pendekatan tektonik indonesia Geologi Pngea UPN

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Information about pendekatan tektonik indonesia Geologi Pngea UPN
Engineering

Published on June 25, 2014

Author: hardikaabrianto

Source: slideshare.net

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Lebih dekat mempelajari Tektonik Indonesia

PENDEKATAN TEKTONIK INDONESIA

1. Teori TEKTONIK LEMPENG 2. Litologi Basement: Komposisi & Konfigurasi 3. Tektonostratigrafi 4. Polyhistory PENDEKATAN TEKTONIK INDONESIA

Sedimentary basinsSedimentary basins PLATE TECTONIC & SEDIMENTARY BASIN FORMATION

CONTINENTAL CRUST TRANSITIONAL CRUST OCEANIC CRUST SUTURE CONTINENTAL CRUST CONTINENTAL CRUST TRANSITIONAL CRUST OCEANIC CRUST SUTURE CONTINENTAL CRUST TYPES OF CRUST – INDONESIA REGION

BASEMENT COMPOSITIONBASEMENT COMPOSITION

Indonesia Position Global Plate-Tectonics • The pacific oceanic plate in the E & NE • The Australian continental plate in the SE • The Indian oceanic plate in the W&SW • The Asian continental plate in the NW

• Continental landmass: continental islands and sea shelf: < 200 m • Oceanic Islands and Oceanic Deeps :>200 m INDONESIA: BATHYMETRY

INDONESIA: Continental Landmass • SUNDA SHELF with: • Sumatra, • Java and • Kalimantan • ARAFURA CONTINENTAL SHELF : • Australian continent • Irian Jaya New Guinea

TECTONIC PLATES & CRUSTS IN INDONESIA • WESTERN INDONESIA: STABLE SUNDA CONTINENT • CENTRAL INDONESIA: MICRO-CONTINENTS AND OCEANIC BASINS • EAST INDONESIA: STABLE SAHUL/AUSTRALIAN CONTINENT

• Convergence, (collisions, subduction and obduction). • Divergence (rifting, break-up and subsequent seafloor spreading). • Transvergence (wrench faulting); involving translatation and rotation. PLATE TECTONICS MOVEMENT IN INDONESIA involves:

PLATE BOUNDARIES • ACTIVE MARGINS – SUBDUCTION ZONES – OBDUCTION ZONES – TRANSDUCTION ZONES (Sorong Fault zone) • PASSIVE MARGINS (Eastern Kalimantan) – Delta Basin – Carbonate Platform • COLLISION ZONES & OROGENIC BELTS (Papua & Sulawesi)

ACTIVE MARGINS • SUBDUCTION ZONES: – CONTINENTAL ISLAND ARC: Western Sumatra Sunda Arc, Southern Java Sunda Arc – OCEANIC ISLAND ARC: Nusatenggara Sunda Arc • OBDUCTION/COLLISION ZONES: Banda Arc-Australian continent being subducted under Banda Sea oceanic crust; Banggai-Sula colliding Eastern Sulawesi • TRANSDUCTION ZONES: Sorong Faultzone • Zona subduksi: •   CONTINENTAL ISLAND ARC: Barat Sumatra Sunda Arc, Jawa Southern Arc Sunda •   OCEANIC ISLAND ARC: Nusatenggara Sunda Arc • OBDUCTION / TUBRUKAN ZONA: benua Banda Arc-Australia sedang subduksi di bawah Laut Banda kerak samudera; Banggai-Sula bertabrakan Sulawesi Timur • ZONA TRANSDUKSI: Sorong Faultzone

PASSIVE MARGINS NW BORNEO PASSIVE MARGIN • East Natuna basinal area, Baram Delta • EASTERN KALIMANTAN PASSIVE MARGINS • MICROCONTINENT PASSIVE MARGINS • Southwest Sulawesi Basinal area

COLLISION ZONES & OROGENIC BELTS • Kuching Zone • Meratus Mts Belt • Central Sulawesi Collision Belt • Central Irian Jaya Mt Range

