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Characteristics of Chromite Deposits at North Kabaena District, Bombana Regency, Southeast Sulawesi Province, Indonesia Hasria; Masri; Suryawan Asfar; Arisona; Ali Okto; La Ode Restele; La Ode Ngkoimani; Rika Yustika
Journal of Geoscience, Engineering, Environment, and Technology Vol. 6 No. 2 (2021): JGEET Vol 06 No 02 : June (2021)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2021.6.2.6424

The study area is located in North Kabaena District, Bombana Regency, Southeast Sulawesi. This paper is aimed to describe characacristics of chromite deposits. This study is conducted in three stages, three stages including desk study, field work and laboratory analysis. Desk study mainly covers literature reviews. Field work includes mapping of surface geology and sampling of representative rocks types. Laboratory analysis includes the petrologic observation of handspecimen samples, petrographic analysis of the thin section and ore microscopy for polished section. The results of petrographic analysis show that olivine minerals are generally replaced by minerals orthopyroxene and has been alterated by lizardite type serpentine veins with a fractured structure. The mineral olivine is also replaced by the mineral chrysotile as a secondary mineral with a fibrous structure. Based on ore microscopy analysis show that chromite has generally experienced a lateritification process and has been replaced by magnetite, hematite and geotite minerals. Chromite has experience process of weathering and alteration from its source rock caused by tectonics that occurred in the study area. The results shows that the characteristics of chromite deposits in North Kabaena District Chromite deposits has generally encountered in peridotite rock which have a grain size of 0.3-20 cm. Furthermore, chromite deposits in the study area are also encountered in podiform deposits, distributed locally and shows podiform to tubular shape with the dimensions of 30-60cm.

Serpentinization Study On Ultramafic Rock at Morombo Area, Lasolo Islands District, North Konawe Regency, Southeast Sulawesi, Indonesia Hasria; Febiyanti; Masri; Ali Okto; Erzam S. Hasan; La Hamimu; Sawaludin; La Ode Muhammad Iradat Salihin; Wahab
Journal of Geoscience, Engineering, Environment, and Technology Vol. 7 No. 1 (2022): JGEET Vol 07 No 01 : March (2022)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2022.7.1.6643

The research is in Morombo area, North Konawe Regency, Southeast Sulawesi. The purpose of this study was to determine the characteristics of serpentinized ultramafic rock and serpentine paragenesis. Research was conducted using field observations and laboratory analysis consisting of petrographic and geochemical analysis in the form of X-Ray Fluorosence (XRF). Petrographic analysis was carried out to identify the mineral content and textures in the rock and to determine the percentage of serpentine mineral presence. Both of these rocks are petrographically dominated by primary minerals olivine and clinopyroxine and secondary minerals namely lizardite, chrysotile, antiorite and opaque minerals. The XRF analysis was to determine the elements of Ni, Fe, Co, MgO, SiO2, CaO, Al2O3 and P in ultramafic rocks. The results of petrographic analysis show that serpentinized ultramafic rocks in the study area consist of serpentinized dunite and serpentinized peridotite. The formation of clay minerals in rocks does not occur because of the low serpentinization process in the rock. The results of XRF analysis showed that all samples in the bedrock showed Ni content above 0.2%. This is caused by the enrichment of Ni which is interpreted as a result of the serpentinization process along with the formation of lizardite in the rock. The serpentinization sub-processes in the study area comprised by hydration, serpentine recrystallization, and deserpentinization. Serpentine paragenesis is formed from the mid-oceanic ridge ocean floor, the orogenic phase to weathering. Substitution of Mg by Ni in ultramafic rocks will produce Ni-Serpentin. It is estimated that in the research area lizardite and chrysotile lizardite and chrysotile are the causes of Ni enrichment in bedrocks. The serpentinization characteristics of ultramafic rocks in the study area show a low to moderate level of serpentinization.

Karakteristik batugamping Formasi Wapulaka dan pemanfaatannya sebagai bahan galian industri di Desa Wuna, Kabupaten Muna, Sulawesi Tenggara Ali Okto; Masri Masri; Marwan Zam Mili; Hasria Hasria
Jurnal Mineral, Energi dan Lingkungan Vol 5, No 1 (2021): Juni
Publisher : Fakultas Teknologi Mineral, Universitas Pembangunan Nasional (UPN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jmel.v5i1.4030

