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All Journal IJOG : Indonesian Journal on Geoscience MUSTEK ANIM HA Journal TEPAT: Teknologi Terapan untuk Pengabdian Masyarakat Indonesian Journal on Geoscience Indonesian Journal on Geoscience Journal of Geology and Exploration
A. M. Imran
Department Of Geological Engineering Hasanuddin University Makasar
Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Engineering Mechanical Engineering Public Health

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Journal : Indonesian Journal on Geoscience

 1 
Thermal and Infrared Studies of Garnierite from the Soroako Nickeliferous Laterite Deposit, Sulawesi, Indonesia Sufriadin, Sufriadin; Idrus, Arifudin; Pramumijoyo, S.; Warmada, I. W.; Nur, I.; Imai, A.; Imran, A. M.; Kaharuddin, Kaharuddin
Indonesian Journal on Geoscience Vol 7, No 2 (2012)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.7.2.77-85

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.
Coral Reef Development as an Indicator of Seal Level Fluctuation: A Preliminary Study on Pleistocene Reef in Bulukumba, South Sulawesi Imran, A. M.; Farida, M.; Arifin, M. F.; Husain, R.; Hafidz, A.
Indonesian Journal on Geoscience Vol 3, No 1 (2016)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.3.1.53-66

Abstract

DOI:10.17014/ijog.3.1.53-66Pleistocene reefs in eastern part of Indonesia are abundantly found along the coast as raised reef. They express highly tectonized and/or uplifted area characterized by several terraces. Therefore the reef size is narrow. This research is located at Bira District of Bulukumba Regency or it lies at the southern tip of South Sulawesi Peninsula. The objective of this research is to define depositional environment based on coral development. Several methods were applied such as intersect lines which were perpendicular to the cliff, geochemical and petrographic analyses, as well as paleoenvironment interpretation. Three facies are described at the Pleistocene reef, namely 1) Reef Front Facies, 2) Reef Core Facies, 3) Back Reef Facies. Based on facies association and organism accumulation, the depositional environment of Pleistocene reef is interpreted to be developed in a small reef complex on an unstable basement. The reef has experienced at least 3 (three) times of sea level fluctuation.
Co-Authors ., Agustinus ., Bahrul ., Kaharuddin ., Safruddim A. Hafidz A. Imai A. Imai A., Dwi Nuraeni Adi Maulana, Adi Arifin, M. F. Arifudin Idrus Azrul, Muh. Zulfahmi Busthan Azikin Fajrin, Muh. Farida, M. Fathurrahman Fathurrahman Fauzi Arifin Haerany Sirajuddin Hafidz, A. Halide, Lidemar Hazairin Zubair, Hazairin Hidayah, Bahrul Husain, R. Husain, Ratna I Wayan Warmada I. Nur I. Nur Imai, A. Irto Suleman, Irto Jamal Rauf Husain Jannah, A. Mifthahul Kaharuddin Kaharuddin Kaharuddin, Kaharuddin M. F. Arifin M. Farida Meinarni Thamrin Meutia Farida Mudinillah, Adam Nur, I. Nurul Ikhsan Pachri, Hendra Pramumijoyo, S. R. Husain Rohaya Langkoke S. Pramumijoyo S. Pramumijoyo Safri Burhanuddin Siti Helmyati Sufriadin, Sufriadin Sultan .