ISO-710-6-1984.pdf
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1、International Standard ,NTEANAT,ONAL O,?GAN,ZAT,ON FOR STANDARDIZATIONWdEHYHAPOHAR OPrAHM3AL,MR fl0 CTAH,lAPTWAlJ4MRGANlSATlON INTERNATIONALE DE NORMALISATION Graphical symbols for use on detailed maps, plans and geological cross-sections - Part 6 : Representation of contact rocks and rocks which ha
2、ve undergone metasomatic, pneumatolytic or hydrothermal transformation or transformation by weathering Symboles graphiques B Miser sur les cartes, les plans et /es coupes g.Gologiques d b) metasomatic; c) pneumatolytic and hydrothermal transformation; 2 General The rocks dealt with in this part of I
3、S0 710 are formed either by isochemical processes (in which case they are pure contact rocks) or allochemical processes, i.e. transformation processes with allochthone material which generally also take place within the aureole of a magmatic intrusion. In general, these rocks owe their existence to
4、pneumatolytic or hydrothermal processes with allochthone material but there are also some rocks formed by molecular diffusion at elevated temperatures and by autohydration. These processes may result in a greater or lesser degree of transformation which is reflected in the rock. Occasionally, the tr
5、ansformation processes have produced rocks which are identical to those of the metamorphic facies; the hydrothermal sericitisation of a volcanic rock, for example, may lead to the formation of a sericitic schist. In such a case, it is considered advisable to use the symbol for the metamorphic rock,
6、particularly when no residue of the original volcanic rock remains. 3 Principles of representation (see the table) 3.1 General Basically, the symbols serve to represent the rocks formed by the various transformation processes. They are not intended for characterization or interpretation of genetic p
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- ISO 710 1984
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