Karakterisasi Mineral Magnetik Batuan Peridotit Daerah Awang Bangkal Kabupaten Banjar Kalimantan Selatan Menggunakan Metode XRD dan King

Abstract

Study the nature of magnetism in rocks that has been carried out at the research of peridotite rocks in Awang Bangkal Banjar Regency has not finished, still need to do further research. More specific details of research has been done is about the characterization of the magnetic minerals in peridotite rocks in the area Awang Bangkal, Banjar Regency, South Kalimantan, which aims to identify the type of magnetic minerals, characterize magnetic minerals including multidomain, single domain or pseudo single domain and the estimate magnetic mineral’s grain size. This study uses XRD test to find out the existing content of magnetic minerals in peridotite samples, the method of King (the ratio between the magnetic susceptibility with the anhysteretic susceptibility) and decay Anhysteretic Remanent Magnetization (ARM) to estimate the grain size of magnetic minerals in peridotite samples. XRD results show that the magnetic minerals contained in the peridotite samples are hematite and magnetite. The ARM decaying curve showed that the estimated peridotite rocks in the research are multidomain to pseudosingle domain and the size are big. While the distribution of grain size between below 0.1 μm up to ≈ 5 μm.

Keywords

• peridotite, grain size, magnetic mineral, x-ray difraction, anhysteretic, susceptibility.