Tectonic Framework of Indonesia • West Indonesia with Sunda Platform acting as a continental core • Central Indonesia consising of fragmented microcontinents represented by Sulawesi and the Banda Arc • East Indonesia with the Arafura Platfrom acting as continental core • Barat Indonesia dengan Sunda Landasan bertindak sebagai inti benua • Indonesia consising pusat microcontinents terfragmentasi diwakili oleh Sulawesi dan Banda Arc • Indonesia Timur dengan Arafura platfrom bertindak sebagai inti benua (Koesoemadinata, 2008)

West Indonesia: ACTIVE MARGINS • To the W and S the Sundaland is bordered by an active margin; consisting of an island arc system with fore arc, interarc and back-arc basins, as the result of a convergence with the Indo-Australia oceanic plate in which the oceanic plate is subducted under the continental plate. • Untuk W dan S Sundaland berbatasan dengan margin aktif; terdiri dari sistem busur kepulauan dengan busur muka, interarc dan back-arc basins, sebagai hasil dari konvergensi dengan lempeng samudera Indo-Australia di mana lempeng samudera yang menunjam di bawah lempeng benua. (Koesoemadinata, 2008)

West Indonesia: PASSIVE MARGINS • The E Sundaland margin, rifting, break-up and sea-floor spreading of the Makassar Strait, and the formation of :  Aulocogene basins followed by deltaic deposition of the Mahakan Delta and Tarakan Delta.  Paternoster Carbonate Platform. • The NW Sundaland margin; resulted from rifting and opening of the S China Sea and associated rifting in the Gulf of Thailand and W Natuna basin. Rifting of the S China sea results in a collision in NW Borneo.

CENTRAL INDONESIA: Fragmented microcontinents between Oceanic basins Consisting of assorted microcontinents, mainly broken off from the Australian Continent, but some belong to the Asian Continent : SW Sulawesi  Sulawesi Island  Banggai-Sula Islands  West Nusa Tenggara Island Arc

Central Indonesia: an assortment or conglomeration of contental fragments oceanic basins and oceanic troughs • Sulawesi Island: an conglomeration of Australian and Asian continental fragments and island arc • Sula-Banggai Island • Halmahera Island-arc • Lesser Sunda Islands, and island-arc as the eastern continuation of the Sunda island arc • Oceanic Basins of Flores sea, Banda sea and Celebes sea Pulau Sulawesi: sebuah konglomerasi fragmen benua Australia dan Asia dan busur kepulauan Pulau Sula-Banggai Pulau Halmahera-arc Kepulauan Sunda Kecil, dan pulau-arc sebagai kelanjutan timur Sunda busur kepulauan Cekungan samudera Flores laut, Laut Banda dan Sulawesi laut

Eastern Indonesia: Major Tectonic Elements • Arafura Shelf: Stable Shelf • Banda Island Arc: Passive to Active Margin (Subduction/Obduction) • Jaya Wijaya Central Range: Orogenic Mountain Range • Sorong Fault Zone: Active wrench fault (transduction)

POLYHISTORY

BASIN EVOLUTION • Sedimentary basins evolved from one to another type • Superimposition of various type of basin on top of the other occurs • Sedimentary sequences of various types of basin can be analysed in tectono-stratigraphical sequences: Cekungan sedimen berevolusi dari satu ke jenis lain Superimposisi berbagai jenis cekungan di atas yang lain terjadi Urutan sedimen dari berbagai jenis cekungan dapat dianalisis dalam urutan tektono - stratigrafi

EXTENSIONAL BASIN DEVELOPMENT • Rifting ----> grabens, half graben basins ---->synrift sedimentation • Break-up -----> aulacogene basins -------> deltaic sedimentation • Drifting -----> passive margin basins ------> passive margin sedimentation • Spreading (oceanic) -----> oceanic basins ----> deep marine sedimentation

EVOLUTION OF RIFT – TO –PASSIVE MARGIN BASIN RIFT-DRIFT

PASSIVE MARGIN BASIN developing into a CARBONATE PLATFORM Contoh: Indonesia Timur –Australian continental margin

