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Limestone Facies And Diagenesis On Tondo Formation At Kaisabu Village Bau-Bau City Southeast Sulawesi Province Chaerul, Muhammad; Ngkoimani, La Ode; Sadri, Sofyan
Journal of Geoscience, Engineering, Environment, and Technology Vol 2 No 1 (2017): JGEET Vol 02 No 01 : March (2017)
Publisher : UIR PRESS

This study aims to determine the limestone facies and diagenesis on Tondo Formation. The method used was petrographic method bypolarizing microscope. Based on the physical characteristics and biota contained, the carbonate rocks on tondo formation (Tmtl) can be grouped into two facies, namely: Wackestone and Packestone. The diagenesis process that occurred in Tondo Formation research area is microbial micritization, cementation and neomorphism which indicate that the Tondo Formation has existed on diagenetic environment of marine phreatic, meteoric phreatic and meteoric vadose.

EFEKTIVITAS PROBLEM-SOLVING DAN GUIDED INQUIRY DALAM MENINGKATKAN PENGUASAAN KONSEP FISIKA SISWA SMA Basri, Alpin; Ngkoimani, La Ode; Fahyuddin, Fahyuddin
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Publisher : Halu Oleo University

Abstrak.Tujuan penelitian ini adalah untuk mengetahui efektivitas model pembelajaran problem solving dan model pembelajaran guided inquirydalam meningkatkan penguasaan konsep siswa SMA pada materi gerak lurus. Penelitian ini merupakanquasiexperimental atau eksperimensemudenganbentuk deskriptif kuantitatifyang menggunakandua kelaseksperimen sebagaiobyekpenelitian. Sampel penelitian diambil dengan teknik purposive random sampling berjumlah 59siswa kelas XSMAN 10 Konawe Selatan yang terdistribusi padaÂ dua kelas yaitu kelas X IPA 1 sebanyak 29 siswa dan kelas X IPA 2 sebanyak 30 siswa. Kelas X IPA 2 mendapatkan pembelajaran menggunakan model problem-solving, sedangkan kelas X IPA 1 diberikan pembelajaran model guided inquiry. Penguasaan konsep siswa pada materi gerak lurus diukur menggunakan tes pilihan ganda. Hasil analisis deskriptif menunjukkan penerapan model problem-solving dan guided inquirydapat meningkatkan penguasaan konsep siswa SMA pada materi gerak lurus.Hasil analisis inferensial menunjukkan terdapat perbedaan yang signifikan antara model pembelajaran model problem-solving dan guided inquiry dalam meningkatkan penguasaan konsep siswa. Model pembelajaran guided inquiry lebih efektif dibandingkan model pembelajaran problem-solving.Â Kata Kunci: model pembelajaran problem-solving, model pembelajaran guided inquiry, penguasaan konsepÂ

Analisis Petrografi dan Geokimia Batuan Ultramafik Kompleks Ofiolit Kecamatan Andowia Kabupaten Konawe Utara, Provinsi Sulawesi Tenggara Hasria, Hasria; Ramadhan, Alan Muhammad; Okto, Ali; Masri, Masri; Bahdad, Bahdad; Ngkoimani, La Ode; Azzaman, Muhammad Arba
Geosapta Vol 8, No 2 (2022): JULI 2022
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jg.v8i2.14112

Area studi terletak pada daerah Laronanga Kecamatan Andowia Kabupaten Konawe Utara, Sulawesi Tenggara. Studi ini bertujuan untuk menentukan karakteristik batuan ultramafik berdasarkan analisis petrografi dan geokimia. Analisis petrografi digunakan untuk menentukan nama batuan sedangkan analisis geokimia dengan XRF (X-Ray Fluorescence) bertujuan untuk menentukan jenis magma, afinitas magma dan lingkungan asal magma. Hasil analisis petrografi menunjukkan bahwa batuan ultramafik area studi merupakan batuan beku ultramafik jenis peridotit-harzburgit. Adapun hasil analisis XRF batuan memperlihatkan bahwa jenis batuan beku di area studi adalah batuan peridotit-gabro dengan tipe afinitas/seri magmanya termasuk ke dalam seri tholeitic series, serta lingkungan asal terbentuk magma adalah berasal dari Oceanic Ridge and Floor atau Mid Oceanic Ridge (MOR).

