地质绘图（Geological drawing）.doc

地质绘图（Geological drawing） First, draw the stratigraphic section sketch map 1, the stratigraphic section of the map content A stratigraphic profile is a rough map of the actual situation in which the formation is exposed in the field. Used of route geology. It is to delineate the topography of the profile, further reflect the formation of a certain or some strata, layering, lithology, the location of the fossils, the thickness of the formation and contact relations and other characteristics of the formation. The topographic section of stratigraphic section map and the thickness of formation layer are estimated rather than measured. This is the main difference between the stratigraphic section and the measured section. 2, drawing steps Determine the section direction, generally require vertical line with the formation line. Select the scale so that the plotted sections are not too long or too short, while meeting the needs of representing each layer. If the length of the actual section is long and the stratigraphic classification is more complex, the section will be longer and the other side will be shorter. Generally, a diagram is kept within the length of a record book, and it is more convenient for drawing and reading. If the actual profile length is 30m, the thickness is several meters above, you can l:200 or 1:300 scale mapping. According to the selected section, direction and scale, the outline of the terrain is drawn, and the height of the terrain should be consistent with the actual situation. The boundary strata and stratification according to the true dip angle of the formation of linear numerical picture below, then the corresponding terrain profile, from the figure can be measured out the true thickness of strata and the hierarchical, pay attention to the actual thickness and check chart reflects the estimate is consistent, if not consistent, must find out in the drawing problem, corrected. Various kinds of patterns and codes are used to represent the litho