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Cahyadi, Andhi
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Education Energy Engineering Environmental Science

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SEBARAN UNSUR DAN ASOSIASI UNSUR Fe LATERIT BESI DAERAH BLOK X, PT SILO, PULAU SEBUKU, KALIMANTAN SELATAN: ELEMENTAL DISTRIBUTION ANALYSIS AND ELEMENTAL ASSOCIATION OF Fe LATERITC IRON, BLOCK X AREA, PT SILO, SEBUKU ISLAND, SOUTH KALIMANTAN Andri B Situmorang; Suprapto, Sabtanto Joko; W, A. Djumarma; Widhiyatna, Denni; Mutia, Sarah; Cahyadi, Andhi
Buletin Sumber Daya Geologi Vol 19 No 1 (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.v19i1.475

Abstract

The study area is located in Blok X, PT SILO, Sebuku Island, South Kalimantan. The geology of the study area is dominated by serpentinized ultramafic rocks, which have a high potential for the formation of lateritic iron minerals. The aim of the investigation of the area was to determine the vertical and horizontal distribution of the element contents and the association of the iron elements. Drilling, sample analyses using XRF, petrography and statistical analyses of correlation matrices and dendrograms were carried out. Fe, Ni, P, Co, Si, Mg, Cr, Al, Mn, Ca, Na, K and Ti were analyzed in 5.150 samples using the XRF method. The high iron content is found in the red limonite zone with 40-55% and in the yellow limonite zone with 40-52%. The lithology of the area with high iron content is ophiolitic ultramafic rock. In the vertical distribution profile, the high iron content is also found in the red limonite - yellow limonite zone. Based on the dendrogram analysis and the correlation matrix, the correlation of the Fe elements in the study area shows that the Fe elements are strongly correlated with the Co, Cr and Mn elements and generally with the Ni elements. Elemental iron is strongly negatively correlated with the elements Si and Mg.
DERAJAT LATERITISASI DAN PENGAYAAN UNSUR FE-NI-CO PADA BATUAN HARSBURGIT DI PULAU SEBUKU, KALIMANTAN SELATAN: DEGREE OF LATERITIZATION AND ENRICHMENT OF FE-NI-CO ELEMENTS IN HARSBURGITE ROCKS ON SEBUKU ISLAND, SOUTH KALIMANTAN Fasya Zahra Fauziyyah Ramdani; Putri Ramadhani, Ayumi Hana; Cahyadi, Andhi; Ernowo; Widodo, Wahyu
Buletin Sumber Daya Geologi Vol 18 No 3 (2023): 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.v18i3.411

Abstract

The tropical climate in Indonesia causes a high level of chemical weathering or lateritization of ultramafic rocks which results in the enrichment of economic elements such as Fe, Ni and Co. These elements accumulate in the limonite and saprolite zones. This research was conducted on Sebuku Island which composed of ultramafic rocks, especially harzburgite. This study aims to determine the effect of the degree of lateritization in the limonite, saprolite and bedrock zones on the enrichment of economic elements. A number of 95 samples collected from 9 drill holes and analyzed using XRF to determine the main elements and economic elements. The degree of lateritization is calculated from the SiO2 content divided by the total accumulation of SiO2, Al2O3 and Fe2O3 resulting the S/SAF index which describes the intensity of the chemical reaction. The lowest value of the S/SAF index indicates a higher degree of lateritization. Each limonite, saprolite and bedrock zone has S/SAF index values ​​ranging from 0.16 to 58 (strong lateritization), 0.27 to 0.85 (medium lateritization-kaolinization) and 0.77 to 1.24 (mother rock). The zone with a strong degree of lateritization contains Fe levels between 36% to 51%, Ni 0.80% to 1.38% and Co 0.07% to 1.17%. The bedrock contains 4.86% to 7.99% Fe, 0.20% to 1.76% Ni and 0.005% to 0.015% Co. The degree of lateritization in the limonite zone is higher than the saprolite and bedrock zones. This is caused by the decomposition of silica minerals to form the iron and aluminum oxide-hydroxide bearing minerals. The degree of lateritization has a positive correlation with the enrichment of Fe and Co. However, the distribution of high Ni not correlated with the index of lateritization.
SEBARAN UNSUR DAN ASOSIASI UNSUR Fe LATERIT BESI DAERAH BLOK X, PT SILO, PULAU SEBUKU, KALIMANTAN SELATAN: ELEMENTAL DISTRIBUTION ANALYSIS AND ELEMENTAL ASSOCIATION OF Fe LATERITC IRON, BLOCK X AREA, PT SILO, SEBUKU ISLAND, SOUTH KALIMANTAN Andri B Situmorang; Situmorang, Andri B; Suprapto, Sabtanto Joko; W, A. Djumarma; Widhiyatna, Denni; Mutia, Sarah; Cahyadi, Andhi
Buletin Sumber Daya Geologi Vol 19 No 1 (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.v19i1.475

Abstract

The study area is located in Blok X, PT SILO, Sebuku Island, South Kalimantan. The geology of the study area is dominated by serpentinized ultramafic rocks, which have a high potential for the formation of lateritic iron minerals. The aim of the investigation of the area was to determine the vertical and horizontal distribution of the element contents and the association of the iron elements. Drilling, sample analyses using XRF, petrography and statistical analyses of correlation matrices and dendrograms were carried out. Fe, Ni, P, Co, Si, Mg, Cr, Al, Mn, Ca, Na, K and Ti were analyzed in 5.150 samples using the XRF method. The high iron content is found in the red limonite zone with 40-55% and in the yellow limonite zone with 40-52%. The lithology of the area with high iron content is ophiolitic ultramafic rock. In the vertical distribution profile, the high iron content is also found in the red limonite - yellow limonite zone. Based on the dendrogram analysis and the correlation matrix, the correlation of the Fe elements in the study area shows that the Fe elements are strongly correlated with the Co, Cr and Mn elements and generally with the Ni elements. Elemental iron is strongly negatively correlated with the elements Si and Mg.
Co-Authors Andri B Situmorang Ernowo Fasya Zahra Fauziyyah Ramdani Mutia, Sarah Putri Ramadhani, Ayumi Hana Sabtanto Joko Suprapto Situmorang, Andri B W, A. Djumarma Wahyu Widodo Widhiyatna, Denni