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ANALISIS KANDUNGAN MINERAL LOGAM DENGAN MENGGUNAKAN XRD DAN XRF PADA SINGKAPAN BERALTERASI TINGGI DAN RENDAH DI LOKASI PENAMBANGAN OPEN PIT KALIKUNING DAN LEROKIS PT. BATUTUA TEMBAGARAYA PROVINSI MALUKU SIRAJU, ASRUL; Hutabarat, Johanes; Sukiyah, Emi; Haryanto, Agus Didit
Bulletin of Scientific Contribution Vol 16, No 3 (2018): Bulletin of Scientific Contribution GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

ABSTRAKPenelitian ini dilakukan di 4 lokasi singkapan batuan Vulkanik yang termanifestasi dengan alterasi hidrothermal wilayah tambang KaliKuning dan Lerokis Open PIT PT Batutua Tembagaraya. Metode penelitian yang dilakukan dengan survey lapangan dan pengambilan sampel batuan Vulkanik dari singkapan yang secara visual beralterasi rendah dan tinggi yang berada di 4 lokasi tersebut. Setelah pengambilan sampling batuan, batuan sampel disiapkan untuk pengamatan Petrografi, XRD,XRF serta analisis hasil pengukuran kandungan mineral dan logam oksida. Hasil pengamatan Petrografi, analisa hasil pengukuran XRD dan XRF maka dijumpai komposisi minireal penyusun utama maupun ubahan pada wilayah KaliKuning lebih bervariasi daripada Lerokis. Sedangkan kandungan unsur logam pada wilayah singkapan KaliKuning pada sampel KK-FW dan pada sampel Lerokis LR-FW memiliki komposisi logam oksida yang lebih dominan dari sampel KaliKuning KK-HW dan sampel Lerokis LR-HW. Dari hasil pengamatan wilayah KaliKuning Sampel KK-FW yang berada di Selatan-Barat, memiliki intensitas ubahan sedang, mineral sekunder yang teramati Klorit, Epidot, Okslda Besi, Kalsit, Kuarsa, Biotit dan Mineral Opak, menunjukan Meneral utama yang terkandung dilokasi ini adalah Kuarsa (SiO2)61,98%, Clinochlore, Group Piroksen dan Illite. Sedangkan logam oksida yang paling menonjol adalah Alluminium Oksida (Al2O3) 16,24%, Oksida Besi (Fe2O3) 7,46%, serta Mangan Oksida (MgO) 5,22%. Bagian Utara-Timur KaliKuning, sampel KK HW teridentifikasi Mineral yang mengalami ubahan sedang yaitu Klorit, Kuarsa, Biotit, Kalsit, Mineral Opak dan Illite. Mineral primer yaitu Kuarsa Cristobalite, Kristal Feldspar , Plagioklas. Hasil pengukuran XRD dan XRF menunjukan meneral utama yang terkandung dilokasi ini adalah Kuarsa Cristobalite (SiO2) 65,26%, Kristal Feldspar dan Plagioklas. Logam oksida yang paling dominan yakni Alluminium Oksida (Al2O3) 16,55%, Oksida Besi (Fe2O3) 3,9% dan Mangan Oksida (MgO) 0,82%. Sedangkan wilayah Lerokis sampel LR-FW yang berada di Selatan, mineral utama yang teramati yakni Kuarsa dan Plagioklas dengan intensitas ubahan kuat. Plagioklas tergantikan oleh Serisit dan Masadasar yang hampir seluruhnya terubah oleh Kuarsa, Serisit dan Mineral Opak. Hasil data pengukuran XRD dan XRF menunjukan meneral utama dilokasi ini adalah Plagioklas dan Kuarsa (SiO2) 67,3%. Unsur logam oksida paling menonjol adalah Alluminium Oksida (Al2O3) 18,73% dan Oksida Besi (Fe2O3) 2,13%. Untuk Lerokis LR-HW bagian Selatan memiliki Mikrokristalin Plagioklas dan Gelas vulkanik dengan intensitas ubahan tinggi, terubahkan oleh Mineral Lempung, Klorit dan Serisit. Hasil pengukuran XRD dan XRF menunjukan Kuarsa, Clinochlore, Group Piroksen dan Illite. Logam oksida yang paling tinggi adalah Aluminium Oksida (Al2O3) 15,88%, Oksida Besi (Fe2O3) 7,15% dan Mangan Oksida (MgO) 7,36%.Kata Kunci: Wetar, KaliKuning, Lerokis, Alterasi, Mineral dan Logam Oksida

