Geologi Karangsambung bag Utara

GEOLOGI&KARANGSAMBUNG&
BAGIAN&UTARA&
Nugroho&Imam&Se8awan&
Jurusan&Teknik&Geologi&UGM&
Kuliah&Lapangan&Geofisika&UGM&2014&
Lokasi'Karangsambung'
Smyth'et'al.'(2005)'
Tektonik'Karangsambung'dalam'global'
Tektonik'Karangsambung'
Prasetyadi'(2007)'
[1]&Ban8mala&Complex&
!  Eclogite'and'GrtBGln'rock:'
1.8–2.4'GPa'at'580–650'ºC'
(Miyazaki'et'al.,'1996)'
!  JdBGrtBQz'rock:'
>2.7'GPa'at'720–760'ºC'
(Parkinson,'1998)'
'
[2]&Luk&Ulo&Complex&
!  Eclogite:'
2.0–2.3'GPa'at'365–410'ºC'
(Kadarusman'et'al.,'2007)'
!  JdBQzBGln'rock'
2.2'±'0.2'GPa'at'530'±'40'ºC'
(Miyazaki'et'al.,'1998)'
'
[3]&Meratus&Complex&
!  Mg'CtdBbg.'whiteschist'
~1.8'GPa'
(Parkinson'et'al.,'1998)'
SeVawan'(2013)'
Parkinson'(1998)'
Peta'geologi'Karangsambung'
Prasetyadi'(2007)'
StraVgrafi'daerah'Karangsambung'
Perselingan'batupasirB
batulempung,'napal,'
kalkarenit,'dan'tuff'
Breksi'vulkanik,'
batupasir'dan'lensa'
batugamping'
Breksi'lempung'dengan'
fragmen'basalt,'
batugamping'
nummulites,'batupasir,'
konglomerat'dan'batuan'
vulkanik'Dakah'
Lempung'bersisik'
dengan'lensa'
batugamping'
nummulites,'
konglomerat'polimik,'
batupasir,'batuan'
vulkanik'(Sedimen'
melange)'
Unit'Metamorfik,'
metasedimen'dan'ofiolit'
Karangsambung'
bagian'utara'
KOMPLEK MELANGE LUK-ULO
Eklogit
Gabro
“Boudin”
Rijang
KS-208
Matrik
Serpentinit
Koleksi'foto'C.'Prasetyadi'
Kompleks'melange'
Batuan Beku LAVA BASALT
dengan struktur bantal (pillow)
Batuan Sedimen RIJANG dan
BATUGAMPING MERAH
Edi Hidayat-LIPI Karangsambung
Koleksi'foto'Edi'Hidayat'
Laut'dalam'
Umur'Radiolaria:'Kapur'Awal'–'Akhir'
(Wakita'et'al.,'1994)'
Gabro'di'S.'Lokidang'
Koleksi'foto'Edi'Hidayat'
Prasetyadi'(2007)'
S.'Muncar'
Grt'sekis'biru'
Batuan'
metamorf'di'
Karangsambung'
SerpenVnite'Pucangan'
Koleksi'foto'C.'Prasetyadi'
Grt'sekis'mika'
S.'Loning'
Koleksi'foto'Edi'Hidayat'
Koleksi'foto'Edi'Hidayat'
Batuan'metamorf'di'Karangsambung'
Table 5-1. Summary of the protolith from metabasic rocks from South Sulawesi and Central
Java
Locality
Rock Type
OIB
N-MORB E-MORB
ARC
(n)
South Sulawesi Eclogite
Grt-Gln schist
Ep-Gln schist
(2)
–
(2)
(7)
(3)
–
(3)
(5)
–
(2)
(1)
(2)
14
9
5
Central Java
(1)
(5)
(3)
–
–
–
–
–
(3)
(2)
–
–
(1)
(1)
–
–
–
–
–
–
1
5
4
4
2
Eclogite
Grt-Gln schist
Ep-Gln schist
Grt amphibolite
Amphibolite
! : present, – : absent
(3)'
SeVawan'(2013)'
Petrografi'
SeVawan'(2013)'
Petrografi'OmpBbg.'GrtBGln'schist'
Ilm'
SeVawan'(2013)'
Summary'of'mineral'parageneses'
of'the'eclogite,'OmpBbg.'GrtBGln'schist,'and'Grt'amphibolite'
from'Luk'Ulo'Complex'
