PENAFSIRAN STRUKTUR BAWAH PERMUKAAN DAERAH BANGKA UTARA, BERDASARKAN ANOMALI GAYA BERAT
DOI:
https://doi.org/10.33332/jgsm.geologi.v17i3.287Abstract
The gravity measurement carried out in the North Bangka Quadrangle has produced 1:250,000 Bouguer anomaly, regional and residual gravity maps. Bouguer anomaly values range from 5.0 to 39.0 mgal, regional anomalies arebetween 13.0 until 35.0 mgal and residual anomalies are from -7.0 to 10.0 mgal. The Bouguer anomalies aredivided into three types, i.e : low, medium and high, while the residual anomaly is categorized as positive and negativeareas.The modelling result of three sections of residual anomaly shows that the density of 2.69 gr/cc and interpreted asPemali Complex belongs to the basement in the area. This basement is Pemali Complex which is intruded by rocks with densities of 2.54 ; 2.56 and 2.58 gr/cc and indicated as granitic intrusion. Boundary between Pemali complex, Tanjunggenting formation and granitic intrusion is fault contact. This contact could be potential for secondary tin deposit resulted from weathered granite.
Â
Keywords : gravity, residual anomaly, density, tin deposit, BangkaDownloads
References
Adkins, J., S. Sukardi, H. dan M. Untung, 1978. A Regional Gravity Base Station Network for Indonesia, Pub. Tek., Seri Geofisika6, Direktorat Geologi.
Chappel, B.W., White A.J.R., 1974. Two Contrasting Granite Types. Pacific Geology 8: 173-174 th Clark, D. & Glendinning J., 1954. Plane and geodetic surveying for engineers, vol 2 Higher surveying, 4 edition, Constable & Co., London : 446-460.
Djumhana, D., 1995. Beberapa Aspek Petrologi Batuan Granitik di Daerah Bagian Barat P. Bangka, Kolokium Hasil Pemetaan dan Penelitian Puslitbang Geologi 1992/1993, Publikasi Khusus 16: 101-117, Pusat Penelitian dan Pengembangan Geologi, Bandung.
Gafoer, S., Amin, T.C., Setyogroho, B., 1992. Peta Geologi Indonesia, Lembar Palembang, skala 1 : 1000.000, Pusat Penelitian dan Pengembangan Geologi (PPPG) Bandung.
Hutchison, R.W., 1980. Massive base metal sulphide deposits as guides to tectonic evolution. In: Strangeway D.W (ed.), The continental crust and its mineral deposits. Geological Association of Canada, Special Peper 20: 659-684.
Ishihara, S., 1980. Granite and Sn-W deposits of Peninsular Thailand, Mining Geology Spesial Issue 8: 223- 241.
Katili, J.A., 1973. Geochronology of west Indonesia and its implication to plate tectonics, Tectonophysycs 14: 195-212.
Lehman, B., 1990. Metallogeny of tin lecture Notes in Earth Sciences, 32. Springer-Verlag, Berlin.
Mangga, S. A. dan Djamal, B., 1994. Peta Geologi Bangka Utara, Sumatera, skala 1:250.000, Pusat Penelitian dan Pengembangan Geologi (PPPG) Bandung.
Manurung, A., Suharyono, S., Marzuki, S. dan Walker, A., 1990. Peta Anomali Bouguer Lembar Bangka Utara, Sumatera, skala 1 :250.000, Pusat Penelitian dan Pengembangan Geologi (PPPG) Bandung.
Nasution, J., 2000. Anomali Gaya berat dan Aspek-aspek Geologi serta Prospek Mineralisasi di Daerah Pemetaan Gaya berat Lembar Garut Jawa Barat, Pusat penelitian dan Pengembangan Geologi (PPPG) Bandung. Seri Geofisika 1:7-20
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)
