Presentation is loading. Please wait.

Presentation is loading. Please wait.

GEOLOGIC MAPPING 2014 EVENT OVERVIEW. MARK A. VANHECKE NATIONAL SCIENCE OLYMPIAD EARTH-SPACE SCIENCE EVENT CHAIR PRESENTED BY:

Similar presentations


Presentation on theme: "GEOLOGIC MAPPING 2014 EVENT OVERVIEW. MARK A. VANHECKE NATIONAL SCIENCE OLYMPIAD EARTH-SPACE SCIENCE EVENT CHAIR PRESENTED BY:"— Presentation transcript:

1 GEOLOGIC MAPPING 2014 EVENT OVERVIEW

2 MARK A. VANHECKE NATIONAL SCIENCE OLYMPIAD EARTH-SPACE SCIENCE EVENT CHAIR PRESENTED BY: mvanhecke@comcast.net

3 PRESENTATION OBJECTIVES: Identify event parameters for the 2014 Geologic Mapping Event Identify the basic features of geologic maps Use a geologic map diagram to construct a cross section and project map features Interpret a block diagram and order rock strata from oldest to youngest

4 EVENT OVERVIEW 2014 GEOLOGIC MAPPING

5 2014 EVENT OVERVIEW Identify basic features of geologic maps Interpret geologic map features including intrusions, subsurface geometries, deformation features and subsurface depositional features Identify folds, fault types and erosional patterns Construct fault sections, topographic profiles, projections of mapped features

6 2014 EVENT OVERVIEW Identify structural elements shown in geologic maps including synforms, antiforms, basins, monoclines, domes and saddles Determine bed thicknesses, true dip and orientations of planes from point

7 WHAT IS A GEOLOGIC MAP? 2014 GEOLOGIC MAPPING

8 WHAT ARE GEOLOGIC MAPS? A geologic map shows: Mappable Rock Layers Mappable sediment layers that cover up the rocks Geologic structures including folds, faults and intrusions Mappable rock layers are recognized consistently across a landscape

9 WHAT ARE GEOLOGIC MAPS? Mappable units of rock and sediment may be identified using letter symbols

10 WHAT ARE GEOLOGIC MAPS? Mappable units of rock and sediment may also use colors, patterns or combinations of letter symbols and colors/patterns

11 GEOLOGY AND GEOLOGIC HISTORY

12 PRACTICAL APPLICATIONS

13 NATURAL RESOURCES

14 GEOHAZARDS

15 GROUNDWATER

16 BASIC FEATURES OF GEOLOGIC MAPS 2014 GEOLOGIC MAPPING

17 GEOLOGIC MAPS

18 BASIC FEATURES OF GEOLOGIC MAPS The basic features of a geologic map are the map itself and the legend or key used to explain the symbols, colors/patterns

19 STRATIGRAPHIC COLUMNS

20 CROSS SECTIONS

21 BLOCK DIAGRAMS

22 DRAWING A CROSS SECTION 2014 GEOLOGIC MAPPING

23 DRAWING A GEOLOGIC CROSS SECTION A geologic map identifies different rock types and where they can be seen on the surface

24 DRAWING A GEOLOGIC CROSS SECTION A cross section of a geologic map is a vertical slice of the Earths surface that shows what the underlying geologic structure at that location looks like

25 DRAWING A GEOLOGIC CROSS SECTION A cross section of a geologic map also shows the boundaries between different types of rock found on the surface

26 DRAWING A GEOLOGIC CROSS SECTION A cross section of a geologic map also shows the orientation of rock layers where they intersect the surface. The orientation or direction of rock layers is expressed as Strike and Dip.