Pengaruh Kontrol Struktur Geologi Daerah Vulkanik terhadap Aliran Air Tanah di Daerah Gekbrong, Kabupaten Cianjur, Provinsi Jawa Barat Ismawan, Ismawan; Hendarmawan, Hendarmawan; Hutabarat, Johanes; Isnaniawardhani, Vijaya
Bulletin of Scientific Contribution Vol 16, No 3 (2018): Bulletin of Scientific Contribution GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Aliran air dari hulu ke hilir dipengaruhi oleh berbagai hal, terutama adalah jenis batuan penyusun di daerah resapan serta intensitas deformasinya. Kombinasi struktur sesar dan kekar dapat memodifikasi variasi permeabilitas dari sangat permeabel (akuifer bagus) sampai dengan sangat kedap (akuiklud). Tujuan penelitian ini yaitu untuk mengetahui kondisi geologi, baik kondisi geologi permukaan maupun bawah permukaan yang terdiri atas batuan penyusun, tatanan tektonik dan pola strukturnya serta pengaruhnya terhadap aliran airtanah. Secara administratif daerah penelitian meliputi daerah Kecamatan Gekbrong, Kabupaten Cianjur, Provinsi Jawa Barat.Daerah penelitian dibagi menjadi 3 satuan geomorfologi, yaitu Satuan Geomorfologi Tubuh Gunungapi Strato, Satuan Geomorfologi Kaki Gunungapi Strato dan Satuan Geomorfologi Perbukitan. Urutan satuan stratigrafinya, dari yang tua sampai yang muda, adalah Satuan Breksi Tuff, Satuan Breksi Vulkanik, Satuan Tuff Breksian, Satuan Lava Andesit dan Lava Basaltik. Batuan di daerah penyelidikan umumnya berasal dari endapan volkanik dan dapat dikelompokan berdasarkan kisaran nilai tahanan jenisnya. Sesar-sesar yang ada di permukaan adalah : Sesar Gekbrong, Sesar Cibeleng dan Sesar Cipadang, ketiganya berarah relatif baratdaya – timurlaut, sedangkan sesar di bawah permukaan berarah timurlaut – baratdaya tidak diberi nama. Daerah resapan dibatasi sesuai dengan batas sesar yang berarah timurlaut – baratdaya, mengindikasikan bahwa sesar ini bertindak sebagai sealing fault.Kata Kunci: Gekbrong, Endapan Vulkanik, Struktur Geologi, Daerah Resapan, Resistivitas

SEBARAN DAN KARAKTERISTIK BATUAN ULTRAMAFIK SEBAGAI POTENSI NIKEL LATERIT SERTA KAITANNYA DENGAN PENYIMPANAN KARBON PADA DAERAH SOROWAKO Sambodo, Tri Hananto Priyo; Sukiyah, Emi; Hutabarat, Johanes
Indonesian Mining Journal Vol 27 No 2 (2024): Indonesian Mining Journal, October 2024
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol27.No2.2024.1608

Ultramafic rocks, as the main raw material for the formation of nickel laterite in nature, are important object to study and explore for their availability since nickel is very important mineral in producing batteries for electric cars which is expected to reduce carbon emissions in the future. Along with that, the storage of carbon dioxide in ultramafic rocks is considered as one of the safest storage method because carbon dioxide reacts naturally with magnesium-rich minerals contained in these rocks. The reaction between carbon dioxide and magnesium-rich minerals such as olivine, pyroxene, and serpentine will produce magnesite (MgCO3), which is more stable in nature. Ultramafic rocks have wide distribution in southeastern arm of Sulawesi Island, especially in Sorowako and the surrounding areas. The method used in this research is an observation method on outcrops and supported by laboratory analysis. Ultramafic rocks in Sorowako area have wide distribution and have varying degrees of serpentinization. The magnesium (Mg) element contained in the research area is widely spread as well as the development of geological structure allows the potential development of ultramafic rocks as carbon storage.

