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DESCRIPTION
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NORTH-SOUTH GEOLOGICAL CROSS SECTION THROUGH LUH-ULO - KEBUMEN
ACCRETIONARY WEDGE
PALEOGENE BACK-ARC
NEOGENE FORE-ARC
YOGYAKARTA
•
•
•
• •
•
PURWOREJOKEBUMEN
CILACAP
BANYUMAS
N* G.SLAMET
*G.SINDORO
- -
N.KAMBANGAN K.BOLONG - HIGH
040 km
BANJARNEGARA
•WONOSOBO
•
BUMIAYUB E S U K I
L U H - U L O H I G H•
PURWOKERTO
PHYSIOGRAPHIC PROVINCEOF LUK-ULO AREA
CENTRAL JAVA
Geologic field camp
SUNDA PLATE
INDIAN-AUSTRALIANPLATE
3000m
3000m
1000m
A
B
1
2
31. CILETUH2. LUH-ULO3. BAYAT
THREE PLACES IN JAVAWHERE TECTONIC ME’LANGECAN BE OBSERVED
REGIONAL GEOLOGIC ANALYSIS ( TECTONIC )OF LUH-ULO
REGION CENTRAL JAVA
Datacollecting
secondaryprimary
Dataprocessing
started with field observation
TectonicAnalysis
PERVASIVELY SHEAREDMATRIX AND LOZONGES SHAPEBLOCKS OF ROCKS CONSISTING
OF PHYLLITE, BASALT, ANDGREYWACKE
GREYWACKE
BASALT
PERVASIVELY SHEAREDMATRIX AND LOZONGES SHAPE
BLOCKS OR “BOUDINE”OF ROCKS CONSISTING
OF PHYLLITE, BASALT, ANDGREYWACKE
THE LOZONGES SHAPEGREYWACKE HAS GIVEN
THE APPEARANCE OF THESO CALLED
FISH STRUCTURE
IS CHARACTERISTICSOF A MELANGE
THE “BOUDINE” ARE CROSSCUTTED BY PAIRED
SHEARED FRACTURES WITHSLICKENSIDED SURFACE
σ1
IS CHARACTERISTICSOF A MELANGE
DEFINITION :
a structurally chaotic, pervasively sheared tectonic “mixture”of sedimentary, igneous and metamorphic rocks. Shear jointsand horizontal slickensided surfaces are commom.
Individual EXOTIC and NATIVE blocks range from hundredOf meters in extent to indefinitely unmapable small size,floating in a fine matrix consists of black or grey clayto which multiple sets of slickensides has given shearedappearance
GIANT “BOUDINE”
THE “BOUDINE” ARE CROSSCUTTED BY PAIRED
SHEARED FRACTURES WITHSLICKENSIDED SURFACE
TYPICAL INDICATINGCOMPRESSIONALDEFORMATION
MEASUREMENTS ON THEATTITUDE OF CLEAVAGE SURFACESOF MATRIX HAD A PREDOMINANTNORTHWESTERLY DIP
GEOLOGIC SETTING OF LUH-ULO REGIONCOMPRISING BROKEN ROCK FORMATIONS
OF DIFFERENT AGE AND LITHOLOGYREPRESENTING PLATE CONVERGENT
PANORAMIC VIEWTO THE NORTH
LUH-ULO RIVER
GEOLOGIC SETTING OF LUH-ULO REGIONCOMPRISING BROKEN ROCK FORMATIONS
OF DIFFERENT AGE AND LITHOLOGYREPRESENTING PLATE CONVERGENT
LUH-ULO MELANGECOMPLEX
(TECTONIC ME’L.)
TOTOGAN (OLISTOSTROME)FORMATION
(SEDIMENTARY ME’L)
WATURANDA(BRECCIA) FORMATION
(TURBIDITE)
SAWTOOTH MORPHOLOGYINDICATING CONGLOMERATION
OF DIFFERENT LITHOLOGY
PILLOW LAVA(TYPICAL MORB)
RADILARIAN CHERTAND RED LIMESTONE
(TYPICAL DEEP SEA SEDIMENTS)AGE: CENOMANIAN
(BASED ON RADIOLARIA)
OLISTHOSTROMEDEPOSITS
ASSORTMENT OF FRAGMENTALSEDIMENTARY ROCKS UP TO
HUNDRED METERS LONG.
THE LARGER BLOCKS AREPREDOMINANTLY LIMESTONES
AND CONGLOMERATE,FLOAT IN A MATRIX OF GREY
MUDSTONE
JATIBUNGKUS LST(OLISTOLITH)
TECTONIC SETTING AND SEDIMENTATION OF STUDY AREA
1. Late Oligocene - Miocene period ( 20 – 5 Ma ) :During this period, the contemporaneous northward subducting Auastralian plate below Sunda Microplate, shifted from north to south resulting in a East-West trendingmagmatic arc (Fig 1) started from Sumatra in the east to Java and continued eastwardto eastern Indonesia. Luh-Ulo area, most probably develop as an intra arc -
fore arc basin of the system , located on the northern edge of the magmatic arc.
