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All Journal Bulletin of Scientific Contribution : Geology IJOG : Indonesian Journal on Geoscience Journal of Geoscience, Engineering, Environment, and Technology Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources) Buletin Sumber Daya Geologi Kumawula: Jurnal Pengabdian Kepada Masyarakat Jurnal Citizenship Virtues Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources) Journal of Geosciences and Applied Geology
Iyan Haryanto, Iyan
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Humanities Chemistry Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Engineering Environmental Science Physics Social Sciences

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Journal : Journal of Geoscience, Engineering, Environment, and Technology

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Gold mineralization in the Neo-Tectonic Region of Honje Formation and Cipacar Formation Usman, Dudi Nasrudin; Sulaksana, Nana; Hirnawan, Febri; Haryanto, Iyan
Journal of Geoscience, Engineering, Environment, and Technology Vol 3 No 4 (2018): JGEET Vol 03 No 04 : December (2018)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (890.659 KB) | DOI: 10.24273/jgeet.2018.3.4.1852

Abstract

The gold ore mineralization region is a zone of mineralization which is inseparable from the role of geological structures, one of which is fracture. The Cibaliung and surrounding areas are epithermal gold mineralization zones, in this region there are two main mineralized zones, namely Cibitung Zone and Cikoneng Zone. It has almost the same characteristics where the fractures formed are quite large so that it influences the class of rock mass, but the other side is the presence of many fractures which make it easier for scattered mineralization to fill the fracture so that the formed vein is thick enough. This study aims to analyze the relationship of Rock Mass Rating (RMR) and Rocks Quality Design (RQD) to tectonic movements in the region to prove the neo-tectonic phenomena in the Honje Formation and Cipacar Formation using surface mapping methods. The methods used are rock type mapping, rock structure mapping, mapping and RQD measurements, rock descriptions and rock sample collection. All the data obtained are then verified and validated before processing and statistical tests. Statistical tests are carried out to ensure an analysis with a basis that is recognized by all parties. Both formations above have different ages, which is for the Honje Formation (Andesite Lava) with the final Miocene age and Cipacar Formation (tuff) at the age of Pleistocene. The findings of this study are the two formations measured by RQD and RMR on rock cracks and surrounding conditions; the RMR observation station made around 125 points in the Honje Formation and 117 points in the Cipacar Formation. The R2 value of the RMR value of the Honje Formation and the Cipacar Formation shows a positive relationship of 67%; The biggest RMR value is in Tuff rock. In addition, the relation between RMR Andesite Lava Value and RMR Tuff Value is done with T-Test between Andesite Lava and Tuff where the result shows no difference of mean between RMR Andesite Lava and RMR Tuff Value. Therefore, the tectonic processes that occur in the Honor Andesite Lava Unit of Honje Formation with the preceding position are formed, and the older age at the end of the Miocene age that is blocked by the field of unconformity experienced Continuity on Cipacar Formation Tuff Unit with the upper position that is formed after Honje Formation and younger age in Pleistocene. The continuation of the tectonic process proves the existence of active tectonic activity better known as Neo-tectonic.
Geochemistry of Volcanic Rocks in Ponelo Island, North Gorontalo, Indonesia Nurahmah, Siti Chusnul Chatimah; Rosana, Mega Fatimah; Haryanto, Iyan
Journal of Geoscience, Engineering, Environment, and Technology Vol. 9 No. 3 (2024): JGEET Vol 09 No 03 : September (2024)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2024.9.3.16832

Abstract

Ponelo Island is located in the northern part of Sulawesi, which is still an enigma regarding the genesis of the volcanic rocks found on this island. Therefore, the objective of this study is to understand the petrogenesis and tectonic implication of these volcanic rocks. Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) to obtain trace and rare earth elements is the method of this study. The volcanic rocks found on Ponelo Island consist of basalt and basaltic andesite rocks with a calc-alkaline affinity. The transition data suggested a highly fractionated cause of low transition element (Ni=17-38 ppm; Cr=13-47) compared to primary magma concentration, anomalies negative of Ba, Sr, and Ti of spider diagrams, and negative anomaly of Eu (Eu/Eu*=0.88-0.99). Relationship between low concentration between Ce/Y (0.74-0.76) and La/Yb vs Sm/Yb ratio indicated ~5% spinel-lherzolite mantle source partial melting. On the other hand, incompatible element ratios, such as Ba/Nb (39.03-45.28), Ba/Th (75.52-82.67), Rb/Nb (3.93-6.22), K/Nb (1772.22-2703.45), Ba/La=13.67-14.57, Th/La (0.17-0.18), La/Nb (2.91-3.16), depleted Nb/U (6-6.74), and also lack of xenolith or enclaves indicate cryptic crustal contamination.  The slab-derived fluid indicated by ratios of Rb/Y (0/019-0/05), Nb/Y (0.10-0.11), Th/Yb (0.52-0.61), and Ba/La ratio (13.29-14.57). Ponelo volcanic rocks shows typical calc-alkaline island arc tectonic setting particularly with enrichment in ion lithophile element (LILE) and light rare earth elements (LREE) along with depletion in high field strenght elements (HFSE) and heavy rare earth elemets (HREE), as shown by spider diagrams.
Co-Authors Abdul Bari Abdurrokhim ⠀ Abdurrokhim, . Adhiperdana, Billy G. Adhiperdhana, Billy Gumelar Adi Hardiyono, Adi Adjat Sudrajat Agus Didit Haryanto -, Agus Didit Haryanto Ahmad Helman Hamdani, Ahmad Helman Ali Djamhuri Andi Agus Nur, Andi Agus Andi Kurniawan Andriana, Yoga Arifin, Alvin Adam Aton Patonah, Aton Ayu, Shinta B.Sendjadja, Yoga Barkah, Mohamad Nursiyam David Victor Mamengko Djadjang Jedi Setiadi Dudi Nasrudin Usman Edi Tri Haryanto, Edi Tri Edy Sunardi Eka Wulandari Eko Budi Lelono, Eko Budi Emi Sukiyah Fadilah, Rizqi Fahira Lestari, Ayu Faisal Helmi Fatimah Rosana, Mega Fauziely, Lili Febri Hirnawan Fenry Simorangkir, Fenry Hadi, Mochamad Nur Hafiz, Surya Darma hardiyanto, lutfi Hendarmawan, . Hermes Panggabean Ikramina, Alma Irdanto Saputra, Irdanto Ismawan Ismawan, Ismawan Johanes Hutabarat Kurnia Arfiansyah, Kurnia Lamba, Lisa Mawardi, Sonny Mega Fatimah Rosana Muhammad Kurniawan Alfadli Mustofa, Santia Ardi Musu, Juwita Trivianty Nana Sulaksana Nanda Natasia Nisa Nurul Ilmi Nurahmah, Siti Chusnul Chatimah Nurdradjat -, Nurdradjat Nurdrajat Nurdrajat Panuju Panuju Pradnya Paramarta Raditya Rendra Raden Irvan Sophian, Raden Irvan Ramadhan, Galih Hadisurya Ridho Akbar, Radhitio Rizqi Fadilah, Dina Saputro, Anisa Ayu Saragih, Rahmat Yantono Sulastri, Murni Syaiful Alam Syalsabilla, Lola Lintang Vanessa, Agata Wicaksono, Danny Widyariestha, Mira Wiguna, Purwa Yarra Sutadiwiria Yeftamikha, . Yeftamikha, Yeftamikha Yoga Andriana Sendjaja, Yoga Andriana Yusi Firmansyah, Yusi Yuyun Yuniardi Zufialdi Zakaria, Zufialdi