• Save
Structural Geology and Geomorphology through Remote Sensing
Upcoming SlideShare
Loading in...5
×
 

Structural Geology and Geomorphology through Remote Sensing

on

  • 667 views

Study of Structural Geology and Geomorphology of the Area. Structures mark on satellite image of Landsat-7 in Karachi west.

Study of Structural Geology and Geomorphology of the Area. Structures mark on satellite image of Landsat-7 in Karachi west.

Statistics

Views

Total Views
667
Views on SlideShare
667
Embed Views
0

Actions

Likes
1
Downloads
0
Comments
0

0 Embeds 0

No embeds

Accessibility

Categories

Upload Details

Uploaded via as Microsoft PowerPoint

Usage Rights

© All Rights Reserved

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Processing…
Post Comment
Edit your comment

Structural Geology and Geomorphology through Remote Sensing Structural Geology and Geomorphology through Remote Sensing Presentation Transcript

  • GEOMORPHIC AND STRUCTURAL STUDY OF SONA PASS AND LAL BAKHAR AREA NEAR HUB RIVER Hafiz Uzair Ahmed Khan
  • SEQUENCE  Objectives of the study  Brief description of various geological features marked on the image  Methodology  Geological and geomorphic map of the study area  Result and conclusion
  • OBJECTIVE  Identify the following structures on satellite image:     Normal, reverse, and lateral faults Synclines and anticlines, both non-plunging and plunging. State the direction of plunge where relevant. The axis of a fold.  To mark major Geomorphological structures.  Use of Landsat 7 imagery for above studies.
  • STUDY AREA The targeted area is located at the southern end of Kirthar Fold Belt which in turn is located to the west of the Karachi city. The area belongs to Survey of Pakistan topographic sheet/map No. 35 L/13.
  • THE FORMATION A mappable rock unit
  • ATTITUDE OF FORMATION STRIKE For an inclined plane the strike is the compass direction of any horizontal line on the plane. Simply it is a reference line. DIP The dip is the angle between a horizontal plane and the inclined plane, measured perpendicular to the direction of strike.
  • FOLDS Undulation in rocks
  • FOLDS  Rocks are bent by crustal deformation into a series of wave-like undulations called folds.  Most folds result from compressional stresses which shorten and thicken the crust.
  • COMMON TYPES OF FOLDS    Anticline – Upfolded or arched rock layers. Syncline – Downfolds or rock troughs. (Think “sink”) Depending on their orientation, anticlines and synclines can be described as     Symmetrical Asymmetrical Overturned fold Plunging
  • Anticline
  • Syncline
  • PLUNGING FOLDS An anticlinal axis that is tilted is said to pitch or plunge. The angle of plunge is the angle between the anticlinal axis and a horizontal plane. Plunging anticlines can be thought of as elongated domes. Synclinal axes may also plunge.
  • FAULTS Fracture In Rocks
  • FAULTS  Breaks in rock that exhibit offset.  Exist at a variety of scales.  Sudden movements along faults are the cause of most earthquakes.  Classified by movement…  Horizontal  Vertical  Oblique
  • FAULT TYPES  Dip-slip faults – Motion is parallel to fault dip.  Strike-slip faults – Motion is parallel to fault strike.
  • STRIKE SLIP FAULT IN AN AERIAL PHOTOGRAPH NEAR LOS VEGAS
  • IMPORTANCE OF GEOLOGICAL STRUCTURES  Economic Geology        Petroleum Geology Mining Geology Faults are permeable zones for hydrothermal fluids Veins of minerals occupy faults and fractures It effect the stability of human engineered structures Earthquakes: by combination of Geology and Geomorphology Steep slopes are potential collapse and Landslide hazards
  • METHODOLOGY  Geologic Structures are visually interpreted after studying the tectonics of the area.  Strike slip faults are evident due to the displacement of ridges.  Folds are marked with the help of attitude of formations.  Different types of ridges are marked on the basis of slope angle.  All the observable Geologic and Geomorphic features are marked on the satellite image.
  • SCARP AND DIP SLOPE In geology, the two slopes comprise an escarpment  The scarp is the steep slope which cuts across the bedding planes of the sedimentary rock.  The dip is the gentle slope which follows the direction of the strata. Such features are common when sedimentary rocks are uplifted, folded, or eroded.
  • DRAINAGE TYPES AND GEOLOGICAL SIGNIFICANCE TYPE DESCRIPTION GEOLOGICAL SIGNIFICANCE Irregular branching of Homogenous material and DENDRITIC streams, haphazardly, crystalline rocks: horizontal beds; resembling a tree. gentle regional slope. RADIAL Stream originating from a central point of region. Volcanoes, domes, igneous intrusions; residual erosion features.
  • TYPES OF RIDGES Hogback are symmetrical forms that develop where the strata dip very steeply at 40 degrees plus. Homoclinal ridges, or Strike ridges, are only just asymmetrical and develop in strata with a dip between10 and 30 degrees.
  • RESULT AND CONCLUSION  Landsat data revealed to be capable of depicting large scale geological and geomorphic structure.  Small scale geologic features e.g. beds, --------are not visible on the image.  Topographic data is essential for detail geomorphic studies.