K T N I O T L S O N G I Divergent Tectonics BAND U N G · t i t u t t e o b a nd u n g *...

Divergent Tectonics SA-Div-1

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LITHOSPHERICPLATES

STYLE OFRELATIVE

PLATE MOVEMENTAND PLATE

INTERACTIONS

DIVERGENT

MAGMATICACTIVITY

STRUCTURALSTYLE

BASINFORMATION

ANDEVOLUTION

ASSOCIATEDTECTONISM


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DIVERGENT

MAGMATICACTIVITY

STRUCTURALSTYLE

BASINFORMATION

ANDEVOLUTION

EXTENSIONALTECTONIC REGIME

RESULTED IN


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DIVERGENT TECTONIC ANDEXTENSIONAL TECTONIC REGIMES

TECTONIC REGIME DEFINITION :

REGION INFLUENCED BY CERTAINTECTONIC ACTIVITY

RESULTED IN BULK PROPERTIESDEPICTING THE BEHAVIOR

OF CERTAIN TECTONIC PROCESSES

STRUCTURAL PATTERN, ROCK ASSOCIATIONRESULTED FROM SEDIMENTATION -METAMORPHISM AND MAGMATISM

GB. RED SEA


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EXTENSIONALTECTONIC

REGIMEMAIN SOURCE

OF STRESS

- OCEAN RIDGES- CONTINENTAL

MARGINS- PLATEAU

UPLIFTS

• FORCES PRODUCEDFROM SUBDUCTION

• DENSITY IMBALANCES


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EXTENSIONAL TECTONIC REGIME

AREASSOCIATED WITH

DIVERGENT PLATEINTERACTION

CONVERGENT PLATEINTERACTION

OCCURING AT

PLATE MARGINS( PLATEBOUNDARY)

INTRA PLATE

AS WELLAS


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EXTENSIONAL TECTONIC REGIME

ASSOCIATED WITH

CONVERGENT PLATEINTERACTION

COMMONLY FOUND AT

PLATE MARGINS( PLATEBOUNDARY)

INTRA PLATE

FRONT ANDINTRA MAGMATIC ARC

BEHINDMAGMATIC ARC

OCCUPIES


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1. OCEAN RIDGES

2. CONTINENTAL RIFTSOF TYPE - I

3. CONTINENTAL EXENSIONALAT CONVERGENT BOUNDARY;BACK-ARC EXTENSIONAL

4. STRIKE-SLIP EXTENSIONAL

1. CONTINENTAL RIFTSOF TYPE-II

2. INTRAPLATE EXTENSIONALBASINS

PLATE BOUNDARYREGIMES

INTRAPLATEREGIMES


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1. OCEAN RIDGES

2. CONTINENTAL RIFTS





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1. OCEAN RIDGES






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1. OCEAN RIDGES



4. STRIKE-SLIP EXTENSIONAL • DIP SLIP DISPLACEMENTCHARACTERIZED THEFLANKING FAULT SCARPS

• MAKES UP 32.7 % OF THESURFACE AREA

• HIGH HEAT FLOW ALONGTHE RIDGE AXIS

• THE PRESENCE OF ASTHENOSPHERIC MANTLECLOSE TO THE SURFACE


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1. OCEAN RIDGES








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1. OCEAN RIDGES








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1. OCEAN RIDGES



4. STRIKE-SLIP EXTENSIONAL • DIP SLIP DISPLACEMENT

CHARACTERIZED THEFLANKING FAULT SCARPS

INDICATE EXTENSIONNORMAL TO RIFT AXIS

DIFFERENCE IN SPREADING RATE

ACCOMMODATE BY SHORTTRANSFORM FAULTS


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EXTENSIONALAT CONVERGENT


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BACK-ARC BASIN AS EXTENSIONAL AT CONVERGENT


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• CLASSIFICATION

• ORIGIN

• ACTIVE RIFT

-CONSTRUCTIVEPLATE BOUNDARY

- INTRA PLATE

• INACTIVE RIFT -FAILED ARMS;( AULACOGEN )

• MANTLE ACTIVATED

• LITHOSPHERE ACTIVATED(CONDIE, 1982)


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• ACTIVE RIFT


- INTRA PLATE

EAST AFRICAN -RED SEA – GULF OF ADEN

RIFT

LINKS WITH INDIAN OCEAN

MODERN ANALOUGEWITH RIFT SYSTEMWHICH RESULTEDIN THE BREAK UP

OF PANGEA

FLOORED BY OCEANICCRUST;

COMMENCED OPENINGLATE MIOCENE

DIVERGENCE RATE2 CM/Y


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• ACTIVE RIFT


- INTRA PLATE

BAIKAL, AFRICAN RIFT.

