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All Journal IJOG : Indonesian Journal on Geoscience Jurnal technoscientia Jurnal RISET Geologi dan Pertambangan Eksplorium : Buletin Pusat Pengembangan Bahan Galian Nuklir Journal of Geoscience, Engineering, Environment, and Technology Jurnal Geologi dan Sumberdaya Mineral Buletin Sumber Daya Geologi Jurnal GEOSAPTA International Journal of Community Service Learning Jurnal Abdi: Media Pengabdian Kepada Masyarakat Prosiding Seminar Teknologi Kebumian dan Kelautan (SEMITAN JURNAL TEKNOLOGI TECHNOSCIENTIA Indonesian Journal on Geoscience Indonesian Journal on Geoscience Journal of Applied Geology Ophiolite : Jurnal Geologi Terapan Jurnal Geologi dan Sumberdaya Mineral

Arifudin Idrus

Universitas Gadjah Mada

Author-ID : 285193

Humanities Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Physics Social Sciences Other

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Metamorphic rock-hosted orogenic gold deposit style at Bombana (Southeast Sulawesi) and Buru Island (Maluku): Their key features and significances for gold exploration in Eastern Indonesia Arifudin Idrus; Sukamandaru Prihatmoko; Ernowo Harjanto; Franz Michael Meyer; Irzal Nur; Wahyu Widodo; Lia Novelia Agung
Journal of Geoscience, Engineering, Environment, and Technology Vol. 2 No. 2 (2017): JGEET Vol 02 No 02 : June (2017)
Publisher : UIR PRESS

In Indonesia, gold is commonly mined from epithermal-, porphyry-, and skarn-type deposits that are commonly found in volcanic belts along island arcs or active continental margin settings. Numerous gold prospects, however, were recently discovered in association with metamorphic rocks. This paper focuses on metamorphic rock-hosted gold mineralization in Eastern Indonesia, in particular the Bombana (SE Sulawesi) and Buru Island (Maluku) prospects. At Bombana, gold-bearing quartz-veins are hosted by the Pompangeo metamorphic complex. Sheared, segmented veins vary in thickness from 2 cm to 2 m. Gold is mainly present in the form of ‘free gold’ among silicate minerals and closely related to cinnabar, stibnite, tripuhyite, and in places, minor arsenopyrite. The gold distribution is erratic, however, ranging from below detection limit up to 134 g/t. At least three generations of veins are identified. The first is parallel to the foliation, the second crosscuts the first generation of veins as well as the foliation, and the late-stage laminated deformed quartz-calcite vein represents the third mineralization stage. The early veins are mostly massive to crystalline, occasionally brecciated, and sigmoidal, whereas the second-stage veins are narrower than the first ones and less subjected to brecciation. Gold grades in the second- and third-stage veins are on average higher than that in the earlier veins. Microthermometric and Raman spectrometric studies of fluid inclusions indicate abundant H2O-NaCl and minor H2O-NaCl-CO2 fluids. Homogenization temperatures and salinities vary from 114 to 283 ºC and 0.35 to 9.08 wt.% NaCl eq., respectively. Crush-leach analysis of fluid inclusions suggests that the halogen fluid chemistry is not identical to sea water, magmatic or epithermal related fluids, but tends to be similar to fluids in mesothermal-type gold deposits. In Buru Island (Gunung Botak and Gogorea prospects), two distinct generations of quartz veins are identified. Early quartz veins are segmented, sigmoidal discontinuous and parallel to the foliation of the host rock. This generation of quartz veins is characterized by crystalline relatively clear quartz, and weakly mineralized with low sulfide and gold contents. The second type of quartz veins occurs within the ‘mineralized zone’ of about 100 m in width and ~1,000 m in length. Gold mineralization is intensely overprinted by argillic alteration. The mineralization-alteration zone is probably parallel to the mica schist foliation and strongly controlled by N-S or NE-SW-trending structures. Gold-bearing quartz veins are characterized by banded texture particularly following host rock foliation and sulphide banding, brecciated and rare bladed-like texture. Alteration types consist of propylitic (chlorite, calcite, sericite), argillic and carbonation represented by graphite banding and carbon flakes. Ore mineral comprises pyrite, native gold, pyrrhotite, and arsenopyrite. Cinnabar and stibnite are present in association with gold. Ore chemistry indicates that 11 out of 15 samples yielded more than 1 g/t Au, in which 6 of them graded in excess of 3 g/t Au. All high-grade samples are composed of limonite or partly contain limonitic material. This suggests the process of supergene enrichment. Interestingly, most of the high-grade samples contain also high concentrations of As (up to 991ppm), Sb (up to 885ppm), and Hg (up to 75ppm). Fluid inclusions in both quartz vein types consist of 4 phases including L-rich, V-rich, L-V-rich and L1-L2-V (CO2)-rich phases. The mineralizing hydrothermal fluid typically is CO2-rich, of moderate temperature (300-400 ºC), and low salinity (0.36 to 0.54 wt.% NaCl eq). Based on those key features, gold mineralization in Bombana and Buru Island tends to meet the characteristics of orogenic, mesothermal types of gold deposit. Metamorphic rock-hosted gold deposits could represent the new targets for gold exploration particularly in Eastern Indonesia.

