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All Journal Buletin Sumber Daya Geologi Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources)
Sam Permanadewi
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Chemistry Earth & Planetary Sciences Education Energy Engineering Environmental Science

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CEBAKAN NIKEL LATERIT DI PULAU GAG, KABUPATEN RAJA AMPAT, PROVINSI PAPUA BARAT Sam Permanadewi
Buletin Sumber Daya Geologi Vol. 12 No. 1 (2017): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (9499.545 KB) | DOI: 10.47599/bsdg.v12i1.23

Abstract

Pulau Gag, yang terletak terpencil di deretan kepulauan Raja Ampat, merupakan pulau yang memendam sumberdaya mineral yang berlimpah.  Sumber daya tersebut  berupa cebakan bijih nikel laterit (Ni, Co, Fe) yang menempati ± 2/3 dari pulau tersebut. Secara geologi, 2/3 bagian Pulau Gag ditempati oleh komplek ofiolit yang terdiri atas batuan ultramafik (serpentinit, harzburgit, dan piroksenit) sedangkan sisanya ditempati oleh batuan gunungapi. Komplek ofiolit di Pulau Gag ini diduga sebagai kerak samudera yang secara tektonik tersungkup di tepi benua dan busur kepulauan akibat adanya pergerakan Benua Australia kearah utara. Laterit nikel terbentuk akibat adanya proses pelapukan kimia yang terjadi  pada batuan ofiolit yang telah mengandung nikel. Bijih nikel sekunder berupa garnierite diendapkan kembali dalam horizon tanah penutup, limonit dan saprolit setelah mengalami pengayaan oleh proses pelapukan. Berdasarkan hasil analisa contoh, menunjukkan bahwa kandungan Ni dalam laterit adalah 1,2% Ni, >30% Fe (lapisan limonit); 1,2% Ni, <15% Fe (lapisan saprolit).   
Posisi Stratigrafi dan Petrogenesis Intrusi Pendul, Perbukitan Jiwo, Bayat, Kabupaten Klaten, Jawa Tengah Surono Surono; Udi Hartono; Sam Permanadewi
Jurnal Geologi dan Sumberdaya Mineral Vol. 16 No. 5 (2006): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v16i5.372

Abstract

The Pendul Intrusion consists of andesite, diabas, diorite, and gabbro; that are widely distributed within the Jiwo Hills, south of Klaten, Central Jawa. K/Ar datings of 4 rock indicate that there are two magmatism episodes; Middle Eocene - Early Oligocene (39,82 - 30,04 Ma) and Middle Miocene (17,22 - 13,85 Ma). Trace element concentrations of the Pendul rocks characterize that the magma was originated from subduction environment as a result of mantle wedge melting. The rocks are characterized by low Nb relative to K and La contents. The rare earth element signatures indicate that the Pendul magmas might have come from defferent parent magmas. The Middle Eocene - Early Oligocene parent magmas posses lower rare earth element concentrations than those of the Middle Miocene ones. Keywords: Bayat, Pendul Intrusion, two magmatism episodes, stratigraphy
Prospecting CCS Project in Indonesia: A Case Study in Meratus Mountains, South Borneo Irzon, Ronaldo; Hanang Samodra; Sam Permanadewi
Jurnal Geologi dan Sumberdaya Mineral Vol. 25 No. 1 (2024): JURNAL GEOLOGI DAN SUMBERDAYA MINERAL
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v25i1.784

Abstract

Long-term extensive carbon dioxide exposure inflicts diseases for humans and endangers the ecosystem. Carbon Capture and Storage (CCS) is a breakthrough to reduce CO2 in the atmosphere. The purpose of this study is to describe the CCS principles and suitability of this work in Indonesia, especially in the Meratus Mountains. The studied region is the major area of the Meratus Geopark. Selected ultramafic rocks from the Meratus Geopark were analyzed using X-Ray Fluorescence in the University of Tasmania. CCS project should consider the minimum implication for conservation strategy of geopark. Geologically, CCS is adapted through direct sequestration and carbon mineralization. Mafic-ultramafic lithologies are the best option for mineral carbonation. Most of the basaltic rocks in Indonesia are situated near active volcanoes that are heavily risky for CCS works. Ultramafic in the range of Meratus Geopark is clearly suitable for CCS because of its large expanse, far away from active volcanoes, without significant nickel mining activity. The project would promote geohazards and climate change issues of Meratus Geopark. In-situ CSS mineral carbonation should be located avoiding the Sultan Adam Mandiangin Serpentinite Geosite to nourish the geoconservation of Meratus Geopark. A successful CCS adaptation would be good evidence for the Indonesian government implementing the Paris Agreement. Keywords: Carbon Capture and Storage, In-situ mineral carbonation, ultramafic, Meratus Geopark.
Co-Authors Hanang Samodra Ronaldo Irzon Surono Surono Udi Hartono