LATE CRETACEOUS –EARLY TERTIARY
LATE TERTIARY
MAGMATIC ARC
MAGMATIC ARC( 35 – 20 Ma )
MEASUREMENTS ON THEATTITUDE OF CLEAVAGE SURFACESOF MATRIX HAD A PREDOMINANTNORTHERLY DIP
IT IS SUGGESTED THAT THE MELANGEHAS BEEN GENERATED BYTECTONIC PROCESSES RELATEDTO THE NORTHWARD SUBDUCTIONOF THE AUSTRALIAN PLATE
EURASIANPLATE
INDIAN-AUSTRALIANPLATE
PACIFIC PLATE
KSU
MA
ICH
AUSTR.
MAGMATICARC
L.CRETACEOUS-PALEOCENE
SUBDUCTION,CILETUH-MERATU’S
SUTURE
50-45 MA
WJCJ
MY BANYUMAS AREA
PEISTOCENE
M I
O C
E N
E
N E
O G
E N
EP
A L
E O
G E
N
PL
I0-
CE
NEL
ME
L
M
E
L
M
E
L
M
E
OL
IGO
CE
NE
EO
CE
NE
PA
LE
O-
CE
NE
1.8
5
11
15.5
22
37.5
43
49
53.5
65
AGE
KARANGSAMBUNGFM
LITHOLOGYTECTONIC
ENVIRONMENTS
CL.BR;SCALY
SCALY CLAY;W.OLISTH.
LUH-ULO ME’LANGECOMPLEX
(117 my)
Glob.angulataGlob.trilloculin.
ACCRETIONARYWEDGE
SUSPENDEDBASIN
SEISMIC DISCONTINUITY
STRATIGRAPHIC SETTINGBANYUMAS (SUB) BASIN
TOTOGAN FM
EXPLANATION
EO-OLIGOCENE MAGM.ARC
EARLY TERTIARY SUBDUCTION
3000m
3000m
1000mAccretionary Basins
Accretionary Ridge
Back Arc Basins
Fore Arc Basin
L.CRETACEOUS – PALEOCENE SUBDUCT.
SUNDA LAND (PLATE)
INDIAN-AUSTRPLATE
SHIFTING OF SUBDUCTION ZONE DURING CENOZOIC
PENOSOGANFM
-•
•
N* G.SLAMET
0 40 km
YOGYAKARTA
CILACAP
+26 MY
++39 MY21-22 MY 26+
*G.SINDORO
•23-28 MY+
PURWOREJO•
BUMIAYU
•PURWOKERTO
ABANJARNEGARA
•WONOSOBO
•
BANYUMAS
•
•
TUF-MARL FM
KEBUMEN
WATURANDAFM
FORE ARCBASINAL AREA
LATE EOCENE EARLY MIOCENEMAGMATIC ARC
GABON FORM.
MY BANYUMAS AREA
PEISTOCENE
M I
O C
E N
E
N E
O G
E N
EP
A L
E O
G E
N
PL
I0-
CE
NEL
ME
L
M
E
L
M
E
L
M
E
OL
IGO
CE
NE
EO
CE
NE
PA
LE
O-
CE
NE
1.8
5
11
15.5
22
37.5
43
49
53.5
65
AGE
KARANGSAMBUNGFM
TOTOGAN FM
GABON FM
WATURANDAFM
LITHOLOGYTECTONIC
ENVIRONMENTS
BR
TF
BRECCIA(AN.BA.COMPON.)TF.BR;
LAPILLI TF.
CL.BR;SCALY
SCALY CLAY;W.OLISTH.
LUH-ULO ME’LANGE
(117 my)
Glob.angulataGlob.trilloculin.
ACCRETIONARYWEDGE
SUSPENDEDBASIN
MAGMATICACTIVITY
BLOCK FAULTING;
INTRA-ARC BASIN
SEISMIC DISCONTINUITY
STRATIGRAPHIC SETTINGBANYUMAS (SUB) BASIN
FLUXOTURBIDITE
PENOSOGANFM
-•
•
N* G.SLAMET
0 40 km
YOGYAKARTA
CILACAP
+26 MY
++39 MY21-22 MY 26+
*G.SINDORO
•23-28 MY+
PURWOREJO•
BUMIAYU
•PURWOKERTO
ABANJARNEGARA
•WONOSOBO
•
BANYUMAS
•
•
TUF-MARL FM
KEBUMEN
WATURANDAFM
FORE ARCBASINAL AREA
LATE EOCENE EARLY MIOCENEMAGMATIC ARC
PENOSOGANFM
EXPLANATION
QUATERNARY MAG.