Utilizing coal remaining resources and post-mining land use planning based on GIS-based optimization method : study case at PT Adaro coal mine in South Kalimantan Mohamad Anis; Arifudin Idrus; Hendra Amijaya; Subagyo Subagyo
Journal of Geoscience, Engineering, Environment, and Technology Vol. 2 No. 2 (2017): JGEET Vol 02 No 02 : June (2017)
Publisher : UIR PRESS

Coal mining activities may cause a series of environmental and socio-economic issues in communities around the mining area. Mining can become an obstacle to environmental sustainability and a major hidden danger to the security of the local ecology. Therefore, the coal mining industry should follow some specific principles and factors in achieving sustainable development. These factors include geological conditions, land use, mining technology, environmental sustainability policies and government regulations, socio-economic factors, as well as sustainability optimization for post-mining land use. Resources of the remains of the coal which is defined as the last remaining condition of the resources and reserves of coal when the coal companies have already completed the life of the mine or the expiration of the licensing contract (in accordance with government permission). This research uses approch of knowledge-driven GIS based methods mainly Analytical Hierarchy Process (AHP) and Fuzzy logic for utilizing coal remaining resources and post-mining land use planning. The mining area selected for this study belongs to a PKP2B (Work Agreement for Coal Mining) company named Adaro Indonesia (PT Adaro). The result shows that geologically the existing formation is dominated by Coal Bearing Formation (Warukin Formation) which allows the presence of remains coal resource potential after the lifetime of mine, and the suitability of rubber plantation for the optimization of land use in all mining sites and also in some disposal places in conservation areas and protected forests.

The Metamorphic Rocks-Hosted Gold Mineralization At Rumbia Mountains Prospect Area In The Southeastern Arm of Sulawesi Island, Indonesia Hasria Hasria; Arifudin Idrus; I Wayan Warmada
Journal of Geoscience, Engineering, Environment, and Technology Vol. 2 No. 3 (2017): JGEET Vol 02 No 03 : September (2017)
Publisher : UIR PRESS

Recently, in Indonesia gold exploration activities are not only focused along volcanic-magmatic belts, but also starting to shift along metamorphic and sedimentary terrains. The study area is located in Rumbia mountains, Bombana Regency, Southeast Sulawesi Province. This paper is aimed to describe characteristics of alteration and ore mineralization associated with metamorphic rock-related gold deposits. The study area is found the placer and primary gold hosted by metamorphic rocks. The gold is evidently derived from gold-bearing quartz veins hosted by Pompangeo Metamorphic Complex (PMC). These quartz veins are currently recognized in metamorphic rocks at Rumbia Mountains. The quartz veins are mostly sheared/deformed, brecciated, irregular vein, segmented and relatively massive and crystalline texture with thickness from 1 cm to 15.7 cm. The wallrock are generally weakly altered. Hydrothermal alteration types include sericitization, argillic, inner propylitic, propylitic, carbonization and carbonatization. There some precious metal identified consist of native gold and ore mineralization including pyrite (FeS2), chalcopyrite (CuFeS2), hematite (Fe2O3), cinnabar (HgS), stibnite (Sb2S3) and goethite (FeHO2). The veins contain erratic gold in various grades from below detection limit <0.0002 ppm to 18.4 ppm. Based on those characteristics, it obviously indicates that the primary gold deposit present in the study area is of orogenic gold deposit type. The orogenic gold deposit is one of the new targets for exploration in Indonesia

