mmbuat pnmpng stras

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Definisi

Penampang stratigrafi terukur (measured 

stratigraphic section) adalah suatu penampangatau kolom yang menggambarkan kondisistratigrafi suatu jalur, yang secara sengajatelah dipilih dan telah diukur untuk mewakili

daerah tempat dilakukannya pengukurantersebut. Jalur yang diukur tersebut dapatmeliputi satu formasi batuan atau lebih.Sebaliknya pengukuran dapat pula dilakukanhanya pada sebagian dari suatu formasi,sehingga hanya meliputi satu atau lebih satuanlithostratigrafi yang lebih kecil dari formasi,misalnya anggota atau bahkan hanya beberapaperlapisan saja 

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Definisi

 Tujuan:

1. Keterangan litologi terperinci yangmenyangkut tentang jenis, macam, komponenpenyusun, tekstur, kemas, kandungan fosil,struktur sedimen dan lain-lain sifat geologisdari setiap satuan yang terdapat pada jalur

tersebut.

2. Kedudukan dan ketebalan dari setiaplitologi yang dijumpai.

3. Urutan dari semua litologi yang ada serta jenis hubungan dari dua litologi yangberdampingan, apakah selaras, tidak selaras,menyisip, selang seling, bergradasi normal

atau terbalik dan lain sebagainya 

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kolom stratigrafi yang diperoleh dari jalur yang diukur siap dijadikandasar untuk :

1. Penentuan batas secara tepat dari satuan-satuan stratigrafiformal maupun informal, yang dalam peta dasar yang dipakaiterpetakan atau tidak, sehingga akan meningkatkan ketepatandari pemetaan geologi yang dilakukan di tempat dimanadilakukan pengukuran tadi.

2. Penafsiran lingkungan pengendapan satuan-satuan yang ada di

kolom tersebut serta sejarah geologi sepanjang waktupembentukan kolom tersebut.

3. Sarana korelasi dengan kolom-kolom yang diukur di jalur yanglain.

4. Pembuatan penampang atau profil stratigrafi (stratigraphicsection) untuk wilayah tersebut.

5.  Evaluasi lateral (spatial = ruang) dan vertical (temporal = waktu)dari seluruh satuan yang ada ataupun sebagian dari satuan yangterpilih, misalnya saja :

a. lapisan batupasir yang potensial sebagai reservoir.

b. lapisan batubara.

c. lapisan yang kaya akan fosil tertentu.

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Definisi

Ada dua metoda yang biasa dilakukan dalam usaha pengukuran jalur stratigrafi. Metoda tersebut adalah :

• Metoda rentang tali.

•Metoda tongkat Jacob ( Jacob’s staff method ). 

Metoda rentang tali atau yang dikenal juga sebagai metoda Brunton and tape(Compton, 1985; Fritz & Moore, 1988)

“dilakukan dengan dasar perentangan tali atau meteran panjang. Semua  jarak dan ketebalan diperoleh berdasar rentangan terbut. Pengukurandengan metoda ini akan langsung menghasilkan ketebalan sesungguhnyahanya apabila dipenuhi syarat sebagai berikut”:

• Arah rentangan tali tegak lurus pada jalur perlapisan.

• Arah kelerengan dari tebing atau rentangan tali tegak lurus pada arahkemiringan.

• Diantara 2 ujung rentangan tali tidak ada perubahan jurus maupunkemiringan 

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Dapat digeserNaik/ turun

 Tongkat ukurper 10 cm

Bandul klinometer

Busur derajat

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Definisi

Pengukuran ketebalan dengan menggunakan tongkat Jacob(Compton, 1985).

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DefinisiPengukuran ketebalan perlapisan miring padadaerah datar.

  Jalur 1 – 2 t = d sin α

  Jalur 1’‑2’ t = d’ cos Θ sin αα = kemiringan perlapisan

Θ = sudut penyimpangan dari arah tegak lurus jurus

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 JURUSAN TEKNIK GEOLOGI FAKULTAS TEKNIK 

UNIVERSITAS GADJAH MADAMETODE GEOLOGI LAPANGAN TKG 352

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 JURUSAN TEKNIK GEOLOGI FAKULTAS TEKNIK 

UNIVERSITAS GADJAH MADAMETODE GEOLOGI LAPANGAN TKG 352

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 JURUSAN TEKNIK GEOLOGI FAKULTAS TEKNIK 

UNIVERSITAS GADJAH MADAMETODE GEOLOGI LAPANGAN TKG 352

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 JURUSAN TEKNIK GEOLOGI FAKULTAS TEKNIK 

UNIVERSITAS GADJAH MADAMETODE GEOLOGI LAPANGAN TKG 352

BATAS ANTARA

DUA SATUAN

BATAS ANTARA 2 ANGGOTA

DALAM SATU SATUAN

BISA

DIPETAKAN

TERSENDIRI

BISA

DIPETAKAN

TERSENDIRI

TIDAK BISADIPETAKAN

SECARA

TERPISAH

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              S                         

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         A

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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         U                          

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         A

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         N

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              C                         

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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             B

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                                                                                                                                                                                                                                                                                                                                                                                                                                          A                                                                                                                                                                                                                                                                                                                                                                                                                                          N

                                                                                                                                                                                                                                                                                                                                                                                                                                          A

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 JURUSAN TEKNIK GEOLOGI FAKULTAS TEKNIK 

UNIVERSITAS GADJAH MADAMETODE GEOLOGI LAPANGAN TKG 352

KONTAK ANTAR LITOLOGI DALAMSATU SATUAN BATUAN / FORMASI

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 JURUSAN TEKNIK GEOLOGI FAKULTAS TEKNIK 

UNIVERSITAS GADJAH MADAMETODE GEOLOGI LAPANGAN TKG 352

KONTAK ANTAR LITOLOGI DALAMSATU SATUAN BATUAN / FORMASI

Sisipan breksi dalam batupasir  

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 JURUSAN TEKNIK GEOLOGI FAKULTAS TEKNIK 

UNIVERSITAS GADJAH MADAMETODE GEOLOGI LAPANGAN TKG 352 KONTAK ANTAR SATUAN BATUAN / FORMASI

  P  E  N  Y  E

  B  A  R  A

  N  N  Y  A

   D  A  P

  A  T   D  I  P  E  T  A  K 

  A  N

  S  E  C  A

  R  A   T  E  R

  P  I  S  A

  H

  P  E  N  Y

  E  B A  R

 A  N  N  Y

 A   D A  P A

  T   D  I  P  E

  T A  K  A

  N

  S  E  C A

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  P  I  S A  H

SATUAN / FORMASI A

SATUAN / FORMASI B

Pelamparan lateraldari batas harus

dicari / dijejaki

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Definisi

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