Penelitian Magnetostratigrafi dan Penerapan Satuan Stratigrafi Polaritas Magnet sebagai Satuan Kronostratigrafi: Studi Kasus di Cekungan Bandung serta Daerah Mojokerto dan Sangiran, Jawa
DOI:
https://doi.org/10.17014/ijog.5.2.137-150Keywords:
paleomagnetism, magnetic polarity chronostratigraphy, isochron, stratigraphic correlationAbstract
Palaeomagnetism has a role to make a new stratigraphic nomenclature based on the earth magnetism of a nonperiodic reversal polarity phenomenon. Since this phenomenon has a global impact, it can be used as a potential correlation, known as the Magnetic Polarity Chronostratigraphy Unit. Remanent magnetism direction having reversal polarity against present earth magnetic field has long been known since early palaeomagnetic studies. Modern development of geomagnetic polarity time scale (GPTS), initiated in early 1960’s has followed the advancement of radiometric dating which is more accurate. A palaeomagnetic record obtained in the past of 3 Ma of rock in the Sangiran Area, East Java, has contributed in making a correction of previous magnetostratigraphy researches as well as a new level stratigraphy boundary and a new event of geomagnetic polarity. Based on the correlation record of secular variation in Mojokerto and Sangiran, the magnetostratigraphy of formations of Pleistocene age at Mojokerto has been arranged. The geomagnetic polarity stratigraphy of the past 4 Ma of the rocks in the Bandung Basin and its surrounding areas can be used as a guidance of isochronous position in the stratigraphy correlation.
References
Alzwar, M., Akbar, N. dan Bachri, S. 1992. Geological Map of the Garut and Pameungpeuk Quadrangle, Java. Geological Research and Development Centre, Bandung, Indonesia.
Blackett, P.M.S., 1956. Lectures on Rock Magnetism. Weizmann Science Press of Israel, Jerusalem, 131 h.
Bonhommet, N. dan Babkine, J., 1969. Paleomagnetism and potassium-argon age determination of the Laschamp geomagnetic polarity event. Earth and Planetary Science Letters, 6, h. 43. DOI:10.1016/0012-821X(69)90159-9
Brunhes, B., 1906. Dalam: Opdyke, N.D., dan Channell, J.E.T. 1996. Magnetic Stratigraphy. Academic press, 343 h.
Butler, R.F., 1992. Paleomagnetism: Magnetic Domains to Geologic Terranes. Blackwell Science Inc., 237 h. DOI:10.5860/CHOICE.29-5708
Cande, S. C. dan Kent, D.V., 1992. A new geomagnetic polarity timescale for the Late Cretaceous and Cenozoic. Journal of Geophysical Research, 97, h.13.917-13.951. DOI:10.1029/92JB01202
Cande, S. C. dan Kent, D.V., 1995. Revised calibration of the geomagnetic polarity timescale for the Late Cretaceous and Cenozoic. Journal of Geophysical Research, 100. No.B4, h.6093-6095. DOI:10.1029/94JB03098
Chauvin, A., Duncan, R. A., Bonhommet, N., dan Levi, S., 1989. Paleointensity of the Earth’s magnetic field and K-Ar dating of the Louchardière volcanic flow, central France: New evidence for the Laschamp excursion. Geophysical Research Letters, 16, h. 1189. DOI:10.1029/GL016i010p01189
Creer, K. M., Irving, E., dan Runcorn, S. K., 1954. The direction of the geomagnetic field in remote epochs in Great Britain. Philosophical Transactions of the Royal Society London Serie A, 250, h. 144–156. DOI:10.5636/jgg.6.163
Dam, M. A. C. dan Suparan, P., 1992. The Geology of Bandung Basin, West Java, Indonesia. Geological Research and Development Centre Special Publication, 13, 79 h.
Einarsson, Tr. dan Sigurgeirsson. T., 1955. Rock magnetism in Iceland. Nature, 175, h. 892. DOI:10.1038/175892a0
Gradstein, F.M. dan Ogg, J.G., 2004. Geologic Time Scale 2004 – why, how, and where next! Lethaia, 37, h. 175-181. Oslo.
Hospers, J., 1951. Remanent magnetism of rocks and the history of the geomagnetic field, Nature, 168, h.1111-1112. DOI:10.1038/1681111a0
Hutchinson, C. S., 1982. Indonesia. Dalam: Thorpe, R.S. ed., "Andesite", John Willey & Sons. Chichester, h.207-224.