SEBARAN DAN KARAKTERISTIK BATUAN ULTRAMAFIK SEBAGAI POTENSI NIKEL LATERIT SERTA KAITANNYA DENGAN PENYIMPANAN KARBON PADA DAERAH SOROWAKO Sambodo, Tri Hananto Priyo; Sukiyah, Emi; Hutabarat, Johanes
Indonesian Mining Journal Vol 27 No 2 (2024): Indonesian Mining Journal, October 2024
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol27.No2.2024.1608

Ultramafic rocks, as the main raw material for the formation of nickel laterite in nature, are important object to study and explore for their availability since nickel is very important mineral in producing batteries for electric cars which is expected to reduce carbon emissions in the future. Along with that, the storage of carbon dioxide in ultramafic rocks is considered as one of the safest storage method because carbon dioxide reacts naturally with magnesium-rich minerals contained in these rocks. The reaction between carbon dioxide and magnesium-rich minerals such as olivine, pyroxene, and serpentine will produce magnesite (MgCO3), which is more stable in nature. Ultramafic rocks have wide distribution in southeastern arm of Sulawesi Island, especially in Sorowako and the surrounding areas. The method used in this research is an observation method on outcrops and supported by laboratory analysis. Ultramafic rocks in Sorowako area have wide distribution and have varying degrees of serpentinization. The magnesium (Mg) element contained in the research area is widely spread as well as the development of geological structure allows the potential development of ultramafic rocks as carbon storage.

HUBUNGAN ANTARA GEOKIMIA MINYAK BUMI DAN BATUAN INDUK DI SUB-CEKUNGAN ARDJUNA TENGAH, CEKUNGAN JAWA BARAT UTARA Yazid, Yusron; Haryanto, Agus Didit; Hutabarat, Johanes
Bulletin of Scientific Contribution Vol 15, No 1 (2017): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (972.943 KB)

ABSTRACTThe research area is located in offshore North West Java, Central Ardjuna Sub-Basin that belonging to PT. Pertamina Hulu Energi Abar. The study focused on the source rock in Talang Akar Formation and hydrocarbons contained in the area. The data used in this research is the source rock and oil geochemical data. Source rock data is evaluated from wells YZD-1, YY-1 and DZN-1. From the analysis of the source rock was found that the source rock generate the hydrocarbons in the well YZD-1 and YY-1. The source rock is dominated by organic material with kerogen type II-III and III-II are derived from terrestrial organic material that mixes with algae tend to produce a mixture of oil and gas. Source rock organic material in wells YZD-1 depth interval 8421.9-8450 ft. deposited in the deep lake area in the oxic conditions. While the organic material in the source rock in the well YY-1 depth interval 6898.92-6909ft. deposited in the shallow lake in the oxic conditions. There are four oil samples, namely samples DST1 CC-1, CC-1 DST3, FZE-1 DST1, and FZE-1 DST2. The analysis showed that there is a positive correlation between samples and showed that the sample is deposited on the deep lake environments and shallow lakes with a mixture of organic material higher plants and algae. Based on the geochemical characteristics, oil samples taken from a number of wells are positively correlated to the source rock samples. Based on burial history modeling, the oil generation in the Basal Talang Akar Formation in this area began in the Early Miocene to the present. And in the Deltaic Talang Akar formation began in the Middle Miocene to the present. Keywords: Biomarker, Geochemistry, NWJ Basin, Petroleum, Source RockABSTRAKDaerah penelitian terletak di lepas pantai Jawa Barat Utara, Sub-Cekungan Ardjuna Tengah yang termasuk ke dalam wilayah opreasi PT. Pertamina Hulu Energi Abar. Penelitian ini difokuskan kepada batuan induk pada Formasi Talang Akar dan hidrokarbon yang terdapat pada daerah tersebut. Data yang digunakan dalam penelitian ini yaitu data geokimia batuan induk dan minyak bumi. Data batuan induk yang dievaluasi berasal dari sumur YZD-1, YY-1 dan DZN-1. Dari analisis batuan induk didapatkan bahwa batuan induk yang dapat menggenerasikan hidrokarbon terdapat pada sumur YZD-1 dan YY-1. Batuan induk tersebut didominasi oleh material organik kerogen tipe II-III dan III-II yang berasal dari material organik daratan yang bercampur dengan alga dan cenderung menghasilkan campuran minyak dan gas bumi. Material organik batuan induk di sumur YZD-1 pada interval kedalaman 8421.9-8450 kaki diendapkan di daerah danau dalam dengan kondisi oksik. Sedangkan pada material organic pada batuan induk di sumur YY-1 pada interval kedalaman 6898.92-6909 kaki diendapkan di daerah danau dangkal. Terdapat empat buah sampel minyak yaitu sampel CC-1 DST1, CC-1 DST3, FZE-1 DST1, dan FZE-1 DST2. Hasil analisis menunjukkan bahwa terdapat korelasi positif antara sampel-sampel tersebut dan menunjukkan bahwa sampel tersebut diendapkan pada lingkungan danau dalam dan danau dangkal dengan material organik campuran tumbuhan tingkat tinggi dan alga. Berdasarkan karakteristik geokimia, sampel minyak yang diambil dari sejumlah sumur tersebut berkorelasi positif dengan sampel batuan induk. Berdasarkan permodelan sejarah pemendaman diketahui generasi minyak pada Formasi Basal Talang Akar di area ini dimulai pada Miosen Awal hingga saat ini. Dan padaFormasi Deltaic Talang Akar di mulai pada Miosen Tengah hingga saat ini. Kata kunci: Batuan Induk, Biomarker, Geokimia, NWJ Basin, Petroleum