EXTENSIONAL TO COMPRESSIONAL REGIME • Drifting -------> passive margin basin sedimentation • Subduction -----> back-arc, inter-arc and fore-arc basins • Obduction --------->foreland basins & fore deeps • Continent to continent collision------> Suture related foreland and fore deep basins Melayang ------- > passive margin cekungan sedimentasi Subduksi ----- > back- arc , antar - busur dan kedepan - busur cekungan Obduction --------- > tanjung cekungan & Deeps kedepan Benua ke benua tabrakan ------ > Jahitan terkait tanjung dan cekungan kedepan dalam

EVOLUTION OF A PASSIVE MARGIN BASIN

TECTONIC INVERSION.• During the transition from extensional to compressional tectonic regime a tectonic inversion, often takes place • Faults are reactivated with inversion of direction of movement • Lower parts of the basin e.g. ‘graben’ are inverted into highs within the sedimentary basin • Inversion is a common feature in Tertiary sedimentary basin on the Sunda Shelf Selama transisi dari rezim tektonik ekstensional ke compressional inversi tektonik , sering terjadi Kesalahan yang diaktifkan dengan inversi arah gerakan Bagian bawah cekungan misalnya ' graben ' terbalik ke tertinggi dalam cekungan sedimen Inversi adalah fitur umum di Tersier sedimen basin di Paparan

TECTONO-STRATIGRAPHY: • To arrange sedimentary strata in its tectonic environment • Tectono-stratigraphic sequences are separated by unconformities which reflects a tectonic event • The tectonics event caused a change in the tectonic environment are e.g. rifting, sagging, collision, uplift, dsb. • Each tectonic environment is characterized by a certain facies association Untuk mengatur sedimen strata dalam lingkungan tektonik yang Urutan tektono - stratigrafi yang dipisahkan oleh bidang ketidakselarasan yang mencerminkan peristiwa tektonik Acara tektonik menyebabkan perubahan dalam lingkungan tektonik adalah misalnya rifting , kendur , tabrakan , mengangkat, dsb . Setiap lingkungan tektonik ditandai oleh asosiasi fasies tertentu

TECTONO-STRATIGRAPHIC TERMS • Pre-Rift • Syn-Rift • Post-Rift, Sag • Passive Margin Deposition (Syn-drift?) • Pre-Orogenic (Pre-Collision) • Syn-Orogenic (Syn-Collision) • Post Orogenic (Post Collision)

EXTENSIONAL TO COMPRESSIONAL REGIME • Drifting -------> passive margin basin sedimentation • Subduction -----> back-arc, inter-arc and fore- arc basins • Obduction --------->foreland basins & fore deeps • Continent to continent collision------> Suture related foreland and fore deep basins

EVOLUTION OF A PASSIVE MARGIN BASIN

PASSIVE MARGIN BASIN developing into a CARBONATE PLATFORM Contoh: Indonesia Timur –Australian continental margin

EVOLUTION OF BASINS RIFT – TO- BACK-ARC BASIN ? ? (Koesoemadinata, 2008)

Evolution of a Back-arc Basin Model (Koesoemadinata, 2008) PRE-RIFT

Evolution of a Back-arc Basin (Koesoemadinata, 2008) SYN-RIFT

Evolution of a Back-arc Basin Model (Koesoemadinata, 2008) POST-RIFT

Evolution of a Back-arc Basin Model (Koesoemadinata, 2008) INVERSION: Syn & Post orogenic deposition

EVOLUTION OF BASINS: FROM RIFT – TO – FORELAND BASIN RIFT-DRIFT-COLLIDE (Koesoemadinata, 2008)

Evolution of the Rift-Drift- Collision Model (Koesoemadinata, 2008) SYN-RIFT

Evolution of the Rift-Drift- Collision Model (Koesoemadinata, 2008) POST-RIFT

Evolution of the Rift-Drift-Collision Model (Koesoemadinata, 2008)

Evolution of the Rift-Drift- Collision Model (Koesoemadinata, 2008)

Evolution of the Rift-Drift-Collision Model INVERSION: Syn & Post orogenic deposition

EVOLUTION OF BASINS: FROM RIFT – TO – FORELAND BASIN RIFT-DRIFT-COLLIDE (Koesoemadinata, 2008)

Western Indonesia Paleogene Rift-Basins

Western Indonesia Neogene Sedimentary Basins

Western Indonesia Tertiary Stratigraphy

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