BAB I Pendahuluan
1.1 Latar Belakang
Secara estimologi geologi berasal dari bahasa Yunani yaitu Geo yang artinya Bumi dan Logos yang artinya ilmu, jadi Geologi adalah ilmu yang mempelajari bumi (Anonim,2012). Menurut Holmes dalam Saragih (2012) menyatakan bahwa geologi merupakan ilmu pengetahuan yang menguraikan tentang evolusi bumi secara menyeluruh beserta penghuninnya. Secara menyeluruh beserta penghuninya, sejak awal pembentukannya hingga sekarang, yang dapat dikenali dapat batuan. Secara umum Geologi adalah ilmu yang mempelajari planet bumu termasuk komposisi keterbentukannya dan sejarahnya. Geologi laut atau disebut juga geologi marine adalah salah satu cabang ilmu
geologi untuk mengetahui komposisinya, struktur dan proses dan proses pembentukan pembentukan dasar laut. Ilmu ini berguna untuk pembangunan struktur di bawah laut maupun pelayaran, seperti pembangunan dermaga, anjungan pemboran minyak, kabel bawah laut, jembatan antar dua pulau dua pulau dsb. Cakupan dari ilmu geologi sangat luas seperti yang tersebut dalam definisinya, yaitu mempelajari bumi seutuhnya. Sehingga untuk memudahkan dalam mempelajari bumi, maka ilmu geologi dapat dipecah menjadi beberapa cabang ilmu geologi semakin bertambah seiring dengan kemajuan ilmu dan teknologi (Anonim, 2009).
LAPORAN EKSKURSI GEOLOGI KELAUTAN 2017
1
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1.2 maksud dan tujuan
Tujuan dan Kegunaan
Adapun tujuan dan kegunaan praktek lapangan yang dilaksanakan di kawasan wisata Mandeh Kabupaten Pesisir Selatan, Sumatera Barat : -
Dapat mengenal jenis-jenis batuan batuan yang terdapat di sepanjang wilayah wisata
Mandeh -
Mengetahui struktur batuan yang tersingkap di sepanjang wilayah wisata Mandeh
Adapun kegunaan dari praktek lapang ini adalah : -
Mahasiswa dapat memahami langsung bagaimana mengaplikasikan materi yang
didapat selama perkuliahan secara langsung di lapangan. -
Mengubah pola pikir mahasiswa untuk terjun langsung la ngsung ke lapangan.
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BAB II Tinjauan Pustaka
2.1 Geologi Regional Kawasan mandeh memiliki gambaran geologi sebagai berikut, yaitu endapan permukaan, di beberapa tempat terdapat endapan rawa, batuan gunung gunung api di perbukitan serta batuan intrusi yang banyak terdapat di daerah tarusan. Secara Umum berdasarkan Peta Geologi Regional Daerah Painan Lembar (Rosidi, dkk 1976), Startigrafi Aie Dingin dan wilayah sekitarnya terbentuk oleh empat (4) satuan formasi batuan mulai dari yang tertua
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Formasi Barisan (Pb-Pbl) berumur Perm tersusun atas batugamping meta-sedimen dan batuan metamorf. Terdapat Terdapat pula urat kuarsa sulfida magmatic pembawa mineral berharga yang terdiri dari : Filit, Batu Kapur, Hornfels dan Metagreywacke. Filit terdiri dari muskovit, serisit, klorit dan kuarsa; tourmalin kecil, epidot, zirkon dan grafit B. Bebatuan Granit (Kgr) berumur mesozokium akhir (kapur) tersusun atas batuan granit sampai granodiorit dengan bintikmineral mafik. Batuan ini diasumsikan sebagai intrusi sebagai intrusi berbentuk stock yang menerobos formasi barisan (batuan sebelumnya) C. Anggota Gunung Api Kuarter (Qv) tersusun atas batuan gunung api dan sedikit batuan sedimen, diantaranya : lava, breksi, breksi tuff, ignimbrite, tuff hablur, tuff sela kebanyakan bersusun andesitandasitan D. Alluvium (Qal) berumur Quarter terdiri atas lanau, pasir , kerikil.