Daerah penelitian merupakan kawasan karst yang tersusun atas batugamping terumbu berumur Plistosen. Secara administrasi, daerah penelitian terletak pada Desa Wuna, Kabupaten Muna, Sulawesi Tenggara. Hamparan batugamping terumbu tidak hanya dapat dimanfaatkan dalam geokonservasi, namun juga sebagai bahan industri. Metode yang digunakan adalah metode lapangan geologi dan pekerjaan laboratorium dengan data luaran utama adalah deskripsi sayatan tipis batugamping dan kandungan senyawa mayor batugamping. Pengolahan data lapangan menggunakan analisis petrografi dalam pemerian batuan dan analisis geokimia senyawa mayor untuk mengetahui jenis pemanfaatan batugamping. Batugamping dijumpai pada satuan perbukitan karst dan pedataran. Litologi penyusun berupa wackestone dan packstone yang kaya akan fragmen bioclast, kalsit, aragonit, mineral sekunder, dan porositas yang intens. Batugamping didominasi oleh CaO (kalsium oksida) dengan kadar rata-rata 94,44%. Beberapa sampel memiliki kadar MgO (magnesium oksida) tinggi hingga mencapai 4,4% yang mengindikasikan proses dolomitisasi. Data geokimia menunjukkan batugamping dapat digunakan untuk berbagai keperluan bahan industri seperti: industri semen, bata silika, soda abu, karbit, dan pemurnian baja. Batugamping packstone dan wackstone untuk bahan industri dicirikan oleh kelimpahan lumpur karbonat dan aragonit, serta minimnya mineral sekunder.

Fasies Batuan Metamorf Daerah Wumbubangka, Kecamatan Rarowatu Utara, Kabupaten Bombana, Provinsi Sulawesi Tenggara hasria hasria; Suryawan Asfar; Adriyansyah Adriyansyah; Masri Masri; Muliddin Muliddin; Arisona Arisona; Al Firman; Ali Okto; Laode M Golok Jaya
Jurnal Geomine Vol 9, No 1 (2021): Edisi April 2021
Publisher : Universitas Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33536/jg.v9i1.896

Daerah penelitian terletak di daerah Wumbubangka, Kecamatan Rarowatu Utara, Kabupaten Bombana, Provinsi Sulawesi Tenggara.Penelitian ini bertujuan untuk mengindentifikasi jenis batuan metamorf dan fasies metamorfisme yang terdapat di daerah penelitian. Metode penelitian yang digunakan terdiri dari studi pustaka, pengambilan sampel di lapangan, analisis labroratorium serta interpretasi data. Hasil penelitian menunjukkan bahwa litologi daerah penelitian umumnya terdiri dari sekis mukovit dan marmer. Sekis muskovit memiliki tekstur berupa lepidoblastik, struktur schistose, sedangkan marmer memiliki tekstur sisa dan struktur non foliasi. Adapun komposisi mineralnya terdiri dari kalsit, klorit, kuarsa, muskovit, biotit, glukofan dan mineral opak. Adapunfasies metamorfime batuan metamorf di daerah penelitianadalah fasies sekis hijau yang dicirikan dengan kehadiran mineral muskovit, klorit, biotit, kalsit dan kuarsa.Fasies sekis hijau ini diinterpretasikan terbentuk pada temperatur 300°C-500°C.

Karakteristik batugamping Formasi Wapulaka dan pemanfaatannya sebagai bahan galian industri di Desa Wuna, Kabupaten Muna, Sulawesi Tenggara Ali Okto; Masri Masri; Marwan Zam Mili; Hasria Hasria
Jurnal Mineral, Energi dan Lingkungan Vol 5, No 1 (2021): Juni
Publisher : Fakultas Teknologi Mineral, Universitas Pembangunan Nasional (UPN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jmel.v5i1.4030

Daerah penelitian merupakan kawasan karst yang tersusun atas batugamping terumbu berumur Plistosen. Secara administrasi, daerah penelitian terletak pada Desa Wuna, Kabupaten Muna, Sulawesi Tenggara. Hamparan batugamping terumbu tidak hanya dapat dimanfaatkan dalam geokonservasi, namun juga sebagai bahan industri. Metode yang digunakan adalah metode lapangan geologi dan pekerjaan laboratorium dengan data luaran utama adalah deskripsi sayatan tipis batugamping dan kandungan senyawa mayor batugamping. Pengolahan data lapangan menggunakan analisis petrografi dalam pemerian batuan dan analisis geokimia senyawa mayor untuk mengetahui jenis pemanfaatan batugamping. Batugamping dijumpai pada satuan perbukitan karst dan pedataran. Litologi penyusun berupa wackestone dan packstone yang kaya akan fragmen bioclast, kalsit, aragonit, mineral sekunder, dan porositas yang intens. Batugamping didominasi oleh CaO (kalsium oksida) dengan kadar rata-rata 94,44%. Beberapa sampel memiliki kadar MgO (magnesium oksida) tinggi hingga mencapai 4,4% yang mengindikasikan proses dolomitisasi. Data geokimia menunjukkan batugamping dapat digunakan untuk berbagai keperluan bahan industri seperti: industri semen, bata silika, soda abu, karbit, dan pemurnian baja. Batugamping packstone dan wackstone untuk bahan industri dicirikan oleh kelimpahan lumpur karbonat dan aragonit, serta minimnya mineral sekunder.

