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Sri Mulyaningsih
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Journal : Eksplorium : Buletin Pusat Pengembangan Bahan Galian Nuklir

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Ore Mineralization Characteristics in Hydrothermal Alteration at Mangunharjo and Surrounding Area, Pacitan, Indonesia Baba, Abdul Faisal; Mulyaningsih, Sri; Hidayah, Radhitya Adzan
EKSPLORIUM Vol. 43 No. 1 (2022): MAY 2022
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2022.43.1.6194

Abstract

The research area is located in Mangunharjo-Grindulu, Pacitan (Indonesia), as part of the Southern Mountain Tertiary Volcanic Arch. Outcrops of quartz veins-riched volcanic rock associated with sulfide minerals are found in this area. The Southern Mountain Oligo-Miocene magmatic arc is known as the potential area that contains precious metal deposits. The study aimed to determine the characteristics of the mineralized zone in this area. The research methods are geological surface mapping, thin-section observation, mineragraphy, and X-Ray Diffraction (XRD). The results show that the constituent lithologies were andesitic lava, breccia, and tuff; co-ignimbrite breccia, dacitic pumice and tuff, and dacitic dike; and pyroxene-rich andesitic volcanic rocks. The geological structure is dominated by oblique normal faults, strike-slip faults, and upward oblique faults associated with shear joints filled with quartz veins. Fieldwork observation, thin-section analyses, and mineragraphic and XRD observations identify three alteration zones in the hydrothermal system: the advanced argillic zone, the intermediate argillic zone, and the chloritized zone. By the mineral’s association, it is interpreted that the advanced argillic zone was formed at a temperature of 220-330oC and pH 3-6 due to dissemination with side rocks located near the hydrothermal flows; the intermediate argillic zone and the chloritized zone were formed at a temperature of 150-300oC and a pH of 5-6 due to chloritized alteration of the hydrothermal fluid carrying the ore. This alteration zone has no economic potential for precious metal minerals so it is better to be developed for education, conservation, and natural laboratories.
Co-Authors -, Nova Anggreni . Djumali A. Hiola, Fidyawati Aprianti Ahmad, Ardha Nurul Ahmad, Zul Fikar Alamri, Luthfia Ali, Rizky Nikmathul Husna Anastasya, Yolanda Andhika Djalu Sembada Anggreni, Nova Annajmi, Annajmi Apriliani, Leni Arcat, Arcat Arief, Syachrul Arif Budi Setianto Arif Wardana, Muhammad Baba, Abdul Faisal Budi Hariyono Budi Priyono Busro, Djumali dabutar, afif handika De Budi Irwan Taofik Devi, L R Devi, L R Dina Tania DJUMALI DJUMALI, DJUMALI Dwi Indah Purnamawati, Dwi Indah Edhy Sutanta (Jurusan Teknik Informatika IST AKPRIND Yogyakarta) Emilliana Natalia Trisakti Susanti, Maria Endang Darmawan Ery Fatarina Purwaningtyas Euis Erlin Fathoni, Shalsabila Destyari Fatmah Zakaria, Fatmah Firsty, Girly Risma Gani, Samsul Abdul Habibi, Nurul Is'ad Hasan, Nuradnin Hasanah, Setia Nur Heri Prabowo Heriyadi, Nur Widi Astanto Agus Tri Hidayah, Radhitya Adzan Hidayati, Fika Hiola, Fidyawati Aprianti A. Husadani, Y T Husadani, Y T Husna Ali, Rizky Nikmathul Husni Mubarak Ichwan Ridwan Rais IGAA. INDRAYANI, IGAA. Iis Wahyuningsih Imam Riadi Indrawati Wilujeng Irawan, S N Irawan, S N Ishak, Fifi Jussac Maulana Masjhoer Karwanto, Karwanto Katili, Dwi Nur Octaviani Katili, Tressan Eka putri Laila, Wahyu Kumil Leni Sri Mulyani Lestari, Taufika Putri Levana Sondakh Lusi Eka Afri Ma'la, Sidqi Yajidil Maghfirah, Rahmayani Manjurungi, Gia Arista Putri Maulani, Rakhil Meylina, Meylina Moch. Saiful Bachri Mufarrihul Hazin MUHAMMAD SHOLEH Muhammad Suyanto, Muhammad Mulyani, Eva Nining Sugihartini Nur Handayani Nur Mahdi Nur Rahmawati Nuraeni, Sinta Nurdin, St Surya Indah Nurdin, St.Surya Indah Nurrahmawati Nurul Hasanah Pertiwi, Citra Prakoso, Aditha Agung Priyanto, Sabda Elisa Rahayu, Hanifah Aulia Rahmandhala, Ilvan Dino Ranila, Suciati Rauf, Efri Leny Ria Indah Pratami Samuel Kristiyana Sanjoto, Siwi Santi Anggraeni Sapto Yuliani Septina, Norma Dewi Sidiq, Purnomo Siti Fatmawati Fatimah, Siti Fatmawati Suhartono Supratno, Haris Supriyadi, Asep Adang Susila, Aceng Ahmad Rodian Teger Basuki Umar, Siskawati Umboro, P A Vienastra, Septian Widayati, Wiludjeng Wiloso, Danis Agoes Wirono, Maryani Eka Wiwik Handayani Yosef Prihanto, Yosef Yuliandary Yunus Yunengsih, Yuyun