Halogen Chemistry of Hydrothermal Micas: a Possible Geochemical Tool in Vectoring to Ore for Porphyry Copper-Gold Deposit Arifudin Idrus
Journal of Geoscience, Engineering, Environment, and Technology Vol. 3 No. 1 (2018): JGEET Vol 03 No 01 : March (2018)
Publisher : UIR PRESS

Porphyry copper-gold deposit commonly exhibits an extensive alteration zone of hydrothermal micas particularly biotite and sericite. This study is aimed to analyze and utilize the chemistry of halogen fluorine and chlorine of biotite and sericite to be a possible tool in vectoring to ore for copper porphyry deposits. To achieve the objectives, several selected altered rock samples were taken crossing the Batu Hijau copper-gold mine from inner to outer of the deposit, and hydrothermal micas contained by the rocks were analyzed petrographically and chemically. Mineral chemistry was detected by electron microprobe analyzer, whilst biotite is petrographically classified as either magmatic or hydrothermal types. Sericite replacing plagioclase occurred as fine-grained mineral and predominantly associated with argillic-related alteration types. Biotites in the Batu Hijau deposit are classified as phlogopite with a relatively low mole fraction magnesium (XMg) (~0.75) compared to the “typical” copper porphyry deposit (~0.82). The relationship between the XMg and halogen contents are generally consistent with “Fe-F and Mg-Cl avoidance rules”. F content in biotite and sericite decrease systematically from inner part of the deposit which is represented by early biotite (potassic) zone where the main copper-gold hosted, to the outer part of the deposit. However, chlorine in both biotite and sericite from each of the alteration zones shows a relative similar concentration, which suggests that it is not suitable to be used in identification of the alteration zones associated with strong copper-gold mineralization. H2O content of the biotite and sericite also exhibits a systematic increase outward which may also provide a possible geochemical vector to ore for the copper porphyry deposits. This is well correlated with fluorine content of biotite in rocks and bulk concentration of copper from the corresponding rocks.

Fluid Inclusion Study of The Tumpangpitu High Sulfidation Epithermal Gold Deposit in Banyuwangi District, East Java, Indonesia Yu Yu Myaing; Arifudin Idrus; Anastasia Dewi Titisari
Journal of Geoscience, Engineering, Environment, and Technology Vol. 3 No. 1 (2018): JGEET Vol 03 No 01 : March (2018)
Publisher : UIR PRESS

The Tumpangpitu high sulfidation (HS) epithermal gold deposit is located in the south coast of East Java, Banyuwangi District, East Java Province, Indonesia. This area lies within the central portion of the Cenozoic Sunda‐Banda magmatic arc which trends southeast from northern Sumatra to west Java then eastward through east Java, Bali, Lombok, Sumbawa and terminating at Banda sea. The geology of the Tumpangpitu is predominantly occupied by Late Oligocene to Middle Miocene low-K calc-alkaline to alkaline andesitic volcanic rocks and interbedded with volcaniclastic rock sequences, which are associated with low-K intermediate intrusions. The mineralization style at the Tumpangpitu area is composed of a high‐sulfidation (HS) epithermal gold-copper system which is typically associated with concealed gold-rich porphyry copper system. The HS epithermal mineralization is hosted by volcanic and volcaniclastic rocks in this research area. The mineralization domains are divided into Zone A, Zone B and Zone C which are situated along NW-SE-trending silica ledges zones. The HS epithermal mineralization is texturally occurs as vuggy replacements mineralization as well as stockworks, disseminated forms, fractures and veins. Fluid inclusion study was conducted for 6 quartz vein samples which petrographically entrapped fluid inclusions. Homogenization temperature (Th) and melting temperature (Tm) can microthermometrically be determined by fluid inclusion analysis. The average homogenization temperature (Th) of the fluid inclusions gives 180˚C to 342˚C and melting temperature are from -0.1 ˚C to -1.4˚C. Tm corresponds to the salinities ranging from 0.1 to 4.5 wt% NaCl equivalent. The paleodepth of ore formation can be estimated from the salinity of fluid. Since the deposit was not formed at boiling condition, the minimum paleodepth of ore (quartz) samples taken from both shallow level (53.35 m) and deep level (135.15 m) is determined at 650m and 1,220 m, respectively. The microthermometric data point out that the Tumpangpitu deposit formed at moderate temperature and low salinity by magmatic fluid mixing and dilution by meteoric water during the hydrothermal fluid evolution. On the basis of the fluid inclusion microthermometric data and its other key characteristics, the Tumpangpitu gold mineralization shares some similarities compared to other typical HS-epithermal gold deposits worlwide although it also shares few differences.