Geodiversity Inventory and Scientific Value Evaluation of Southern Binongko Island in Wakatobi Regency Masri, Masri; Asruddin, La Ode; Ngkoimani, La Ode
Jurnal Lingkungan dan Bencana Geologi Vol 15, No 1 (2024)
Publisher : Badan Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34126/jlbg.v15i1.466

Binongko Island is one of the largest islands in Wakatobi Regency, Southeast Sulawesi, with unspoiled and exotic natural tourism. Several tourism objects are karstification products from the Ambeua Formation (Tmpa) and Quaternary (Qpl) limestone. To determine the potential of geodiversity on the island, an inventory and scientific value assessment were conducted. This paper presents the results of the inventory and evaluation of geological diversity as a potential geological heritage on Southern Binongko Island. The methods involve field geological mapping and laboratory analysis.. Field geological mapping include geological trajectory planning, lithology data collection, cave geometry descriptions, and preparation of geological diversity inventory matrices. Laboratory analysis includes observing the thin section using microscope polarization. The geomorphological units of the study area can be divided into karst hills and karst plains. Petrographic analysis of nine thin sections showed crystalline limestone units, grainstone, packstone, wackestone, and mudstone—geological structures in limestone terraces with different lithological variations. The geological diversity of the study area is divided into groups of endokarst cave, karst hills, beaches, and limestone terraces which are divided into 11 (eleven) geological sites, i.e., Topa Raja Cave, Topa Lemali Cave, Topa Lembuko Cave, Wa Ode Goa Cave, Yoro Beach, Koncu Patua Wali Hill, Mbara-mbara Beach, La Sikori Cave, Rock Park, La Handu Hill, and Wa Cimbaumba Beach. Geological sites in the study area have medium to high values.The comparison is based on the criteria of geological heritage (geoheritage); the research area is ranked nationally,with a low, medium, and high scientific value. The highest scientific value is in the Taman Batu geosite and KoncuPatua Wali Hills. Three geotracks are recommended: cave geotrack, rock garden hill geotrack, and beach geotrack.

Identifikasi Keterdapatan Endapan Emas menggunakan Metode Magnetik di Daerah Wumbubangka Kecamatan Rarowatu Utara Kabupaten Bombana Arlin, Muhamad; Jahidin; Ngkoimani, La Ode
Einstein's: Research Journal of Applied Physics Vol. 1 No. 1 (2023): Einstein's: Research Journal of Applied Physics
Publisher : Magister Fisika Pascasarjana Universitas Halu Oleo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33772/einsteins.v1i1.148

Telah dilakukan penelitian di Daerah Wumbubangka, Kecamatan Rarowatu Utara, Kabupaten Bombana yang bertujuan untuk menentukan keterdapatan bawah permukaan endapan emas. Metode yang digunakan dalam pengukuran geofisika ini adalah metode magnetik yang memanfaatkan sifat kemagnetan bumi. Pengambilan data dilakukan di 59 titik pengukuran dalam 3 lintasan dengan panjang lintasan yang bervariasi dengan jarak antar titik 5-10 meter menggunakan instrumen magnetometer tipe GSM-19T. Data magnetik diolah ke dalam software Microsoft Excel 2013 dan Oasis Montaj 6.4.1, hasil pemodelan dan anomali medan magnetik lokal kemudian dianalisis guna mengetahui keterdapatan endapan emas bawah permukaan. Hasil penelitian menunujukkan bahwa intensitas anomali magnetik lokal berada pada rentang -87.9 nT hingga 96.7 nT. Berdasarkan pemodelan 2D data anomali magnet lokal diindikasikan bahwa keberadaan emas bawah permukaan berada pada nilai suseptibilitas magnetik tinggi (0.000473 0.000725) SI pada batu sekis yang diduga berasosiasi dengan mineral pirit dan kalkopirit sebagai mineral pembawa emas.

