1994 Cretaceous radiolarians from the Luk-Ulo Melange Complex in the Karang.pdf

7/25/2019 1994 Cretaceous radiolarians from the Luk-Ulo Melange Complex in the Karang.pdf

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30 K . W A K I T A et al.

KALIMANTAN

0

JAVA

q P

a y a t

1 2 3 km

i i

Fig. 1. Ma p show ing black) the distr ibu tion of pre-Eocene melange complexes in Java Islan d and K alim anta n.

c o n t a i n s Sethocapsa ? ) sp . i nd ica t ing an Ear ly Cre ta -

ceous age , wh i l e sample R55444 y ie lds Archeod ic tyomi -

tra spp . , and Dictyomi t ra kos lovae F o r e m a n w h i c h

ind ica tes a La te Cre taceous age .

M u n c a r R i v e r

Ba s a l ti c c o n g l o m e r a t e W a k i t a et al. 1991), pebbly

sha le , sha le , s ands tone , cher t , cher t i n t e rbedded wi th

l imes tone , basa l t p i l l ow l ava a re exposed a long the

M u n c a r R i v e r F i g . 8 b) . Re d d i s h b r o w n b e d d e d c h e r t

R5 5 4 5 5 ) c o n t a in s E a r l y C r e t a c e o u s r a d i o la r i a n s s u c h a s

Pseudodictyomitra carpat ica

L o z y n y a k ) a n d

P. l ep to -

conica Fo r e ma n ) . Re d d i s h b r o w n b e d d e d c h e r t i s a d j a -

cen t to redd i sh b rown cher t a l t e rna t ing wi th l igh t g rey

l imes tone which i s i n t imate ly a s soc ia t ed wi th p i l low l avas .

Sample R55456 f rom grey sha le wi th th in in t e rbeds

o f s a n d s t o n e y i e l d s mi d d l e C r e t a c e o u s r a d i o l a r i a n s

Fig. 2. Geolo gic ma p of the Kar ang sam bun g area. 1: Luk -Ulo M elange Complex, 2: ophiol i te complex, 3: diabase Tert iary),

4 - K a r a n g s a m b u n g F o r m a t i o n , 5 : T o t o g a n F o r m a t i o n , 6: W a t u r a n d a F o r m a t i o n , K : K a r a n g s a m b u n g C a m p u s o f R .D .C .G .

for geological t raining.


3/15

Cr e t a c e ous r a d io l a r ia ns f r om the L uk - Ulo M e la nge Com ple x 31

C u r u g d y l / - ~ r . . ~ = . ~ , .

~ iv er M e l i p i t a n ~ / . -- M u n c ~ R i v e r ) I I ~ /

| ~ I ~ ~

Lokid ang River h ~ Y / Sedan,

I ( I ~ f 1 R 5 5 4 5 5 - ~ / . 2 /

__

Wet,

Sigoban R55456

R55449

L . , W @ ~ I /l ~ - , 1 ~ - ~ / Seb. .} - ; - , ~ - t

kwatubarut R 5 5 4 6 7 --/~r ~. ,, ,. .[ R 5~4 62 ( ~ ' ~ ( / / ~ /

) R 5 5 6 8 ~ ' - ' ~ l ) ~ Luk U 1 0 R i v e r (

I

. . . . . W a g i r

- ~ - R 5 5 4 7 4 t ~ l ~

N a t u r e L a b o r a to r y

I Sa mb en g ~ k ~ I For Geology 01. ~, 2kin

Fig. 3. Localities of samples yielding adio larian fossils.

i nc lud ing

Archaeodictyomitra

spp.,

Dictyomitra

sp. and

Cryptamphorella conara

F o r e m a n .

Poor ly p r e se r ve d r a d io l a r i a ns we r e e x t r a c t e d f r om a

shale clast (R55449) in pebbly shale.