Mineralogy and Geochemistry of Gold Ore Low Sulfidation -Epithermal at Lamuntet, Brang Rea, West Sumbawa District, West Nusa Tenggara Province Rika Ernawati; Arifudin Idrus; Himawan Tri Bayu Murti Petrus
Journal of Geoscience, Engineering, Environment, and Technology Vol. 4 No. 3 (2019): JGEET Vol 04 No 03 : September (2019)
Publisher : UIR PRESS

There are two Artisanal Small scale Gold Mining (ASGM) location in Lamuntet, Brang Rea Subdistrict, West Nusa Tenggara Regency, namely Nglampar and Song location. Nglampar and Song location are included in the low sulfidation epithermal gold deposit system. The research purposes to analyze mineralogy and geochemistry of gold vein deposits and determine system of low sulfidation gold ore in Nglampar, Lamuntet Village. The methods used to determine the mineralogy of gold vein deposits are petrography, mineragraphy and X-ray diffractometer (XRD) analysis, while geochemical analysis using Scanning Electron Microscope (SEM) with Energy Dispersive X-Ray Spectroscopy (EDS), Fire Assay (FA) and Atomic Absorption Spectrophotometry (AAS). The results showed that the minerals contained were quartz (Qz), sericite (Ser), Chalcedon (Chc), chlorite (Chl), pyrite (Py), sphalerite (Sph), galena (Gn) , gold (Au), chalcopyrite (Cp), argentite (Ag), arsenopyrite (Apy), Azurit (Az), Malakit (Mal) and bornite (Bn). Abundant mineral availability such as sphalerite, galena, chalcopyrite and arsenopyrite are characterized by high levels of Zn, Pb, Cu and As the metal in vein deposits. This can be seen on the chemical content of ore in gold vein deposits ie Au 0.1 ppm -27.8 ppm, Ag 3 ppm-185 ppm, Pb 101 ppm - 35,800 ppm, Zn 73 ppm-60,200 ppm, Cu 26 ppm - 1,740 ppm, and As 150 ppm - 6,530 ppm. Based on the results of SEM-EDS analysis shows that the type of gold mineral is the electrum because of the content of Ag> 20%. Based on those characteristics of the mineralogy and geochemistry in this study showed that low sulfidation gold ore in this area is categorized as polymetallic gold-silver system.

Alteration Alteration, Mineralization and Geochemistry of Metamorphic Rocks Hosted Hydrothermal Gold Deposit at Rumbia Mountains, Bombana Regency, Southeast Sulawesi, Indonesia Hasria Hasria; Arifudin Idrus; I Wayan Warmada
Journal of Geoscience, Engineering, Environment, and Technology Vol. 4 No. 2 (2019): JGEET Vol 04 No 02 : June (2019)
Publisher : UIR PRESS

In Indonesia, gold is commonly mined from porphyry, epithermal and skarn type deposits that are commonly found in volcanic/magmatic belts. However, were recently numerous gold prospects discovered in association with metamorphic rocks. This paper is intended to describe an alteration and ore mineralogy hosted by metamorphic rocks at Rumbia mountains, Bombana regency, Southeast Sulawesi province, Indonesia. The study area is found the placer and primary gold hosted by metamorphic rocks. The placer gold is evidently derived from gold-bearing quartz veins hosted by Pompangeo Metamorphic Complex (PMC). This study is conducted in three stages, three stages including desk study, field work and laboratory analysis. Desk study mainly covers literature reviews. Field work includes mapping of surface geology, alteration and ore mineralization as well as sampling of representative rocks types, altered rocks and gold-bearing veins. Laboratory analysis includes the petrologic observation of handspecimen samples, petrographic analysis of the thin section and ore microscopy for polished section, XRD (X-ray diffraction), ICP-AES (Inductively Coupled Plasma Atomic Emission Spectroscopy), ICP-MS (Inductively Coupled Plasma Emission Mass Spectrometry and FA/AAS (Fire Assay/Atomic Absorbtion Spectophotometry) analysis. The results shows that the alteration characteristics of hydrothermal gold deposits in Mendoke and Rumbia mountain consist of 3 (three) alterations namely sericitic, argillic dan propylitic. Characteristics of mineralization hydrothermal gold deposits in the research area are generally p related to gold-bearing quartz veins/veinlets consist of chalcopyrite, pyrite, chrysocolla, covellite, cinnabar, magnetite, hematite and goetite in rocks categorized into greenschist facies. There are three generations of veins identified including the first is parallel to the foliations, the second crosscut the first generation of veins/foliations, and the third is of laminated deformed quartz+calcite veins at the late stage. The quartz veins commonly deformed, segmented, massive, laminated, irregular, brecciated, and occasionally sigmoidal. The veins contain erratic gold in various grades from below detection limit <0.0002 ppm to 18,4000 at found in third generation veins which are laminated quartz±calcite in argillic alteration. ppm. The protoliths of metamorphic rocks in Rumbia Mountain, which comes from sedimentary rocks, spesifically pelitic rocks and graywacke. Based on those characteristics, it obviously indicates that the primary gold deposit present in the study area is of orogenic gold deposits type. The orogenic gold deposit is one of the new targets for exploration in Indonesia.

