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Magnetic properties of sediments from Ocean Drilling Program sites 1109, 1115, and 1118 (Leg 180), Woodlark Basin (Papua New Guinea)
Earth, Planets and Space volume 54, pages883–897(2002)
Latest Miocene-Pleistocene synrift sediments at Ocean Drilling Program sites 1109, 1115, and 1118 (Leg 180), located on the hanging wall margin north of the Moresby fault in the Woodlark Basin, showed variations in magnetic parameters carried by magnetite and maghemite related to sedimentation process in the basin. At sites 1109 and 1115, an increase in the sedimentation rate at 3.8 Ma was accompanied by the deposition of sediments with low ferrimagnetic mineral concentrations. An increase in the ferrimagnetic mineral concentrations occurred between 3.4 Ma and 3.2 Ma at the three sites. The onset age of the change became younger with distance from the subsidence center of the basin near the Moresby fault: 3.4 Ma at Site 1118, 3.3 Ma at Site 1109, and 3.2 Ma at Site 1115, which implies a northward onlapping of sediments with high ferrimagnetic mineral concentration. Sediments with finer-grained ferrimagnetic minerals were deposited between 2.3 and 2.0 Ma at sites 1118 and 1109 and later, 2.8 Ma at Site 1115 during a period of a low sedimentation rate. The upper parts of sites 1109 and 1115 had a diamagnetic contribution, which is attributed to relatively high concentrations of diamagnetic pelagic materials at a low sedimentation rate associated with the low frequency of turbidites.
Berggren, W. A., D. V. Kent, C. C. Swisher, III, and M. P. Aubry, A revised Cenozoic geochronology and chronostratigraphy, in Geochronology Time Scales and Global Stratigraphic Correlation, SEPM Spec. Publ, edited by W. A. Berggren, D. V. Kent, M. P. Aubry, and J. Hardenbol, pp. 129–212, 1995.
Berner, R. A., Sedimentary pyrite formation: An update, Geochim. Cosmochim. Acta., 48, 605–615, 1984.
Day, R., M. Fuller, and V. A. Schmidt, Hysteresis properties of titanomagnetites: grain-size and compositional dependence, Phys. Earth Planet. Inter, 13, 260–267, 1977.
De Boer, C. D. and M. J. Dekkers, Grain-size dependence of the rock magnetic properties for a natural maghemite, Geophys. Res. Lett., 23, 2815–2818, 1996.
Lackschewitz, K. S., P. V. D. Bogaard, and D. F. Mertz, 40Ar/39 Ar ages of fallout tephra layers and volcaniclastic deposits in the sedimentary succession of the western Woodlark Basin, Papua New Guinea: The marine record of Miocene-Pleistocene volcanism, in Non-volcanic Rifting of Continental Mragins: Evidence from Land and Sea, Geol. Soc. Spec. Publ, 187, edited by R. C. L. Wilson et al, 373–388, 2001.
Lowrie, W., Identification of ferromagnetic minerals in a rock by coercivity and unblocking temperature properties, Geophys. Res. Lett., 17, 159–162, 1990.
King, J. W. and J. E. T. Channell, Sedimentary magnetism, environmental magnetism, and magnetostratigraphy, U.S. Natl. Rep. Int. Union Geod. Geophys. 1987–1990, Rev. Geopys., 29, 358–370, 1991.
Parry, L. G., Shape-related factors in the magnetization of immobilized magnetite particles, Phys. Earth Planet. Inter, 22, 144–154, 1980.
Parry, L. G., Magnetization of immobilized particle dispersions with two distinct particle sizes, Phys. Earth Planet. Inter, 28, 230–241, 1982.
Roberts, A. P., Y. Cui, and K. L. Verosub, Wasp-waisted hysteresis loops: Mineral magnetic characteristics and discrimination of components in mixed magnetic systems, J. Geophys. Res., 100, 17909–17924, 1995.
Takahashi, K., G. Cortese, G. M. Frost, S. Gerbaudo, A. M. Goodliffe, N. Ishikawa, K. S. Lackschewitz, R. C. B. Perembo, J. M. Resig, W. G. Siesser, B. Taylor, and M. Testa, Summary of revised age assignments for ODP Leg 180, in Proc. ODP, Sci. Results, 180, edited by P. Huchon, B. Taylor, A. Klaus et al., 2001.
Tauxe, L., T. A. T. Mullender, and T. Pick, Potbellies, wesp-waists, and superparamagnetism in magnetic hysteresis, J. Geophys. Res., 101, 571–583, 1996.
Taylor, B. and N. F. Exon, An investigation of ridge subduction in the Woodlark-Solomons region: Introduction and overview, in Marine Geology, Geophysics and Geochemistry of the Woodlark Basin-Solomon Islands, Earth Sci. Ser., 7, edited by B. Taylor and N. F. Exon, pp. 1–24, Circum-Pacific Council For Energy and Mineral Resources, Houston, Tex, 1987.
Taylor, B., A. Klaus, A. Goodliffe, F. Martinez, and R. Hey, Continental rifting and initiation of sea-floor spreading in the Woodlark Basin, Nature, 374, 534–537, 1995.
Taylor, B., A. Klaus, A. Goodliffe, and F. Martinez, How continents break up: Insights from Papuan New Guinea, J. Geophys. Res., 104, 7497–7512, 1999a.
Taylor, B., P. Huchon, A. Klaus, et al., Proc. ODP, Init. Repts., 180, Active Continental Extension in the Western Woodlark Basin, Papua New Guinea [CD-ROM], Available from: Ocean Drilling Program, Texas A&M University, College Station, TX 77845-9547, U.S.A., 1999b.
Thompson, R. and F. Oldfield, Environmental Magnetism, Allen and Unwin, Winchester, Mass., 277 pp., 1986.
Van Velzen, A. J. and J. D. Zijderveld, Effects of weathering on singledomain magnetite in Early Pliocene marine marls, Geophys. J. Int., 121, 267–278, 1995.
Verosub, K. L. and A. P. Roberts, Environmental magnetism: Past, present, and future, J. Geophys. Res., 100, 2175–2192, 1995.
Weissel, J. K., B. Taylor, and G. D. Kaener, The opening of the Woodlark Basin, subduction of the Woodlark spreading system and evolution of northern Melanesia since mid-Pliocene time, Tectonophys., 87, 253–277, 1982.
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Ishikawa, N., Frost, G.M. Magnetic properties of sediments from Ocean Drilling Program sites 1109, 1115, and 1118 (Leg 180), Woodlark Basin (Papua New Guinea). Earth Planet Sp 54, 883–897 (2002). https://doi.org/10.1186/BF03352436
- Magnetic Mineral
- Ocean Drill Program
- Isothermal Remanent Magnetization