Lokidang

I n t he L ok ida n g a r e a c oa r se - g r a ine d c la s ti c r oc ks a r e

assoc ia ted wi th sha le (Fig. 8d) . Four sha le samples

(R55462, R55467, R55468, R55469) yielded radio lar i-

ans . Two samples (R55468, R55469) a re f rom greenish

grey sha le which grad es into red shale, whi le the others

(R55467, R55462) a re f rom d ark g rey sha le wi th thin

inte rbeds of sandstone . Three samples R55467, R55468

a n d R 5 54 69 d o m i n a n t l y co n t a i n A r c h a e o d i c t y o m i t r a

inc lud ing

Archaeodictyomitra simplex

Pe ssa gno a nd A .

sp. cf. A. vulgalis Pessagno assoc ia ted wi th Thanarla

praeveneta Pessagno. Sample R55462 yie lds Dictyomitra

for m os a Squina bo l a n d D . ( ? ) sp. A o f T e r a ok a a nd

Kur im oto ( 1986) . T he f o r m e r t h r e e sa m ple s a r e o f

midd le Cre taceo us age , whi le the la t te r sample i s of ear ly

Late Cre taceous .

Medana River

A black si l iceous rock, that is , chert to si l iceous

sha le , i s exposed jus t nor th of the ophiol i te sequence a t

Mel ipi tan a long the Medana River (Fig. 3) . The lower

par t of the s il iceous ro ck look s cher ty , and i t s uppe r par t

i s s il iceous sha le , inc luding m ore te r r igenou s mater ia ls .

The lower par t (R55517) yie lds wel l -preserved radio-

la r ians inc luding Theocampe urna ( F o r e m a n ) , Dia-

canthocapsa sp., Acaeniotyle sp. aft. A. umbilicata (Rfist)

a n d Stichomitra communis Squina bo l . T he se r a d io l a r i a ns

be long to t he young e s t a s se m bla ge in t h i s a r e a , showing

L a te Ca m pa nia n t o M a e s t r i c h t i a n i n a ge .

Sigoban

I n t he S igoba n a r e a a long t he Cur ugda yu Rive r a

se que nc e c ons i s ti ng o f be dd e d c he r t oc c u r s w i th be dd e d

si l iceous sha le , sha le wi th thin inte rbeds of sandstone ,

a nd p e bb ly sha l e be twe e n a sc h is t b loc k t o t he nor th a nd

an op hiol i te block to the so uth (Fig. 8c) . A grey cher t

sample R55515 yie lded ear ly La te C re taceou s radiola r i -

a ns suc h a s D . fo r m os a Squina bo l , Cryptamphoreila

sphaerica ( Whi t e ) a nd Praeconocaryomma sp.

A dark grey s i l iceous sha le sample R55510 conta ined

Dictyomitra

sp. cf.

D. koslovae

For e m a n , whi l e a da r k

grey sha le (R55508) wi th thin inte rbeds of s i l t s tone

yie lded

D. koslovae D. form osa

Squina bo l ,

Williriedel-

lum sp. T he se two sa m ple s r a nge i n a ge f r om C onia c i a n

to Ca m pa nia n .

Binangun

T wo sa m ple s o f c he r t a t B ina.~gun, we s t o f Ka r a nsa m -

bun g cam pus yie lded radiola r ians (Fig. 3) . L ight green-

ish grey bedd ed cher t (R55472) c rops o ut sou th of

Bina ngun a long the Ca c a ba n Rive r , a nd y i e lde d we l l -

p r e se r ve d L a t e Cr e t a c e ous r a d io l a r i a ns i nc lud ing D .

fo r m os a Squina bo l , D. koslovae F o r e m a n , T. urna ( For e -

m a n) , T. salillum F o r e m a n , a n d Praeconocaryomma

universa Pessagno.

Re ddi sh b r own be dde d c he r t i s e xpose d nor th o f

Bina ngun a long the L uk U lo R ive r . A c he r t s a m ple


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32 K WAKITA

e t a l

R55484 y ie lded Dictyomitra sp. and Novix i tus sp. of late

E a r l y C r e t a c e o u s .