PENGARUH GEOMORFOLOGI TERHADAP POLA DISTRIBUSI UNSUR NIKEL DAN BESI PADA ENDAPAN NIKEL LATERIT DI KABUPATEN BUTON TENGAH-SULAWESI TENGGARA Hasria Hasria; Suryawan Asfar; La Ode Ngkoimani; Ali Okto; Rio Irhan Mais Cendra Jaya; Risal Sepdiansar
Geosapta Vol 7, No 2 (2021): Juli 2021
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jg.v7i2.10716

Penelitian ini terletak di Pulau Kabaena yakni di Desa Wulu Kecamatan Talaga Raya Kabupaten Buton Tengah Provinsi Sulawesi Tenggara. Tujuan dari penelitian ini untuk mengindentifikasi pengaruh geomorfologi terhadap pola distribusi kandungan unsur nikel dan besi pada endapan nikel laterit. Metode penelitian terdiri dari studi pustaka; pengamatan geomorfologi dan pengambilan sampel yang representatif; analisis laboratorium menggunakan X–Ray Flourenscense (XRF); serta analisis data. Hasil penelitian menunjukkan bahwa rata-rata pola distribusi kandungan unsur nikel dan besi mengalami peningkatan pada geomorfologi perbukitan tinggi dengan kemiringan agak curam di zona limonit dan saprolit. Hal ini diinterpretasikan karena terdapatnya rekahan-rekahan pada geomorfologi tersebut sehingga memudahkan masuknya air sehingga proses pelapukan/laterisasi yang terjadi akan meningkat. Adapun kandungan unsur nikel mengalami pengkayaan (enrichment) di zona saprolit sedangkan unsur Fe mengalami pengkayaan di zona limonit. Hal ini disebabkan karena unsur Ni merupakan unsur yang mempunyai mobilitas yang tinggi (mobile) sehingga selama proses pelapukan/laterisasi, akan tertransportasi ke arah bawah permukaan dan terkonsentrasi pada bagian bawah yakni zona saprolit, sedangkan unsur Fe merupakan unsur yang immobile yang tidak mudah bergerak ke arah bawah sehingga terkonsentrasi pada bagian atas yakni zona limonit.

Morphotectonic Control of Land Movements at Wundulako Region, Kolaka Regency, Southeast Sulawesi Province, Indonesia Martono; Hasria; Suryawan Asfar; Muhammad Arba Azzaman; La Ode Ngkoimani; Ali Okto; La Hamimu; Irawati; Sawaludin; La Ode Muhammad Iradat Salihin; Wahab
Journal of Geoscience, Engineering, Environment, and Technology Vol. 7 No. 2 (2022): JGEET Vol 07 No 02 : June (2022)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2022.7.2.9235

This research is located at Wundulako District, Kolaka Regency, Southeast Sulawesi Province. The purpose of this study are to determine the level of tectonic activity and the effect of tectonic activity on the land movement of the study area. Based on the DEM (Digital Elevation Model) analysis, geomorphology of the study area is dominated by mountains unit that indicate the influence of tectonic activity. Geomorphological aspects were analyzed to determine the tectonic classes in the study area such as watershed and non-watershed analysis. The results showed that, tectonic class of the study area is classified as very high and moderate tectonic class. The effect of tectonic class level on land movement in the study area shows a least correlation. This interprets that the cause of land movement at study area is not only influenced by tectonic factors but is also influenced by other factors such as rainfall, lithological conditions, geomorphology, earthquakes, and human activities. This shows that morphotectonic control has little effect on the land movements at Wundulako District, Kolaka Regency, Southeast Sulawesi Province, but is also influenced by other factors such as rainfall, lithological conditions, geomorphology, earthquakes, and human activities.

Edukasi Mitigasi Bencana Banjir Berbasis Komunitas Masyarakat di Kelurahan Wundumbatu Kecamatan Poasia Kota Kendari, Provinsi Sulawesi Tenggara Hasria Hasria; Arisona Arisona; Irawati Irawati; Syamsul Razak Haraty; Ali Okto
Jurnal Abdidas Vol. 3 No. 3 (2022): June, Pages 355-611
Publisher : Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/abdidas.v3i3.603

