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All Journal Techno LPPM Journal of Engineering and Scientific Research (JESR) Jurnal Geosaintek
Sutarto Sutarto
Universitas Pembangunan Nasional Veteran Yogyakarta
Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Engineering Industrial & Manufacturing Engineering

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Geology And The Effect Of Boulder Size Concretion To Bauxite Laterite Deposit Quality At Djanra Area, Sandai District, Ketapang Regency, West Kalimantan Sutarto Sutarto; Agus Harjanto; Paschalis Pindyka Aji Kurniawan
Techno LPPM Vol 8, No 2 (2022)
Publisher : Universitas Pembangunan Nasional Veteran Yogayakarta

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Abstract

The research area is located in Djanra areas Sandai District, Ketapang Regency, West Kalimantan. The research methods used are surface geological mapping, bauxite sample collection, also studio and laboratory analysis. Laboratory analysis includes petrographic analysis, XRF, and wet analysis. The geomorphology of the study area is dominated by denudational and anthropogenic landforms as a result of mining activities. The constituent rocks are Kerabai andesite units which are Middle-Late Cretaceous and are intruded by Sukadana trachyte units which are of Late Cretaceous period. The geological structures found are a shear joint with the main southwest-northeast direction and the normal right slip fault. Bauxite laterite deposits in the research area have varying overburden and ore thicknesses. Distribution of concretion size of boulder to depth in the study area varies. Based on the results of the study, the boulder size concretion can affect the quality of bauxite laterite deposits. Where on DJANRA-1 hill is declared feasible to be taken and mixed with smaller concretions because it meets quality standards.
An Identification of Porphyry Deposit Based On Time Domain Induced Polarization Data Analysis in The Papua Region Y Yatini; Gilvandro Rumahorbo; Sutarto Sutarto
Journal of Engineering and Scientific Research Vol. 5 No. 1 (2023)
Publisher : Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jesr.v5i1.118

Abstract

Papua is one of the islands in Indonesia which has an abundance of economic metal mineralization in Indonesia. The types of mineralized deposits on the island of Papua are porphyry, skarn and epithermal, where porphyry deposits are identified in the study area, which were identified early by geological conditions. The geophysical approach is carried out using Time Domain Induced Polarization data analysis, TDIP measurements are carried out on an area of 2.24km2, with a total of 3 line oriented southeast-northwest along 3 km. Based on TDIP data analysis, there’s low resistivity anomaly correlates with high chargeability which is interpreted as a Potassic body at an elevation of 500m, while above it there are Serisitic-Clay-Chlorite and Serisitic-Clay-Pyrite alterations with high metal sulfide content up to 1100m elevation.
NEOTEKTONIK SEGMEN MOA BERDASARKAN DATA PALEOMAGNETIK DAN IMPLIKASI GERAK MIKROBLOK PADA ZONA SESAR PALU KORO Muhammad Rusli Muin; Sutarto Sutarto; Carolus Prasetyadi; Suharsono Suharsono
Jurnal Geosaintek Vol. 11 No. 2 (2025)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25023659.v11i2.7114

Abstract

Analisis paleomagnetik pada Segmen Moa Zona Sesar Palu-Koro (ZSPK), dilakukan dengan mengalisis 17 specimen batuan granitoid. Hasil yang diperoleh menunjukkan arah NRM yang memiliki deklinasi (Dm) 205,9° dan inklinasi (Im) –76,3°, dengan posisi kutub purba pada 56,0° LS dan 151,6° BT. Dibandingkan dengan kutub purba Lempeng Australia pada 3,35 juta tahun lalu, diperoleh rotasi (clockwise/CW) sebesar ±176° dan perpindahan spasial sekitar 1650 km ke arah barat laut, dengan estimasi perpindahan sebesar ±0,49 mm/tahun. Rotasi ekstrem dan translasi lambat ini menunjukkan bahwa Segmen Moa merupakan blok mikro tektonik yang mengalami deformasi signifikan sejak akhir Pliosen. Interpretasi ini konsisten dengan model fragmentasi lempeng oleh Hall (2002, 2012) serta data paleomagnetik regional (Ali & Hall, 1995; Mubroto, 1994, 1996), yang menunjukkan rotasi dan migrasi blok di Sulawesi akibat tumbukan oblique dan rollback slab. Hasil ini mengindikasikan bahwa Segmen Moa berasosiasi kuat dengan dinamika Lempeng Australia dan berperan aktif dalam evolusi tektonik kompleks di wilayah Indonesia bagian timur.
Co-Authors Agus Harjanto Carolus Prasetyadi Gilvandro Rumahorbo Muhammad Rusli Muin Paschalis Pindyka Aji Kurniawan Suharsono Suharsono Y Yatini