+Ph2
SeVawan'(2013)'
P"T'evoluVon'of'OmpBbg.'GrtBGln'schist'from'Luk'Ulo'Complex'
Prograde&stage:&
!  Minimum'temperature:'
Omp'+'Lws'='Gln'+'Ep'+'Qz'+'H2O'[1]'(Evans,'1990)'"'300–
500'ºC'at'0.8–1.9'GPa'
!  Maximum'temperature:'
Stability'field'of'Gln'[2]'(Maresch,'1977)'550ºC'above'1'GPa'
!  Maximum'pressure:'
Ep'+'Ttn'='Grt'(mantle)'+'Rt'+'Qz'+'H2O'[3]&(Manning'and'
Bohlen,'1991)'"'300–600'ºC'at'1.8–1.6'GPa'
'
Prograde&stage:&
Gln'+'Ep'='Grt'(rim)'+'Omp'+'Qz'+'H2O'[4]'(Evans,'1990)'"'
500–550'ºC'at'1.3–1.9'GPa'
&
Peak:&
!  Temperature:'
GrtBCpx'geothermometry'Ravna'(2000),'Powell'(1985),'Ellis'
and'Green'(1979)'
!  Pressure:'
GrtBCpxBPh'geobarometry'Carswell'et'al.'(1997),'Ravna'and'
Terry'(2004)'
" 473–557ºC'at'2.1–2.3'GPa'
Retrograde:&
PetrogeneVc'grids'from'Evans'(1990)'
!  Jd'+'Qz'='Ab'[5]&(Holland,'1993)'"'400–600'ºC'at'1.0–
1.3'GPa'
!  Solid'soluVon'diagram'of'amphibole'[6]&(Otsuki'and'
Banno,'1990)'
NaBCa'amp'+'Ep'+'Qz'+'H2O'='Act'+'Ab'+'Chl'
SeVawan'(2013)'
Kompilasi'P"T'diagram'high"
pressure,metamorphic,rocks,
dari'Indonesia'bagian'tengah'
SeVawan'(2013)'
PetrogeneVc'grids'from'Oh'and'Liu'(1998)'
Mekanisme'pengangkatan'batuan'metamorf'tekanan'Vnggi'
•  The' eclogiteBfacies' metamorphic' rocks'
were' subducted' ' correspond' to' the' depth'
of' 90' km' beneath' conVnental' crust' of'
Sundaland.'
•  The' HighBpressure' metamorphic' rocks' in'
BanVmala' and' Luk' Ulo' complexes' are'
enclosed'in'sheared'serpenVnite.'
•  The' serpenVnites' are' extremely' buoyant'
with'respect'to'the'oceanic'crust'that'have'
been' transformed' to' eclogites' during'
subducVon'and'increasing'their'density.'
•  SerpenVnites' might' be' counterBbalancing'
the' negaVve' buoyancy,' decouple' and'
SeVawan'(2013)' facilitate' exhumaVon' of' the' highBpressure'
rocks' during' a' conVnued' subducVon'
process.'
Volkanik'Dakah'Karangsambung'
SeVawan'(2010)'
KBAr''
•  39.86'±'3.31'Jtl'(diabas'
G.'Parang)''
•  37.55'±'1.96'(basalt'
andesit'G.'Bujil)''
•  26.52'±'1.93'Jtl'(diabas'
Trenggulun'Kidul)''
•  (Eosen'AkhirBOligosen'
Akhir)'(Soeria'Atmadja,'
dkk.,'1994)'
Kali'Jebug'
G.'Parang'
Analisa'geokimia:'
Berasal'dari'magma'koB
geneVs'berafinitas'toleit'
busur'kepulauan'
(SeVawan,'2010)'
Kali'Jebug'
hornfels'
SeVawan'(2010)'
Model'geologi'volkanik'Dakah'
SeVawan'(2010)'
FORMASI(KARANGSAMBUNG(
SCALY&(SLATY&CLEAVAGES)&
PINCH&&&SWELL&/&BOUDINAGES&
FORMASI(TOTOGAN(
BASALTIC&BRECCIAS&
CLAY&BRECCIA&
Koleksi'foto'C.'Prasetyadi'
MODEL(PENGENDAPAN(FORMASI(KARANGSAMBUNG(
SENSOR&
*'TERIMA'KASIH'*'