Kelurahan Wundumbatu termasuk dalam Kecamatan Poasia yang berada di Kota Kendari, Provinsi Sulawesi Tenggara. Wilayah ini berada pada pedataran rendah dan bersebelahan dengan sungai Anduonohu yang sering mengalami banjir pada musim hujan karena luapan air sungai. Adapun tujuan yang dan pengabdian Program Kemitraan Masyarakat (PKM) ini adalah untuk meningkatkan kesiapsiagaan masyarakat dalam menghadapi bencana banjir. Metode yang digunakan pada pengabdian ini adalah menggunakan aplikasi zoom, namun pada proses pendirian posko relawan dan pembuatan sistem peringatan dini, dilakukan langsung di lapangan dengan tetap mengacu pada protokol kesehatan. Hasil yang diperoleh pada kegiatan pengabdian PKM adalah telah memberikan dampak positif yakni mengedukasi masyarakat sehingga memperoleh ilmu dan pengalaman tentang cara memitigasi bencana banjir. Selain itu, juga dihasilkan adanya peta resiko bencana banjir wilayah kelurahan, pembentukan posko relawan masyarakat dalam rangka kegiatan aksi untuk penguatan kesiapsiagaan dan penguatan kelola risiko serta adanya sistem peringatan dini banjir yang dapat mendukung terbentuknya Kelurahan Wundumbatu sebagai kelurahan tanggap dan tangguh terhadapnbencana banjir dengan tetap mengacu pada protokol kesehatan yang dikeluarkan oleh pemerintah RI terkait Covid-19.

Analisis Morfometri Sub-DAS Lahundape Sebagai Penyebab Proses Sedimentasi di Teluk Kendari Suryawan Asfar; Ali Okto; Andi Makkawaru; Isran Naim
Jurnal Rekayasa Geofisika Indonesia Vol 1, No 03 (2019): Edisi Desember JRGI (Jurnal Rekayasa Geofisika Indonesia)
Publisher : Jurnal Rekayasa Geofisika Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar

The Lahundape Sub-watershed is located in the area of Kendari City and Konawe District. Some of the problems that occur in the Kendari Bay region include siltation caused by sedimentary materials from all rivers that lead to Kendari Bay, one of which is the Lahundape River. One type of analysis that can be used to solve problems that arise is to do morphometric analysis. From the results of data processing and analysis found that the Lahundape Sub-watershed has a drainage density (Dd) of 11.6 km/km2, a very high stream frequency (Fs) value of 131.66, a drainage texture of 38.63, a factor of shape of 0.146 so that it can be grouped into elongated watersheds, roundness ratio values of 0.155 or Rc value <0.5, elongation ratio values of 0.216, surface flow lengths of 5.810 km, basin reliefs of 5.32 km or 5.324 meters, values of relief ratio of 0.77 and the roughness value of the Lahundape Sub-watershed is 61.82. So it can be concluded that the Lahundape Sub-watershed has a river flow that flows through rocks with soft resistance, so the transport of sediment transported will be greater than that the Lahundape Sub-watershed has sloping conditions that are quite sloping and high enough relief so it will tend to contribute on erosion and will later result in loss of sediment deposits in the sub-watershed area.

Analisis Aspek Linier Morfometrik Sub-DAS Lahundape Menggunakan Teknologi Sistem Informasi Geografis (SIG) pada Wilayah Kota Kendari Suryawan Asfar; Ali Okto; Andi Makkawaru; Mirnayanti Karim
Jurnal Rekayasa Geofisika Indonesia Vol 1, No 02 (2019): Edisi Agustus JRGI (Jurnal Rekayasa Geofisika Indonesia)
Publisher : Jurnal Rekayasa Geofisika Indonesia

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This research activity was carried out in the Lahundape Sub-watershed, using morphometric linear analysis where the analysis was carried out by extracting river networks using digital elevation data, namely Digital Elevation Model (DEM). From the results of data processing and analysis which found that the area of the Lahundape Sub-basin reaches 6.97 km2, the circumference of the Lahundape Sub-basin area reaches 23.74 km, the length of the Lahundape Sub-watershed reaches 6.91 km, the width of the Lahundape Sub-Basin reaches 1.01 km. The Lahundape Sub-watershed has a total of 5 river orders with a total number of rivers as much as 917, the length of the river flow The Lahundape Sub-watershed has increased in order 1 and decreased to order 5, with an average value of river length between 0.06 km up to 0.78 km and the total Lsm value reaches 1.73 km. The length of the river flow ratio of each order has increased were for the 2nd order/1st order (II/I) of 0.45 km, 3rd order/2nd order (III/II) of 0.46 km, 4th order/3rd order (IV/III) of 0.72 km, 5th order/4th order (V/IV) of 0.87 km. The Lahundape Sub-watershed river branching ratio has an average value of 3.42, where for the value of 1st order/2nd order of 4.72, 2nd order/3rd order of 4.31, 1st order 3/4th order of 2.92, and for 4thorder/5th order of 1.71.

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