geologi struktur dasar , Slides of Geology

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Struktur Geologi

(MGD 421)

GDG 8

Program Studi Teknik Geologi Fakultas Teknologi Kebumian dan Energi Universitas Trisakti 2011

• (^) Materi GDG 8  (^) Pendahuluan  (^) PENGERTIAN GEOLOGI, Proses, Hukum  (^) BUMI SEBAGAI PLANET  (^) LITHOSFERA - MINERAL BATUAN : BT, BEKU BT SEDIMEN BT, METAMORP  STRUKTUR GEOLOGI  (^) P E TA  (^) TEKNOLOGI KEBUMIAN

Structural Geology study of the “architecture of the crust” ….by examination of deformed rocks DEFORMATION: changes in location, orientation, shape, volume …results from stresses that exceed rock strength… same material (fence) deforms in different ways ductile (bends) brittle (breaks) from: Davis and Reynolds, 1996

rocks, like the fence, will deform in different ways, depending upon the properties of the rock and the nature of the applied stress folds faults

Earth’s Plates

Model Simple Shear (K.R. McClay, 1987)

Struktur Geologi :

Lipatan : Antiklin

Sesar Naik

Sesar Turun

Sesar Mendatar

Offset Ditch, Hollist er, CA

• 1975

Offset Ditch, Hollist er, CA

• 1992

translation (rigid body) rotation (rigid body) distortion; strain (shape changes) time 1 time 2 kinematic analysis: 4 possible types of movements volume change (dilation, contraction)

from: Davis and Reynolds, 1996 looking at it another way: dilation translation rotation distortion (strain)

Stress-Strain

Shear stress and strain

Structures as a Record of the Geologic Past

Geologic Maps and Field Methods

Strike and Dip Measuring Folds Other Strain Markers

Steepl y Dippin g Beds, Pt. Arena, Ca