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Morphotectonics of Mount Rendingan Area Related To the Appearances of Geothermal Surface Manifestations Gentana, Dewi; Sulaksana, Nana; Sukiyah, Emi; Yuningsih, Euis Tintin
Indonesian Journal on Geoscience Vol 6, No 3 (2019)
Publisher : Geological Agency

DOI: 10.17014/ijog.6.3.291-309The researched area is situated at Mount Rendingan and its surrounding area, Lampung Province, the southern part of Sumatra Island. It has a big potential of geothermal resource in line with a unique graben like bowl landform and geothermal surface manifestations. This research was carried out using remote sensing and field observation methods. The remote sensing method used topography and Shuttle Radar Topography Mission -Digital Elevation Model (SRTM-DEM) maps to analyze morphotectonic attributes, and the result was validated by morphotectonic data analysis from field observation. The purpose of this research is to evaluate the relation between morphotectonic and the appearances of geothermal surface manifestations. The interpretation of SRTM-DEM and topographic maps are supported by morphotectonic analyses,which indicate that the geothermal surface manifestations in this area are controlled by tectonic activity. It has various levels of lift which are shown by the values of valley height weight ratio (Vf) from 0.16 to 3.31 and the values of mountain front sinuosity (Smf) from 1.05 to 2.09. The morphotectonic characteristics can describe the geological structure activity levels which are reflected in the landform and its rock. The volcanic areas consist of igneous rocks which have small primary permeabilities. However, the development of geological structure can cause fractures in the rock that step in as a medium for passing geothermal fluid from depth to surface. They are found on the fault intersection zone system trending NE-SW and NW-SE, NNE-SSW and NNW-SSE, and WE system directions that indicate the fault system is correlated with the appearances of geothermal manifestations.

The Determination of Volcanic Characteristics Based on Deuterium and Oxygen-18 Isotope Compositions: A Case Study at Dieng Plateau, Central Java Priatna, Priatna; Sulaksana, Nana; Hutabarat, Johanes; Haryanto, Iyan
Indonesian Journal on Geoscience Vol 7, No 2 (2020)
Publisher : Geological Agency

DOI:10.17014/ijog.7.2.201-213To find out volcanic characteristics, a geochemical approach can be used, one of which is through the measurement of deuterium and oxygen-18 isotopes from condensate and crater water samples. In this study, Dieng Plateau in Central Java was chosen, because it has a wide spread of fumarole fields and crater water. In addition, research in the Dieng Plateau is very useful in the management of geological-based tourism and geopark development in the future. Results of isotope analysis in Candradimuka Crater show the average number of isotope deuterium is Î´D â€“ 500/00 and isotope oxygen-18 is Î´18O â€“30/00 which produce the value of the mixing fraction of f 18O = 47.11%. This figure is the highest isotope number compared to other craters on the Dieng Plateau. The high value of the isotope-18 mixing fraction is supported by a strong plume from three vents in Candradimuka. Meanwhile, the results of crater water isotope tests obtained the highest results in Sikidang Crater with the value of the deuterium isotope is Î´D = â€“ 10.300/00 and the isotope oxygen-18 is Î´18O = 6.570/00 which are in the metamorphic water area from the mixing of magmatic processes with surface meteoric water. Based on the deuterium isotope approach with oxygen-18 crater water and fumarole condensate supported by subsurface temperature data, most of the Dieng Plateau has magmatic-hydrothermal characteristics, except Candradimuka Crater which belongs to the magmatic group.Â

The Evolution of Gajahmungkur Paleovolcano, Wonogiri, Central Java, as A Reference to Revize the Terminology of â€œOld Andesite Formationâ€ Syafri, Ildrem; Sudradjat, A.; Sulaksana, Nana; Hartono, G.
Indonesian Journal on Geoscience Vol 5, No 4 (2010)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.5.4.263-268

DOI:Â 10.17014/ijog.v5i4.109Gajahmungkur is a Tertiary paleovolcano located in Wonogiri Regency, Central Java. The volcanic product of this volcano are widely distributed and composed of important elements of the stratigraphic sequence in the Southern Mountain area. The volcanic products so far have been simply classified as â€œOld Andesite Formationâ€ which apparently is not in line with the stratigraphic code and the Indonesian Stratigraphic Code. The description of paleovolcano therefore might contribute to the revision of the â€œOld Andesite Formationâ€. The evolution of Gajahmungkur paleovolcano commenced with the formation of a submarine volcano, and then at the second phase a composite volcano emerged above sea level forming a volcano island. The third phase was the self destruction resulting in a formation of a caldera. Pumiceous components dominated the products. At the fourth phase, the activities began to decline producing more basaltic rocks. The statistical analysis of the interrelation between various physical properties of the clastic rocks leads to the identification of volcanic facies and the location of the paleovolcano vent.