POTENSI DAN PROBABILITAS KELONGSORAN LERENG TAMBANG KUARI BATUGAMPING DI DAERAH MORAMO UTARA, SULAWESI TENGGARA Masri, Masri; Mili, Marwan Zam; Nafiu, Waode Rizky Awaliah; Wahab, Wahab; Agriawan, Husran; Ngkoimani, La Ode
Jurnal Teknologi Mineral dan Batubara Vol 20 No 2 (2024): Jurnal Teknologi Mineral dan Batubara Edisi Mei 2024
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/jtmb.Vol20.No2.2024.1550

Demolition of limestone fragments in quarries can cause slope stability issues. This study aims to identify the potential for rock failures and determine the probability of failures on three quarry slopes. The type of rock failures was identified using kinematics analysis. Determining the probability of failures is also required to accommodate the uncertainty of input parameters in the factor of safety calculation. The probability of failure was determined using the limit equilibrium method and chi-square tests to fit shear strength curves on the discontinuities. The Barton-Bandis criterion was used to determine the shear strength of the discontinuities. On the slopes, the discontinuity types are bedding, joint, and shear fractures. Kinematics analysis of slope-1 and slope-2 revealed the possibility of wedge failures with an occurrence probability ranging from 19.80 to 20.81%. On slope 3, a planar failure possibility with a 69.49% of occurrence probability was identified. Even though the kinematics analysis suggested the possibility of rock failures, the factor of safety on all three slopes was above the threshold (7.28 – 30.58) with probability of failure ranging from 0 – 6.14%. Based on sensitivity analysis, factor of safety is most influenced by changes in the bedding cohesion. Variations in groundwater recharge at discontinuities also influence the factor of safety and the probability of failures, particularly in planar failures. It is recommended to evaluate other types of rock failures, such as the potential of rockfalls.

POTENSI DAN PROBABILITAS KELONGSORAN LERENG TAMBANG KUARI BATUGAMPING DI DAERAH MORAMO UTARA, SULAWESI TENGGARA Masri, Masri; Mili, Marwan Zam; Nafiu, Waode Rizky Awaliah; Wahab, Wahab; Agriawan, Husran; Ngkoimani, La Ode
Jurnal Teknologi Mineral dan Batubara Vol 20 No 2 (2024): Jurnal Teknologi Mineral dan Batubara Edisi Mei 2024
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/jtmb.Vol20.No2.2024.1550

Demolition of limestone fragments in quarries can cause slope stability issues. This study aims to identify the potential for rock failures and determine the probability of failures on three quarry slopes. The type of rock failures was identified using kinematics analysis. Determining the probability of failures is also required to accommodate the uncertainty of input parameters in the factor of safety calculation. The probability of failure was determined using the limit equilibrium method and chi-square tests to fit shear strength curves on the discontinuities. The Barton-Bandis criterion was used to determine the shear strength of the discontinuities. On the slopes, the discontinuity types are bedding, joint, and shear fractures. Kinematics analysis of slope-1 and slope-2 revealed the possibility of wedge failures with an occurrence probability ranging from 19.80 to 20.81%. On slope 3, a planar failure possibility with a 69.49% of occurrence probability was identified. Even though the kinematics analysis suggested the possibility of rock failures, the factor of safety on all three slopes was above the threshold (7.28 – 30.58) with probability of failure ranging from 0 – 6.14%. Based on sensitivity analysis, factor of safety is most influenced by changes in the bedding cohesion. Variations in groundwater recharge at discontinuities also influence the factor of safety and the probability of failures, particularly in planar failures. It is recommended to evaluate other types of rock failures, such as the potential of rockfalls.

Inventarisasi Keragaman Geologi Daerah Mawasangka Timur, Kabupaten Buton Tengah, Provinsi Sulawesi Tenggara Hasria, Hasria; Hamid, Fanul; Okto, Ali; Muliddin, Muliddin; Masri, Masri; Arisona, Arisona; Harisma, Harisma; Ngkoimani, La Ode; Sawaludin, Sawaludin; Salihin, La Ode Muhammad Iradat
Jurnal Geologi dan Sumberdaya Mineral Vol. 26 No. 3 (2025): JURNAL GEOLOGI DAN SUMBERDAYA MINERAL
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v26i3.852