EXTENSIONAL TECTONICSRELATED TO THE

COLLISION OF INDIA

NEGATIVE GRAVITY ANOM.;FAULTING IN LATE MESOZ-

TERTIARY

VOLCANISM ACTIVE;


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• ACTIVE RIFT


- INTRA PLATE

RHINE GRABEN (RIFT)

DUE TO ALPINEOROGENY

• COMMENCE IN L.CRETAC.

• EOC.-OLIG0. RIFTING AND SUBSID.• MIO.-PLIO. EXTENSION DECREASED

• M.PLIO. REACTIVATION TO SINISTRAL SH.


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• ORIGIN




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• MANTLE ACTIVATED(BURKE AND DEWEY, 1973)

RIFT

CRUST

LITHOSPHERE

ASTHENOSPHERE

# DOMAL UPLIFT CAUSE OFRIFTING

MANTLE PLUME(“DIAPIR”)

# ABUNDANT VULCANICITY


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• ORIGIN




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CRUST

LITHOSPHERE

ASTHENOSPHERE

RIFT

# EXTENSIONALSTRESS MAXIMUM

DURING BREAK-UPOF CONTINENT

COMMENCE WITHGRABEN AND BASIN

# VULCANISM AT LATER STAGE


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CRUST

LITHOSPHERE

THE EAST AFRICAN RIFTSYSTEM;

RIFT

CONNECTED VIA AFARTRIPLE JUNCTION WITHTHE RED SEA – GULF OFADEN


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THE EAST AFRICAN RIFTSYSTEM;CONNECTED VIA AFARTRIPLE JUNCTION WITHTHE RED SEA – GULF OFADEN

TO THE WEST LINK WITHTHE ATLANTIC

# ASSOCIATED 3 DOMAL UPLIFTAS CENTRES OF ALKALINE

VULCANICITY

ACROSSCENTRAL AFRIKA

TO 2 DOMAL UPLIFTDARFUR AND ADAMAOUA

BY MEANS OF 2 RIFTS :• ABU GABRA AND

• NGAONDERE


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EAST AFRICANRIFT SYSTEM


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“DIVERGENTTECTONIC REGIME”

TERJADI DI WILAYAHPUNGGUNG

TENGAN SAMUDRA


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SISI TIMUR PEG.MERATUSDI CAPAI DARI BENDUNGAN RIAM KANAN

SELAT MAKASAR ANTARAP.KALIMANTAN DAN SULAWESIDIANGGAP SEBAGAI PRODUKPEMISAHAN BENUA YANG MENGHASILKAN MEMISAHNYASULAWESI DARI KALIMANTAN


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POLA KEMAGNITAN BATUANBEKU YANG MELANDASISELAT MAKASSARPOLA DI UATA DAN SELATAN BERBEDA

PENAFSIRAN :


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B A N D U N G* * PEMISAHAN SELAT MAKASAR DENGAN

CEKUNGAN-2 SEDIMEN


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KERAK BENUA

JALUR SESAR

KERAK SAMUDRA


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KERAKSAMUDRA

PUSAT PEMEKARANLANTAI SAMUDRA

DIMULAINYA PROSESPEMISAHAN ANTARA

KALIMANTAN-SULAWESI


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PUSAT PEMEKARANLANTAI SAMUDRA

DIMULAINYA PROSESPEMISAHAN ANTARA

KALIMANTAN-SULAWESI

1. BUKTI GEOLOGIKOMPLEKS ME’LANGE DIBANTIMALA; SUSUNAN DANUMURNYA SAMA DG.MERATU’S

BATUAN DASARNYA TERDIRIDARI BATUAN BEKU DAN METAMORFIS PRA-T

2. BUKTI MORFOLOGIGARIS PANTAI BARAT SULAWESIDENGAN GRS PANTAI TIMURKALIMANTAN

INDIKASI-INDIKASI SULAWESIMERUPAKAN BAGIAN DARIKALIMANTAN :


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TIPEPASIVE CONTINENTAL

MARGIN BASIN


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PERKEMBANGAN LENGKAP DARIDIVERGENT CONTINENTAL MARGIN

K T N I O T L S O N G I Divergent Tectonics BAND U N G · t i t u t t e o b a nd u n g *...

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