Titlebook: Stable Mineral Assemblages of Igneous Rocks; A Method of Calculat Alfred Rittmann Book 1973 Springer-Verlag Berlin · Heidelberg 1973 Gestei

chisel

Examples,In the following, some selected examples are calculated in detail and commented on in order to illustrate not only the procedure of calculating but also the critical interpretation of the results and the calculation of heteromorphic mineral assemblages in different facies.

Interlocking

Trabeculoplasty

Comparison between the Stable Mineral Assemblage and the Mode,of the various facies and correspond to a temperature at which the crystallization was terminated. The calculation does not take into consideration possible subsolidus phase transformations and reactions, such as the formation of perthite or antiperthite in alkaline feldspars, or the unmixing of potash nepheline into nepheline and kalsilite.

heckle

Comparison of the C.I.P.W. Norm with the Rittmann Norm,g to a fixed scheme. Most of these idealized minerals do not correspond to the natural rock-forming minerals, the composition of which is much more complicated. In order to illustrate this fact, the chemical compositions of some femic silicates are presented in Tables 1 and 2 in the form of their C.I.P.W. norms.

扩大

Application of the Rittmann Norm Method to Petrological Problems,osition. More often, however, large discrepancies arise between the norm and the mode. Especially with regard to the undersaturated volcanics the results of norm calculations according to the C.I.P.W. system often show great anomalies. This fact was recently acknowledged by . and . (1971).

Forsake

Minerals, Rocks and Mountainshttp://image.papertrans.cn/s/image/875464.jpg

拥挤前

https://doi.org/10.1007/978-3-642-65482-4Gestein; Vulkangestein; classification; evolution; igneous rock; mineral; petrography; volcanic rock

草率女

Book 1973ilicic rocks, the deviation of the norm from the mode is generally within tolerable limits. For the melanocratic and highly subsilicic rocks, on the other hand, the CI.P. W. scheme of calculation too often yields results which fail to reflect the observed mineral composition. The anomalies produced

思想流动

Entreaty

Alfred Rittmannbles. The optimization is performed iteratively: first an initial guess of . is taken, then the distance function . is evaluated by integrating the ocean model for a time interval in which tracer (or other) measurements are available. The gradient of . with respect to . is calculated with the aid of