Akibat Ketidakstabilan Lereng Cekungan Dasar Laut pada Batuan Sedimen Neogen di Desa Kananggar, Kabupaten Sumba Timur, Nusatenggara Timur

Prijantono Astjario

doi:10.33332/jgsm.geologi.v16i4.368

Authors

Prijantono Astjario

DOI:

https://doi.org/10.33332/jgsm.geologi.v16i4.368

Abstract

Indonesia has thousands of islands in various tectonic settings and, in consequence, it has an immense variety of submarine slopes. Due to the ongoing orogenic processes, Cenozoic basins have emerged, and their evolution can be studied in more detail. Giant slide masses entirely made up of an incoherent association of broken, folded, and crumpled strata occuring along the transect to Kananggar. The best exposed example is located ENE of Kananggar. It follows on top and laterally from a succession of about 100 meter of very thick-bedded, stacked debris, flow-turbidite channels. The slide could be observed 2 in an area of some 10 km . The observed thickness is in order of 120 m and the mass is directly overlain by a normal stratified pelite-turbidite succession.

Â

Keywords: slope, basin, sea floor, slide, Kananggar

Downloads

Download data is not yet available.

References

Coleman, J.M., dan Prior, D.B., 1988, Mass wasting on continental margins. Ann. Rev. Earth Planet. Sci., 16 : 101 - 119.

Effendi, A.C,. dan Apandi, C., 1981. Geological Map of Sumba Quadrangle, Nusa Tenggara, Skala 1 : 250.000 Geol. Res. Dev. Centre, Bandung.

Fortuin, A.R., Roep, Th.B., Sumosusastro, PA. dan Van Weering, TjCE. 1991 Out line of Neogene forarc sedimentation in eastern Sumba, Indonesia. Proc. Silver Jubilee Symp. On the Dynamics of Subduction and its Products. Res. and Devel. Center-LIPI, Bandung, p.329 - 333.

Hamilton, W., 1979. Tectonics of the Indonesian region, U.S. Geol. Surv. Prof. Paper 1078, 345p.

Karig, D.E., Barber, A.J., Charlton, T.R., Klemperer, S., dan Hussong, D M., 1987. Nature and distribution of deformation across the Banda Arc-Autralian collision zone at Timor. Geol. Soc. Am. Bull., 98: 18 - 32.

Katili, J.A., 1989. Review of past and present geotectonic concepts of eastern Indonesia. Proc. Snellius-II Symposium, Theme I : Geology and geophysics of the Banda Arc and adjacent areas, pt. 1 Neth. J. Sea Res., 24 : 103 - 29.

Masson, D.G., Milsom, J., Barber, A.J., Sikumbang, N., dan Dwiyanto, B., 1991. Recent tectonics araound the island of Timor, eastern Indonesia. Mar. and Petr. Geol., 8: 35 - 49.

Meisner, P., and Pfeiffer, K., 1965, Hydrological Map of the Island of Sumba, scale 1 : 500.000. Indonesia Geol. Surv. , Bandung.

Nitzsche, M. 1989, Submarine slope instability, east Banda Sea. Neth. J. Sea Res., 24: 431 - 436.

Van Bemmelen, R.W, 1949. The Geology of Indonesia, Government Printing Office, The Hague, IA, 732p.

Van der Werff, W., dan Van Weering, Tj.C.E., 1991, The Dynamics of Subduction and its Products, Proc. Silver Jubilee Symp. Jogjakarta, LIPI, p.235 - 235.

Van Weering, Tj C E., Kridoharto, P., Kusnida, D., Lubis, S., Tjokrosapoetro, S., dan Munadi, S., 1989. Slumping, Sliding and the occurrence of acoustic voids in recent and subrecent sediments of the Savu forearc Basin (Indonesia). Neth. J. Sea Res., 24 : 415 - 430.

Van der Borch, C.G., Grady, A.E., Hadjoprawiro, S., Prasetyo, H., and Hadiwisastra, S., 1983, Mesozoic and late Tertiary submarine fan sequences and their tectonic significance, Sumba, Indonesia, Sediment. Geol., 37 : 113 -137.

Wensink, H., 1991. The paleoposition of the island of Sumba, derived from paleomagnetic data. Proc. Silver Jubilee Symp. On the Dynamics of Subduction and its Products. Res. And Devel. Centre-LIPI, Bandung, 238 - 242.

Witkamp, H. 1912 1913, Een verkenningstocht over het eiland Sumba. Tijdschr. Kon. Ned. Aardrijksk. Gen., Part I, 29 : 744 - 755; Part II, 30 : 8 - 27.