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IDENTIFIKASI KANDUNGAN LITIUM PADA BATUAN FILIT KOMPLEKS LUK ULO, JAWA TENGAH: LITHIUM IDENTIFICATION ON PHYLLITE FROM THE LUK ULO COMPLEX, CENTRAL JAVA Isyqi; Setiawan, Nugroho Imam; Anggara, Ferian
Buletin Sumber Daya Geologi Vol 19 No 2 (2024): 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.v19i2.470

Production of lithium-ion batteries in Indonesia will be more feasible if Indonesia has its own lithium resources. Metapelitic rocks have the potential to serve as an alternate raw material for lithium. Phyllite, a type of metapelitic rock, was found in the Luk Ulo Complex, Central Java. The objective of this study is to determine the mineral composition and lithium concentration of the phyllite rocks from the Luk Ulo Complex. This will serve as a representative model for understanding the occurrence of lithium in similar rock types. The techniques employed to accomplish this objective include field surveys, petrographic, XRD, and ICP-AES/MS analysis. Phyllite in the Luk Ulo Complex is found in several locations and exhibits well-developed schistosity, characterized by a predominant mineral composition of quartz, graphite, chlorite, and white mica. The concentration of lithium in the phyllite from the Luk Ulo Complex exceeds the average concentration of lithium in the earth's crust, which typically ranges from 18.2 to 84.7 ppm. The presence of lithium in the phyllite rock is believed to be associated with the white mica minerals in the rock because the principal component analysis reveals a significant correlation between the lithium level in phyllite and the major elements K2O, CaO, Na2O, MgO, and Al2O3, which are responsible for the formation of the white mica. The phyllite rocks in the Luk Ulo Complex have a lithium enrichment that is five times more than the concentration of lithium in the earth's crust. It is believed that this enrichment is generated from the protoliths of the phyllite rocks, which are pelitic sedimentary rocks of continental origin. The presence of lithium in the phyllite rocks of the Luk Ulo Complex makes them suitable as lithium sources. However, due to their location within the Karangsambung Geological Reserve Area, these rocks are not to be exploited.

Geologi Daerah Iha – Luhu, Kecamatan Huamual, Kabupaten Seram Bagian Barat, Provinsi Maluku Samalehu, Herfien; Idrus, Arifudin; Setiawan, Nugroho Imam
Jurnal Geologi dan Sumberdaya Mineral Vol. 26 No. 3 (2025): JURNAL GEOLOGI DAN SUMBERDAYA MINERAL
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v26i3.941

Daerah Iha – Luhu terletak di Provinsi Maluku tepatnya pada wilayah Kecamatan Huamual Kabupaten Seram Bagian Barat. Wilayah penyelidikan berada pada koordinat 128o0’35” s.d 128o02’42” Bujur Timur dan 3o20’40” – 3o22’05” Lintang Selatan. Tujuan dilakukannya pemetaan geologi pada wilayah ini adalah untuk mendapatkan keadaan geologi wilayah penelitian khususnya menyangkut kondisi geomorfologi, stratigrafi serta struktur geologi. Metodologi penelitian menggunakan studi literatur, penelitian lapangan, analisa laboratorium serta menggunakan peta Digital Elevation Model (DEM). Berdasarkan kegiatan penelitian bahwa kondisi geomorfologi di wilayah penelitian mencakup dua satuan morfologi yang terdiri dari satuan dataran rendah dan satuan perbukitan rendah berlereng sangat landai – curam. Tatanan stratigrafi di Iha – Luhu terbagi menjadi tiga satuan dimana terdiri atas satuan filit kuarsa - muskovit, satuan metabatupasir kuarsa – muskovit, dan endapan aluvium. Struktur geologi yang berkembang merupakan lipatan antiklin di utara timur laut Bukit Tembaga. Hal ini ditunjukkan dengan kemiringan foliasi batuan sebesar 25o - 64o yang berarah timur laut – barat daya dengan sudut kemiringan landai - curam. Secara umum struktur sesar dan liniasi yang berarah timur laut – barat daya dan tenggara – barat laut terbentuk pada periode waktu yang sama. Kata kunci: Iha - Luhu, pemetaan geologi, geomorfologi, stratigrafi, struktur geologi. Abstract Iha – Luhu area is located in Maluku Province, precisely in the Huamual District, Western Seram Regency. Geographically, it is occupied at coordinates 128o0’35” to 128o02’42” East Longitude and 3o20’40” – 3o22’05” South Latitude. The purpose of geological mapping in this area is to obtain geological conditions of the research area regarding geomorphological conditions, stratigraphy and geological structures. The research methodology used literature studies, field research, laboratory analysis and a Digital Elevation Model (DEM) map. Based on research activities, the geomorphological conditions in the research area include two morphological units consisting of lowland units and low hill units with very gentle to steep slopes. The stratigraphic unit in Iha – Luhu is divided into three units consisting of quartz – muscovite meta-sandstone units, quartz – muscovite phyllite units and alluvium. The geological structure that developed in this area is an anticline fold in the northeast of Bukit Tembaga. This is indicated by a 25o– 64o slope of rock foliation that trends northeast-southwest with a gentle to steep slope angle. In general, fault structure and lineation trending NE-SW and SE-NW are formed in the same time period.Keywords: Iha – Luhu, geological mapping, geomorphology, stratigraphy, geology structure. Keywords: Iha – Luhu, geological mapping, geomorphology, stratigraphy, geology structure.

