Csámer, Árpád

Rózsa, Péter

Tóth, S.

English

Tóth S.

Csámer Árpád

Rózsa Péter

University of Szeged

Acta Mirieralogica-Petrographica, Abstract Series 1, Szeged, 2003 A DOS PROGRAM FOR SUPPORTING MODAL ANALYSIS OF ROCKS (MOD_EL v. 2.12) TÓTH, S . \ CSÁMER. Á.2 & RÓZSA, P.2 1 Darabos u. 10, H-4026 Debrecen, Hungary. 2 Department of Mineralogy and Geology, University of Debrecen, P.O. Box 4, H-4010 Debrecen, Hungary. E-mail: csamera@delfin.klte.hu Modal analysis is a basic pétrographie method for deter-mination of mineralogical composition and grain-size distri-bution of rocks. Two types of data series can be obtained by this method: (1) relative quantity of rock forming minerals, and (2) grain-size distribution of the studied rock. Moreover, using an appropriate method, grain-size distribution of the main mineral components can be also determined. This way, further petrological conclusions (such as classification of the texture, distinction of rock varieties and facies, etc.) can be drawn. Any method of the modal analysis should satisfy three principal requirements: (1) appropriate accuracy, (2) simplicity, and (3) speed. Amongst methods of modal analysis (CHAYES, 1956) the authors regard the classic Rosiwal 's method (ROSIWAL, 1898) - measuring along the line - as the most efficient. First, this method does not require special equipment, and second, relative quantity of the rock forming minerals as well as grain-size distribution can be simultaneously determined. Moreover, in the case of necessary measurements its accu-racy is acceptable (JÂRAI et al., 1997). However, a rela-tively long line has to be measured, and large amount of data has to be evaluated to obtain precise results. MOD_EL v. 2.12 software package introduced by this paper is able to use data recorded in simple text and special XLS (MS-Excel) file formats, and to evaluate these data statistically. It gives the minimal measuring length for the required accuracy, and compiles tables and graphs for repre-senting the results of the measurement. Minimal hardware and software requirements are to run the software: AT 386 compatible computer with (4 MB RAM, 20 MB hard disk space, monochromatic monitor, MS-DOS 5.5 operation sys-tem. Of course, MOD_EL v. 2.12 runs on Windows OS (Windows 9x/NT/2000), too. Both English and Hungarian versions are available. As a final result, the program lists the grain-size and mineral components data in a summarized table, and makes grain-size distribution curves (Fig. 1). Acknowledgement This work was supported by the OTKA Grant T-029058. References CHAYES, F. (1956): Petrographic Modal Analysis. John Wiley and Sons Inc., New York. 113 pp. JÁRAI, A., KOZÁK, M. & RÓZSA, P. (1997). Math. Geol.. 29/8: 977-991. ROSIWAL, A. (1898). Verh. der k. k. Geol. Reichanstalt, Wien, 5 -6 : 143-175. • i o " 1 ">»LO1dd F o l v M b ! U r n l i l l i k l l l n l M t I n m i i s & i a l Fig. 1: Grain-size distribution curves drawn by MOD_EL v. 2.12 program. 103 

A DOS program for supporting modal analysis of rocks (Model v. 212 )

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A Dos program for supporting modal analysis of rocks (Model v. 212 )

A Dos program for supporting modal analysis of rocks (Model v. 212 )

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