Download SESAR NAIK

SESAR NAIK
Arie Noor Rakhman, S.T., M.T.
Batasan
• Sesar yang dinding menggantungnya
(HANGING WALL) bergeser NAIK
relatif terhadap dinding kaki (FOOT
WALL)
• Menunjukkan terjadinya Pemepatan
Kerak Bumi
Plate Tectonics
Convergent Boundary: Subduction
Melting
Produces
More
Felsic
Magma
Results in the formation & growth of Continental Crust
and destruction of Oceanic Crust
Plate Tectonics
Convergent Boundary: Collision
Results in the growth of Continental Crust
Relationships between the orientation of the principal stresses (stress
regimes) and tectonic regimes according to Anderson (1951).
Stereonets show fields of compression (P) and tension (T).
Sifat UMUM
• Kemiringan bidang sesar pada umumnya kecil
(THRUST FAULT) ≤ 44⁰
• Kemiringan bidang sesar bersudut besar
(RESERVE FAULT) ≥ 46⁰
• Jalur sesar SULIT dikenal karena rumit dan
rentan erosi  kedudukan sukar ditentukan
• HANCUR  LONGSOR  EROSI
• GERAK GESER & EROSI  produknya
tercampur
Lipatan
Compressive
Forces…
Folds axis are
perpendicular to the main
direction of compression
Folds and Thrust have the
same origin
Folds and Faults
Folds and thrust are both responsible for
the orogens
R.W.H. Butler
Fold-thrust complex developed in Upper Jurassic limestones in the
Haut Giffre area of the Subalpine thrust belt (Morcles nappe in France)
Struktur Penyerta
• Seretan/ normal drag
• Roll over drag  menggelinding
Sesar / Patahan (Faults)
Reverse or Thrust Fault (Sesar Naik)
Small thrust fault, Las Vegas, NV,
Source: M. Miller, U. of Oregon
Sifat KHUSUS
• BATOLIT dan SESAR NAIK (high angle)
• SESAR NAIK akibat EROSI  biasanya
terdapat di daerah dengan pengaruh
dominan tekanan kompresif 
daerah lipatan
Istilah dalam Sesar Naik
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Thrust fault
Back – limb thrust
Break thrusts
Step – bedding – plane thrusts
Erosion thrusts