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All Journal JURNAL PengaMAS Journal of Science and Engineering Patria Artha Journal of Community Journal Of Khairun Community Services Servire: Jurnal Pengabdian Kepada Masyarakat
Hilda Alkatiri
Prodi Teknik Pertambangan Fakultas Teknik Universitas Khairun
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Journal : Journal of Science and Engineering

 1 
STUDI INTERPRETASI LAPISAN BAWAH PERMUKAAN TANAH DENGAN METODE GEOLISTRIK DI JALAN LINTAS SUBAIM-BULI KECAMATAN WASILE TIMUR KABUPATEN HALMAHERA TIMUR Amrih Halil; Arsal Tjina; Firman Firman; Alifianty Delila Imani Sumantri; Hilda Alkatiri
Journal of Science and Engineering Vol 6, No 1 (2023): JOURNAL OF SCIENCE AND ENGINEERING (JOSAE)
Publisher : Fakultas Teknik Universitas Khairun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33387/josae.v6i1.6330

Abstract

Secara geologi, Pulau Halmahera mempunyai banyak pegunungan, sehingga sangat rentan sekali berpotensi longsor. Kabupaten Halmahera Timur merupakan salah satu lokasi dengan struktur tanah tidak kompak serta banyak lereng yang tidak stabil sehingga ada beberapa titik terjadi longsor. Tujuan dari penelitian ini yaitu untuk mengetahui susunan lapisan bawah permukaan tanah, pada lokasi jalan yang longsor di Kecamatan Wasile Timur dengan menggunakan metode geolistrik schlumberger. Pendugaan geolistrik ini dimaksudkan untuk memperoleh gambaran mengenai lapisan tanah di abwah permukaan dan kemungkinan terdapatnya lapisan pada kedalaman tertentu. Penelitian berlokasi di jalan lintas Subaim-Buli, Kecamatan Wasile Timur, Kabupaten Halmahera Timur, Provinsi Maluku Utara dan dilakukan selama 11 bulan.Dari hasil pembahasan dan analisa perhitungan maka dapat disimpulan bahwa secara geologi daerah lintasan 1 dan 2 terdapat di formasi bacan dengan jenis batuan tersusun atas batuan Gunung Api berupa Lava, Breksi dan Tufa sisipan Konglomerat dan Batupasir. Secara litologi lintasan 1 dan 2 masing-masing memiliki 4 perlapisan dengan kedalaman mencapai 25 m. Lintasan 1 terdiri dari 4 perlapisan: lapisan pertama aluvium ,lapisan ke 2 batupasir ,lapisan ke 3 batulanau , dan lapisan terakhir shale dengan nilai resistivitas antara 2.08-563Ωm. Lintasan 2 terdiri dari 4 perlapisan: lapisan pertama shale, lapisan ke 2 kerikil, lapisan ke 3 batulanau, dan lapisan terakhir shale, dengan nilai resistivitas antara 0.57s-1141Ωm.
KARAKTERISTIKBATUAN METAMORF PAPALOANG -BACAN, HALMAHERA SELATAN, PROVINSI MALUKU UTARA Madi, Almun; Alkatiri, Hilda; Firman, Firman
Journal of Science and Engineering Vol 7, No 2 (2024): Journal of Science and Engineering (JOSAE)
Publisher : Fakultas Teknik Universitas Khairun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33387/josae.v7i2.9330

Abstract

The research location is in Papaloang village, Bacan Island, South Halmahera Regency, North Maluku Province. Metamorphic rocks in the Papaloang-Bacan Complex can be predicted as thermal dynamo metamorphic rocks (regional metamorphic), and are part of the Sibela Continental Suite which is Precambrian in age. The purpose of this study was to determine the characteristics of these rocks using petrographic methods, namely identifying texture, structure, and mineral content. Based on field observations and laboratory test results, metamorphic rocks in Papaloang are dominated by schist, mica schist, chlorite schist, chlorite-epidote schist, some phyllite, quartzite and gneiss with varying mineral compositions including biotite, hornblende/amphibolite, muscovite, tremolite-actinolite. Also filled with sulfide minerals such as pyrite, chalcopyrite, covellite and chalcocite as well as several iron oxide minerals. Foliation is relatively good, characterized by changes and interlocking of several minerals such as hornblende interlocking tremolite-actinolite, quartz interlocking iron oxide and Opak minerals, and changes in muscophite mica to biotite. This process is most likely related to high pressure from endogenous processes.
KARAKTERISTIKBATUAN METAMORF PAPALOANG -BACAN, HALMAHERA SELATAN, PROVINSI MALUKU UTARA Madi, Almun; Alkatiri, Hilda; Firman, Firman
Journal of Science and Engineering Vol 7, No 2 (2024): Journal of Science and Engineering (JOSAE)
Publisher : Fakultas Teknik Universitas Khairun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33387/josae.v7i2.9330

Abstract

The research location is in Papaloang village, Bacan Island, South Halmahera Regency, North Maluku Province. Metamorphic rocks in the Papaloang-Bacan Complex can be predicted as thermal dynamo metamorphic rocks (regional metamorphic), and are part of the Sibela Continental Suite which is Precambrian in age. The purpose of this study was to determine the characteristics of these rocks using petrographic methods, namely identifying texture, structure, and mineral content. Based on field observations and laboratory test results, metamorphic rocks in Papaloang are dominated by schist, mica schist, chlorite schist, chlorite-epidote schist, some phyllite, quartzite and gneiss with varying mineral compositions including biotite, hornblende/amphibolite, muscovite, tremolite-actinolite. Also filled with sulfide minerals such as pyrite, chalcopyrite, covellite and chalcocite as well as several iron oxide minerals. Foliation is relatively good, characterized by changes and interlocking of several minerals such as hornblende interlocking tremolite-actinolite, quartz interlocking iron oxide and Opak minerals, and changes in muscophite mica to biotite. This process is most likely related to high pressure from endogenous processes.
Co-Authors Abbas, Said Hi Alifianty Delila Imani Sumantri Almun Madi Amrih Halil Anas Abdul Latif Arbi Haya Arif, Abdul Kadir D Arif, Dedy Arsal Tjina Badrun Ahmad Firdawaty Marasabessy Firman Firman Firman Firman George Belly Sahetapy Muhammad Taufiq Yuda Saputra Nurdin, Rahmania Sagaf, Nurafni Syarifullah Bundang Wawan A.K Conoras