Cacaban River

A l o n g t h e Ca c a b a n R i v e r , a r e e x p o s e d v a r i o u s t y p e s

of rocks , tha t i s, pebb ly sha le , t u rb id i t e , mass ive to

th ick -bedded sands tone , b roken fo rmat ion , red sha le ,

l amina ted sha le , cher t , redd i sh b rown cher t a l t e rna ted

wi th l igh t g rey l imes tone , p i l low basa l t , rhyo l i t e and

sch is t F ig . 9 ) . Red d i sh b rown bedded cher t R55522)

c o n t a i n s

Archaeodictyomitra

sp. and

Praeconocaryomma

sp . Gre y l amina ted tu f faceo us sha le R55503) y ie lded

Archaeodictyomitra spp. , Dictyomitra sp., A mphipy ndax

sp., Williriedellum ?) sp. and Pseudodietyomitra ?) sp.

Red d i sh b row n-p a le g rey sha le R55526) y ie lded well -

p r e s e r v e d L a t e Cr e t a c e o u s r a d i o l a r i a n s s u c h a s

D. for -

mosa

Sq u i n a b o l ,

D. koslovae

F o r e m a n ,

S. communis

Squinabo l ,

A mphipy ndax

?)

c on ic us

N a k a s e k o a n d

N i s h i mu r a ,

T. urna

Fo r e ma n ) ,

T. salillum

F o r e m a n ,

Pseudoaulophacus

sp. cf.

P. pargueraensis

Pessagno ,

Pseudoaulophaeus

sp. cf.

P. lenticulatus

Whi te) and

Cryptamphorella macropora

Dumi t r i ca . Rad io la r i ans in

redd i sh b rown sha le R55521) were poo r ly p reserved ,

bu t inc lude

Dictyomitra

sp. cf.

D. formosa.

V e r y g o o d o u t c r o p s o f r e d d i s h b r o w n c h e r t a l t e r n a t e

wi th g rey l imes tone a t Wagi r Sambeng . A cher t sample

R5 5 4 7 4 ) f r o m W a g i r Sa mb e n g c o n t a i n s mi d d l e Cr e t a -

ceous rad io la r i ans such as

C. sphaerica

White) ,

Spongo-

capsula

sp.,

Novix i tus

sp. and

Alievium

sp.

R A D I O L A R I A N A S S E M B L A G E

Five rad io la r i an assemblages a re recogn ized in the

K a r a n g s a mb u n g a r e a a s s h o w n i n T a b l e 1 .

Assemblage I f rom sample R55455 inc ludes

P. lepto-

conica F o r e m a n ) a n d P. carpatica L o z y n y a k ) . T h e s e

spec ies ind ica te Ear ly Cre tac eous age up to Barremian) .

Th i s as semblage i s the o ldes t in the rad io la r i an assem-

b lage ob ta ined f rom th i s a rea .

A s s e mb l a g e I I i s c h a r a c t e r i z e d b y t h e d o mi n a n c e o f

the Archaeodictyomitra a n d Thanarla such as Archaeod-

ictyomitra

sp. cf.

A. apiarium

Riist), A. sp. cf. A.

pseudoscalaris

Tan Sin Hok) ,

A. s implex

Pessagno , A .

sp. cf.

A. vulgalis

Pe s s a g n o a n d

T. praeveneta

Pessagno .

The rad io la r i ans o f th i s as semb lage a re ex t rac ted f rom

samples R55474 , R55484 , R55468 , R55469 , R55503 ,

R55467 and R55456 . Pessagn o 1977) showed tha t T .

praeveneta

a n d

A. s implex

occur in the Alb ian and

Fig . 4. Ea r ly Cre ta c e ous r a d io la r i a n s of a s se m bla ge I 1-5) a nd m iddle Cre ta c e ous r a d io la r i a ns of a s se m bla ge I I 6-20)

A , B o r C : sc a le b a r 0 . 1 m m ) , R . . . . . . ) : s a m p l e n u m b e r .

1 P capatica L o z y n y a k ) C R 5 5 4 5 5 )

6

7.

