710/4 (ISo International Standard Graphical symbols for use on detailed maps, plans and geological cross-sections Part 4 : Representation of metamorphic rocks Symbolesgraphiquesautilisersurles cartes,les plans et les coupes geologiques detalles-Partie4:Representationdes roches metamorphiques Firstedition-1982-04-15 SO710/4-1982(E) UDC528.94:552.4:003.62 Ref.No.1SO710/4-1982(E) Descriptors : geology.maps, drawings, schematic presentation, transverse sections, symbols, graphic symbols, metamorphic rocks. Foreword Iso (the International Organization for Standardization)is a worldwide federation of national standards institutes (Iso member bodies).The work of developing Inter- national Standards is carried out through Iso technical committees. Every member body interested in a subject for which a technical committee has been set up has the right tobe represented on that committee.International organizations,governmental and non-governmental, in liaison with Iso, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the Iso Council. international Standard ISO710/4was developedbyTechnical CommitteeISO/TC 82, Mining,and was circulated to the member bodies in June1981. It has been approved by the member bodies of the following countries : Brazil Germany, F.R. Romania Czechoslovakia Sweden Egypt, Arab Rep. of Netherlands United Kingdom France Poland USSR No member body expressed disapproval of the document. InternationalOrganizationforStandardization,1982 ? . Printed in Switzerland ISO710/4-1982(E) INTERNATIONALSTANDARD Graphical symbols for use on detailed maps, plans and geological cross-sections Part 4 : Representation of metamorphic rocks Introduction Main types 0 Other documents in this series on graphical symbols for use on 2.1 Principlesofrepresentation (seetable1) detailed maps, plans, and geological cross-sections include : Part 1 : General rules of representation. 2.1.1 Table 1 comprises the most important rocks of the three facies or zones of metamorphism, It is divided into three col- Part 2 : Representation of sedimentary rocks. umns containing the symbols for the rocks of the facies of green schists, of amphibolites, and of granulites. Part 3 : Representation of magmatic rocks. These three facies are roughly equivalent to the older groups of Part 5 : Representation of minerals. epizone,mesozone, and catazone rocks. Part 6: Representation of.contact rocks and rocks which As the limits between the two groups characterized by a higher have undergone metasomatic, pneumatolytic or hydrother- degree of metamorphism do not coincide, the subdivision be- mal transformation or transformation by weathering.1) ing based on facies or zones, a dotted line is used to divide them. Part 7: Tectonic symbols.1) 2.1.2 Thebasicsymbol formetamorphic rocks is ashortwavy line. This basic symbol may be used to indicate metamorphic rocks in general, i.e. when no further information is needed or Scope and field of application when the scale of the map makes a fine distinction impossible. This part of Iso 710 provides a series of symbols and orna- In conjunction with additional symbols, the wavy line is used to ments for the representation of metamorphic rocks on detailed represent metamorphic rocks of the main types. Hence, it is crossed by one or two strokes to indicate the groups which have been subjected to higher grade metamorphism. sections. The symbols are divided into two groups : The basic symbol is to be found at the top of the table. Then, at the top of each column, symbols are indicated with a view to a 1)maintypes; more detailed representation. These symbols are the basic sym- bols for the three facies or zones of metamorphic rocks. 2) varia. As in the case of magmatic rocks (see ISo 710/3), variation of They are reproduced in two tables which, being derived from a thethicknessis usedtoexpressthe