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Program Studi Teknik Geologi Lt. 2 Gedung Fakultas Matematika dan Ilmu Pengetahuan Alam Kampus Hijau Bumi Tridharma Universitas Halu Oleo, Anduonohu, Kendari, 93232
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OPHIOLITE : Jurnal Geologi Terapan
Published by Universitas Halu Oleo
ISSN : -     EISSN : 27154440     DOI : https://doi.org/10.56099/ophi.
Core Subject : Science, Engineering,
Earth & Planetary Sciences Engineering
OPHIOLITE: Jurnal Geologi Terapan adalah terbitan berkala ilmiah yang dikelola dan diterbitkan oleh Program Studi Teknik Geologi Universitas Halu Oleo. Terbitan ini memuat artikel pada topik ilmu geologi maupun geologi terapan. Riset ilmu geologi mencakup riset sains kebumian di bidang geologi, geofisika, dan geokimia. Riset geologi terapan mencakup bidang geologi eksplorasi, geologi rekayasa, mitigasi bencana geologi, hidrogeologi, dan geologi lingkungan.
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Teknik Geologi dan Geologi Teknik
Articles 2 Documents
 1 
Search results for , issue "Vol 7 No 3 (2025): On Progress" : 2 Documents clear
Analisis Komposisi Mineral Lempung dan Maturitas Material Organik Daerah Balikpapan Selatan, Kota Balikpapan, Kalimantan Timur Jamaluddin, Jamaluddin; Oscar, Agus Wiramsya; Manik, Nijusiho; Umar, Emi Prasetyawati
OPHIOLITE: Jurnal Geologi Terapan Vol 7 No 3 (2025): On Progress
Publisher : Universitas Halu Oleo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56099/ophi.v7i3.p123-132

Abstract

The research aims to analyze the influence of clay mineral composition on the thermal evolution of source rock in the South Balikpapan area, Balikpapan City, East Kalimantan. Mudstone samples were analyzed by vitrinite reflectance (Ro), X-ray diffraction (XRD) and scanning electron microscopy (SEM). XRD analysis results show that the predominant clay minerals in the mudstone are mixed illite/smectite (35-42%), kaolinite (30-39%), illite (18-23%), and chlorite (5-10%). The predominant mineral presence of illite/smectite indicates a high heat retention capability. This plays an important role in the process of diagenesis and thermal transformation. High heat retention allows for localized temperature increases that further influence the thermal evolution of the host rock. The kaolinite mineral, which reaches 30-39%, contributes to the thermal stability of the host rock due to its inert nature in the medium temperature range. Meanwhile, the presence of illite minerals (18-23%) also supports thermal stability but with a smaller role than kaolinite. Otherwise, chlorite (5-10%) can increase the chemical reactivity of minerals under high temperature conditions, potentially triggering mild metamorphic reactions in rocks. The Ro values obtained from the samples range from 0.33% to 0.47%, which indicates a low to medium level of thermal maturity. This maturity level indicates that the mudstone rocks in the South Balikpapan area have not reached the optimal condition to produce hydrocarbons. These vitrinite reflectance values correspond to the estimated maximum temperature that the rocks have experienced, which is likely not high enough to trigger the formation of significant amounts of oil or gas.
Hydrogeochemical Analysis to Identify Potential Groundwater Characteristics in the Jayapura Region Wopari, Felice Deglardini; Suwarman, Rusmawan; Iskandar, Irwan
OPHIOLITE: Jurnal Geologi Terapan Vol 7 No 3 (2025): On Progress
Publisher : Universitas Halu Oleo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56099/ophi.v7i3.p112-122

Abstract

Hydrogeochemistry and stable isotope δ18O and δ2H are chemical methods used to understand the chemical process of water flows in the aquifer. This study aims to identify the characteristics of groundwater and surface water in the Jayapura area.  Water samples are collected from 87 points throughout the study area. The results of hydrogeochemical analysis on the main ions presented in the piper diagram show that the dominant water type is Ca/Mg-HCO₃-. In addition, other water types such as Ca-HCO₃-, Na-HCO₃-, Mg-SO42-, Ca-Cl, and Na-Cl are found. Rainwater is used as the reference line in the diagram, referred to as LMWL (local meteoric water line), with the equation H = 7.019δ18O + 7.5162 and a correction coefficient of 0.997. Stable isotope analysis of δ18O and δ2H in groundwater and surface water shows that most of the water is within the range of the LMWL reference line. There are two points above the LMWL reference line with Ca-Cl water type. The result of this study indicated that the characteristics of water resources in the Jayapura area are influenced by the interaction between water and mineral weathering near the surface. This interaction provides a natural and good water resource potential in the region.

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