A MINERALOGY AND CHLORITE CHEMISTRY CONSTRAINTS ON THE FORMATION CONDITION OF PROPYLITIC ALTERATION IN THE TUJUH BUKIT PORPHYRY DEPOSIT, EAST JAVA, INDONESIA Por, Vannak; Idrus, Arifudin; Setiawan, Nugroho Imam; Takahashi, Ryohei; Takahashi, Ran; Abrar, Miftahul
INTAN Jurnal Penelitian Tambang Vol. 8 No. 2 (2025): INTAN: Jurnal Penelitian Tambang
Publisher : Program Studi S1 Teknik Pertambangan Fakultas Teknik Pertambangan dan Perminyakan Universitas Papua

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56139/intan.v8i2.314

Propylitic alteration develops chlorite, epidote, and calcite assemblages commonly found in porphyry copper–gold deposits. This study aims to understand the formation temperature, oxygen, and sulfur fugacity of chlorite, a characteristic central element of propylitic-related minerals such as epidote and calcite, using a combination of qualitative and quantitative experimental methods. The propylitic alteration forming condition was analyzed in detail using a superprobe (JXA-iSP100) and Electron Probe Micro Analysis (EPMA) at a voltage of 15.0 kV. The chlorite composition is relatively homogeneous, and displayed as Mg-rich chlorite (Type-I) within AlIV-Mg-Fe, ripidolite with respect to Si vs Fe/(Fe+Mg). The chlorite geothermometer indicates that the crystallizing temperature ranges from 288.30 to 332.82°C. The oxygen and sulfur fugacity log fO2 and log fS2 of chlorite are low ranges (– 70.4 to – 51.85) and (– 32.55 to – 20.65), respectively. The analyses identify the mineral as true epidote, with spatial variations indicating Fe occurs as Fe³⁺ and Mn as Mn²⁺. However, the examined proportion of moles of the significant elements (Mg, Ca, Fe, Mn) indicates that calcite is present in hydrothermal systems.

IDENTIFIKASI KANDUNGAN LITIUM PADA BATUAN FILIT KOMPLEKS LUK ULO, JAWA TENGAH: LITHIUM IDENTIFICATION ON PHYLLITE FROM THE LUK ULO COMPLEX, CENTRAL JAVA Isyqi; Setiawan, Nugroho Imam; Anggara, Ferian
Buletin Sumber Daya Geologi Vol 19 No 2 (2024): 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.v19i2.470

Production of lithium-ion batteries in Indonesia will be more feasible if Indonesia has its own lithium resources. Metapelitic rocks have the potential to serve as an alternate raw material for lithium. Phyllite, a type of metapelitic rock, was found in the Luk Ulo Complex, Central Java. The objective of this study is to determine the mineral composition and lithium concentration of the phyllite rocks from the Luk Ulo Complex. This will serve as a representative model for understanding the occurrence of lithium in similar rock types. The techniques employed to accomplish this objective include field surveys, petrographic, XRD, and ICP-AES/MS analysis. Phyllite in the Luk Ulo Complex is found in several locations and exhibits well-developed schistosity, characterized by a predominant mineral composition of quartz, graphite, chlorite, and white mica. The concentration of lithium in the phyllite from the Luk Ulo Complex exceeds the average concentration of lithium in the earth's crust, which typically ranges from 18.2 to 84.7 ppm. The presence of lithium in the phyllite rock is believed to be associated with the white mica minerals in the rock because the principal component analysis reveals a significant correlation between the lithium level in phyllite and the major elements K2O, CaO, Na2O, MgO, and Al2O3, which are responsible for the formation of the white mica. The phyllite rocks in the Luk Ulo Complex have a lithium enrichment that is five times more than the concentration of lithium in the earth's crust. It is believed that this enrichment is generated from the protoliths of the phyllite rocks, which are pelitic sedimentary rocks of continental origin. The presence of lithium in the phyllite rocks of the Luk Ulo Complex makes them suitable as lithium sources. However, due to their location within the Karangsambung Geological Reserve Area, these rocks are not to be exploited.

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