Magnetic Properties of Ancient Sediments Bengawan Solo, Central Java-East Java, Indonesia

Information about the eruption of Mount Lawu in Central Java Province 1885 and Merapi D.I. Yogyakarta 2010 became a source for estimating presence magnetic minerals which underwent sedimentation process Bengawan Solo River from upstream (Wonogiri) - downstream (Bojonegoro). The results we get susceptibility distribution sediments reveal that sediment upper reaches has low frequency value around 1,080.23×10−8 m3/Kg 2,780.77×10−8 m3/Kg, middle part is 74.40×10−8 1,735.90×10−8 17.57×10−8 1,620.53×10−8 m3/Kg. decreased significantly to downstream. High indicates sample contains metal elements. In determining iron oxide, use X-Ray Fluorescence assisted by Diffractometer testing determine minerals. confirm oxide sample. There are Al Fe properties sedimentation. Vibrating Sample Magnetometer confirmed saturation 0.06 9.50 (emu/g), remanent 0.001 0.575 (emu/g) coercivity field 10 60.15 (Oe). pattern mineral structures, namely Coesite, Magnetite, Cristobalite, Portlandite, Quartz, Anatase, Goethite, Tridymite, Gibsyte, Stishovite, Grasullaria, Labradorite Wuestite. These indicate novelty Solo, East Java. HIGHLIGHTS We found several important points this research: formed formations lifting faults rich oxides decreases with distance ferromagnetic S-type hysterisis curve With values, magnetism high corrosivity GRAPHICAL ABSTRACT