Bentang Alam Struktural
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Transcript of Bentang Alam Struktural
![Page 1: Bentang Alam Struktural](https://reader033.fdocuments.net/reader033/viewer/2022061317/557213b7497959fc0b92db24/html5/thumbnails/1.jpg)
Bentang Alam Struktural
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Lihatlah
Renungkan
Cintai
Amati kembali
Observasi
Interpretasi
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Apa sih…….Bentang alam struktural
itu??
Struktur Geologi
Controlled by
Primer? Sekunder?
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Struktur sekunder When???
Setelah batuan terbentuk
Controlled by
Proses endogenik tektonik
pengangkatan
Patahan/ fault
Lipatan/ fold
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Map identification for Structural Morphology:
Pola penyaluran Lineament, ridge, valley, puncak bukit, dll Aliran sungai
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Jenis Pola Penyaluran yang Dikontrol oleh Sruktur Geologi
Trelis terarah, pada homoklin landai, atau pada pesisir landai dengan gosong pantai (beach ridges)
Rektangular, pada kekar dan/atau sesar yang saling berpotongan tegaklurus,
Angulate, pada kekar dan/atau sesar yang bertemu tidak pada sudut tegaklurus.
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Wildrose Graben, Southern California
Contoh kelurusan
yang diakibatkan oleh proses
geologi
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Perubahan aliran sungai yang
dikontrol oleh struktur geologi
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Macam-macam B.A. Struktural:
dataran
Peg. lipatan
Peg. tersesarkan
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B.A. dengan struktur mendatar (Lapisan
Horizontal)
Dat. Rendah vs Dat. Tinggi ????
Plateau vs Dat. Tinggi ???
Monannock
messa
butte
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Messa………???
t
d
t d<Lapisan horizontal
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Butte………?????
d
t
t d>Lapisan
Horizontal
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B.A. dengan struktur miring
Cuesta VS Hogback…..?Apa bedanya yaa…..
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Cuesta…………….?
φ
Bidang perlapisan
Φ<30°
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Hogback……?
Bidang perlapisan
φ
Φ>30°
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B.A. dengan struktur lipatan
Backslope…..?
Foreslope…….?
Antiklin…….?
Sinklin…….?
Sinklin menunjam…….?
Antiklin menunjam…….?
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Perbukitan lipatan
antiklin
sinklin
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sinklin
antiklin
2 backslope saling berhadapan
2 foreslope saling berhadapan
Interpretasi keberadaan sinklin dan antiklin pada peta topografi
P.P. TRELLIS
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Y = YoungerO = Older
Which folds are anticlines and which are synclines?
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Gambar perbukitan berbelombang lemah yang dikontrol oleh jajaran antiklin dan sinklin (lokasi pengambilan
gambar Alas Kobong, Sragen)
sesar
sesar
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Bagaimana dengan struktur antiklin dan sinklin
menunjam…?
Antiklin menunjam
Sinklin menunjam
3 foreslope berhadapan
3 backslope berhadapan
Interpretasi pada peta topografi
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Lihat peta disamping!Manakah
Antiklin menunjam?Sinklin menunjam?
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Struktur Lipatan Tertutup
1. Foreslope ke arah dalam2. Pola kontur tertutup3. PP radial (stadia muda)4. Pada stadia dewasa:PP annular
Kubah
Kubah VS Cekungan……?
1. backslope ke arah dalam2. Pola kontur tertutup3. PP annular (stadia muda)
Cekungan
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Coba tebak, mana kubah dan mana
cekungan???
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Morfologi dengan struktur patahan/ sesar
Jenis Sesar:Sesar geser
Sesar naik
Sesar turun
? ?Sesar geser dekstralSesar geser sinistral
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Kenampakan sesar turun pada gawir piyungan tepatnya Jl. Wonosari km 18
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Kenampakan asosiasi sesar geser dan sesar naik pada satu singkapan didaerah
Nargotirto, Kendeng
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Gambar profil sayatan geologi yang menunjukkan asosiasi antara antiklin, sinklin, antiklin rebah
dengan sesar naik dan sesar geser
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Identifikasi B.A.Struktural dikontrol sesar
Beda tinggi yang menyolok Resistensi batuan yang beda pada elevasi yg sama Gawir lurus Batas curam bukit vs daratan Kelurusan sungai & membelok tiba-tiba. PP Rectangular, Trellis, dan Contorted serta
modifikasinya Triangular facet
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Kenampakan triangular facet pada gawir pegunungan selatan (Lokasi Jl Imogiri-
Parangtritis)
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Kondisi Morfologi Sebagai Penunjuk Stadia Erosi pada Bentang Alam Struktural
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Sekian…!Terima kasih atas perhatiannya…!
Selamat Belajar!
SMANGAT…!!!