Geology, Rock Geochemistry and Ore Fluid Characteristics of the Brambang Copper-Gold Porphyry Prospect, Lombok Island, Indonesia. Arifudin Idrus; Aji Syailendra Ubaidillah; I Wayan Warmada; Syafruddin Maula
Journal of Geoscience, Engineering, Environment, and Technology Vol. 6 No. 1 (2021): JGEET Vol 06 No 01 : March (2021)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2021.6.1.6145

Brambang is one of the porphyry copper-gold prospects/deposits situated along eastern Sunda arc. This study is aimed to understand geological framework, alteration geochemistry and ore fluid characteristics of the prospect. Fieldworks and various laboratory analyses were performed including petrography, ore microscopy, rock geochemistry, chlorite chemistry and fluid inclusion microthermometry. The prospect is composed of andesitic tuff and diorite which are intruded by tonalite porphyries. Tonalite porphyries are interpreted as ore mineralisation-bearing intrusion. Various hydrothermal alterations are identified including potassic, phyllic, propylitic, advanced argillic and argillic types. Ore mineralisation is characterized by magnetite and copper sulfides such as bornite and chalcopyrite. Potassic alteration is typified by secondary biotite, and associated with ore mineralisation. Mass balance calculation indicates SiO2, Fe2O3, K2O, Cu and Au are added during potassic alteration process. Ore forming fluid is dominated by magmatic fluid at high temperature (450-600ºC) and high salinity (60-70 wt. % NaCl eq.). Hydrothermal fluid was diluted by meteoric water incursion at low-moderate temperature of 150-400ºC and salinity of 0.5-7 wt. % NaCl eq.

TEKSTUR DAN ZONASI ENDAPAN URAT EPITERMAL DAERAH CIHONJE, KECAMATAN GUMELAR, KABUPATEN BANYUMAS, JAWA TENGAH Isyqi Isyqi; Mochammad Aziz; Arifudin Idrus
JURNAL RISET GEOLOGI DAN PERTAMBANGAN Vol 26, No 1 (2016)
Publisher : Indonesian Institute of Sciences

