TEKTONOSTRATIGRAFI BUSUR BANDA LUAR DENGAN REFERENSI BAGIAN BARAT TIMOR LESTE DAN BAGIAN TIMUR PULAU SERAM
DOI:
https://doi.org/10.33332/jgsm.geologi.v21i2.135Abstract
Timor and Seram Islands are parts of the Banda Outer Arc which represent a collision zone between Northwest Shelf of Australia and the subduction system of the pre-collisional Banda Arc. Consequently, the rock units in this region can be catagorized into three different tectonostratigraphic sequences which represent differents origins. The first sequence is called the para-autochtonous sequence which is derived from NW Shelf of Australia, and is still lying on its basement, since the basement also moving northwards together with its sediment cover. The second sequence is pre-collisional Banda forearc sequence, and is called the allochtonous sequence, which overthrust on to the para-autochtonous sequence forming nappe structures. The third sequence is autochtonous sequence which is unconformably overlying the para-autochtonous and allochtonous sequences. The Bobonaro Complex in western part of Timor Leste can be compared with the Salas Complex in the Seram Island which represent the oldest aotochtonous unit forming olistostrom deposits. On the other hand, ophiolites in western part of Timor Leste can be compared with ultramafics rocks in eastern part of Seram Island, forming the basement of the allochtonous sequence. Meanwhile, the Lolotoi Complex in western part of Timor Leste can be correlated with the Kobipoto Complex in estern part of Seram Island, which form the basement of the para-autochtonous sequence.
Key words: Para-autochtonous sequence, allochtonous sequence, autochtonous sequence, Banda outer arc, wester part of Timor Leste, Eastern part of Seram Island
Downloads
References
Audley-Charles, M.G., 1968. The Geology of Portuguese Timor. Mem. Geol. Soc. Lond.4.
Bachri, S. 1994. Discussion on lithotectonic packages of the Dili Quadrangle (1:250,000), East Timor. Makalah dipresentasikan pada Seminar Hasil Penelitian / Pemetaan Geologi dan Geofisika 1993/1994, Puslitbang Geologi, Bandung.
Bachri, S. & Partoyo, E., 1995. Geology of the eastern part of Timor. Pertamina – Mobil Oil – GRDC East Indonesia Project, East Timor. Unpub report, 28 pp.
Bachri,S. & Situmorang, R.L., 1994. Peta Geologi Lembar Dili, Timor Timur, skala 1:250.000, Puslitbang Geologi, Bandung.
Bachri, S., 2004. The relationships between the formation of the multi-genesis chaotic rocks and the Neogene tectonic evolution in Timor. Jour. Geol. Resources, 14 (3) : 94-100.
Bachri, S. & Partoyo, E., 1995. Geology of the eastern part of Timor. Pertamina Mobil Oil- GRDC, East Indonesia Project, East Timor. Unpub. Report.
Bachri, S. & Situmorang,R. L., 1994. Peta Geologi Lembar Dili, Timor Timur, skala 1 : 250.000. Puslitbang Geologi, Bandung.
Barber, A.J., Tjokrosapoetro, S. & Charlton, T.R., 1986. Mud volcanoes, shale diapers, wrench faults and mélanges in accretionary complexes, estern Indonesia. Bull. Am. Petrol. Geol. 70 : 1729-1741.
Berry, R.F. & Grady, A.E., 1981. Deformation and metamorphism of the Aileu Formation, north coast, Timor, and its tectonic significance. J. Struct. Geol. 3 : 143-167.
Brown, M. & Earle, M.M.,1983. Cordierite - bearing schist and gneisses from Timor, eastern Indonesia: P – T conditions of metamorphism and tectonic implications. J. Metamorph. Geol. 1 : 183-203.
Brunschweiler, R.O.,1977. Note on the geology of eastern Timor. BMR Bull. Aust. Geol. Geophys. 192: 9-18.
Cardwell,R.K. & Isacks, B.L., 1978. Geometry of subducted lithosphere beneath the Banda Sea in eastern Indonesia from seismicity and fault plane solutions. J. Geophys. Res., 83 : 2825-2838.
Gafoer, S., Suwitodirdjo, K. dan Suharsono, 1984a. Peta Geologi Lembar Bula dan Kepulauan Watubela, Seram, skala 1 : 250.000. Puslitbang Geologi.
Gafoer , S., Suwitodirdjo, K. dan Suharsono, 1984b. Laporan Geologi Lembar Bula dan Kepulauan Watubela skala 1 : 250.000. Puslitbang Geologi.
Hamilton, W., 1979. Tectonics of the Indonesian Region. U.S. Geol. Surv. Professional Paper 1078. US Govt. Printing Office, Washington.
Hasibuan, F., 1994. Globiella foordii (Etheridge) spesies brachiopoda Perem dari Formasi Maubisse, Timor Timur. Pros. Seminar Hasil Penelitian / Pemetaan Geologi dan Geofisika 1993/1994, Puslitbang Geologi, Bandung.
Partoyo, E., Hermanto, B. & Bachri, S., 1995. Peta Geologi Lembar Baucau, Timor Timur, skala 1 : 250.000. Puslitbang Geologi, bandung.
Powel, D.E., 1976. The geological evolution of continental margin of Northwest Australia. J. Aust. Petrol. Expl. Ass. 10 : 13-23.
Rosidi, H.M., Suwitodirdjo, K. & Tjokrosapoetro, S., 1981. Peta Geologi Lembar Kupang – Atambua, Timor, skala 1 : 250.000. Puslitbang Geologi, Bandung.
Van der Sluis, J.P.,1950. Geology of Seram. University of Utrecht.
Sudiyono, 1993. Analisis mikropaleontologi percontoh batuan dari daerah Lembar Peta Dili, Timor Timur. Puslitbang Geologi, Laporan tidak terbit.
Sudijono, 1995. Analisis mikropaleontologi percontoh batuan Lembar Peta Baucau, Timor Timur. Puslitbang Geologi, laporan tidak terbit.
Veevers, J.J., 1982. Western and northwestern margins of Australia, in : Ocean Basins and Margins, vol.6: Indian Ocean, edited by Nairn, A.E.M. & Stehli, F., 513-544.
Downloads
Published
Issue
Section
License
Authors who publish articles in Jurnal Geologi dan Sumberdaya Mineral (JGSM.Geologi) agree to the following terms:
- Authors retain copyright of the article and grant the journal right of first publication with the work simultaneously licensed under a CC-BY-NC or The Creative Commons Attribution–ShareAlike License.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgment of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access)