Fenomena geologi yang berhubungan dengan aspek bentang alam di daerah Mawasangka Timur, Kabupaten Buton Tengah, Provinsi Sulawesi Tenggara mempunyai fitur yang beragam dan secara umum disusun oleh satuan batugamping Formasi Wapulaka yang berumur Pleistosen. Penelitian ini bertujuan untuk menginventarisasi potensi keragaman geologi (geodiversity) yang mendasarkan pada aspek bentang alam karst dan pantai. Fitur keragaman geologi di kawasan karst mencakup baik gejala endokarst seperti gua dan ragam jenis hiasan gua di dalamnya maupun gejala exokarst seperti bukit pepino, dolina, dan akumulasi air di lekuk dolina yang membentuk danau. Di kawasan pantai terjadi sedimentasi pasir putih di pantai landai yang penyebarannya membentuk spit, serta undak-pantai, stack, notches dan sea-cave. Aneka fitur fenomena geologi yang terinvetarisasi tersebut didukung oleh struktur geologi. Metode penelitian yang digunakan adalah melakukan inventarisasi melalui pemetaan keragaman geologi, yaitu berupa pengambilan data lapangan meliputi, litologi, geomorfologi, dan struktur geologi, yang dilengkapi informasi titik koordinat lokasi dan potret). Keragaman geologi tersebut tersebar di seluruh wilayah penelitian, terutama di bagian selatan dan timur. Kata Kunci: Keragaman geologi, Wapulaka, karst, dolina, gua, Mawasangka Timur. Abstract- Geological phenomena related to landscape aspects in the East Mawasangka area, Central Buton Regency, Southeast Sulawesi Province have diverse features, which mainly composed of limestones unit of the Pleistocene Wapulaka Formation. This study aims to inventory the potential of geological diversity based on aspects of karst and coastal landscapes. Features of geological diversity in karstic areas include both endokarst phenomena such as caves and various types of cave decoration as well as exokarst phenomena such as pepino hills, doline, and water accumulation in doline depression that form lakes. In the coastal area, white sand sedimentation occurs on sloping beaches that spread to form spits, as well as coastal terraces, stacks, notches, and sea caves. The various features of the inventoried geological phenomena are supported by geological structures. The research method used was to conduct an inventory through geological diversity mapping, in the form of field data collection (lithology, geomorphology, geological structure, location coordinates, and portraits). The geological diversity is spread throughout the study area, especially in the south and east. Keywords: Geodiversity, Wapulaka, karst, doline, cave, East Mawasangka.

Magnetic Basement Depth from Marine Magnetic Data in Cendrawasih Bay Hydrocarbon Prospect Area, Bird Head, Papua, Indonesia Ibrahim, Khalil; Kawab, Gracia Abigail Paraskah; Bijaksana, Satria; Fajar, Silvia Jannatul; Sapiie, Benyamin; Ngkoimani, La Ode; Suryanata, Putu Billy; Harlianti, Ulvienin; Kurniawan, Syaiful Apri; Wibisono, Salsabila Nadhifa
Indonesian Journal on Geoscience Vol. 12 No. 3 (2025)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.12.3.383-400

The magnetic basement and structural segmentation of the eastern Bird Head region, Papua, were investigated using marine magnetic data and frequency-domain inversion (MagB_Inv). The studied area includes The Cendrawasih and Yapen–Biak Basins, both were influenced by the Yapen strike-slip fault and transtensional tectonics. Processing involved reducing to the pole, spectral depth estimation, and 3D magnetic inversion to delineate basement geometry, and to infer the sediment thickness. Three structurally bounded subbasins were identified: (1) between Cendrawasih Bay and Num Island, (2) between Cendrawasih Bay and Yapen Island, and (3) between Yapen and Biak Islands. These subbasins exhibit magnetic basement depths ranging from 0.4 to 7 km and sediment thicknesses exceeding 3 km. Magnetic highs around Yapen Island correlate with Miocene volcanic and ultramafic outcrops, interpreted as shallow high-magnetization crustal blocks. The subbasins are bounded by ridges and faults, including the Yapen Fault Zone and fold-thrust systems, which deform both basement and sedimentary cover. The basement morphology controls sediment distribution, and defines fault-bound sedimentary zones, consistent with regional tectonic trends. Seismic cross-sections and shallow earthquake hypocentres, and further supports this structural segmentation. These results provide a structural framework to understand the basin structure, and to support preliminary hydrocarbon evaluations in this underexplored region. Despite these insights, interpretations are constrained by the non-uniqueness of magnetic inversion prosess and the absence of well and high-resolution seismic data.

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