PENGEMBANGAN KAWASAN PERMUKIMAN DAN KAWASAN INDUSTRI BERDASARKAN KEMAMPUAN LAHAN SERTA FASIES VULKANIK KUARTER Suganda, Bombom Rachmat; Hutabarat, Johanes; Sulaksana, Nana; Hendarmawan, Hendarmawan
Bulletin of Scientific Contribution Vol 15, No 1 (2017): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (665.921 KB)

AbstrakGunung Gede Pangrango dan Gunung Salak merupakan gunung api strato yang terdapat di Sukabumi Bogor merupakan daerah yang subur sehingga kawasan budidaya pertanian yang sangat subur beralih fungsi menjadi kawasan budidaya permukiman serta industri. Karakteristik batuan, kemiringan lereng, bahaya geologi, potensi air tanah, tekstur tanah, drainase, kepekaan tanah terhadap erosi dan curah hujan merupakan suatu hal yang sangat penting dalam penentuan kesesuaian lahan yang akan mengatur tata guna lahan. pemanfaatan lahan sebagai kawasan budidaya sehingga harus diatur pemanfaatan lahannya sehingga tidak membahayakan bagi manusia serta menjaga keseimbangan alam. Gunung Salak daerah resapan terletak pada fasies medial dengan elevasi 600-900 meter di atas permukaan laut dan pada lereng Gunung Pangrango daerah resapan terletak pada fasies proksimal dengan elevasi 2058-21227 meter di atas permukaan laut.Kesesuaian lahan pada daerah lereng gunung api vulkanik di daerah penelitian meliputi wilayah limitasi di sekitar fasies sentral dan proksimal, kemudian wilayah kendala di sekitar ujung akhir fasies proksimal kemudian wilayah limitasi pada fasies medial serta pada ujung akhir medial merupakan wilayah kendala dan wilayah kemungkinan di sekitar fasies distal. Kata Kunci : gunungapi, pengembangan kawasan, kemampuan lahanabstract Cicurug area and Caringin located on the border of Sukabumi and Bogor in West Java. It is a part Mount Salak and Pangrango’s slopes, which is a volcano quarter a certainly fertile area for farming area. The very fertile farming area is then converted into residential and industrial area. Analysis of land capability in the form of rock characteristics, slope, geological hazards, water potential, soil texture, drainage, soil sensitivity to erosion and rainfall are very important in determining the suitability of land that would manage land use. Factors of natural hazards as well as water catchment areas is a limiting factor for land use as cultivated area that should be regulated so that the land use is not harmful to people as well as maintaining the balance of nature. Catchment areas in the region shows the slopes of Mount Salak catchment area lies in the medial facies with elevation of 600-900 meters above sea level and on the slopes of Mount Pangrango catchment areas located in the proximal facies with 2058-21227 meters elevation mean sea level.Key word : volcano, Area Development, Land capability