8.

9.

I0.

I1.

12.

13.

14.

15.

16.

17.

18.

19.

20.

2 Novixitus

sp.

3 P leptoconica F o r e m a n )

4 Alievium

sp.

5 Praeconocarvomma

A rchaeodict vomitra


Archaeodictvomitra

Archaeodictvomitra

A rchaeodict yomitra

Archaeodict~omitra

Archaeodictyomitra


Amphipyndax sp.

?) sp.

sp.

sp. cf. A vulgaris P e s s a g n o

sp.

sp.

sp.

sp. cf. A apiarum Riis t)

sp. cf. A pseudoscalaris T a n S i n H o k )

sp.

C conara

F o r e m a n )

Pseudodictyornitra ?) sp.

Na sse l l a r i a , ge n . a nd sp . inde t .

Acaeniotyle

sp.

Williriedellum ?) sp.

C sphaerica White )

B R55455)

B R55455)

B R55455)

B R55455)

B R55467)

A R55467)

A R55467)

A R55467)

A R55467)

A R55467)

C R55467)

B R55503)

A R 5 5 5 0 3 )

A R 5 5 4 5 6 )

B R55503)

B R55456)

B R55456)

A R55503)

A R55474)

Fig. 5. Early Late

Cre ta c e ous r a d io la r i a ns

of a s se m bla ge I I I A , B or C : s c a le ba r 0 .1 m m ) , R - - ) : s a m ple num be r .

D j b r m o s a S q u i n a b o l B R 5 5 5 1 5 )

2 D formosa S q u i n a b o l

3 D formosa S q u i n a b o l

4 Archaeodictyomitra sp.




8 Archaeodictyomitra

sp.

9 Archaeodictyomitra sp. cf. A apiarum Riis t)

I0.

Archaeodictyomitra

sp.

I 1 Stichomitra

sp.

12 Theocampe

sp.

13. Nasse l lar ia , gen. an d sp. indet .

14. Nasse l lar ia , gen. and sp. indet .

15 Praeconocaryomma sp.

16. Praeconocaryomma sp.

17. C sphaerica W h i t e )

18. Cryptamphorella sp.

C R55515)

B R55462)

A R55462)

C R55515)

A R55462)

A R55462)

A R55462)

A R55462)

A R55462)

B R 5 5 5 1 5 )

A R55515)

A R55515)

A R55515)

B R55515)

B R55515)

A R 5 5 5 1 5 )

A R 5 5 5 1 5 )


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Cretaceous radiolarians from the Luk-Ulo Melange Complex 37

C e n o m a n i a n . S c h a a f 1 9 8 1 ) s h o w e d t h a t A. pseudo

scalaris

occu rs in the Barrem ian. Th is as s em blag e

i n d i c a t e s m i d d l e C r e t a c e o u s a g e .

A s s e m b l a g e I I I i n s a m p l e s R 5 5 5 1 5 a n d R 5 5 4 6 2 i s

c h a r a c t e r i z e d b y t h e o c c u r r e n c e o f

D. formosa

S q u i n -

a b o l , l a c k i n g

D. koslovae

F o r e m a n . T h e r e f o r e , t h i s

a s s e m b l a g e i s c o n s i d e r e d o f e a r l y L a t e C r e t a c e o u s a g e .

A s s e m b l a g e I V i n c l u d e s D. f ormosa S q u i n a b o l , D .

koslovae F o r e m a n , T. urna F o r e m a n ) , T. salill um F o r e -

m a n , S. communis S q u i n a b o l , Novixitus sp. , Alievium

s pp. , P. uni versa P e s s a g n o a n d Pseudoaulophacus s pp.

S a m p l e s R 5 5 5 2 6 , R 5 5 4 7 2 , R 5 5 4 4 4 , R 5 5 5 1 0 a n d R 5 5 5 0 8

y ie ld th i s as s em blage .

D. formosa

h a s m o r e m a s s i v e

cos tae and a deeper s tr ic ture than thos e des cr ibed by

P e s s a g n o 1 9 7 6 ) .

