Seismic Facies of Pleistocene–Holocene Channel-fill Deposits in Bawean Island and Adjacent Waters, Southeast Java Sea

Ali Albab, Noor Cahyo Dwi Aryanto

Abstract


The late Pleistocene-Holocene stratigraphic architecture of the Bawean Island and surrounding waters, southeast Java Sea has been analyzed by using sparker seismic profiles. Geological interpretation of these seismic profiles revealed the widespread distribution of paleochannels with different shape and size in the present-day Java Sea. Two channel types can be distinguished based on its morphology: U-shaped channels in the western part and V-shaped channels in the eastern part. The stratigraphic successions were grouped into two major seismic units separated by different seismic boundaries. Characters of marine and fluvial deposits were determined based on seismic boundaries and internal reflectors. Three seismic facies can be identified within late Pleistocene – Holocene incised channel fills associated with SB2. The internal structure of incised-channels consist of chaotic reflector at the bottom, covered by parallel–sub parallel and almost reflection-free indicating the homogenous sediment deposited during the succession.

Keywords : Pleistocene-Holocene channel fills, sparker seismic profiles, seismic boundaries, incised–channel, Java Sea.

 

Rekaman seismik sparker digunakan untuk menganalisis endapan stratigrafi berumur Plistosen Akhir–Holosen di Perairan Pulau Bawean dan sekitarnya. Berdasarkan interpretasi geologi dari rekaman seismik tersebut teridentifikasi sebaran alur purba yang berbeda bentuk dan ukuran dengan kondisi Laut Jawa sekarang. Berdasarkan morfologinya, dua tipe alur purba yang terdentifikasi adalah alur purba berbentuk U di bagian barat dan berbentuk V yang terbentuk di bagian timur daerah penelitian. Suksesi stratigrafi kemudian dibedakan menjadi dua grup unit seismik utama yang dibatasi oleh perbedaan batas seismik, yaitu endapan asal darat dan laut yang ditentukan berdasarkan batas sikuen dan reflektor internal. Pada unit Pleistosen–Holosen teridentifikasi tiga tipe fasies seismik yang berkorelasi pada batas sikuen SB2. Struktur internal alur purba yang tertoreh terdiri dari reflektor kaotik yang di bagian bawah, kemudian ditutupi oleh reflektor paralel - sub paralel sampai hampir bebas refleksi yang mengindikasikan terendapkannya sedimen homogen selama suksesi tersebut.


Kata kunci : Pengisi alur Plistosen - Holosen, penampang seismik sparker, batas seismik, alur tertoreh, Laut Jawa.


Keywords


Pleistocene-Holocene channel fills;sparker seismic profiles;seismic boundaries;incised–channel;Java Sea

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References


Aziz, S., Hardjoprawiro, S., and Mangga, S.A., 1993. Peta Geologi Lembar Bawean dan Masalembo, Jawa. Pusat Penelitian dan Pengembangan Geologi. Bandung.

Catuneanu, O., Galloway, W. E., Kendall, C.G. S.C., Miall, A.D., Posamentier, H.W., Strasser, A., and Tucker, M.E.,2011. Sequence Stratigraphy: Methodology and nomenclature. Newsletters on Stratigraphy, 44 (3): 173–245. https://doi.org/10.1127/0078-0421/2011/0011

Darmadi, Y., Willis, B.J., and Dorobek, S.L., 2007. Three-Dimensional seismic architecture of fluvial sequences on the low-gradient Sunda Shelf, Offshore Indonesia. Journal of Sedimentary Research, 77 (3): 225–238. https://doi.org/10.2110/jsr.2007.024

Hanebuth, T.J.J., Stattegger, K., and Bojanowski, A., 2009. Termination of the Last Glacial Maximum sea-level lowstand: The Sunda-Shelf data revisited. Global and Planetary Change, 66 (1–2): 76–84. https://doi.org/10.1016/j.gloplacha.2008.03.011

Hanebuth, T.J.J., Stattegger, K., and Grootes, P.M., 2000. Rapid flooding of the Sunda shelf: a late glacial sea level record. Science, 288 (May): 1033–1035. https://doi.org/10.1126/science.288.5468.1033

Indriastomo, D., Sukmana, N., Widodo, J., Aryanto, N.C.D., Ilahude, D., and Salahuddin, M., 1995. Laporan Kompilasi Data Geologi dan Geofisika Perairan Pulau Bawean, Laut Jawa Bagian Timur. Bandung. Unpublished.