Morphotectonics of Mount Rendingan Area Related To the Appearances of Geothermal Surface Manifestations Gentana, Dewi; Sulaksana, Nana; Sukiyah, Emi; Yuningsih, Euis Tintin
Indonesian Journal on Geoscience Vol 6, No 3 (2019)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.6.3.291-309

DOI: 10.17014/ijog.6.3.291-309The researched area is situated at Mount Rendingan and its surrounding area, Lampung Province, the southern part of Sumatra Island. It has a big potential of geothermal resource in line with a unique graben like bowl landform and geothermal surface manifestations. This research was carried out using remote sensing and field observation methods. The remote sensing method used topography and Shuttle Radar Topography Mission -Digital Elevation Model (SRTM-DEM) maps to analyze morphotectonic attributes, and the result was validated by morphotectonic data analysis from field observation. The purpose of this research is to evaluate the relation between morphotectonic and the appearances of geothermal surface manifestations. The interpretation of SRTM-DEM and topographic maps are supported by morphotectonic analyses,which indicate that the geothermal surface manifestations in this area are controlled by tectonic activity. It has various levels of lift which are shown by the values of valley height weight ratio (Vf) from 0.16 to 3.31 and the values of mountain front sinuosity (Smf) from 1.05 to 2.09. The morphotectonic characteristics can describe the geological structure activity levels which are reflected in the landform and its rock. The volcanic areas consist of igneous rocks which have small primary permeabilities. However, the development of geological structure can cause fractures in the rock that step in as a medium for passing geothermal fluid from depth to surface. They are found on the fault intersection zone system trending NE-SW and NW-SE, NNE-SSW and NNW-SSE, and WE system directions that indicate the fault system is correlated with the appearances of geothermal manifestations.

The Determination of Volcanic Characteristics Based on Deuterium and Oxygen-18 Isotope Compositions: A Case Study at Dieng Plateau, Central Java Priatna, Priatna; Sulaksana, Nana; Hutabarat, Johanes; Haryanto, Iyan
Indonesian Journal on Geoscience Vol 7, No 2 (2020)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.7.2.201-213

DOI:10.17014/ijog.7.2.201-213To find out volcanic characteristics, a geochemical approach can be used, one of which is through the measurement of deuterium and oxygen-18 isotopes from condensate and crater water samples. In this study, Dieng Plateau in Central Java was chosen, because it has a wide spread of fumarole fields and crater water. In addition, research in the Dieng Plateau is very useful in the management of geological-based tourism and geopark development in the future. Results of isotope analysis in Candradimuka Crater show the average number of isotope deuterium is Î´D â€“ 500/00 and isotope oxygen-18 is Î´18O â€“30/00 which produce the value of the mixing fraction of f 18O = 47.11%. This figure is the highest isotope number compared to other craters on the Dieng Plateau. The high value of the isotope-18 mixing fraction is supported by a strong plume from three vents in Candradimuka. Meanwhile, the results of crater water isotope tests obtained the highest results in Sikidang Crater with the value of the deuterium isotope is Î´D = â€“ 10.300/00 and the isotope oxygen-18 is Î´18O = 6.570/00 which are in the metamorphic water area from the mixing of magmatic processes with surface meteoric water. Based on the deuterium isotope approach with oxygen-18 crater water and fumarole condensate supported by subsurface temperature data, most of the Dieng Plateau has magmatic-hydrothermal characteristics, except Candradimuka Crater which belongs to the magmatic group.Â