Hyodo, M., Sunata, W., and Susanto, E. E., 1992, A Long-Term Geomagnetic Excursion from Plio-Pleistocene Sediments in Java. Journal of Geophysical Research., 97(B6), h.9323–9335. DOI:10.1029/91JB03067
Hyodo, M., Watanabe, N., Sunata, W., Susanto, E.E., dan Wahyono H., 1993, Magnetostratigraphy of Hominid Fossil Bearing Formations in Sangiran and Mojokerto, Java. Anthropological Science, 101(2), h.157-186. DOI:10.1537/ase.101.157
Kirschvink, J. L., 1980. The least-squares line and plane and the analysis of paleomagnetic data. Geophysical Journal of the Royal Astronomical Society, 62, h.699-718. DOI:10.1111/j.1365-246X.1980.tb02601.x
Levi, S., Audonsson, H., Duncan, R. A., Kristjansson, L., Gillot, P.-Y., dan Jakobsson, L., 1990. Late Pleistocene geomagnetic excursion in Icelandic lavas: confirmation of the Laschamp excursion. Earth and Planetary Science Letters, 96, h.443. DOI:10.1016/0012-821X(90)90019-T
Mankinen, E.A. dan Dalrymple, G.B., 1979. Revised geomagnetic polarity time scale for the interval 0-5 m.y. B.P. Journal of Geophysical Research, 84, h.615-626. DOI:10.1029/JB084iB02p00615
Martodjojo, S. dan Djuhaeni, 1996. Sandi Stratigrafi Indonesia. Komisi Sandi Stratigrafi Indonesia IAGI, Jakarta, 25h.
Matsuyama, M., 1929. On the direction of magnetization of basalt in Japan, Tyozen and Manchuria. Proceedings of the Imperial Academy of Japan, 5, h.203-205.
Ngkoimani, LO. Bijaksana, S., dan Abdullah, C.I., 2006. Paleo-Magnetic and Geo-chronological Constraints on the Cretaceous Miocene Tectonic Evolution of Java, International Geoscience Conference Proceedings, Jakarta 06-SOT-11, 4 h.
Opdyke N. D. dan Runcorn S. K., 1956. New Evidence for Reversal of the Geomagnetic Field near the Pliocene-Pleistocene Boundary. Science, 123(3208), h.1126.
Salvador, A., (eds.), 1994, International Stratigraphic Guide: A Guide to Stratigraphic Classification, Terminology, and Procedure. International Union of Geological Sciences and Geological Society of America, 214 h.
Sendjaja, Y.A. Kimura, J,-I, dan Sunardi, E., 2009. Acrossarc geochemical variation of Quaternary Lavas in West Java, Indonesia: Mass balance elucidation using Arc Basalt Simulator model. Island Arc, 18, h.201-224. DOI:10.1111/j.1440-1738.2008.00641.x
Sendjaja, Y.A., 2009. Geochemistry of Late Cenozoic lavas in West Java, Indonesia: Origin of Arc Magmatism and its implication to tectonic development. Dr.Sc. Thesis, Graduate School of Science and Engineering, Shimane University, Japan.
Sunardi, E., 1997. Magnetic Polarity Stratigraphy of the Plio-Pleistocene volcanic rocks around the Bandung Basin, West Java, Indonesia. Dr.Sc. Thesis, Osaka City University. Japan. DOI:10.1016/S1342-937X(05)70576-1
Sunardi, E. dan Kimura, J., 1997. Temporal chemical variations of the late Neogene volcanic rocks around the Bandung Basin, West Java, Indonesia: An inferred timetable resolving the evolutionary history of the upper mantle. Journal of Mineralogy Petrology and Economic Geology, 93, h.103-128. DOI:10.2465/ganko.93.103
Van Bemmelen, R.W., 1949. The Geology of Indonesia. Government Printing Office, Den Haag, Vol I, IA and IB, 732 h.
Vine F.D. dan Matthews, D.H., 1963. Magnetic anomalies over oceanic ridges. Nature, 199, h.947–949. DOI:10.1038/199947a0
Walker, J.D. dan Geissman, J.W., (compilers,), 2009. Geologic Time Scale: Geological Society of America, doi:10.1130/2009.CTS004R2C. Geological Society of America.
Whitford, D. J., Nicholls, I. A., dan Taylor, S. R., 1979. Spatial variations in the geochemistry of Quaternary lavas across the Sunda arc in Java and Bali. Contribution to Mineralogy Petrology, 70, h.341-356. DOI:10.1007/BF00375361
Zijderveld, J. D. A., 1967. A demagnetization of rocks: Analysis of results. Dalam: Collinson, D.W., Creer, K.M., dan Runcorn S. K., (eds.), Methods in Paleomagnetism, Elsevier, Amsterdam, h.254-286.