27 DRAWING A GEOLOGIC CROSS SECTION Strike refers to the compass bearing (direction) of a line formed by the intersection of a horizontal plane and an inclined layer of rock. N NE SW Angle of the strike is from NE to SW In a strike-dip symbol, the larger line refers to the Strike

28 DRAWING A GEOLOGIC CROSS SECTION Dip refers to the angle between a horizontal plane and the inclined stratum of rock, fault or fracture 45º Horizontal Plane Strike Line Dip Direction

29 DRAWING A GEOLOGIC CROSS SECTION In a strike-dip symbol, the smaller line indicates Dip 45

30 DRAWING A GEOLOGIC CROSS SECTION The location of the dip line in relation to the strike line indicates the direction of the dip. 45 Rock layer dips to the east 24 Rock layer dips to the west

31 DRAWING A GEOLOGIC CROSS SECTION Solve the strike and dip problems given on Worksheet 1 Section 1

32 WORKSHEET 1: SECTION 1 ANSWERS 40 35 50 40 35 50 Strike Dip East West East SE NW SE

33 DRAWING A GEOLOGIC CROSS SECTION Strike and Dip is usually expressed in bearings (Quadrants)

34 DRAWING A GEOLOGIC CROSS SECTION Writing strike and dip coordinates 24 Strike= N45ºW Dip= 24ºSW 43 Strike= N90ºE Dip= 43ºN

35 DRAWING A GEOLOGIC CROSS SECTION On Worksheet 1 Section 2 measure the angle of strike and write out the bearings for the strike and dip measurements given

36 WORKSHEET 1: SECTION 2 ANSWERS 52 38 Strike = N44ºW (or S44ºE) Dip= 52ºSW Strike= N82ºE (or S82ºW) Dip= 38ºNW

37 DRAWING A GEOLOGIC CROSS SECTION STEP 1On Worksheet 2, draw a horizontal line just below the diagram as shown below

38 DRAWING A GEOLOGIC CROSS SECTION STEP 2Transfer all available information from the diagram as shown to the line you just drew.

39 DRAWING A GEOLOGIC CROSS SECTION STEP 3Indicate the locations of boundaries between layers on the horizontal line as shown

40 DRAWING A GEOLOGIC CROSS SECTION STEP 4Use a protractor to measure the direction and angle of the dip and draw a small line on the horizontal line for each as shown

41 DRAWING A GEOLOGIC CROSS SECTION How are different outcrops of the same layer connected? How do dip angles and directions change above and below the surface?

42 DRAWING A GEOLOGIC CROSS SECTION STEP 5Connect the boundary lines for each layer as shown

43 PRINCIPLES OF STRATIGRAPHY 2014 GEOLOGIC MAPPING

44

45 INTERPRETING A BLOCK DIAGRAM 2014 GEOLOGIC MAPPING

46 INTERPRETING A BLOCK DIAGRAM Block diagrams show different rock strata and changes that have been made over time to their layering

47 INTERPRETING A BLOCK DIAGRAM Fault Original Horizontality Superposition Igneous Intrusion Nonconformity

48 INTERPRETING A BLOCK DIAGRAM

49 OLDESTYOUNGEST

50 INTERPRETING A BLOCK DIAGRAM Original Horizontality Superposition Angular Disconformity Disconformity Igneous IntrusionsFaults Nonconformity

51 INTERPRETING A BLOCK DIAGRAM

52 OLDESTYOUNGEST

53 RESOURCES 2014 GEOLOGIC MAPPING

54 RESOURCES http://geomaps.wr.usgs.gov/parks/gmap/gmap3.html USGS Geologic Maps. An excellent discussion of strike and dip. It also provides a good introduction to map keys. http://www.wwnorton.com/college/geo/geolab/animations. aspx This web-based Norton Publishing Lab Manual for Introductory Geology is filled with animations that show the movements of geologic features that are identified on many maps http://www.youtube.com/watch?v=ZZHgxlh0PQ4 Excellent Video Series I used for the Block Diagram Activities (three parts to series) http://www.youtube.com/watch?v=Vgo8Z63n60g Excellent description of drawing a Cross Section I used for this activity


Download ppt "GEOLOGIC MAPPING 2014 EVENT OVERVIEW. MARK A. VANHECKE NATIONAL SCIENCE OLYMPIAD EARTH-SPACE SCIENCE EVENT CHAIR PRESENTED BY:"

Similar presentations


Ads by Google