gerak tektonik
TRANSCRIPT
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GERAK TEKTONIKE v a S u s a n t i , S . P d
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Lapisan terluar bumiterbuat dari suatu
lempengan tipis
keras yang masing-masing
saling bergerak relatif terhadapyang lain
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EARTH’s CRUST terbentuk atas:
• Continental crust (batuan granit)• Oceanic crust (batuan basalt)• Earth’s mantle (mantel bumi)
LITOSFER
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3 ZONA PERGERAKAN LEMPENG TEKTONIK
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Konvergen
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Divergen
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Transform
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a. Lipatan (folding)terjadi karena tekanan yang lemah, tapi
berlangsung terus-menerus
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Jenis lipatan
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b. Patahan (fault)terjadi karena adanya tekanan yang kuat melampaui titik
patah batuan, dan berlangsung sangat cepat
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patahan yang arah lempeng batuannya turun mengikutiarah gaya berat.
Normal Fault
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Reserve Fault
patahan yang arah batuannya naik berlawanan arah dengan gayaberat
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Strike-slip Faultpatahan yang arah lempeng batuannya horisontal berlawanan
arah dengan gaya berat
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Bentuk Patahan
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c. Kekar (joint)terjadi karena pengaruh gaya renggangan, sehingga
batuan mengalami retak-retak tapi masih bersambung
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d. Pelengkungan (warping)gerak vertikal yang tidak merata pada suatu daerah,
khususnya yang berbatuan sedimen
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Basin Midway Geyser Grand Prismatic, Yellowstone National Park Wyoming
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Granitic gneiss dome of Sugarloaf Mountain, Rio de Janeiro
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MISTAKESare meant forLEARN
NOT REPEATING