Kesesuaian Lahan untuk Tanaman Kayu Putih sebagai Strategi Modifikasi Konservasi dan Kepentingan Nilai Tambah Ekonomi di Desa Cikembang, Kecamatan Kertasari, Kabupaten Bandung Priswantoro, Andis Andis; Sulaksana, Nana Nana; Endyana, Cipta Cipta; Tri Mursito, Anggoro Anggoro
Jurnal Teknologi Lingkungan Vol. 22 No. 1 (2021)
Publisher : Center for Environmental Technology - Agency for Assessment and Application of Technology

ABSTRACT Cikembang Village, Kertasari District, Bandung Regency, is located in the Upper Citarum Sub-watershed. Cikembang, one of the water catchment villages, is a conservation area with eucalyptus plants. Eucalyptus plants in the category of Fast-Growing Species (FGS) can accelerate the process of succession of critical lands, restoration of peat ecosystems, are very adaptive to cultivate with agroforestry systems, support food security. However, the implementation of eucalyptus plants in Cikembang Village needs to be analyzed its impact on the conservation function and the importance of economic value-added. This study aims to form a conservation modification strategy and the importance of added value to the economy of eucalyptus cultivation by taking into account land suitability and its limiting factors. The soil fertility level approach is promising for eucalyptus growth in three land locations, namely: wet soil/Tb, slope/Tk, soil near springs/Tm, with attributes of elevation, slope, rainfall, temperature, acidity, and soil organic matter. With the storie methodâ€™s assessment, the soil is in the N1 category (currently unsuitable), and the root square is produced while the soil is in the S3 category (slightly marginal). The strategy for obtaining land use to accommodate cropping patterns for conservation and agricultural interests is by applying the silvicultural system techniques (integrating plant species, environmental modification, making terraces, setting spacing, and managing fertilization maintenance, including pest control). The study also tried to accommodate the approach to producing eucalyptus leaves as raw material for eucalyptus oil processing becomes an economic added value by refining eucalyptus oil. Keywords:Â eucalyptus, strategy, modification, conservation, added value Â ABSTRAK Kawasan Desa Cikembang, Kecamatan Kertasari, Kabupaten Bandung, terletak di Sub DAS Citarum Hulu. Cikembang salah satu desa tangkapan air menjadi daerah konservasi dengan tanaman kayu putih. Tanaman kayu putih kategori fast growing species (FGS) dapat mempercepat proses suksesi lahan kritis, restorasi ekosistem gambut, sangat adaptif dibudidayakan dengan sistem agroforestri, mendukung ketahanan pangan. Namun demikian, implementasi tanaman kayu putih di Desa Cikembang perlu dianalisis dampaknya terhadap fungsi konservasi dan kepentingan nilai tambah ekonomi. Penelitian ini bertujuan untuk membentuk strategi modifikasi konservasi dan kepentingan nilai tambah ekonomi budidaya tanaman kayu putih dengan memperhatikan kesesuaian lahan dan faktor pembatasnya. Pendekatan tingkat kesuburan tanah cukup menjanjikan untuk pertumbuhan kayu putih di tiga lokasi lahan yaitu: tanah basah/Tb, tanah kemiringan/Tk, tanah dekat mata air/Tm, dengan atribut elevasi, lereng, curah hujan, suhu, dan keasaman serta organik tanah. Dengan menggunakan pendekatan metode storie, diketahui bahwa tanah Desa Cikembang termasuk ke dalam kategori N1 (saat ini tidak sesuai), dan dengan menggunakan metode root square, dihasilkan bahwa tanah termasuk kategori S3 (sedikit marginal). Strategi yang digunakan untuk memperoleh tata guna lahan yang mengakomodasi pola tanam untuk konservasi dan kepentingan pertanian adalah pendekatan aplikasi teknik sistem silvikultur (pemaduan elemen spesies tanaman, modifikasi lingkungan, pembuatan teras, pengaturan jarak tanam, pengaturan pemupukan, pemeliharaan, termasuk pengendalian hama) serta pendekatan produksi daun tanaman kayu putih sebagai bahan baku olahan minyak kayu putih menjadi nilai tambah ekonomi dengan penyulingan minyak kayu putih. Kata kunci: kayu putih, strategi, modifikasi, konservasi, nilai tambah

