The origin and composition of iron sand deposit in the southern coast of Yogyakarta

摘要: The iron sand mineral deposit in the southern coast of Yogyakarta is analyzed. exploration area spans beach to east Opak river. Longitudinal analysis magnetic-sand composition along shoreline with varied distance from river support argument that minerals originated volcanic materials brought by flow combination littoral drift concentrated waves. contents ranging 5.85 % 95,11% are revealed, sampling banks. magnetic component iron-sand mainly composed magnetite, maghemite, ilmenite and titanomagnetite whereas non-magnetic residue consists silica, alumina calc.