Gambar 2.1
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Peta Geologi Regional (Rosidi, dkk 1976) Berdasarkan Peta Regional Lembar Painan Lembar (Rosidi, dkk)
daerah penyelidikan terbentuk oleh 2 satuan formasi, yaitu :
O Batuan Intrusi
): granit biotit, porfiri kuarsa dan granit grafik. Granit terdapat sebagai Granit (Tgr ): inti di dalam batuan pluton granodiorit di daerah sebelah selatan gunung Kerinci. Granit ini dinyatakan berumur Miosen Tengah karena hubungannya dengan batuan pluton granodiorit.
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Tdb): retas bertekstur diabasan. Tersusun oleh labradorit, augit, diopsit dan Diabas (Tdb): olivin. Beberapa dari diabas ini mengalami kloritisasi. Diabas dinyatakan berumur Tersier Tengah karena menerobos formasi Painan yang berumur Tersier Akhir. Batuan granitan ( Kgr ): ): susunannya berkisar antara granodiorit sampai granit dengan
bintik-bintik mineral mafik, setempat telah terubah. Terdapat sebagai stock. Batuan ini menerobos baik batuan Mesozoikum maupun Paleozoikum dan karena itu dinyatakan berumur Mesozoikum Akhir (Kapur) dan dapat dikorelasikan dengan granit Lassi yang berumur Kapur Akhir di dataran tinggi Padang.
Kd ): ): susunannya berkisar antara diorit hornblende sampai diorit kuarsa, Diorit ( Kd dengan bintik-bintik mineral mafik, terdapat sebagai stock. Setempat terpecah-pecah, terkloritkan dan terubah. Batuan ini menerobos baik batuan Mesozoikum maupun Paleozoikum tetapi tidak menerobos batuan bagian atas formasi Ombilin.
Granit ( Jgr Jgr ): ): susunannya berkisar antara granit biotit hornblende sampai granodiorit
dengan bintik-bintik mineral mafik, plagioklas dari jenis oligoklas, hornblende telah mengalami kloritisasi dan setempat terdapat apatit, terdapat sebagai stock. Granodiorit disimpulkan berumur lebih muda daripada batuan Paleozoikum dan lebih tua daripada formasi Tabir yang berumur Jura, mungkin berumur Jura Awal.
Diorit ( Jr ): ): susunannya berkisar antara diorit hornblende sampai diorit kuarsa dengan
bintik-bintik mineral mafik, secara setempat terkena kloritisasi dan terubah, terdapat sebagai stock. Batuan ini menerobos formasi Palepat dan pluton asam (granit dan granodiorit) tetapi tidak menerobos formasi Tabir yang berumur Jura. Diorit ini disimpulkan berumur Jura Akhir. O Formasi Painan
Tomp Batuan Gunungapi Oligo-Miosen : Batuan gunungapi dengan sejumlah kecil batuan sedimen. BAtuan gunungapi terdiri dari lava, breksi, breksi tuf, tuf hablur, ignimbrit dan tuf sela, kebanyakan bersusunan andesitan dan dasitan. Tuf sela ini
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arkosa, serpih, bituminan, batubara serpihan, batupasir tufan, serpih tufan, tuf andesitan dan breksi tuf. Dalam formasi ini termasuk batuan sedimen berumur Miosen Awal yang mengandung fosil Dicotylendenblad di sebelah selatan G.Kerinci. Umur formasi ini dinyatakan sebagai Oligo-Miosen. tebalnya mencapai 700 m.
