PLANE AND ATTITUDE OF STRATA

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2 Field Methods in Geology I PLANE AND ATTITUDE OF STRATA ผ ช วยศาสตราจารย ดร.ว ช ย จ ฑะโกส ทธ กานนท ภาคว ชาธรณ ว ทยา คณะว ทยาศาสตร จ ฬาลงกรณ มหาว ทยาล ย vichaic@yahoo.com

3 Outline Basic knowledge Definition Geological structures Attitude of Line and Plane Technical terms Attitude of plane Strike / Dip Dip angle / Dip direction TEST Attitude measurement Attitude notation Homework

4 BASIC KNOWLEDGE

5 DEFINITION altitude attitude

6

7 GEOLOGICAL STRUCTURES

8 Line & Plane?!?

9 Geological structures from igneous processes

10 PLUTON Subjacent mass Batholith > 100 km 2 Stock < 100 km 2 Injected mass Dike / Dyke Sill Laccolith Lopolith VOLCANO Shield volcano Cinder cone volcano Stratovolcano / Composite volcano

11 dike

12 Geological structures from sedimentary processes

13 STRATA stratum (plural=strata) Layer of rock characterized by particular lithologic properties and attributes that distinguish it from adjacent layers. International Commission on Stratigraphy (ICS) Stratum Many terms are used as follows: lamination/laminae laminae < 1 cm thick bed > 1 cm thick massive > 1 m thick thickness feature

14 TRACK

15 Geological structures from metamorphic processes

16 FOLIATION Stress & Pressure horizontal slaty cleavage vertical slaty cleavage foliation

17 FOLIATION

18 Geological structures from deformation processes

19 Force Ductile Fracture/Brittle DEFORMATION Elastic Ductile Fracture / Brittle Deformation Fold Monocline Anticline Syncline Dome Basin Fault Dip-slip fault Strike-slip fault Oblique-slip fault

20 fault

21 fold

22 ATTITUDE OF LINE AND PLANE

23 TECHNICAL TERMS Direction/Trend Inclination Trend Plunge Strike Dip Direction Dip Angle Azimuth & Quadrant/Bearing

24 DIRECTION / TREND azimuth bearing quadrant

25 azimuth bearing quadrant

26

27 Direction/Trend azimuth bearing quadrant

28 azimuth bearing quadrant

29

30 INCLINATION

31 Inclination inclination ม มเอ ยง (ดาราศาสตร ม มเงย ธรณ ว ทยาม มกด)

32 STRIKE & DIP

33 DIP ANGLE & DIP DIRECTION

34 Dip Direction Strike Dip Angle

35 Strike

36 Dip Direction

37 Dip Angle

38 ATTITUDE OF PLANE Direction/Trend Inclination Trend Plunge Strike Dip Direction Dip Angle Azimuth & Quadrant/Bearing ATTITUDE Strike/Dip DipAngle/DipDirection Trend/Plunge Strike Dip Angle Dip Direction

39 Strike / Dip Dip Direction Planar features such as fault plains, bedding surface, and joints can be oriented by measurement of the Downward inclination of the plane surface (dip) and the Direction or trend of the plane (strike). If we look at an outcrop of tilted beds in water, which gives us a level surface, it is easier to visualize dip and strike dip and strike. The angle between the bedding plane and the water surface is the dip and the trend of the waterline along the bedding plane is the strike. The true or maximum dip must be measured at right angles to the strike. These are measured in the field with a Brunton compass that was designed for this purpose.

40 Dip angle / Dip direction Dip Direction Dip Direction Strike Dip Angle

41 TEST

42

43

44

45 ATTITUDE MEASUREMENT SILVA BRUNTON

46 SILVA COMPASS True North Grid North Magnetic North

47 BRUNTON COMPASS True North Grid North Magnetic North Direction/Trend Inclination Attitude Strike/Dip Trend/Plunge

48 Strike

49 Dip Angle 37

50 Strike Dip Angle /37E or 337/37E More information

51 ATTITUDE NOTATION

52 ATTITUDE NOTATION 1. Strike notation strike and dip angle (a) N65W, 25 S ("Quadrant"): the bearing of the strike direction is 65 degrees west of north and the dip is 25 degrees in a southerly direction. For a given strike, there are only two possible dip directions, one on each side of the strike line. Hence it is necessary only to identify which side by two letters. If the strike direction is nearly N-S or E-W, then a single letter is appropriate; if the strike direction is close to the 45 degree directions (NE or NW) then two letters are preferred. (b) 295, 25 S ("Azimuth"): the azimuth of the strike direction is 295 degrees measured clockwise from north and the dip is 25 degrees toward the south. Usually the trend of the northernmost end of the strike line is given, but the azimuth of the opposite end of the line may also be used, as in 115, 25 S. 2. Dip notation dip angle and dip direction (a) 25, S25W ("Quadrant"): the dip is 25 degrees and the trend of the dip direction has a bearing of 25 degrees west of south. (b) 25/205 ("Azimuth"): the dip is 25 degrees and the trend of the dip direction has an azimuth of 205 degrees measured clockwise from north. To avoid confusion, dip angles should always be given with two digits and the trend with three, even if this requires leading zeros. 3. ChulalongkornUniversity style ( DOS = Dip-Direction Over Strike) 115/25 S ("Azimuth"): the azimuth of the strike direction is 115 degrees measured clockwise from north and the dip is 25 degrees toward the south. Usually the trend of the strike line is given in ChulalongkornUniversity style (Dip-direction over strike) by using the strike trend following the trend of the dip direction, so the azimuth of the strike in this case must be 115, not 295.

