中国地质大学：《构造地质学》课程PPT教学课件（英文版）Chapter 5 construction of cross-section

REVIEW

REVIEW

RULES OF‘VS Traces of dipping layers that intersect uneven ground or topography Left hand side: Map view of layer in stream valle Right hand side: Cross section view of dipping layer. (after Marshak and Mitra laboratory manual

RULES OF ‘VS’ Traces of dipping layers that intersect uneven ground or ‘topography’. Left hand side: Map view of layer in stream valley. Right hand side: Cross section view of dipping layer. (after Marshak and Mitra laboratory manual.) 11

LECTURE 5 CONSTRUCTION OF VERTICAL SECTION

LECTURE 5 CONSTRUCTION OF VERTICAL SECTION

CONSTRUCTION OF VERTICAL SECTION 1 Select the location of the section and draw a section line(usually perpendicular to the strike of the main structures), right-hand end is its more easterly end 2 Draw a topographic profile along the line of section. Determine the base line on the squared paper and draw a vertical scale line at each end. The base line usually locates at 1-1.5 cm lower than the lowest point along the line. 3 Add the structural data to the topographic profile. Data on either side of the section line may be projected to the section. Note to use apparent dip

CONSTRUCTION OF VERTICAL SECTION 1 Select the location of the section and draw a section line (usually perpendicular to the strike of the main structures), right-hand end is its more easterly end 2 Draw a topographic profile along the line of section. Determine the base line on the squared paper and draw a vertical scale line at each end. The base line usually locates at 1-1.5 cm lower than the lowest point along the line. 3 Add the structural data to the topographic profile. Data on either side of the section line may be projected to the section. Note to use apparent dip

CONSTRUCTION OF VERTICAL SECTION 4 Extrapolate the surface data downward into the underground 5 legend 5 Fill lithologic symbols to indicate different rock units. Label the Stratigraphic symbols 6 Color the section and the legend(use the chromatogram of strata) 7 Title. horizontal scale, orientation of the section

CONSTRUCTION OF VERTICAL SECTION 4 Extrapolate the surface data downward into the underground. 5 legend 5 Fill lithologic symbols to indicate different rock units.Label the Stratigraphic symbols. 6 Color the section and the legend (use the chromatogram of strata) 7 Title, horizontal scale, orientation of the section

Chromatogram of strata Quarternary Devonian Neogene Silurian Paleogene Ordovician Cretaceous Cambrian Jurassic Sinian Triassic Mesoproterozoic Permian Paleoproterozoic Carboniferou Archaean

Chromatogram of Strata Quarternary Neogene Paleogene Cretaceous Jurassic Triassic Permian Carboniferou Devonian Silurian Ordovician Cambrian Sinian Mesoproterozoic Paleoproterozoic Archaean

Line of section and topographic profile from a map Topographic profile along the line of section

1:2000 LEGEND T2 limestone T T shale T? marl 27 B T g limestone sandstone W !I A-B SECTION E Red Water B 50 401 …T2…+40 20 20 10m 10m

marl shale sandstone limestone thin limestone Red A-B SECTION Red Water River LEGEND

k.conglomerate T。 mudstone K T:: /P2 10° 0y" 74 T? marl Jianfeng T: limestone P shale P P[叫 sandstone 100m Jianfen B E 200 200 150 150 K 100 100 50 T 50 P om

Jianfeng Jianfeng conglomerate mudstone marl limestone shale sandstone

Geological Map of Muy unling Area Q Middle Jurassic Upper Permian er Perlan Middle Carboniferous Lower Carboniferous ine-grained sandston Lower Silurian slate C Upper Ordovician