WorldCat Identities

Rhodes, J. M. (John Michael) 1938-

Overview
Works: 13 works in 24 publications in 1 language and 539 library holdings
Genres: Academic theses 
Roles: Author, Editor, Creator
Classifications: QE523.M38, 559.691
Publication Timeline
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Most widely held works by J. M Rhodes
Mauna Loa revealed : structure, composition, history, and hazards( Book )

7 editions published in 1995 in English and held by 492 WorldCat member libraries worldwide

The geological relationships of the Rum Jungle Complex, Northern Territory by J. M Rhodes( Book )

4 editions published in 1965 in English and held by 28 WorldCat member libraries worldwide

Mauna Loa revealed : structure, composition, history, and hazards( Book )

1 edition published in 1995 in English and held by 7 WorldCat member libraries worldwide

The geological relationships of the Rum Jungle Complex, northern territory by J. M Rhodes( Book )

1 edition published in 1965 in English and held by 2 WorldCat member libraries worldwide

The geochemistry of a granite-gabbro association at Hartley, New South Wales by J. M Rhodes( )

3 editions published in 1969 in English and held by 2 WorldCat member libraries worldwide

Wallhallow, N. T. : sheet SE/53-7 by K. A Plumb( Book )

1 edition published in 1964 in English and held by 1 WorldCat member library worldwide

The structure and chemistry of feldspars in selected Australian granites by J. M Rhodes( )

1 edition published in 1966 in English and held by 1 WorldCat member library worldwide

Australia 1:250,000 by Australia( )

1 edition published in 1963 in English and held by 1 WorldCat member library worldwide

Australia 1:250,000 by Australia( )

1 edition published in 1965 in English and held by 1 WorldCat member library worldwide

Matrix Effects in Quantitative Analysis of Laser-Induced Breakdown Spectroscopy (LIBS) of Rock Powders Doped with Cr, Mn, Ni, Zn, and Co( )

in English and held by 1 WorldCat member library worldwide

Obtaining quantitative chemical information using laser-induced breakdown spectroscopy is challenging due to the variability in the bulk composition of geological materials. Chemical matrix effects caused by this variability produce changes in the peak area that are not proportional to the changes in minor element concentration. Therefore the use of univariate calibrations to predict trace element concentrations in geological samples is plagued by a high degree of uncertainty. This work evaluated the accuracy of univariate minor element predictions as a function of the composition of the major element matrices of the samples and examined the factors that limit the prediction accuracy of univariate calibrations. Five different sample matrices were doped with 10-85 000 ppm Cr, Mn, Ni, Zn, and Co and then independently measured in 175 mixtures by X-ray fluorescence, inductively coupled plasma atomic emission spectrometry, and laser-induced breakdown spectroscopy, the latter at three different laser energies (1.9, 2.8, and 3.7 mJ). Univariate prediction models for minor element concentrations were created using varying combinations of dopants, matrices, normalization/no normalization, and energy density; the model accuracies were evaluated using root mean square prediction errors and leave-one-out cross-validation. The results showed the superiority of using normalization for predictions of minor elements when the predicted sample and those in the training set had matrices with similar SiO2 contents. Normalization also mitigates differences in spectra arising from laser/sample coupling effects and the use of different energy densities. Prediction of minor elements in matrices that are dissimilar to those in the training set can increase the uncertainty of prediction by an order of magnitude. Overall, the quality of a univariate calibration is primarily determined by the availability of a persistent, measurable peak with a favorable transition probability that has little to no interference from neighboring peaks in the spectra of both the unknown and those used to train it
Mauna Loa revealed : structure, composition, history, and hazards( )

1 edition published in 2010 in English and held by 1 WorldCat member library worldwide

The oxidation state of Hawaiian magmas by Michael Vollinger( )

1 edition published in 2017 in English and held by 1 WorldCat member library worldwide

In order to estimate the oxygen fugacity of Hawaiian lavas I have measured the ferric/ferrous ratios of samples from the 1984 eruption of Mauna Loa volcano and from the ongoing (1983-2017) Puu Oo eruption of Kilauea volcano. Fifteen samples were studied from the 21 day Mauna Loa eruption and 86 samples, erupted between 1983 and 2004, of the 34 year long Kilauea eruption. Both studies show that, in order to obtain reliable estimates of oxygen fugacity when, where, and how basaltic lava is sampled is of critical importance. Water-quenched lavas and spatter sampled at, or near vents, are less oxidized than water-quenched samples taken from open flow channels several kilometers away from the vent, or from slowly-cooled solidified flows. Additionally, samples of water-quenched lava traveling in lava tubes are less prone to oxidation than lava flowing in open channels, with oxygen fugacities similar to those of near vent quenched samples. The oxidation state of the rapidly quenched near vent or lava tube samples is at or below magnetite-wüstite (MW). This contrasts with the oxidation state of previously reported values for Hawaiian lavas, which are closer to fayalite-magnetite-quartz (FMQ) or nickel-nickel oxide (NNO). From this I conclude that the initial oxygen fugacity of Hawaiian parental magmas is close to MW and not FMQ, and that previous estimates of the oxidation state of Hawaiian magmas, based on data from solidified lava flows, were too high. This implies that the plume source of both Mauna Loa and Kilauea magmas is also close to MW, but not as reduced as the mantle source of mid-ocean ridge basalts
Australia 1:250,000 by Australia( )

1 edition published in 1963 in English and held by 1 WorldCat member library worldwide

 
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Audience level: 0.58 (from 0.56 for Mauna Loa ... to 0.95 for Mauna Loa ...)

Alternative Names
Rhodes, J. M.

Rhodes, John M.

Rhodes, John Michael 1938-

Languages
English (24)