PENENTUAN NILAI SATURASI MAGNETIK BATUAN PERIDOTIT ASAL DESA AWANG BANGKAL BARAT KABUPATEN BANJAR KALIMANTAN SELATAN

Abstract

Abstrak : Peridotite rocks are ultra-alkaline rocks that igneous rocks which high
in mineral content of FeO, and also a magnetic mineral. Each rock type has
specific properties and characteristics are manifested in the magnetic field in
magnetic parameters of rocks or minerals. One way to provide an overview of the
composition and type of magnetic minerals in these rocks is to determine the
magnetic saturation curve. Giving Isothermal Remanent Magnetism (IRM) is
done using instruments Electromagnetic Weiss gradually began to flow 1A, 2A,
3A 10 A, etc., until the sample reaches saturation magnetic intensity. On the
measurement of magnetic saturation curve samples will be given a very large
magnetic field (until 0.8 T) gradually by using an electromagnet. The intensity of
magnetization, as measured by Minispin magnetometer, and then plotted as a
function of the magnitude of a given field. The shape of this saturation curve will
provide an overview of the composition and type of magnetic minerals that exist
in the sample. The results showed that the shape of the IRM curve (remanent
magnetic intensity) is reached more quickly saturated the H <300 mT the
peridotite rock in the identification of the mineral magnetite. The identification of
these magnetic minerals is also based on the curvature of the IRM (remanent
magnetic intensity), the composition obtained is Fe3O4.
Keywords: peridotite rocks, magnetic saturation, Isothermal Remanent
Magnetism (IRM)