T. ur na

a n d

T. salil lum

r a n g e i n a g e

from Coniacian to middle Campanian. These fossils

indicate a Coniacian to Campanian age.

Assemblage V from sample R55517 consists of A c a e -

niotyle sp. aft. A. umbilicata Archa eospong oprunu m sp..

aft. A. b ipar ti tum Archaeod ic tyomi t ra spp., Crucella

spp., Dictyomi t ra mul t i cos ta ta Zittel, Diacan thocapsa

sp.,

Novod iacan thocapsa

spp.,

P r a e c o n o c a r y o m m a

spp.,

Pseudod ic tyomi t ra spp. S . communis Squinabol, S. spp.,

T. urna Foreman), T. spp. and Xi tus spp. The assem-

blage contains

D. mul t icostata

Zittel but lacks

D. kos lo -

vae

Foreman and

D . f o r m o s a

Squinabol.

D. mul t icostata

occurs in the middle Campanian to Maastrichtian of

Nor th America Pessagno 1976), while

D. kos lovae

oc-

curs from Santonian to late Campanian. The occurrence

of these species suggests that these assemblages can

Fig . 6. La te Cre ta c e ous r a d io la r i a ns of Asse m b la ge IV A , B , C or D : s ca le ba r 0 .1 m m ) , R . . . . ) : s a m ple num be r .

D formosa S q u i n a b o l C R 5 5 5 2 6 )

2 D formosa S q u i n a b o l C R 5 5 5 0 8 )

3 D formosa

S q u i n a b o l B R 5 5 5 0 8 )

4 D koslovae F o r e m a n B R 5 5 4 7 2 )

5 D koslovae

F o r e m a n B R 5 5 5 2 6 )

6 . Na sse l l a r i a , ge n . a nd sp . inde t . D R55472)

7 Archaeodictyomitra sp. B R55 472)

8 Novixitus sp. B R555 26)

9 T urna F o r e m a n ) A R 5 5 4 7 2 )

10.

T urna

F o r e m a n ) A R 5 5 4 7 2 )

11. T salillum F o r e m a n ) A R 5 5 4 7 2 )

12.

Stichomitra

?) sp. B R555 26)

13. Amphipyndax ?) conicus N a k a s e k o a n d N i s h i m u r a B R 5 5 5 2 6 )

14.

Cryptamphorella

sp. A R555 26)

15. C macropora D u m i t r i ca A R 5 5 5 0 8 )

16. P universa Pe ssa gno B R55472)

17. Praeoconocaryomma sp. C R554 72)

18. Alievium sp. C R555 26)

19.

Alievium

sp . B R55472)

20. Crucella sp. C R555 26)

21.

Pseudoaulophacus

sp. cf.

P pargueraensis

Pe ssa gno C R55526)

22. Pseudoaulophacus sp. cf. P lenticulatus Wh ite ) C R55526)

Fig . 7 . La te s t Cre ta c e ous r a d io la r i a ns of Asse m bla ge V sa m ple : R55517) A , B or C : s c a le ba r 0 .1 r a m ) .

I Archaeodictyomitra

sp, B

2 Archaeodictyomitra sp. B

3 D multicostata Zitte l B



6 Pseudodictyomitra sp. A

7 Parvicinglula ?) sp. A

8 S communis S q u i n a b o l A

9 Stichomitra sp. B

10.

Stichomitra

sp. A

11 Stichomitra sp. A

12.

Xitus

sp. B

13. Nasse l lar ia , gen. an d sp. indet . A

14 Novodiacanthocapsa sp. B

15 Diacanthocapsa sp. A

16. Nasse l lar ia , gen. an d sp. indet . A

17. Nasse l la r ia , gen. and sp. indet . B

18 Viturfos sp. A

19. Pantanellium sp. A

20. Theocampe sp. cf. T urna F o r e m a n ) A

21. T urna F o r e m a n ) A

22. Theocampe sp. A

23.

