variation diagram

variation diagram

[‚ver·ē′ā·shən ‚dī·ə‚gram]
(petrology)
A diagram constructed by plotting the chemical compositions of rocks in an igneous rock series in order to show the genetic relationships and the nature of the processes that have affected the series. Also known as Harker diagram.
References in periodicals archive ?
The traction tests at room temperature and under cryogenic conditions were performed on a universal testing machine INSTRON 1196 that is equipped with an automatic system for recording the load variation diagram, as an electrical sensing device measures the load.
The spider variation diagrams for granites, granodiorites, diorites and gabbroic diorites show slope ofthe data from LILE towards HFSE and depletion ofNb which are the characteristic features of their calc-alkaline nature related to island arc setup.
For the two models mentioned in step 1 with different densities of elements, the variation diagrams are given in the fig.
With the values obtained for all the points of contact are represented the variation diagrams during the meshing cycle.
Generalizations on processes can be made from variation diagrams showing representatives of the three magma series (Fig.
1, 2) are represented the variation diagrams of mechanical parameters, diagrams obtained in the mechanical testing conditions mentioned above for case of test no.
Using all these results the variation diagrams of the measured or calculated cutting efforts versus the cutting speed and feed were drown.