ESTIMASI TEMPERATUR BAWAH PERMUKAAN BERDASARKAN KEHADIRAN MINERAL ALTERASI PADA SUMUR “X” LAPANGAN PANAS BUMI WAYANG WINDU, PANGALENGAN, KABUPATEN BANDUNG, PROVINSI JAWA BARAT Oktaviany, Vina; Hutabarat, Johanes; Haryanto, Agus Didit
Buletin Sumber Daya Geologi Vol 12 No 2 (2017): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v12i2.39

Temperatur merupakan aspek penting dalam sistem panas bumi untuk pengembangan panas bumi sebagai sumber energi. Penelitian ini dimaksudkan untuk mengetahui jenis litologi, mineral alterasi, tipe dan intensitas alterasi serta penyebarannya pada sumur X, dan bertujuan menentukan temperatur berdasarkan geotermometer mineral yang kemudian dibandingkan dengan data hasil pengukuran temperatur (T) sumur. Objek dalam penelitian ini berupa serbuk bor (cutting) dari sumur X yang dianalisis dengan metode petrologi, petrografi, dan XRD. Hasilnya menunjukkan, bahwa litologi sumur X terdiri atas andesit terubah, tuf litik terubah, dan tuf kristal terubah. Mineral alterasi yang berkembang didominasi oleh mineral alterasi dengan pH netral yang berupa kuarsa sekunder, kalsit, epidot, montmorilonit, illit, smektit, klorit, oksida besi, dan pirit, serta beberapa mineral ber-pH asam seperti kaolinit, kristobalit, anhidrit, dan haloysit. Berdasarkan asosiasi mineralnya, alterasi pada sumur X dibagi menjadi tiga tipe, yaitu alterasi argilik dengan perkiraan temperatur antara 150oC hingga 180oC, alterasi subpropilitik antara 150oC s.d. 220oC, dan alterasi propilitik antara 210oC s.d. 280oC. Secara umum, hasil geotermometer mineral ini menunjukkan data temperatur yang lebih tinggi dibandingkan data T berdasarkan pengukuran sumur.

KARAKTERISTIK GEOKIMIA LEMPUNG DAN KUALITASNYA SEBAGAI PENJERNIH MINYAK SAWIT DI KABUPATEN SUKABUMI, JAWA BARAT Insan, Rachmatulloh; Hutabarat, Johanes; Haryanto, Agus Didit
Jurnal Teknologi Mineral dan Batubara Vol 20 No 3 (2024): Jurnal Teknologi Mineral dan Batubara Edisi September 2024
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/jtmb.Vol20.No3.2024.1597

Before palm oil can be consumed, it must be processed through several processes, one of them is purification. To obtain an oil colour corresponds to a certain quality, a bleaching process is required using a bleaching agent or bleaching earth (BE). Material of palm oil purifier is made from clay. Clay is often found in Sukabumi Regency, West Java Province in Jampang Formation Cikarang Member and Lengkong Formation. The purpose of this research is to obtain a geochemical description and to determine the chemical composition of clay minerals in Jampang Formation Cikarang Member and Lengkong Formation and its effect on surface area properties and bleaching performance. This research used five clay samples, three samples from Jampang Formation Cikarang Member and two sampels from Lengkong Formation. To obtain geochemical characteristics composition, each sample was analyzed using XRD, SEM and XRF methods, meanwhile, to obtain information on the quality of palm oil clarifier, surface spesific area of the clay was measured using SAA and the color index of the palm oil that had been filtered by each clay sample was measured using the Lovibond Tintometer. The results showed that there was correlation between montmorillonite content to surface area value and bleaching performance of the clay. The larger the surface area of the clay, the higher its bleaching ability for palm oil. In addition, the surface area of the clay is also related to its montmorillonite content. Clay samples with high surface area, namely sample FJ-1 with a surface area of 111.5 m²/g and FJ-2 with a surface area of 106.4 m²/g, have higher montmorillonite content, specifically 67.2 and 70.7% compared to samples FJ-3, FL-1, and FL-2, which have montmorillonite contents of 17.4%, 47.4%, and 32.9%. Therefore, to obtain high-quality clay as a bleaching earth (BE) for the palm oil industry, clay with a high montmorillonite mineral content should be used.

