ABSTRAK Zeolit dijumpai pada batuan piroklastik di daerah Cikembar (Sukabumi) dan Bayah (Banten) dari zona fisiografi pegunungan Bogor dan Bayah. Karakteristik, genesa batuan, dan tipe zeolit di kedua lokasi tersebut belum dijelaskan, terutama kaitannya dengan potensi pengkayaan unsur tanah jarang (UTJ) pada batupasir tufan di daerah Cikembar dan tuf teralterasi di daerah Swakan. Metode yang digunakan pada studi ini terdiri dari pengamatan geologi lapangan, petrografi, difraksi sinar-X (XRD), dan kimia batuan (whole rock) menggunakan XRF dan ICP-MS. Tujuannya adalah untuk mengungkap genesa pembentukkan zeolit dan UTJ di Swakan dan Cikembar. Batupasir tufan dari Cikembar dan tuf dari Swakan menunjukkan kehadiran zeolit bertipe mordenit dan klinoptilolit. Zeolit di daerah Cikembar terdapat sejajar perlapisan, sedangkan di daerah Swakan berasosiasi dengan kumpulan mineral alterasi. Pengendapan zeolit Cikembar dipengaruhi oleh air meteorik yang dicirikan oleh anomali negatif Ce pada pola diagram laba-laba yang di normalisasi terhadap kondrit. Total (∑UTJ) pada batupasir tufan dari Cikembar 82-94 ppm dan pada tuf Swakan 71-83 ppm. Perbedaan kandungan ∑UTJ tersebut lebih mencerminkan komposisi UTJ pada batuan asal. Kata kunci: zeolit, Jawa Barat, mordenit dan klinoptilolit, unsur tanah jarang (UTJ) ABSTRACT -Geology and petrochemistry of zeolite deposits of Bayah and Sukabumi areas. Zeolites are found in pyroclastic rocks in Cikembar (Sukabumi) and Bayah (Banten) from the Bogor and Bayah mountainous physiographic zones. The characteristics, rock genesis, and types of zeolites from these two locations have not been explained, especially in relation to the potential of REEs (Rare Earth Elements) enrichment in Cikembar tuffaceous sandstone and Swakan altered tuff. The method used in this study consists of field geological observations, petrography, Xray diffraction (XRD), and whole rock geochemistry using XRF and ICP-MS. The aim is to uncover the formation of zeolites and REEs in Swakan and Cikembar.The Cikembar tuffaceous sandstones and the Swakan tuffs show the presence of mordenite and clinoptilolite types of zeolites minerals. The zeolites in Cikembar area are parallel to the bedding plane, while in Swakan area are associated with alteration mineral assemblages. The deposition of Cikembar zeolite was influenced by meteoric water which is characterized by the negative Ce anomalies in chondrite-normalized spider diagram pattern. The total (∑REEs) concentration in Cikembar tuffaceous sandstones are 82-94 ppm and Swakan tuffs are 71-83 ppm. The difference in the ∑REE content more likely reflects the parent's rock REEs composition.
In West Lampung, Sumatra, Indonesia, tropical volcanic residual soils are formed from weathering of volcanic breccias in hydrothermal alteration areas with a thickness of up to 20 m. This soil has the characteristics of clayey silt, low to high plasticity, brownish-red color, has the potential to swelling, easily eroded, and slide when it is saturated, and contains the minerals kaolinite, halloysite, illite, dickite, nacrite, montmorillonite, despujolsite, hematite, and magnetite. The results showed that this soil can cause corrosion of steel and is widely used by the community as a medium for growing plants and vegetables and as a foundation for infrastructure (for example, houses). The volcanic residual soil of the research area had Low Rare Earth Element (LREE) potential and specific uses. The soil with characteristic low plasticity has Liquid Limit (LL) brine value <50% will be suitable for agriculture purposes, building foundations, and earth construction. At the same time, the other category is soil with intermediate to high plasticity characteristics, which has an Liquid Limit (LL) brine value >50%, was more ideal for the primary forest.
ABSTRAKTanah residu vulkanik jalur transek Liwa-Bukit Kemuning, Lampung Barat dijadikan objek penelitian dengan tujuan untuk mengetahui karakteristik mineral lempung yang terkandung. Analisis SEM dan XRD dilakukan terhadap lima sampel tanah permukaan. Berdasarkan kedua analisis tersebut mineral lempung yang hadir adalah kaolinite, illite, dan halloysite. Kaolinite memiliki karakteristik triklin, melembar dan berlapis. Illite memiliki karakteristik lembaran-lembaran menekuk dan menyerat. Sedangkan halloysite hanya hadir di analisis XRD.Kata kunci: Liwa, mineral lempung, SEM dan XRD. ABSTRACT Volcanic residual soil of Liwa-Bukit Kemuning transect road West Lampung were studied in order to know the characteristic of clay minerals. SEM (Scanning Electron Microscopy) and XRD (X-Ray
Increased lightning intensity generally causes an increase in the level of hazards such as infrastructure damage and death. To mitigate these hazards, research is necessary. Research developments can be seen from the various literature published in journals or books. This study aimed to quantitatively assess the development of research on lightning protection, grounding systems, and soil resistivity. The bibliometric method is used by searching based on keywords in the Scopus basis data, then visualizing it using VOSviewer. The results showed that the total identified publications were 706 publications all years, the first publication in 1967 and the highest in 2014-2020 with 481 publications (68.1%). The countries that dominate are China and Brazil. Universidade Federal de Minas Gerais was the most productive institution, while Silverio Visacro was the most productive writer. Engineering and energy are the most widely written subjects, while topics related to multidisciplinary are still rare (0.2%). Electric Power Systems Research Journal is the top journal that publishes this research topic. The publication progress map based on co-occurrences consists of 9 clusters. The few research topics include electrical safety, substation, and backfill materials, while current topics include towers, wind turbines, bentonite, natural enhancement materials, and electromagnetic models. ABSTRAKPeningkatan intensitas petir umumnya menyebabkan peningkatan level bahaya seperti kerusakan infrastruktur dan kematian. Untuk memitigasi bahaya tersebut, perlu dilakukan riset. Perkembangan riset dapat dilihat dari berbagai literatur yang diterbitkan pada jurnal atau buku. Studi ini bertujuan untuk menilai secara kuantitatif perkembangan riset tentang proteksi petir, sistem pentanahan dan resistivitas tanah. Metode yang digunakan yaitu metode bibliometrik dengan melakukan penelusuran berdasarkan kata kunci pada basis data Scopus, kemudian divisualisasi menggunakan VOSviewer. Hasil penelitian menunjukkan bahwa total publikasi teridentifikasi 706 publikasi semua tahun, publikasi pertama tahun 1967 dan tertinggi tahun 2014-2020 dengan 481 publikasi (68,1%). Negara yang mendominasi yaitu China dan Brazil. Universidade Federal de Minas Gerais merupakan lembaga paling produktif mempublikasikan topik penelitian ini, sedangkan Silverio Visacro menjadi penulis terproduktif. Engineering dan energy menjadi subjek paling banyak ditulis, sedangkan topik yang berkaitan dengan multidisciplinary masih jarang dijumpai (0,2%). Electric Power Systems Research Journal merupakan jurnal teratas yang mempublikasikan topik penelitian ini. Peta perkembangan publikasi berdasarkan co-occurrences terdiri dari 9 klaster. Topik riset yang masih sedikit diantaranya yaitu substation, electrical safety, dan backfill material, sedangkan topik terkini diantaranya tower, wind turbine, bentonite, natural enhancement material, dan electromagnetic model.
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