Theocampe

sp. A

24. Acanthocirus sp. B

25. Acaeniotyle sp. aft. A umbilicata Riis t) B

26. Acaeniotyle sp. B

27. Acaeniotyle sp. B

28. Archeospongoprunum sp. aft. A bipartitum Pe ssa gno C

29. Crucella sp. B


10/15

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F i g . 8 . R o u t e m a p s a l o n g t h e L o n i n g R i v e r ( A ) , t h e M u n c a r R i v e r ( B ) a n d t h e C u r u g d a y u R i v e r ( C ) , a n d i n t h e L o k i d a n g

a rea (D ) . h co n g l o m era te , 2 : s a n d s to n e , 3 : a l t ern a t i n g b ed s o f s a n d s to n e a n d s h a l e , 4 : s h a l e w i th th i n i n terb ed s o f s a n d s to n e ,

5 : sh a l e , 6 : red d i s h b ro w n s h a l e , 7 : l a mi n a ted tu f fa ceo u s s h a l e , 8 : s il i c eo u s s h a l e , 9 : ch er t , 1 0 : a l t ern a t i n g b ed s o f ch er t a n d

l i mes to n e , I 1 : l i mes to n e , 1 2 : p i l l o w l a v a , 1 3 : p eb b l y s h a l e , 1 4 : b ro k en f o rm a t i o n , 1 5 : b a s a l t i c co n g l o m era te , 1 6 : tu ff , 1 7 :

rh y o l i t e , 1 8 : f a u l t zo n e , 1 9 : o p h i o l i t e , 2 0 : s ch i s t , 2 1 : s ch i s t w i th a mp h i b o l i t e l en s , 2 2 : b recc i a t ed s ch i s t , 2 3 : T o to g a n

F o r ma t i o n , 2 4 : l o ca l i ty o f s a mp l es y i e l d i n g ra d i o l a r i a n s , 2 5 : f a u l t .


13/15

Cr e t a c e o u s r a d i o la r i a n s f r o m t h e L u k - U l o Me l a n g e Co m p l e x 4 1

4

0 0 5

1 - -

1 k r n

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R 5 5 5 2 6 . , s . ~ , , ~ ,r s / s s

?/ .~ v : ' ' . . . . . .~

~ , p q s

m ~ " . . ( F sS s r Cgbf

: . : a ~

F i g . 9 . R o u t e m a p a l o n g t h e C a c a b a n R i v e r . F o r e x p l a n a t i o n s s e e F i g . 8 .

b e c o n s id e r e d t o b e o f la t e s t C r e t a c e o u s ag e L a t e

Ca mp a n i a n t o Ma a s t r i c h i a n ) .

D I S C U S S I O N

T h e a g e o f s e d i me n t a r y r o c k s o f t h e L u k - U l o M e l a n g e

Complex a re in fer red f rom the rad io la r i ans in th i s

repor t . Cher t samples R55517 , R55455 , R55484 ,

R55474 , R55515 , R55472 , R55522) range in age

f r o m E a r l y Cr e t a c e o u s t o l a te s t C r e t a c e o u s L a t e

Ca m p a n i a n - M a a s t r i c h t i a n ) . T h e s i li c eo u s s h a le s a mp l e

R5 5 5 1 0 ) i s o f L a t e Cr e t a c e o u s Ca m p a n i a n ) . Sa mp l e s

of g reen i sh g rey and redd i sh b row n sha le R55468 ,

R55469 , R55526 , R55444 , R55508) range in age f rom

mi d d l e Cr e t a c e o u s t o L a t e Cr e t a c e o u s Ca m p a n i a n ) .

Gre y tu f faceous sha le R55503) y ie lds midd le Cre tac eous

rad io la r i ans . The dark g rey sha le samples R55467 ,

R55456 , R 55462) as soc ia t ed wi th th in in te rbeds o f sand-

s t o n e r a n g e i n a g e f r o m mi d d l e Cr e t a c e o u s t o L a t e

Cr e t a c e o u s .