Gambar 2.2
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2.2 Struktur Geologi dan Tektonik Baik
lipatan
maupun
sesar
di
lembar
ini
mempunyai
arah
umum
baratlaut-tenggara. Sudut kemiringan dari lapisan batuan pra-Tersier atau batuan Tersier yang didekat daerah sesar biasanya besar. Arah sumbu antiklin dan sinklin batuan Tersier hampir sama dengan arah lipatan batuan pra-Tersier yang mengalasi. Sesar utama di lembar ini adalah bagian dari sesar Sumatera yang berupa sesar geser menganan dan beberapa sesar normal yang berarah baratlaut-tenggara. Sesar utama tersebut ada kaitannya dengan pembentukan bongkah-bongkah turun seperti danau Diatas dan danau Dibawah, lembah-lembah Muaralabuh dan Semurup, kegiatan
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pensesaran. Pensesaran yang terjadi mengontrol pembentukan dan pengembangan cekungan antar gunung di daerah Barisan sendiri. Mungkin selama tektonik Kapur ini serpentinit dan batuan lain yang terkait tersesarkan keatas. Tektonik Tersier diawali kegiatan gunungapi di daerah tinggian Barisan yang menghasilkan erupsi celah berupa tufa yang membawa pecahan-pecahan batuan pra-Tersier, disusul oleh erupsi lava, breksi dan tufa yang bersusunan andesit, kemudian terobosan granit, di cekungan terjadi sedimentasi darat sampai laut dangkal. Dalam jaman Tersier runtunan di bagian bawah merupakan tahap genang laut, sedangkan dibagian atas susut laut. Pada akhir jaman Tersier dimulai lagi kegiatan gunungapi yang bersifat asam yang berlanjut sampai Kuarter dengan susunan dasit-andesit dan basal.
Gambar 2.3
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Gambar 2.3. penunjaman 2 lempeng (handokoblogger)
Gambar 2.4
Lokasi Penelitian
Gambar 2.3. Peta kabupaten pesisir selatan (administrasisumaterabarat2014)
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3.5
Waktu Dan Tempat
Praktik lapang dilaksanakan pada hari Senin tanggal 22 Mei 2017. Kawasan Mandeh berada di Kecamatan koto XI Tarusan, Kecamatan Tarusan, Kabupaten Pesisir se latan, Sumatera Barat. 3.6
Alat dan Bahan
Adapun alat-alat
yang digunakan dalam pengambilan data yaitu :
- Palu geologi, untuk membantu mengambil sampel batuan. - Kantong sampel, untuk memasukkan sampel batuan. - Sepatu boat, sebagai perangkat keamanan. - Pisau, untuk memotong. - Alat-alat tulis 3.7
Prosedur Pengambilan Data Lokasi pengambilan data-data batuan yang berada di Pantai Angsana
adalah di setiap garis pantai di daerah tersebut. Adapun prosedur yang dilakukan pada saat pengambilan data di lapangan yaitu: - Mempersiapkan semua fasilitas (baik alat, bahan maupun perangkat keamanan) yang dipergunakan untuk pengambilan data batuan. - Mengamati dam mendokumentasikan jenis batuan yang ada di sepanjang garis pantai Pantai Angsana. - Melakukan pengambilan sampel batuan di sepanjang garis pantai.
Prosedur kerja yang dilakukan setelah pengambilan data di lapangan adalah
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BAB IV Pembahasan
Morfologi pantai secara sederhana dapat diartikan sebagai bentuk pantai. Morfologi pantai merupakan daerah yang selalu mengalami perubahan oleh karena ada banyak proses yang terjadi di dalamnya baik itu proses yang berawal dari daratan maupun dari lautan, kedua proses tersebut bertemu di pantai. Perubahan tersebut dipengaruhi oleh banyak hal seperi pasang surut, gelombang, arus laut, jenis batuan, dan lainnya. Namun, secara sederhana, perubahan geomorfologi pantai diakibatkan oleh dua kejadian alam yang disebut dengan abrasi dan sedimentasi. gambar 3.1 menunjukkan perubahan yang dapat terjadi pada morfologi pantai akibat dari erosi atau sedimentasi.