MIO-PLIOCENE MAGM.ARC
EO-OLIGOCENE MAGM.ARC
MIO-PLIO - QUARTERNARY SUBDUCTION
EARLY TERTIARY SUBDUCTION
3000m
3000m
1000mAccretionary Basins
Accretionary Ridge
Back Arc Basins
Fore Arc Basin
L.CRETACEOUS – PALEOCENE SUBDUCT.
SUNDA LAND (PLATE)
INDIAN-AUSTRPLATE
SHIFTING OF SUBDUCTION ZONE DURING CENOZOIC
PENOSOGANFM
-•
•
N* G.SLAMET
0 40 km
YOGYAKARTA
CILACAP
+26 MY
++39 MY21-22 MY 26+
*G.SINDORO
•23-28 MY+
PURWOREJO•
BUMIAYU
•PURWOKERTO
ABANJARNEGARA
•WONOSOBO
•
BANYUMAS
•
•
TUF-MARL FM
KEBUMEN
WATURANDAFM
FORE ARCBASINAL AREA
PENOSOGANFM
KALIPUCANG FORMATION
MIO-PLIOCENESETTING
M I O - P L I O C E N E - M A G M A T I C ARC
N
S
HALANG FORMATION
EXPLANATION
QUATERNARY MAG.
MIO-PLIOCENE MAGM.ARC
EO-OLIGOCENE MAGM.ARC
MIO-PLIO - QUARTERNARY SUBDUCTION
EARLY TERTIARY SUBDUCTION
3000m
3000m
1000mAccretionary Basins
Accretionary Ridge
Back Arc Basins
Fore Arc Basin
L.CRETACEOUS – PALEOCENE SUBDUCT.
SUNDA LAND (PLATE)
INDIAN-AUSTRPLATE
SHIFTING OF SUBDUCTION ZONE DURING CENOZOIC
MY BANYUMAS AREA
PEISTOCENE
M I
O C
E N
E
N E
O G
E N
EP
A L
E O
G E
N
PL
I0-
CE
NEL
ME
L
M
E
L
M
E
L
M
E
OL
IGO
CE
NE
EO
CE
NE
PA
LE
O-
CE
NE
1.8
5
11
15.5
22
37.5
43
49
53.5
65
AGE
KARANGSAMBUNGFM
TOTOGAN FM
PENOSOGANFM
GABON FM
WATURANDAFM
HALANG FM.
BRECCIAMB. ALT.: SS.; MRL;TF AND BR.
TURBIDITE;SLUMPING
LITHOLOGYTECTONIC
ENVIRONMENTS
BR
TF
KALIPUCANGFM REEF LST;
LOCALLY CLST.
ALT.CLC.SS;LST-MRL-TF
BRECCIA(AN.BA.COMPON.)
TF.BR;LAPILLI TF.
CL.BR;SCALY
SCALY CLAY;W.OLISTH.
LUH-ULO ME’LANGE
(117 my)
Glob.angulataGlob.trilloculin.
ACCRETIONARYWEDGE
SUSPENDEDBASIN
MAGMATICACTIVITY
BLOCK FAULTING;
INTRA-ARC BASIN
SUBSIDENCE;BACK-ARC BASIN
MAGMATIC ACTIVITY;
REGIONAL UPLIFT
SEISMIC DISCONTINUITY
MY BANYUMAS AREA
PEISTOCENE
M I
O C
E N
E
N E
O G
E N
EP
A L
E O
G E
N
PL
I0-
CE
NEL
ME
L
M
E
L
M
E
L
M
E
OL
IGO
CE
NE
EO
CE
NE
PA
LE
O-
CE
NE
1.8
5
11
15.5
22
37.5
43
49
53.5
65
AGE
KARANGSAMBUNGFM
TOTOGAN FM
PENOSOGANFM
GABON FM
WATURANDAFM
HALANG FM.
BRECCIAMB.
POLYMICTBRECCIATAPAK FM
SS; MRL;AND BR.Mlsc.
ALT.: SS.; MRL;TF AND BR.
TURBIDITE;SLUMPING
LITHOLOGYTECTONIC
ENVIRONMENTS
PENIRONFM
BR
TF
KALIPUCANGFM REEF LST;
LOCALLY CLST.
ALT.CLC.SS;LST-MRL-TF
BRECCIA(AN.BA.COMPON.)
TF.BR;LAPILLI TF.
CL.BR;SCALY
SCALY CLAY;W.OLISTH.
LUH-ULO ME’LANGE
(117 my)
Glob.angulataGlob.trilloculin.
ACCRETIONARYWEDGE
SUSPENDEDBASIN
MAGMATICACTIVITY
BLOCK FAULTING;
INTRA-ARC BASIN
SUBSIDENCE;BACK-ARC BASIN
MAGMATIC ACTIVITY;
REGIONAL UPLIFT
FORE-ARC \INTRA-ARC BASIN
SEISMIC DISCONTINUITY
FOLDING