Model Kerak Daerah Busur Muka di Pulau Siberut dan Perairan di Sekitarnya Berdasarkan Analisis Anomali Gayaberat
DOI:
https://doi.org/10.33332/jgsm.geologi.v16i2.41Abstract
Tersedianya informasi gayaberat, kegempaan, ketebalan sedimen dan kedalaman air laut di daerah Pulau Siberut dan perairan sekitarnya memberi peluang untuk dilakukan pemodelan struktur kerak. Hasil penafsiran data gayaberat daerah Pulau Siberut menunjukkan bahwa nilai anomali daerah ini dapat dikelompokkan menjadi tiga bagian, yaitu kelompok dengan nilai rendah, tinggi dan sedang, yang masing-masing menggambarkan daerah palung laut, daerah akresi dan daerah busur vulkanik. Model gayaberat berbasis perhitungan dengan pemilihan nilai rapatmassa dan geologi bawah permukaan menunjukkan bahwa daerah akrasi dan palung laut sebelah barat dialasi oleh kerak samudera dan kerak akresi (kerak bancuh) sedangkan daerah palung laut sebelah timur dan busur vulkanik dialasi oleh batuan alas kerak peralihan atau kerak andesitik.
Kata Kunci - Anomali Gayaberat, pemodelan, struktur geologi bawah permukaan, kerak, Pulau Siberut
Downloads
References
Adinugroho, N., 2008. Geologi Regional Cekungan Sumatera Tengah, http//nooradinugroho. wordpress.com/2008/10/15/geologi-regionalcekungan-sumatera...1/29/2009:1-17.
Barber, A.J., Crow, M.J. and Milson, J.S., 2005. Sumatra : Geology, Tectonics, Resources and Tectonics Evolution. Geological Society Memoir no 31.
Buyung, N., Subagio dan Walker, A.S.D.,1992. Peta Anomali Bouguer Lembar Padang. Sumatera, skala 1 : 250.000, Pusat Penelitian dan Pengembangan Geologi, Bandung
----------, 1994. Hasil penyelidikan gayaberat regional di Sumatera Wilayah Selatan. Kumpulan Makalah, Seminar Hasil Penyelidikan Geologi dan Sumber Daya Mineral Sumatera Bagian Selatan, Direktorat Sumber Daya Mineral-Pusat Penelitian dan Pengembangan Geologi, Bandung 23 Maret 1994:37-60.
Davies, P.R., 1984. Tertiary structural evolution and related hydrocarbon occurences, North Sumatra Basin.Indon. Petrol. Assoc. Procc., 13:19-49.
Dickinson, W.R., 1970, Relations of andesites, granites and derivative sandstones to src-trench tectonics, Rev. Geophys. Space Phys. Vol. 8 no. 4:813-860.
Hamilton, W., 1974. Sedimentary Basins of the Indonesian Region. United States Geological Survey Map 1-875B, Dept. Of Interior, USA.
Hartanto, P., Sastramihardja, T, Soebowo, E dan Djuwansah, M., 1996. Aspek geologi bagi penataan ruang Pulau Siberut, Prosiding PIT IAGI ke 25, Bandung:411-419
Katili, J.A., 1980.Geotectonics of Indonesia, a Modern View, with comment by Tjia H.D. Directorate General of Mine, Jakarta, 271p.
Karig, D.E., Suparka, S., Moore, G.F. and Hehanussa, P.E., 1979. Structure and Cenozoic evolution of the Sunda Arc in the Central Sumatra region, In : Watkins, Montadert, L and Dickerson, P.W. (Eds.), Geological and Geophysical Investigation of Continental Margins, AAPG Memoir 29:223-237.
Kiekhefer, R.M., Moore, G.F., Emmel, F.J. and Sugiarta, W.,1981. Crustal Structure of the Sunda forearc region, West of Central Sumatra from gravity data. Jour. Of Geophys. Res. V.86, no. B8:7003-7012.
Leo, G.W., Hedge, C.E. dan Marvin, R.F., 1980. Geochemistry, strontium isotope data and potassium ages of the andesite-rhyolite association in the Padang area, West Sumatra. Jour. Volcanology and Geothermal Res., vol. 7:139-156.
Mangga, S.A., Burhan, G. Sukardi dan Suryanila, E., 1994. Peta Geologi Lembar Siberut, Sumatera, skala 1 : 250.000. Pusat Penelitian dan Pengembangan Geologi Bandung.
Metcalfe, I., 1998. Paleozoic and Mesozoic geological evolution of the SE Asian region : multidisciplinary constrains and implications for biogeografi. Biogeography and Geological evolution of SE Asia, pp 25-4, eds. Robert Hall dan Jeremy D. Holloway, Backbuys Publishers, Leiden.
Moore, G.F. and Karig, D.E., 1980. Structural geology of Nias Island, Indonesia : Implications for subduction zone tectonics. Am. J. Sci., 280:193-223
NOAA, 2014, Natural Hazards Viewer, National Geophysical Data Center, http://maps.ngdc.noaa.gov/viewers/hazards/?tsEvent=2439
Padmawidjaja, T dan Nainggolan, D.A., 2006. Peta Anomali Bouguer Lembar Siberut, Sumatera, skala 1 : 250.000. Pusat Survei Geologi, Bandung
Pulunggono, A and Cameron, N.R., 1984. Sumatran microplates and their caracteristics and their role in the evolution of Central and South Sumatra Basins. Indon.Petrol.Assoc. Procc. 13: 121-144.
Rosidi, H.M.D. Tjokrosapoetro, S. dan Pendowo, B., 1976. Peta Geologi Lembar Painan dan Bagian Timurlaut Lembar Muarasiberut, Sumatera, skala 1 : 250.000. Direktorat Geologi, Bandung
Suparka, S., 1984. Posisi tektonik batuan kegunungapian Musala, Sibolga, Sumatera Utara. RISET, Geologi dan Pertambangan, LGPN- LIPI, no. 2, Jilid 5:37-50.
South East Asia Gravity Project (SEAGP), 1992. Gravity Anomaly Map Sheet 3.Geophysical Exploration Technology Ltd. Univ. Of Leeds, Leeds LS29JT, United Kingdom
Subagio dan Widijono, B.S., 2001. Model gayaberat, struktur kerak dan implikasinya terhadap kestabilan lahan di Pulau Nias. Jurnal Geologi dan Sumber Daya Mineral, no. 120, v. XI, Pusat Survei Geologi, Bandung:2-13.
Telford, W.M., Geldart, L.P., Sherrif, R.E. and Keys, D.A., 1976. Applied Geophysics, Cambridge University Press, London, 860p.
Vigny, C., 2009. The Earthquake of Padang, Sumatra of 30 September 2009-scientific information and update.http://www.tectonics.caltech.edu/sumatra/details/faultA.htm
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)
