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Evaluation for Rock Cleavage Using Distribution of Microcrack Spacings (I)
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 Title & Authors
Evaluation for Rock Cleavage Using Distribution of Microcrack Spacings (I)
Park, Deok-Won;
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 Abstract
The characteristics of the rock cleavage inherent in Jurassic granite from Geochang were analysed. The phases of distribution of microcrack spacings were derived from the enlarged photomicrographs() of the thin section. The evaluation for the six directions of rock cleavages was performed using nine parameters such as (1) frequency of microcrack spacing(N), (2) frequency ratio( and 4 mm >) to total spacing frequency(N:191), (3) spacing ratio() to total spacing(118.49 mm), (4) mean spacing(), (5) difference value() between mean spacing and median spacing(), (6) density of spacing, (7) median spacing, (8) reduction ratio of spacing frequency to length frequency and (9) magnitude of exponent( and b) related to the distribution type of diagram. Especially the close dependence between the above spacing parameters and the parameters from the spacing-cumulative frequency diagrams was derived. The results of correlation analysis between the values of parameters for three rock cleavages and those for three planes are as follows. The values of (I) parameters(1, 2 and 3), (II) parameters(4, 5 and 6), (III) parameter(7), (IV) parameter(8) and (V) parameter(9) show the various orders of H(hardway, H1+H2) < G(grain, G1+G2) < R(rift, R1+R2), R < G < H, R < H < G, G < H < R and H < G < R, respectively. On the contrary, the values of the above four groups(I~IV) of parameters for three planes show reverse orders. This type of correlation analysis is useful for discriminating three quarrying planes. Six spacing-cumulative frequency diagrams were arranged in increasing order on the value of main parameter(). These diagrams show an order of R2 < R1 < G2 < G1 < H2 < H1 from the related chart. In other words, the above six diagrams can be summarized in order of rift(R1+R2) < grain(G1+G2) < hardway(H1+H2). These results indicate a relative magnitude of rock cleavage related to microcrack spacing. Especially, the above main parameter could provide advanced information for prediction the order of arrangement among the diagrams.
 Keywords
Jurassic granite;rock cleavage;microcrack spacing;nine parameters;correlation analysis;reverse orders;spacing-cumulative frequency diagrams;order of arrangement;
 Language
Korean
 Cited by
1.
Evaluation for Rock Cleavage Using Distribution of Microcrack Spacings (II), The Journal of the Petrological Society of Korea, 2016, 25, 2, 151  crossref(new windwow)
2.
Evaluation for Rock Cleavage Using Distribution of Microcrack Spacings (III), The Journal of the Petrological Society of Korea, 2016, 25, 4, 311  crossref(new windwow)
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