T h e s e a g e d a t a o f me l a n g e c o m p o n e n t s c a n r e c o n -

s t ruc t the o r ig ina l success ions befo re they w ere d i s rup ted

a n d i n c o r p o r a t e d i n t h e me l a n g e . A s t h e L u k - U l o

M elange C om plex i s an a ssemblage o f t ec ton ic s li ces , the

pro to l i th o f the melange ma y be recons t ruc ted in each

tectonic s l ice or in several s l ices associated with each

o ther in the f i e ld . The recons t ruc ted success ions in

different local i ties are show n in Fig. 10. Jud ging from the

re la t ion be tween age and l i tho logy , the comple te ly re -

c o n s t r u c t e d s u c c e s s i o n o f t h e L u k - U l o Me l a n g e Co m-

p lex i s composed o f p i l low lava , cher t in t e rbedded wi th

l imestone, bedded chert , hemipelagic shale, and terr ige-

nous sha le and sands tone in ascend ing o rder . The

hemipelagic shale includes s i l iceous shale, tuffaceous

shale and greenish to reddish brown shale. Similar

sequences a re recons t ruc ted by rad io la r i an b ios t ra t ig ra-

phy in the Ju rass i c accre t ionary melange complex in

J a p a n W a k i t a 1 9 8 8 , M a t s u d a a n d I s o z a k i 1 99 1) .

The upward l i tho log ic change f rom cher t in t e rbedded

wi th l imes tone to hemipe lag ic sha le th rough bedded

cher t sugges t s subs idence and the g radual approach o f


14/15

42 K. WAK]TA

e t a l

M u n c a r L o k i d a n

a c a b a n

Sigoban

~ s h ~

r . - . . . . . . . . . . v : . - . - . - . - . . . . . . : . .

:::::::::::::::~. .:::::::::::::

:::::::::::::::::::::::::::::::::::::::

Loning inangun

M e d a n a

Fig. 10. Recons truc ted successions in the Luk-Ulo Melange Complex. The successions become younger towar d the right

hand suggesting younger accretion. The samples at Binangun seem to be derived from two different successions sh: shale

inte rbedded with sands tone rs: reddish brown shale and greenish grey shale tf: tuffaceous shale sil: siliceous shale ch:

chert cl: alternating beds of chert and limestone.

t h e o c e a n i c pl a te t o w a r d s t h e s u b d u c t i o n t r e nc h ( W a k i t a

1 9 8 8, M a t s u d a a n d I s o z a k i 1 9 9 1 ) . T h e s e s e d i me n t a r y

rocks over l ay the p i l low lava be long ing to the ocean ic

p la te . The t ime d i f fe rence be tween p i l low lava and

ter r igenous sha le ind ica tes how long i t t ook fo r p i l low

lava to reach the t rench a f t e r i t s b i r th a t the ocean ic

r idge . The p i l low lava o f the M unc ar River i s o f Ear ly

Cre taceo us (120-130 Myr) , wh i l e the sha le is o f midd le

Cr e t a c e o u s ( 1 0 0 - 1 1 0 M y r ) . T h e p i l lo w b a s a l t o f th e

M u n c a r R i v e r t r a v el le d f o r a b o u t 3 0 M y r u n t i l it w a s

a c c r e t e d a t t h e s u b d u c t i o n t r e n c h . O n t h e o t h e r h a n d ,

t h e p i ll o w l a v a o f t h e Ca c a b a n R i v e r ( W a g i r Sa mb e n g )

i s o f m i d d l e Cr e t a c e o u s ( 1 0 0 - 1 1 0 M y r ) , w h i le t h e

r e d d i sh b r o w n s h a le i s o f L a t e Cr e t a c e o u s ( 7 0 - 8 0 M y r ) .