53 ATTITUDE NOTATION ON MAP MAP S CROSS SECTION

54 bearing quadrant azimuth

55 STRIKE AND DIP NOTATION 1. Strike notation strike, dip angle (a) N65W, 25 S ("Quadrant") (b) 295, 25 S ("Azimuth") 2. Dip notation dip angle, dip direction (a) 25, S25W ("Quadrant") (b) 25/205 ("Azimuth") 3. ChulalongkornUniversity Style 115/25 S ( DOS = Dip Over Strike ) N35W, 15 NE S35E, 15 NE 325, 15 NE 145, 15 NE 15, N55E CU-DOS 15/055 40/36 SE 325/15 NE

56 HOMEWORK

57 HOMEWORK STRIKE AND DIP NOTATION 1. Strike notation strike, dip angle (a) N65W, 25 S ("Quadrant") (b) 295, 25 S ("Azimuth") 2. Dip notation dip angle, dip direction (a) 25, S25W ("Quadrant") (b) 25/205 ("Azimuth") 3. ChulalongkornUniversity Style 115/25 S ( DOS = Dip Over Strike ) I am Noob!! CU-DOS

58 HOMEWORK STRIKE AND DIP NOTATION 1. Strike notation strike, dip angle (a) N65W, 25 S ("Quadrant") (b) 295, 25 S ("Azimuth") 2. Dip notation dip angle, dip direction (a) 25, S25W ("Quadrant") (b) 25/205 ("Azimuth") 3. ChulalongkornUniversity Style 115/25 S ( DOS = Dip Over Strike ) I am Pro!! CU-DOS

59 HOMEWORK STRIKE AND DIP NOTATION 1. Strike notation strike, dip angle (a) N65W, 25 S ("Quadrant") (b) 295, 25 S ("Azimuth") 2. Dip notation dip angle, dip direction (a) 25, S25W ("Quadrant") (b) 25/205 ("Azimuth") 3. ChulalongkornUniversity Style 115/25 S ( DOS = Dip Over Strike ) I am Inw!! CU-DOS

60 HOMEWORK STRIKE AND DIP NOTATION 1. Strike notation strike, dip angle (a) N65W, 25 S ("Quadrant") (b) 295, 25 S ("Azimuth") 2. Dip notation dip angle, dip direction (a) 25, S25W ("Quadrant") (b) 25/205 ("Azimuth") 3. ChulalongkornUniversity Style 115/25 S ( DOS = Dip Over Strike ) I am Marine!! ATTITUDE NOTATION Strike (a) N65W, 25 S S65E, 25 S Strike (b) 295, 25 S 115, 25 S Dip (a) 25, S25W Dip (b) 25/205 CU-DOS 115/25 S

61 HOMEWORK I am Geo!! STRIKE AND DIP NOTATION 1. Strike notation strike, dip angle (a) N65W, 25 S ("Quadrant") (b) 295, 25 S ("Azimuth") 2. Dip notation dip angle, dip direction (a) 25, S25W ("Quadrant") (b) 25/205 ("Azimuth") 3. ChulalongkornUniversity Style 115/25 S ( DOS = Dip Over Strike ) ATTITUDE NOTATION Strike (a) N65W, 25 S S65E, 25 S Strike (b) 295, 25 S 115, 25 S Dip (a) 25, S25W Dip (b) 25/205 CU-DOS 115/25 S

62 HOMEWORK STRIKE AND DIP NOTATION 1. Strike notation strike, dip angle (a) N65W, 25 S ("Quadrant") (b) 295, 25 S ("Azimuth") 2. Dip notation dip angle, dip direction (a) 25, S25W ("Quadrant") (b) 25/205 ("Azimuth") 3. ChulalongkornUniversity Style 115/25 S ( DOS = Dip Over Strike ) I am in Practice!! ATTITUDE 65 NOTATION 25 bedding plane vein fault joint other plane Strike (a) N65W, 25 S S65E, 25 S S35W, 15 S Strike (b) 295, 25 S 115, 25 S 080, 50 NW Dip (a) 25, S25W 80, N35E Dip (b) 25/205 45/295 CU-DOS 115/25 S 195/65 N

63 HOMEWORK STRIKE AND DIP NOTATION 1. Strike notation strike, dip angle (a) N65W, 25 S ("Quadrant") (b) 295, 25 S ("Azimuth") 2. Dip notation dip angle, dip direction (a) 25, S25W ("Quadrant") (b) 25/205 ("Azimuth") 3. ChulalongkornUniversity Style 115/25 S ( DOS = Dip Over Strike ) I am in Field!! ATTITUDE 65 NOTATION 25 bedding plane vein fault joint other plane Strike (a) N65W, 25 S S65E, 25 S Strike (b) 295, 25 S 115, 25 S Dip (a) 25, S25W Dip (b) 25/205 CU-DOS 115/25 S

64 Paper models for geology mapwork Index * Strike and dip model * True and apparent dip model * Apparent dip model * 3 point problem * V-rule model * Unconformity model * Fault types * Faults displacing inclined beds * Normal faults and relay ramps * Cross-cutting normal faults * Plunging folds * Fault-propagation and fault-bend fold

65 HOMEWORK

66

67 HOMEWORK

68

69 HOMEWORK

70

71 THANK YOU

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