Kesesuaian Lahan untuk Tanaman Kayu Putih sebagai Strategi Modifikasi Konservasi dan Kepentingan Nilai Tambah Ekonomi di Desa Cikembang, Kecamatan Kertasari, Kabupaten Bandung Priswantoro, Andis Andis; Sulaksana, Nana Nana; Endyana, Cipta Cipta; Tri Mursito, Anggoro Anggoro
Jurnal Teknologi Lingkungan Vol. 22 No. 1 (2021)
Publisher : Center for Environmental Technology - Agency for Assessment and Application of Technology

ABSTRACT Cikembang Village, Kertasari District, Bandung Regency, is located in the Upper Citarum Sub-watershed. Cikembang, one of the water catchment villages, is a conservation area with eucalyptus plants. Eucalyptus plants in the category of Fast-Growing Species (FGS) can accelerate the process of succession of critical lands, restoration of peat ecosystems, are very adaptive to cultivate with agroforestry systems, support food security. However, the implementation of eucalyptus plants in Cikembang Village needs to be analyzed its impact on the conservation function and the importance of economic value-added. This study aims to form a conservation modification strategy and the importance of added value to the economy of eucalyptus cultivation by taking into account land suitability and its limiting factors. The soil fertility level approach is promising for eucalyptus growth in three land locations, namely: wet soil/Tb, slope/Tk, soil near springs/Tm, with attributes of elevation, slope, rainfall, temperature, acidity, and soil organic matter. With the storie methodâ€™s assessment, the soil is in the N1 category (currently unsuitable), and the root square is produced while the soil is in the S3 category (slightly marginal). The strategy for obtaining land use to accommodate cropping patterns for conservation and agricultural interests is by applying the silvicultural system techniques (integrating plant species, environmental modification, making terraces, setting spacing, and managing fertilization maintenance, including pest control). The study also tried to accommodate the approach to producing eucalyptus leaves as raw material for eucalyptus oil processing becomes an economic added value by refining eucalyptus oil. Keywords:Â eucalyptus, strategy, modification, conservation, added value Â ABSTRAK Kawasan Desa Cikembang, Kecamatan Kertasari, Kabupaten Bandung, terletak di Sub DAS Citarum Hulu. Cikembang salah satu desa tangkapan air menjadi daerah konservasi dengan tanaman kayu putih. Tanaman kayu putih kategori fast growing species (FGS) dapat mempercepat proses suksesi lahan kritis, restorasi ekosistem gambut, sangat adaptif dibudidayakan dengan sistem agroforestri, mendukung ketahanan pangan. Namun demikian, implementasi tanaman kayu putih di Desa Cikembang perlu dianalisis dampaknya terhadap fungsi konservasi dan kepentingan nilai tambah ekonomi. Penelitian ini bertujuan untuk membentuk strategi modifikasi konservasi dan kepentingan nilai tambah ekonomi budidaya tanaman kayu putih dengan memperhatikan kesesuaian lahan dan faktor pembatasnya. Pendekatan tingkat kesuburan tanah cukup menjanjikan untuk pertumbuhan kayu putih di tiga lokasi lahan yaitu: tanah basah/Tb, tanah kemiringan/Tk, tanah dekat mata air/Tm, dengan atribut elevasi, lereng, curah hujan, suhu, dan keasaman serta organik tanah. Dengan menggunakan pendekatan metode storie, diketahui bahwa tanah Desa Cikembang termasuk ke dalam kategori N1 (saat ini tidak sesuai), dan dengan menggunakan metode root square, dihasilkan bahwa tanah termasuk kategori S3 (sedikit marginal). Strategi yang digunakan untuk memperoleh tata guna lahan yang mengakomodasi pola tanam untuk konservasi dan kepentingan pertanian adalah pendekatan aplikasi teknik sistem silvikultur (pemaduan elemen spesies tanaman, modifikasi lingkungan, pembuatan teras, pengaturan jarak tanam, pengaturan pemupukan, pemeliharaan, termasuk pengendalian hama) serta pendekatan produksi daun tanaman kayu putih sebagai bahan baku olahan minyak kayu putih menjadi nilai tambah ekonomi dengan penyulingan minyak kayu putih. Kata kunci: kayu putih, strategi, modifikasi, konservasi, nilai tambah

