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UNM Geographic Journal
Published by Universitas Negeri Makassar
ISSN : 25809423     EISSN : 25974076     DOI : 10.26858
Core Subject : Science,
Earth & Planetary Sciences
Arjuna Subject : -
Articles 4 Documents
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Search results for , issue "Volume 7 Nomor 2 September2024" : 4 Documents clear
ANALISIS KETEBALAN ENDAPAN LATERIT DAN PENGARUHNYA TERHADAP KADAR NIKEL DI DAERAH KONINIS, KABUPATEN BANGGAI Nonsi, Mutiara; Arifin, Yayu Indriati; Akase, Noviar
UNM Geographic Journal Volume 7 Nomor 2 September2024
Publisher : Universitas Negeri Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26858/ugj.v7i2.66090

Abstract

The Koninis region has diverse morphological features accompanied by the formation of nickel laterite deposits, leading to variations in the thickness of these deposits. The research location is administratively part of Banggai Regency, at coordinates 05°0'10" S and 122°15'40" E, within the concession area of PT. Koninis Fajar Mineral, covering approximately 138 hectares. This study aims to understand the morphological conditions and analyze the correlation between the thickness of nickel laterite deposits and the existing morphological conditions in the research area using methods such as geological mapping, petrographic analysis to determine the lithology of the research area, X-Ray Fluorescence (XRF) geochemical analysis to identify the nickel laterite ore zones, and studio analysis. The results indicate a range of laterite thicknesses, from a minimum of 6.5 meters to a maximum of 34 meters, with varying thicknesses within each zone. Analysis shows that thicker saprolite corresponds to higher nickel content, while thicker limonite correlates with lower nickel content.
GEOLOGI DAN ANALISIS JENIS BATUAN ASAL PADA PEMBENTUKAN ENDAPAN NIKEL LATERIT DI KECAMATAN BUNTA, KABUPATEN BANGGAI Yuriadi, Bilal Aditya; Arifin, Yayu Indriati; Hutagalung, Ronal
UNM Geographic Journal Volume 7 Nomor 2 September2024
Publisher : Universitas Negeri Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26858/ugj.v7i2.66100

Abstract

This research is motivated by the presence of nickel laterite deposit potential originating from various types of lithology in the Bunta sub-district, Banggai Regency, which needs to be followed up to facilitate exploration of nickel laterite. The research area is located at coordinates 122°15'8" - 122°15'18" South Latitude and 0°50'36" - 0°51'18" East Longitude, covering an area of approximately ±441 hectares. The purpose of this study is to understand the geology of the research area and the types of source rocks that have formed nickel laterite deposits in the area. The data used in this research includes geomorphological data, structural data, lithological data, and rock samples. The collected data will produce information on rock types and interpretations of the geological history of the research area. Based on the analysis, the geomorphology of the research area consists of three units: structural hills, denudational hills, and interhill plains. The rock types in the research area include lherzolitic serpentinized rocks and serpentinites, which are part of the ultramafic complex. The observed and developed structure in this area is tensile fractures with a dominant direction of Northwest - Southeast. The results show that this area could be exposed due to oceanic crust subduction, which has uplifted ultramafic rocks to the surface, leading to physical and chemical weathering and the formation of nickel laterite deposits.
STUDI GEOMORFOLOGI DAERAH TENILO DAN SEKITARNYA, KECAMATAN TILAMUTA, KABUPATEN BOALEMO, PROVINSI GORONTALO Yenayo, Hafipa; Arifin, Yayu Indriati; Hutagalung, Ronal
UNM Geographic Journal Volume 7 Nomor 2 September2024
Publisher : Universitas Negeri Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26858/ugj.v7i2.66275

Abstract

The research area is located in the village of Tenilo and its surroundings, which exhibit interesting land characteristics and features, making it an attractive site for study. This research aims to analyze and map the geomorphological conditions in order to obtain information related to various geomorphological aspects. The method used is the analysis of geomorphological aspects. The results of this study indicate that the geomorphological units in the area include volcanic hills, denudational hills, and marine plains. The geomorphological aspects of this area are categorized as follows: morphography, consisting of hill and plain units; morphometry, with elevation points ranging from 0 to 350 meters above sea level, and slope gradients from flat to steep; morphogenesis, which includes active morphostructures such as faults and joints, and passive morphostructures such as andesite, volcanic breccia, and alluvial deposits; morphodynamics, characterized by river flow patterns including dendritic and sub-parallel patterns, with river stages ranging from mature to youthful. According to the regional geological map of the Tilamuta sheet, the morphochronology of the research area dates back to the Eocene to Holocene epochs, and the morpho-arrangement of the area is dominated by high erosion processes.
STUDI DIAGENESIS BATUAN KARBONAT DENGAN METODE PETROGRAFI DESA KAYUBULAN KECAMATAN BATUDAA PANTAI KABUPATEN GORONTALO Pakaya, Siti Aqdawiya; Indriati Arifin, Yayu; Akase, Noviar
UNM Geographic Journal Volume 7 Nomor 2 September2024
Publisher : Universitas Negeri Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26858/ugj.v7i2.68261

Abstract

Batugamping merupakan batuan sedimen yang dapat memberikan informasi penting tentang lingkungan pengendapan dan umur geologi suatu daerah. Penelitian ini berfokus pada diagenesis batugamping di Desa Kayubulan, Kecamatan Batudaa Pantai, Kabupaten Gorontalo, dengan tujuan menganalisis kondisi geologi, mikrofasies, dan proses diagenesis yang terjadi. Metode yang digunakan mencakup analisis petrografi dan mikropaleontologi. Hasil penelitian mengidentifikasi dua satuan geomorfologi utama: Satuan Perbukitan Denudasional dan Satuan Dataran Aluvial dengan pola aliran parallel. Daerah penelitian memiliki empat fasies: Packstone, Grainstone, Boundstone, dan Endapan Aluvial. Struktur geologi menunjukkan arah dominan Utara-Selatan, sedangkan sesar turun berorientasi N 70⁰/32⁰ E, mengindikasikan ketidakparalelan antara keduanya, dengan sesar turun menyilang arah kelurusan lereng sekitar 70° dari sumbu Utara-Selatan. Berdasarkan Standar Microfasies (SMF), fasies Boundstone termasuk ke dalam SMF-7 Organic Boundstone, Platform-Margin “Reef” dengan lingkungan pengendapan FZ 5 Terumbu Tepi Paparan (Platform-Margin Reefs), dan SMF-18 Grainstone/Packstone with Abundant Foraminifera or Algae yang meliputi fasies Packstone dan fasies Grainstone dengan lingkungan pengendapan FZ 7 Laut Terbuka (Open Marine). Proses diagenesis yang terjadi di daerah penelitian ini adalah pelarutan (dissolution), neomorfisme, dan sementasi. Berdasarkan hal tersebut, dapat diketahui bila lokasi penelitian terbentuk pada zona transisi back reef hingga zona reef flat.

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