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All Journal Bulletin of Scientific Contribution : Geology IJOG : Indonesian Journal on Geoscience Jurnal RISET Geologi dan Pertambangan Geoscience Journal Journal of Geoscience, Engineering, Environment, and Technology Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources) JLBG (Jurnal Lingkungan dan Bencana Geologi) (Journal of Environment and Geological Hazards) Buletin Sumber Daya Geologi Indonesian Journal on Geoscience Indonesian Journal on Geoscience Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources) Journal of Geosciences and Applied Geology
Euis Tintin Yuningsih
Fakultas Teknik Geologi Universitas Padjadjaran
Chemistry Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Education Energy Engineering Environmental Science Physics

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

 1 
Petrogenetic of Igneous Complex of Ilota Nanasi Gold Deposit, Gunung Pani, Gorontalo, Indonesia Rompo, Iryanto; Ismail, Fajar; Santoso, STJ Budi; Rosana, Mega Fatimah; Yuningsih, Euis Tintin
Journal of Geoscience, Engineering, Environment, and Technology Vol. 8 No. 4 (2023): JGEET Vol 08 No 04 : December (2023)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2023.8.4.14250

Abstract

Ilota Nanasi Au-Ag deposit located in the western flank of the Gn. Baganite, a part rhyodacite dome in Gn. Pani district, Gorontalo Province, where the extensive exploration programs were carried out by PT Gorontalo Sejahtera Mining (a subsidiary of PT J Resources Nusantara) from 2012 – 2020.  As the result, a total of 72.7 Mt @ 0.98 g/t Au and 0.85 g/t Ag (2.3 Moz Au and 2.6 Moz Ag) mineral resource was delineated in 2019. This paper mainly aimed to the petrogenesis association of granitoid basement and rhyodacite unit as the host rock in the Ilota Nanasi gold deposit. The geology of Ilota Nanasi is overlain by Late Miocene granodiorite, andesite and diorite basement, Pliocene volcanic complex predominantly dacite – rhyodacite, tuff, breccia, and quaternary deposit as alluvial and surface breccia. Hydrothermal alteration and gold – silver mineralization centered in the porphyritic rhyodacite host rocks where the intense silicification forming a zone around the hydrothermal crackle breccia unit and/or high-density quartz vein, veinlets and stockworks. Mineralization in Ilota Nanasi is interpreted as a low sulfidation epithermal system dominated by a large volume of hydrothermal crackle breccia, intense quartz veining, veinlets, and high-density fracturing. A combined analytical result of petrography and whole-rock geochemistry has been used to assess the petrogenetic association of the rhyodacite and granitoid basement in the Ilota Nanasi. The result of the AFM diagram plot shows sample trends in calc-alkaline magma field. In contrast, the SiO2 – K2O plot distributed in two trends: the older unit was associated with high-K calc-alkaline and the shoshonite series for the younger unit. The changing of magma series is considered as product of crystallization differentiation of evolved parental magma or derived from the melting of mantle material after the mantle or lower crustal was metasomatized during a former episode of subduction.
Co-Authors Adi Hardiyono -, Adi Hardiyono Agus Didit Haryanto Ahadi Ahmat Lamburu Akhmad Fauzan Al Adawiah, Nabila. Anna Yushantarti, Anna Arief Nur Muchamad Asep Nurdin, Asep Asri Arifin Aton Patonah, Aton Bensaman, Benny. Boy Yoseph Cahya Sunan Sakti Syah Alam DEWI FITRIANI Dewi Gentana Dicky Muslim Emi Sukiyah F, Kurnia. Arfiansyah F. G, Aiwoy Fachrudin, Kurnia Arfiansyah Faizal, Reza Mochammad Gentana, Dewi Gentana, Dewi Haris Siagian Hashari Kamaruddin Hiroharu Matsueda Hiroharu Matsueda Hiroharu Matsueda Hutauruk, Gita Agnes Meilani Ildrem Syafri Indra Kusuma, Riko Ardiansyah Indrakususma, Riko Ardiansyah Ismail, Fajar K.S. Electricia Kamaruddin, Hashari Kemala Wijayanti, Kemala Kurnia Arfiansyah, Kurnia Matsueda, Hiroharu Matsueda, Hiroharu Mega F. Rosana Mega F. Rosana Mega Fatimah Rosana Mega Fatimah Rosana Mega Fatimah Rosana Mega Fatimah Rosana -, Mega Fatimah Rosana Meiriyanto, Fernandy Mohamad Nur Heriawan Nada Salsabila Deva Nana Sulaksana Nana Sulaksana Purbiyantoro, Aldila Jasmine Purwaiswanto, Bambang Antoro Raden Isnu Hajar Sulistyawan, Raden Isnu Hajar Riko Ardiansyah Indra Kusuma Rinawan, Fiandri Indra Rinawan, Fiandri Indragunawan Rompo, Ahmad Iryanto Rompo, Iryanto Rosana, M.Sc., Ph.D, Prof. Ir. Mega Fatimah Rosana, Mega F. Rosana, Mega Fatimah Ruswanto, . S.N. Viqnoriva Saala, Nur Afrianti Santoso, STJ Budi Saputra, Dwie H. Selasian Gussyak Soepriadi, Soepriadi Sulaksana, Nana Sutopo, S.T., Dipl. Geoth. En., P, Bronto Triyunita, Ade Wirdan, Muhammad Faisal Yuano Rezky, Yuano