IJOG : Indonesian Journal on Geoscience
Vol 7, No 2 (2012)

Thermal and Infrared Studies of Garnierite from the Soroako Nickeliferous Laterite Deposit, Sulawesi, Indonesia

Sufriadin, Sufriadin ( Department of Geological Engineering, Gadjah Mada University, Yogyakarta 55281 )
Idrus, Arifudin ( 1Department of Geological Engineering, Gadjah Mada University, Yogyakarta 55281 )
Pramumijoyo, S. ( 1Department of Geological Engineering, Gadjah Mada University, Yogyakarta 55281 )
Warmada, I. W. ( 1Department of Geological Engineering, Gadjah Mada University, Yogyakarta 55281 )
Nur, I. ( Department of Geological Engineering, Gadjah Mada University, Yogyakarta 55281 )
Imai, A. ( Department of Earth Science and Technology, Akita University, Akita 010-8512 )
Imran, A. M. ( Department of Geological Engineering, Hasanuddin University, Makassar 90245 )
Kaharuddin, Kaharuddin ( Department of Geological Engineering, Hasanuddin University, Makassar 90245 )



Article Info

Publish Date
30 Jun 2014

Abstract

DOI: 10.17014/ijog.v7i2.137Mineralogical characterization of some garnierite samples from Soroako have been conducted using X-ray diffraction, thermal analysis, and infrared spectroscopy methods. XRD patterns reveal the samples mainly containing the mixture of kerolite (talc-like phase) and serpentine with minor smectite, sepiolite, and silica. Thermal analyses of garnierite samples indicated by DTA curves are in good agreement with patterns that have been reported in literature. Three endothermic peaks normally occur in the ranges between 58º C and <800º C illustrating three steps of weight losses: adsorbed, bound, and hydroxyl/crystal water. One additional weight loss in low temperature region of sepiolite is corresponding to the lost of zeolitic water. Infrared spectra appeared in 3800 - 3200 cm-1 region generally exhibit broad absorption bands, indicating low crystallinities of studied samples and can be assigned to the presence of hydroxyl group bonded to octahedral coordination mainly Mg atom. The bands observed at 1660 cm-1, 1639 cm-1, 1637 cm-1, and 1633 cm-1 in all samples indicate water molecules. FTIR spectra displaying the strong bands at 1045 cm-1, 1038 cm-1, and 1036 cm-1 could be related to the presence of Si-O-Si bonds linking to tetrahedral coordination. The strong absorption bands appeared at 511 cm-1, 505 cm-1, 499 cm-1, and 496 cm-1 in respective samples are attributed to divalent cation bonds (e.g. Mg, Ni-O). Both TG/DTA and FTIR seem to be the powerful tool in diagnosing the crystal chemistry of garnierite which is mainly composed of phyllosilicate minerals.

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Journal Info

Abbrev

IJOG

Publisher

Subject

Earth & Planetary Sciences

Description

The spirit to improve the journal to be more credible is increasing, and in 2012 it invited earth scientists in East and Southeast Asia as well as some western countries to join the journal for the editor positions in the Indonesia Journal of Geology. This is also to realize our present goal to ...