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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