KARAKTERISTIK GEOKIMIA LEMPUNG DAN KUALITASNYA SEBAGAI PENJERNIH MINYAK SAWIT DI KABUPATEN SUKABUMI, JAWA BARAT Insan, Rachmatulloh; Hutabarat, Johanes; Haryanto, Agus Didit
Jurnal Teknologi Mineral dan Batubara Vol 20 No 3 (2024): Jurnal Teknologi Mineral dan Batubara Edisi September 2024
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/jtmb.Vol20.No3.2024.1597

Before palm oil can be consumed, it must be processed through several processes, one of them is purification. To obtain an oil colour corresponds to a certain quality, a bleaching process is required using a bleaching agent or bleaching earth (BE). Material of palm oil purifier is made from clay. Clay is often found in Sukabumi Regency, West Java Province in Jampang Formation Cikarang Member and Lengkong Formation. The purpose of this research is to obtain a geochemical description and to determine the chemical composition of clay minerals in Jampang Formation Cikarang Member and Lengkong Formation and its effect on surface area properties and bleaching performance. This research used five clay samples, three samples from Jampang Formation Cikarang Member and two sampels from Lengkong Formation. To obtain geochemical characteristics composition, each sample was analyzed using XRD, SEM and XRF methods, meanwhile, to obtain information on the quality of palm oil clarifier, surface spesific area of the clay was measured using SAA and the color index of the palm oil that had been filtered by each clay sample was measured using the Lovibond Tintometer. The results showed that there was correlation between montmorillonite content to surface area value and bleaching performance of the clay. The larger the surface area of the clay, the higher its bleaching ability for palm oil. In addition, the surface area of the clay is also related to its montmorillonite content. Clay samples with high surface area, namely sample FJ-1 with a surface area of 111.5 m²/g and FJ-2 with a surface area of 106.4 m²/g, have higher montmorillonite content, specifically 67.2 and 70.7% compared to samples FJ-3, FL-1, and FL-2, which have montmorillonite contents of 17.4%, 47.4%, and 32.9%. Therefore, to obtain high-quality clay as a bleaching earth (BE) for the palm oil industry, clay with a high montmorillonite mineral content should be used.

Stream Morphometry as Response to the Level of Tectonic Deformation on Sorowako and Surrounding Areas, Indonesia Sambodo, Tri Hananto; Sukiyah, Emi; Hutabarat, Johanes
Journal of Geoscience, Engineering, Environment, and Technology Vol. 10 No. 3 (2025): JGEET Vol 10 No 03 : September (2025)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2025.10.3.17977

Sorowako and surrounding areas are geologically influenced by Sulawesi’s microcontinent movement, which has produced several geological phenomena. Morphometry is one of the parameter that can reveal geological condition of particular area. Morphometric analysis of water catchment area in Sorowako and surrounding areas using Bifurcation Ratio (Rb) and Drainage Density (Dd) can provide comprehensive information on level of deformation in Sorowako region. Analysis result of Bifurcation Ratio Index (Rb) on water catchment area reveals that Rb<3 value is dominant and equally spread in Sorowako region, it varies from 0.094 to 2.888. However in several place the value of Bifurcation Ratio (Rb) index is more than 5 (Rb>5) with varies from 5.142 to 10.250. Drainage Density (Dd) value ranges from 0.907 to 8.422 with an average value is 4.125 describes impact of erosion and tectonic on Sorowako region. Based on morphometric analysis of two parameters, Sorowako and surroundings area have been heavily impacted by tectonic activity on Sulawesi island. In western, eastern and northern regions on water catchment area, level of deformation tends to be higher compared to southern region. This can be seen on analysis result of water catchment area 43, water catchment area 196, and water catchment area 302 that have relatively larger number of stream orders, and also have Bifurcation Ratio’s value less than three (Rb<3). Information of tectonic deformation level on Sorowako region through morphometric analysis is important to further use as a basis for water catchment area management planning, so that it can identify areas prone to geological disasters. This fairly high level of tectonic deformation also believed to be a controlling factor for nickel grade contained in Sorowako and surrounding areas which allow supergene enrichment to occurs in rocks.

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