U.S. Geological Survey silicate rock standards

Flanagan, F.J.

doi:10.1016/0016-7037(67)90043-9

Cited by 219 publications

(34 citation statements)

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“…The rock is a partially serpentinized harzburgite containing 58% olivine, 9% orthopyroxene (with discontinuous clinopyroxene exsolution lamellae) and 32% serpentine, together with minor phases, such as chromite, magnetite and talc (Flanagan, 1967). PCC-1 was chosen due to its lack of plagioclase and other aluminous phases.…”

Section: Methodsmentioning

confidence: 99%

“…Although diopside is a relatively minor component of PCC-1, as suggested by CaO content (Flanagan, 1967), it is still present in sufficient abundance at the relatively low fluid/rock mass ratio used for the experiment (unity) to effectively titrate dissolved Mg in connection with serpentine/talc formation. The dissolution of diopside has implications not only for the mechanism of Mg removal from solution, but also as a potential source of REE and pH control.…”

Section: Diopsidementioning

confidence: 99%

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REE controls in ultramafic hosted MOR hydrothermal systems: An experimental study at elevated temperature and pressure

Allen

Seyfried

2005

Geochimica et Cosmochimica Acta

164

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Section: Methodsmentioning

confidence: 99%

Section: Diopsidementioning

confidence: 99%

REE controls in ultramafic hosted MOR hydrothermal systems: An experimental study at elevated temperature and pressure

Allen

Seyfried

2005

Geochimica et Cosmochimica Acta

164

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“…The used starting material for the present experiments is the AGV-2 standard andesite (Flanagan, 1967). The andesitic composition (Table 4) is similar to that of the cordilleran batholiths (Castro et al, 2013;Castro, 2014) and, for this reason, experimental results can be applied to magmas involved in crustal processes.…”

Section: Physical and Thermal Properties Of The Magma And Its Countrymentioning

confidence: 99%

Natural equivalents of thermal gradient experiments

Rodríguez

Geyer

Castro

et al. 2015

Journal of Volcanology and Geothermal Research

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Crystallization experiments using the intrinsic thermal gradient in 10 mm length capsules loaded in piston-cylinder assemblies were used to investigate silicic magma crystallization. The application of experimental results to natural environments requires the scaling of physical parameters of petrological interest. Therefore, we propose here a comparative study between thermal gradients and numerical simulations of natural magma chambers. We use the Finite Element Method to calculate thermal profiles across a cooling silicic magma chamber. These numerical profiles are compared with the intrinsic thermal structure of half-inch, piston-cylinder assemblies at 500 MPa. It is concluded that a set of varied magma chamber geometries and/or distinct stages of their cooling history can approach the intrinsic thermal structure of laboratory experiments.Once the thermal properties for magma and its host rock are fixed, the experimentalnumerical approach is mostly dependent on the volume and aspect ratio of the magma

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“…These authors applied the so called "two standard deviation method" to eliminate discordant observations and also reported their "recommended" or "consensus" values for different elements. This particular granite sample is one of the first international geochemical reference materials proposed long ago by the United States Geological Survey (e.g., see Flanagan, 1967). The compiled data were first processed by applying all thirty-three discordancy tests at 95% confidence level through DODESSYS software (Verma and Díaz-González, 2012).…”

Section: Geochemical Reference Materials Granite G-1 From Usamentioning

confidence: 99%

Alternative approach for precise and accurate Student´s t critical values and application in geosciences

Verma

Cruz-Huicochea

2013

Journal of Iberian Geology

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We applied an alternative Monte Carlo simulation approach to obtain precise and accurate critical values (with 3 to 8 decimal places) for the Student´s t test for normal samples of degrees of freedom up to 6000 and for two-sided confidence levels of 50% to 99.9% and correspondingly for one-sided confidence levels of 75% to 99.95%. As an innovation, unlike the existing literature precision estimates of critical values are also individually reported. Prior to our work, critical values (with 2 or 3 decimal places) were available in tables in the published literature. Twenty-eight regression models were evaluated to obtain the best regression fitting of the tabulated data. All conventional polynomial (from quadratic up to 8th order) regressions failed for this purpose. New equations based on double or triple natural logarithm-transformations are proposed for all not-tabulated degrees of freedom, including fractional values if required as well as for probability computations. More importantly, we suggest that these kinds of log-transformations are likely to be useful for all cases where conventional polynomial regressions fail to perform satisfactorily. To demonstrate the utility of these new critical values and best-fit equations, we provide specific examples of applications in geochemistry, chemistry and medicine. The probability estimates, obtained from the present explicit approach, are consistent with commercial and freely available software. Additionally, a more extensive application of our t values is given for processing inter-laboratory data for geochemical reference materials granites G-1 and G-2 from U.S.A. as well as for evaluating geochemical data for basic rocks from the Canary and Azores Islands.Keywords: Monte Carlo simulation, Student t test, polynomial regressions, statistical method, geochemical reference material. ResumenAplicamos un método de simulación alterno tipo Monte Carlo para obtener valores críticos precisos y exactos de t de Student (de 3 a 8 puntos decimales) para muestras normales con grados de libertad hasta 6000 y para niveles de confianza de dos colas de 50% a 99.9% y por consecuencia, para niveles de confianza de una cola de 75% a 99.95%. Como una innovación, se reporta en forma individual la precisión de los valores críticos, lo cual no sucede en la literatura publicada. Previo a nuestro trabajo, en las tablas de la li-32

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U.S. Geological Survey silicate rock standards

Cited by 219 publications

References 1 publication

REE controls in ultramafic hosted MOR hydrothermal systems: An experimental study at elevated temperature and pressure

REE controls in ultramafic hosted MOR hydrothermal systems: An experimental study at elevated temperature and pressure

Natural equivalents of thermal gradient experiments

Alternative approach for precise and accurate Student´s t critical values and application in geosciences

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