygonal approximation algorithm

We propose to study the relationship between the hierachical Hough transform and classical algorithms for partitioning curves into segments. We show that the set of segments found by classical algorithms is a subset of the segments found by the hierarchical Hough transform. This new relationship allows to have a better understanding of the behaviour of some parameters of the hierarchical Hough transform.

Interwell Tracer Test To Determine Residual Oil Saturation In A Gas-Saturated Reservoir. Part II: Field Applications

Abstract This paper entails the implementation and interpretation of the first successful interwell test ever reported in the industry to determine residual oil saturation in a gas-saturated reservoir. Two interwell tests were conducted in Golden Spike to measure the residual oil saturation to gas-flood at two different depths. This method, which involves the comparison of the whole partitioning and non-partitioning tracer curves to derive residual oil saturation values, is an improvement of the original method that compared only the breakthrough times. A chromatographic transformation technique was developed for curve comparison so as to avoid tedious simulation for data interpretation. For layers with different residual oil saturation, the transformation method works only for a pseudo single porosity reservoir with ordered layers, i.e. low residual oil saturation for a high permeability layer. The first test indicated that there were three layers with residual oil saturations of 7%, 15% and 20%. The results from the second test conducted in a lower production interval were masked by the presence of extensive fractures in the production zone. In spite of the interference from the fracture production, the residual oil saturation in some flow channels could still be estimated to be about 12%. Because it is unlikely that the tracers could enter the matrix during the test, the residual oil saturation measured is probably the oil saturation in some secondary channels. Sulphur hexafluoride, F13BI (brome-trifluoro-methane) and F12 (dichloro-difluoro-methane) were selected as the tracers from the previous lab tests. The tracers were pre-mixed and injected as a liquid. A Freon phase behavior program was developed to calculate the exact amount of the Freon's injected. Introduction Upon evaluation of various conventional methods, the interwell tracer test(1) has been identified as the most reliable means to determine residual oil saturation in Golden Spike, a low-pressure, low-porosity, gas-saturated carbonate reservoir. The original interwell method disclosed by Cooke(2) in 1971 involved the comparison of the relative breakthrough times of the partitioning and non-partitioning tracers for residual oil saturation calculation. Breakthrough time is not a well-defined quantity, as it is often obscured by dispersion, the detection limit, and most importantly, by the streamline and layer distributions. As a result, the interpretation technique, certainly inadequate, draws criticism(3,4). Consequently, because of the lack of suitable chemicals and interpretation technique, no single test has been tried in the field or, at least, published in the literature. To circumvent the problems anticipated in Cooke's method, our interwell method employed a whole curve comparison to derive a residual oil saturation value at any location on the curve using a simple "landmark" comparison technique. Under ideal conditions, residual oil saturation can be determined by layers. To demonstrate the feasibility of the method, extensive tests were performed in the lab(5). Slim tube displacement results indicated that residual oil saturation could be measured in an accuracy of± 1 % pore volume from the separation of tracers. This paper entails the design, implementation and interpretation of the two field tests conducted in Golden Spike in 1987.

Investigation of a Damsite Utilizing Drill-hole, Down-hole Geophysical and Surface Geophysical Data

Research Article| January 01, 1978 Investigation of a Damsite Utilizing Drill-hole, Down-hole Geophysical and Surface Geophysical Data ROBERT B. JOHNSON; ROBERT B. JOHNSON Robert B. Johnson is with the Dept. of Earth Resources, Colorado State University, Fort Collins, Colorado. Search for other works by this author on: GSW Google Scholar LYNN A. JOHNSON LYNN A. JOHNSON Lynn A. Johnson is with the U.S. Bureau of Reclamation, Denver, Colorado. Search for other works by this author on: GSW Google Scholar Environmental & Engineering Geoscience (1978) xv (3): 285–294. https://doi.org/10.2113/gseegeosci.xv.3.285 Article history first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation ROBERT B. JOHNSON, LYNN A. JOHNSON; Investigation of a Damsite Utilizing Drill-hole, Down-hole Geophysical and Surface Geophysical Data. Environmental & Engineering Geoscience 1978;; xv (3): 285–294. doi: https://doi.org/10.2113/gseegeosci.xv.3.285 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyEnvironmental & Engineering Geoscience Search Advanced Search Abstract The proposed site of an earth dam for the Bureau of Reclamation's Nebraska Mid-State Project presents a complex foundation problem involving alluvial fill in a buried channel cut in similar sediments of Tertiary age. Three drill holes provided control of stratigraphy, material types and unit thicknesses. Electric and gamma-ray logs were run to obtain geophysical data for the materials encountered. Surface geophysics was employed to determine the lateral extent, changes in materials and thickness, and channel configuration of the units noted in the drill-hole and geophysical log data.The physical properties of the materials restricted the use of surface geophysics. Electrical earth resistivity provided the only means of separating and mapping the units on the basis of electrical contrasts provided by the electric logs. Gamma-ray log data served to reinforce electric log and drill-hole correlations.Empirical interpretation of total resistivity and Lee partitioning curves were employed for correlation of resistivity and drill-hole data and for interpretation of lateral changes and extrapolation of subsurface conditions between drill holes. Curve fitting techniques provided a means of obtaining a geophysical overview of the survey uncomplicated by minor unit differences.The integrated use of drill-hole, geophysical well log and surface geophysical data permitted development of a materials profile along the section of dam involved. Further drilling may now be done at those sites shown to present critical interfacing of potentially troublesome materials. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.

Partitioning of Fe (super ++) and Mg (super ++) between coexisting synthetic olivine and orthopyroxene

Partitioning curves, experimental procedures and results, comparison with compositions, index of equilibria, absence of temperature dependence, application of data to pairs from chrondritic meteorites, stratiform basic intrusions, peridotite nodules, and alpine peridotites