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Abrasi adalah proses pengikisan pantai oleh tenaga gelombang laut dan arus laut
yang bersifat merusak. Beberapa perubahan morfologi pantai yang terjadi akibat abrasi antara lain:
Notch, Notch, Cliff dan dan Wave – cut cut PlatformCliff PlatformCliff adalah
bentuk
lereng
terjal yang menyerupai dinding; yaitu bagian yang ditinggalkan setelah suatu massa batuan longsor (landslides (landslides)) oleh gaya beratnya sendiri. Sebelum cliff terbentuk, dimulai dengan pembentukan notch yang
merupakan
hasil
pekerjaan
gelombang (abrasi). Notch (abrasi). Notch yaitu bentuk cekungan kaki lereng (profil) yang menghadap ke arah laut, pada zona pasang-surut dan garis tengahnya secara horizontal memanjang sejajar dan selevel dengan garis pantai/muka laut di saat pasang.Ada dua tipe cliff. Tipe yang pertama bentuknya tegak atau miring ke
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Wave – Wave – Cut Cut Platform
Beach Cliff
Sea Cave, Blow Hole dan Inlet Perbedaan Perbedaan kekerasan batuan; ada batuan yang lembut dan yang lainnya keras, memberi perbedaan dalam kecepatan pengikisan. Bagian-bagian batuan
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Sekali gelombang sempat membuat suatu lubang, maka kekuatan atau daya tekanan dari benturan gelombang akan semakin intensif dan efisien terhadap lobang tersebut. Suatu lobang yang berbentuk corong yang mengarah ke arah datangnya gelombang, akan memberi peluang terfokusnya tekanan gelombang untuk memperhebat daya benturannya. Kondisi yang demikian akan lebih dipertajam daya kikisnya bila di dalam gelombang itu termuat butiran-butiran material keras. Makin luas mulut suatu gua di dinding pantai, makin banyak pula massa air gelombang yang membentur ke dalamnya. Tekanan benturan dan pukulan gelombang semacam ini di saat badai mampu menggetarkan (microseismic (microseismic)) dan meremukkan kompleks batuan cadas di sekitarnya. Lambat laun muncratan air menembus hingga ke permukaan tanah di atasnya (headland (headland ) dan membentuk blow hole. Dua macam lubang besar ini (cave ( cave dan blow hole) hole) diberi nama sesuai dengan posisinya. Cave atau gua laut karena posisinya yang horizontal mengarah ke laut; sedangkan blow hole adalah lubang yang tegak lurus, seperti dolina dolina di daerah karst. Bentukan blow hole hole dipercepat oleh benturan langsung gelombang, dan juga oleh semprotan (muncratan), getaran, pelapukan dari atas dan gravitasi yang menjatuhkan batuan di atasnya.
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Tanggal dan hari
: Senin, 22 mei 2017
Waktu
: 10.00 wib
Cuaca
: cerah
Stasiun Stasiun
: Stasiun Stasiun 1A Pulau Setan
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Tanggal dan hari
: Senin, 22 Mei 2017
Waktu
: 01.30 wib
Cuaca
: cerah
Stasiun Stasiun
: Stasiun Stasiun 2 Pulau Pulau Siron Siron on ketek ketek
PENARA CONE
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Tanggal dan hari
: Selasa, 23 mei 2017
Waktu
: 03.00 wib
Cuaca
: cerah
Stasiun Stasiun
: Stasiun Stasiun 3, Air ter un Gemuruh
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Tanggal dan Hari
: 22 Mei 2017 / Senin
Cuaca
: Cerah
Koordinat
: 1o12’45” S/ 100 o25’3,5” E
Stasiun
: 1A (Pulau Setan)
No. No
Jenis
Pilihan
Deskripsi
Foto
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Tanggal dan Hari
: 22 Mei 2017 / Senin
Cuaca
: Cerah
Koordinat
:
Stasiun
: Stasiun 1B puncak Puvy
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Tanggal dan Hari
: 22 Mei 2017 / Senin
Cuaca
: Cerah
Koordinat
:
Stasiun
: Stasiun 2 Pulau sironjong ketek
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Tanggal dan Hari
: 22 Mei 2017 / Senin
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3. Diharapkan mahasiswa dapat mengaplikasikan ilmu yang telah didapat pada
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