Hydrochemistry and Characteristics of Groundwater: Case Study Water Contamination at Citarum River Upstream Mohamad Sapari Dwi Hadian; T Yan Waliana; Nana Sulaksana; Dewandra Bagus Eka Putra; Yuniarti Yuskar
Journal of Geoscience, Engineering, Environment, and Technology Vol. 2 No. 4 (2017): JGEET Vol 02 No 04 : December (2017)
Publisher : UIR PRESS

Rancaekek and Sayang area, West Java, are the area where many industrial factories are located.Thus, the region becomes the targeted destination for industrial development.The population in the area is rising due to the growth of industries causing the regional development becomes uncontrollable. In addition, the constant increment of waste and also poor-coordinated disposal systems may result in groundwater contamination in the areas. The rapid growth of the area increase the need for groundwater as well as the need for more research about contamination at Rancaekek and Sayang. The research aims to explore the spread of groundwater contamination in the area. The research method is carried out based on the analysis of Geological Mapping, Hydrogeological Mapping and chemical characteristics of the groundwater in the area. Chemical analyses of the groundwater were conducted through laboratory test of groundwater samples at specific spots of dug wells. The lab test results were further analyzed to determine the contamination zone. The findings reveal that the distribution of contamination in the area follow the shallow ground water flow patterns, the water contamination contains heavy metal and there is degradation of soil fertility. The findings suggest the stakeholders to delineate the contaminated area, and increase the dissemination of environmental awareness.

Gold mineralization in the Neo-Tectonic Region of Honje Formation and Cipacar Formation Dudi Nasrudin Usman; Nana Sulaksana; Febri Hirnawan; Iyan Haryanto
Journal of Geoscience, Engineering, Environment, and Technology Vol. 3 No. 4 (2018): JGEET Vol 03 No 04 : December (2018)
Publisher : UIR PRESS

The gold ore mineralization region is a zone of mineralization which is inseparable from the role of geological structures, one of which is fracture. The Cibaliung and surrounding areas are epithermal gold mineralization zones, in this region there are two main mineralized zones, namely Cibitung Zone and Cikoneng Zone. It has almost the same characteristics where the fractures formed are quite large so that it influences the class of rock mass, but the other side is the presence of many fractures which make it easier for scattered mineralization to fill the fracture so that the formed vein is thick enough. This study aims to analyze the relationship of Rock Mass Rating (RMR) and Rocks Quality Design (RQD) to tectonic movements in the region to prove the neo-tectonic phenomena in the Honje Formation and Cipacar Formation using surface mapping methods. The methods used are rock type mapping, rock structure mapping, mapping and RQD measurements, rock descriptions and rock sample collection. All the data obtained are then verified and validated before processing and statistical tests. Statistical tests are carried out to ensure an analysis with a basis that is recognized by all parties. Both formations above have different ages, which is for the Honje Formation (Andesite Lava) with the final Miocene age and Cipacar Formation (tuff) at the age of Pleistocene. The findings of this study are the two formations measured by RQD and RMR on rock cracks and surrounding conditions; the RMR observation station made around 125 points in the Honje Formation and 117 points in the Cipacar Formation. The R2 value of the RMR value of the Honje Formation and the Cipacar Formation shows a positive relationship of 67%; The biggest RMR value is in Tuff rock. In addition, the relation between RMR Andesite Lava Value and RMR Tuff Value is done with T-Test between Andesite Lava and Tuff where the result shows no difference of mean between RMR Andesite Lava and RMR Tuff Value. Therefore, the tectonic processes that occur in the Honor Andesite Lava Unit of Honje Formation with the preceding position are formed, and the older age at the end of the Miocene age that is blocked by the field of unconformity experienced Continuity on Cipacar Formation Tuff Unit with the upper position that is formed after Honje Formation and younger age in Pleistocene. The continuation of the tectonic process proves the existence of active tectonic activity better known as Neo-tectonic.

