Rocks formed from material derived from preexisting rocks by ...
Transcript of Rocks formed from material derived from preexisting rocks by ...
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SIKLUS TERBENTUKNYA BATUAN APADALAPISAN LITOSFIR
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Rocks formed from material derived from preexisting rocks by surfacial processes followed by diagenesis
q There are two main classes of sedimentary rocks
A. Clastic (detrital) sedimentary rocks rocksare formed from bits and pieces of previously
existing existing rocks, called clasts or detritus
B.Chemical sedimentary rocksare formed in several ways
Ø By precipitation from aqueous solutionØ From plant material Ø From animal material
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Aku terkena sinar matahari &kena air hujan sehingga tubuhkusebagian hancur dan tererosi
Kemudian aku diendapkan di tempatyang baru, tapi sebagian tubuhku
terus terbawa
Sisa tubuhku diendapkan disini,oh ternyata sudah ada teman-teman
yang diendapkan disini
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LINGKUNGAN PENGENDAPAN SEDIMEN
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Batuan Sedimen Klastik/Mekanik (Clastic Sedimentary Rock)terbentuk dari pengendapan bahan rombakan batuan asalContoh : breksi, konglomerat, batupasir, batulanau, batulempung
+ Batuan Piroklastik (Pyroclastic Rock)terbentuk dari pengendapan bahan letusan gunungapiContoh : breksi volkanik, aglomerat, ignimbrit, tufa
Batuan Sedimen Non-Klastik (Nonclastic Sedimentary Rock)
berdasarkanberdasarkangenesanyagenesanya
Batuan Sedimen Non-Klastik (Nonclastic Sedimentary Rock)Batuan Sedimen Kimiawi (Chemical Sedimentary Rock)terbentuk dari pengendapan akibat proses kimiawi (evaporasi / presipitasi)Contoh : batugaram (halit), batugipsum, anhidrit, travertin, chert
Batuan Sedimen Organik/Biogenik (Organogenetic Sed.Rock)terbentuk dari pengendapan bahan organis (sisa-sisa hewan & tumbuhan)Contoh : batugamping, batubara, diatomit, radiolarit
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� Batuan Sedimen Detritus Kasar (Coarse ClasticSedimentary Rock)
� Contoh : breksi, konglomerat, kokuina
� Batuan Sedimen Detritus Sedang (Medium Clastic Sedimentary Rock)Clastic Sedimentary Rock)
� Contoh : batupasir, arkosa, grewak
� Batuan Sedimen Detritus Halus (Fine ClasticSedimentary Rock)
� Contoh : batulanau, batulempung, batulumpur, serpih
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q Batuan Sedimen Karbonat (Carbonatic/Calcareous Sed.Rock)
Contoh : batugamping, dolomit, kapur (chalk), kalkarenit
q Batuan Sedimen Evaporit (Evaporite Sedimentary Rock)
Contoh : batugipsum, batugaram, anhidrit, travertin
q Batuan Sedimen Silikaan/Kersikan (Siliceous Sedimentary Rock)
Contoh : batuapi (flint), rijang, jasper, fosforit, diatomit, radiolarit
q Batuan Sedimen Besian (Ferriferous Sedimentary Rock)
Contoh : batu silikat besi, batu oksida besi, batu sulfida besi
q Batuan Sedimen Fosfatik (Phosphatic Sedimentary Rock)
Contoh : fosforit, kolofanit, batugamping fosfatik
q Batuan Sedimen Organik (Organic Sedimentary Rock)
Contoh : serpih organik, batubara, lignit, bituminus, antrasit
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Batuan yang terbentuk dari
proses pengendapan bahan
lepas berupa fragmen
batuan/mineral hasil
perombakan/pelapukan batuan
lain yang terangkut dari tempat
Konglomerat
lain yang terangkut dari tempat
asalnya oleh air, es atau angin,
yang kemudian mengalami
litifikasi/pembatuan.
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1. Besar butir berdasarkan skala Wentworth2. Pemilahan/Sorting (tingkat keseragaman besar butir)3. Kebundaran/roundnes (tingkat kelengkungan dari setiap butiran)4. Kemas/fabric (sifat hubungan antar di dalam suatu masa dasar
PENGELOMPOKAN BATUAN SEDIMEN KLASTIK BERDASARKAN TEKSTUR
4. Kemas/fabric (sifat hubungan antar di dalam suatu masa dasar5. Porositas (perbandingan antara jumlah volume rongga dan
volume keseluruhan batuan6. Fragmen/komponen (material kasar yang membentuk sedimen) 7. Matrix/masa dasar (material halus yang berada antar butiran
sedimen) 8. Cemen/semen (material sangat halus yang merekat/mengikat
butiran)9. Jejak/kandungan fosil
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Tekstur KlastikBesar butir (Grain size)Pemilahan (Sorting)Pembundaran (Roundness)Kemas (Fabric)
Besar butir
Pemilahan
Pembundaran
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MATRIX
FRAGMEN PENYUSUN
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KEMAS/FABRIC BATUAN
SEDIMEN KLASTIK
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PERUBAHAN DARI SEDIMEN URAI MENJADI BATUAN SEDIMEN
(KOMPAK)
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Fosil Radiolariaü Umur Kapur Akhir
ü Ukuran 0.1 mmü Endapan Laut Dalam
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Struktur Klastik/FisikaPerlapisan (Bedding)Perlapisan arus (Current bedding)Perlapisan bersusun (Graded bedding)Perlapisan silang siur (Cross bedding)Perarian sejajar (Parallel lamination)Perarian terpelintir (Convolute lamination)Tikas beban (Load cast)
Graded bedding
Cross bedding
Tikas beban (Load cast)Tikas garut (Flute cast)Gelembur gelombang (Ripple mark)Gerus & Isi (Scour & Fill)Rekah kerut (Mudcrack)
Convolute lamination Flute cast Ripple mark
Mudcrack
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PerlapisanPerlapisan BatupasirBatupasir dandan konglomeratkonglomeratdidi Sungai Sungai LukLuk UloUlo, , didi PesanggrahanPesanggrahan.PerlapisanPerlapisan BatupasirBatupasir dandan konglomeratkonglomeratdidi Sungai Sungai LukLuk UloUlo, , didi PesanggrahanPesanggrahan.
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BatulempungFormasi TotoganBatulempungFormasi Totogan
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BreksiKonglomerat
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SEDIMEN ORGANIK BATUGAMPING
BatugampingBatugamping NummulitesNummulites, , terbentukterbentuk didi lingkunganlingkunganlautlaut dangkaldangkal, , sekitarsekitar 50 50 jutajuta tahuntahun lalulalu..
BatugampingBatugamping NummulitesNummulites, , terbentukterbentuk didi lingkunganlingkunganlautlaut dangkaldangkal, , sekitarsekitar 50 50 jutajuta tahuntahun lalulalu..
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Sedimen pelagic (organik) di Pulau TimorSedimen pelagic (organik) di Pulau Timor
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Amorf AmorphousOlit OoliticPisolit PisoliticSferolit Spheruliticmembungkal Saccharoidal
Membungkal
Pisolit
Sferolit
Olit
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Struktur KimiawiStilolit (Stylolite)Konkresi (Concretion)Septaria (Septaria)
Struktur Organik/BiologiBioherma (Bioherm)Biostroma (Biostrome)
Bioherma
Septaria (Septaria)Geoda (Geode)Kerucut dlm kerucut (Cone-in-cone) Cone-in-cone
GeodaKonkresiStilolit
Septaria
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Kepada ; Bpk Adang Hendarsyah