Kuenen, P.H., 1950. Marine Geology, John Wiley and Sons, Inc., New York Chapman & Wall, Limited, London. 601p.

Raharjo, P., and Arifin, L., 2007. Identifikasi Alur Purba Berdasarkan Seismik Pantul Dangkal di Perairan Bangka Utara Lembar Peta 1114. Jurnal Geologi Kelautan, 5 (2): 165–176.

Reijenstein, H.M., Posamentier, H.W., and Bhattacharya, J.P., 2011. Seismic geomorphology and high-resolution seismic stratigraphy of inner-shelf fluvial, estuarine, deltaic, and marine sequences, Gulf of Thailand. AAPG Bulletin, 95 (11): 1959–1990. https://doi.org/10.1306/03151110134

Sathiamurthy, E., and Voris, H.K., 2006. Maps of Holocene sea level transgression and submerged lakes on the Sunda Shelf. The Natural History Journal of Chulalongkorn University, 2, 44p.

Setyawan, W.B., and Nuryana, S.D., 2016. Geologi. Rekaman posisi muka laut pada akhir masa deglasial di Perairan Kepulauan Matasiri, Laut Jawa. Oseanologi dan Limnologi di Indonesia, 1: 67–74.

Sidarto, Santosa, S., and Hermanto, B., 1993. Peta Geologi Lembar Karimunjawa, Jawa. Pusat Penelitian dan Pengembangan Geologi. Bandung.

Solihuddin, T., 2014. A drowning Sunda Shelf Model during Last Glacial Maximum (LGM) and Holocene: A Review. Indonesian Journal on Geoscience, 1(2): 99–107.

Susilohadi, S., and Soeprapto, T.A., 2015. Plio-Pleistocene seismic stratigraphy of the Java Sea between Bawean Island and East Java. Berita Sedimentologi, 32: 5–16.

Tjallingii, R., Stattegger, K., Wetzel, A., and Phach, P. Van., 2010. Infilling and flooding of the Mekong River incised valley during deglacial sea-level rise. Quaternary Science Reviews, 29(11–12): 1432–1444. https://doi.org/10.1016/j.quascirev.2010.02.022

Tjia, H.D., 1992. Holocene sea-level changes in the Malay-Thai Peninsula , a tectonically stable environment. Geological Society Malaysia Bulletin, 31(7): 157–176.

van Bemmelen, R., 1949. The Geology of Indonesia: Vol 1. The Hague: Martinus Nijhoff. 766p.

Veeken, P., 2007. Seismic Stratigraphic techniques. In: Handbook of Geophysical Exploration: Seismic Exploration (p. 111–234).

Voris, H.K., 2000. Maps of Pleistocene sea levels in SoutheastAsia: Shorelines, river systems and time durations. Journal of Biogeography, 27(5): 1153–1167.

Weschenfelder, J., Corrêa, I.C.S., Aliotta, S., and Baitelli, R., 2010. Paleochannels related to late quaternary sea-level changes in southern Brazil. Brazilian Journal of Oceanography, 58(SPEC. ISSUE 2): 35–44. https://doi.org/10.1590/S1679-87592010000600005

Zaitlin, B.A., Dalrymple, R.W., and Boyd, R., 1994. The stratigraphic organization of incised-valley systems associated with relative sea-level change. Incised-valley systems: Origin and sedimentary sequences, SEPM Special Publication, 51: 45 - 60.