Pemodelan Aliran Awanpanas (Aliran Piroklastik) Sebagai Data Pendukung Peta Kawasan Rawan Bencana Gunungapi (Studi Kasus Gunungapi Sinabung Sumatra Utara) Pyroclastic Flows Modeling as a Supporting Data for Volcanic Hazard Map (case study Sinabung Volcano-North Sumatra) Agoes Loeqman; Nana Sulaksana; Helman Hamdani; Wening Sulistri
Jurnal Lingkungan dan Bencana Geologi Vol 8, No 1 (2017)
Publisher : Badan Geologi

ABSTRAK Indonesia mempunyai 127 gunungapi aktif dan berdasarkan sejarah erupsi 67 di antaranya merupakan gunungapi berbahaya. Erupsi gunungapi memiliki risiko merusak dan mematikan tidak hanya bagi masyarakat yang bermukim disekitarnya tapi juga menyebabkan bencana bagi masyarakat luas. Salah satu bahaya primer erupsi gunungapi adalah aliran awanpanas, produk erupsi gunungapi yang sampai saat ini paling banyak menyebabkan jatuhnya korban jiwa, untuk itu diperlukan suatu simulasi/pemodelan untuk mengetahui pola aliran awanpanas guna mendukung penentuan Kawasan Rawan Bencana (KRB) erupsi gunungapi. Simulasi/pemodelan aliran awanpanas ini dibuat berdasarkan data Model Elevasi Digital (DEM) dan memanfaatkan aplikasi Sistem Informasi Geografis (GIS), dengan output berupa representasi dinamis dari kecepatan aliran awanpanas, ketebalan deposit, dan daerah terdampak, dengan studi kasus Gunungapi Sinabung Sumatera Utara. Setelah erupsi terakhir 1200 tahun lalu (sutawidjaja, 2013), peningkatan aktivitas Gunungapi sinabung ditandai dengan terjadinya letusan freatik pada periode Agustus-September 2010. Setelah 3 tahun beristirahat, aktivitas erupsi kembali terjadi sejak September 2013 hingga saat ini. Aktivitas erupsi berupa pertumbuhan kubah lava dan luncuran awanpanas telah mengakibatkan jatuhnya korban jiwa serta memaksa penduduk mengungsi menjauhi daerah bahaya. Simulasi/pemodelan aliran awanpanas Gunungapi Sinabung karena runtuhnya kubah lava dibuat ke berbagai arah dengan skenario volume kubah lava ; 1, 2 dan 3 juta m3 . Hasil overlay antara daerah landaan awanpanas dengan skenario 3 juta m3 pada Peta KRB menunjukan jangkauan aliran awanpanas pada sektor tenggara, barat dan timurlaut telah sedikit melewati batas KRB III (kawasan sangat berpotensi terlanda awan panas, aliran lava, guguran lava dan gas beracun). Kata kunci : awanpanas, Simulasi/model, titan2d, KRB ABSTRACT Indonesia has 127 active volcanoes and based on historical eruption, 67 of them are dangerous. Volcano eruption having destructive risk and deadly, not only for the people who lived around, but also caused disaster for large society. One of the primary danger of volcano eruption is the pyroclastic flow, volcano eruption products that until recently was the most caused the loss of life, therefore necessary creating a simulation/modeling to know pyroclastic flow pattern to support of a determination the Volcanic hazard map. Pyroclastic flow Simulation/modeling is made based on the Digital Elevation Model (DEM) data and using Geographical Information System (GIS) application, with output of representation dynamic from the pyroclastic flow velocity, the thickness of deposit, and affected areas, with case Sinabung Volcano in North Sumatra. Since lates eruption about 1.200 years ago, Increased activity Sinabung volcano started by phreatic eruptions during August – September 2010. After three years of rest, eruption activity occurs again on September 2013 until today, with lava dome growth and pyroclastic flow acitvity have caused casualties and forcing residents were being evacuated away from the danger area. The pyroclastic flow simulation/modeling due the lava dome collapse is made into various directions with scenario of lava dome volume ; 1, 2 and 3 million m3 . The results of overlay between areas affected by pyroclastic flow model with scenario 3 million m3 and volcanic hazard map showed the range of pyroclastic flow to the southeast, west and northeast sector reached the limit of zone III at volcanic hazard map (Very potentially affected by pyroclastic flow, lava flow, lava avalanche, and toxic volcanic gas ). Keywords : pyroclastic, simulation/modeling Titan2D, volcanic hazard map

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