T h e p i ll o w l a v a o f t h e W a g i r Sa m b e n g a l s o t r a ve l le d f o r

ab ou t 30 M yr un t i l i t reached to the t rench in L a te

Cr e t a c e o u s t ime . I f w e a ss u me t h a t t h e r a te o f mo v e me n t

o f the s ubdu ct ing p la t e i s 10 cm/yr , t he d i s t ance o f the

b i r th p lace o f these p i l low lavas f rom the anc ien t t rench

w a s a b o u t 3 0 0 0 k m . F u r t h e r s t u d y o f t h e L u k - U l o

Me l a n g e Co mp l e x b y p a l e o ma g n e t i s m w i l l b e a b l e

t o d e c i d e t h e d is t a n c e a n d t h e r a t e o f s u b d u c t i o n o f

the downgoing p la t e in th i s reg ion dur ing Cre taceous

t ime.

T h e d u r a t i o n o f s u b d u c t i o n a n d a c c r e ti o n i n th e

L u k - U l o M e l a n g e Co m p l e x c a n b e e s ti ma t e d b y t h e ag e

o f t e r r i g e n ou s r o c k s i n t h e a c c r e t e d s e q u e n c e s me n t i o n e d

abov e . The o ldes t t e r r igenous rock i s the sha le o f midd le

Cr e t a c e o u s a g e i n t h e Mu n c a r R i v e r . T h e y o u n g e s t r o c k

i s the s i l i ceous sha le o f l a t es t Cre tac eous age in the

M e d a n a R i v e r . A s t h e t e r ri g e n o u s r o c k s i n th e a c c r e t e d

sequences a re usua l ly as young as o r s l igh t ly younger

than hemipe lag ic s i li ceous sha le (W aki t a 1988 ) , t he

y o u n g e s t t e r ri g e n o u s r o c k s m a y b e o f l a te s t C r e t a c e o u s

or ear l i est Pa leocene age . These age da ta sugges t tha t the

accre t ion o f p i l low lava and pe lag ic to hem ipe lag ic

s e d i me n t s i n t h e L u k - U l o Me l a n g e Co mp l e x o c c u r r e d

dur ing m idd le Cre taceo us to l a tes t Cre tace ous o r ear l ies t

Paleocene t ime.

T h e L u k - U l o Me l a n g e Co mp l e x i s a n a s s e mb l a g e o f

t ec ton ic s labs and b locks o f sed imen tary , igneou s and

me t a mo r p h i c r o c k s . K e t n e r

e t a l

(1976) reported late

Ear ly Cre taceous foss i l s in l imes tone , the l a t es t Cre ta -

ceous K-Ar age o f sch i s t , and ear l i es t Pa leocene f i s s ion

t r a c k a g e o f q u a r t z p o r p h y r y . T h e L u k - U l o Me l a n g e

Co mp l e x h a s b e e n c o n s i d e r e d t o b e c a u s e d b y t e c t o n i c

mix ing dur ing su bduc t ion (As ik in 1974 , Ha m i l ton 1979) .

N o r ma l a c c r e t i o n a r y p r o c e s s e s , h o w e v e r , c a n n o t c a u s e

the mix ing o f accre ted sed imen t s wi th these metamor-

ph ic and fel si c igneous rocks . The t ec ton ic mix ing o f a l l

c o m p o n e n t s o f th e L u k - U l o Me l a n g e Co m p l e x r a ng i n g

i n a g e f r o m E a r l y Cr e t a c e o u s t o Pa l e o c e n e mu s t h a v e

occurred dur ing Pa leocene t ime, as the complex i s

u n c o n f o r ma b l y o v e r l a i n b y t h e E o c e n e K a r a n g s a mb u n g

Fo r ma t i o n .

Acknowledgements This

paper is one of the results of the exchange

of researchers program for the Joint-Research on the Enhancement

and Application of the Remote Sensing Technology with ASEAN

Countries.

The authors wish to thank Dr S. Suparka Mr Suwijanto and Mr

E. D. Arsadi of the Research and Development Centre for Geotech-

nology Indonesia for their helpful support during the geological

survey and for their suggestion and discussion on the geology of the


15/15

Cretaceous radiolar ians from the Luk UIo M elange Com plex

4

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1994 Cretaceous radiolarians from the Luk-Ulo Melange Complex in the Karang.pdf