Daerah Cihonje dan sekitarnya memiliki sistem mineralisasi epitermal yang ditandai dengan kehadiran endapan urat. Endapan urat epitermal terbentuk karena proses pengisian rongga (cavity filling) oleh larutan hidtrotermal. Identifikasi karakteristik endapan urat epitermal perlu dikaji lebih mendalam karena dapat mempermudah kegiatan eksplorasi logam mulia maupun logam dasar. Penelitian ini bertujuan untuk mengetahui karakteristik tekstur urat yang berkembang serta menentukan zona mineralisasi logam mulia dan logam dasar daerah penelitian. Metoda yang digunakan dalam penelitian ini adalah analisis slab urat, analisis petrografi, analisis mineragrafi serta analisis kadar logam mulia dan logam dasar pada endapan urat dengan menggunakan Atomic Absorption Spectrophotometry (AAS). Hasil penelitian menunjukkan tekstur urat di daerah penelitian dibedakan menjadi empat kelompok yaitu kelompok Lattice Bladed, Cockade, Saccharoidal, dan kelompok Sulfide Banded-Disseminated Sulfide. Tekstur urat yang mengandung logam mulia (emas, perak) terdapat di dalam Zona Super Crustiform – Colloform (CC), sedangkan tekstur urat yang mengandung logam dasar terdapat di dalam Zona Super Crystalline Quartz (X). Hasil analisa mineragrafi menunjukkan kandungan mineral logam yang berasosiasi dengan endapan urat di daerah penelitian adalah pirit, kalkopirit, arsenopirit, sfalerit, galena, emas, dan perak. Hasil analisa AAS menunjukkan kadar emas pada urat di daerah penelitian mencapai 83 ppm. Hal itu membuktikan bahwa daerah penelitian merupakan tempat akumulasi logam mulia dari sitem mineralisasi epitermal yang terjadi. Cihonje and surrounding area have epithermal mineralization system, which is identified by the existence of vein deposits. Epithermal vein deposits are formed by cavity filling of hydrothermal solution. Epithermal vein deposit characteristics need to be identified due to its functionality to localize the precious metal and base metal deposits. This research aimis to understand the characteristic of vein deposit in this research area. The method used are slab vein analysis, petrography, mineragraphy, and Atomic Absorption Spectrophotometry (AAS). Vein textures in research area are divided into four groups, which are Lattice Bladed Group, Cockade group, Saccharoidal Group, and Sulfide Banded – Disseminated Sulfide group. Vein textures that contain precious metal (gold, silver) is located in the Superzona Crustiform - Colloform (CC). And veins that contain base metal is located in the superzona Crystalline quartz. The mineragraphy analysis showed that vein deposits in this research area has been associated with Pyrite, Chalcopyrite, Arsenopirite, Sphalerit, Galena, Gold, and Silver. The results of AAS analysis showed that vein sample has 83 ppm Au content. That indicated that the research area is the zone of the precious metal accumulation.

MINERALOGI DAN GEOKIMIA BATUGAMPING MERAH PONJONG, GUNUNGKIDUL, DAERAH ISTIMEWA YOGYAKARTA – INDONESIA Didik Dwi Atmoko; Anastasia Dewi Titisari; Arifudin Idrus
JURNAL RISET GEOLOGI DAN PERTAMBANGAN Vol 26, No 1 (2016)
Publisher : Indonesian Institute of Sciences

Batugamping berwarna merah yang tersebar secara setempat-setempat dan berasosiasi dengan batugamping berwarna putih hingga abu-abu yang dijumpai di Daerah Ponjong, Kabupaten Gunungkidul, Daerah Istimewa Yogyakarta, termasuk dalam Formasi Wonosari-Punung. Batugamping tersebut perlu diteliti karakteristik mineralogi dan geokimianya, yang sangat diperlukan dalam memahami genesa batugamping di daerah tersebut. Hasil penelitian ini diharapkan dapat menambah data khususnya batugamping di daerah penelitian maupun Formasi Wonosari-Punung di daerah Pegunungan Selatan. Pengamatan petrografi dan XRD pada batugamping merah menunjukkan hadirnya mineral kalsit, kuarsa, siderit, hematit, dan titanit. Analisis geokimia oksida mayor batugamping merah memperlihatkan tren pengkayaan senyawa SiO2, TiO2, Fe2O3 dan MnO yang diinterpretasikan berhubungan dengan kehadiran mineral-mineral titanit (CaTiSiO5), siderit (FeCO3), hematit (Fe2O3), dan diduga rodokrosit (MnCO3). Mineral-mineral tersebut mempunyai karakteristik warna coklat kekuningan, merah muda sampai merah sehingga dimungkinkan dapat memberikan warna merah pada batugamping. Ada tiga proses yang diinterpretasi berperan dalam genesa batugamping merah Ponjong yaitu pengaruh material terigenus yang mengandung oksida SiO2, Al2O3, Fe2O3, dan TiO2 saat pengendapan batugamping, proses diagenesis oleh air meterorik yang mengkayakan senyawa Fe2O3 dan proses bekerjanya larutan hidrotermal.Red limestone, which is sporadically distributed and associated with white to grey limestone is located in Ponjong area, Gunungkidul District, Daerah Istimewa Yogyakarta. This limestone belongs to the member of Wonosari-Punung Formation. It is necessary to study the mineralogy and geochemistry chracteristics, which are important in understanding the genesis of the limestone. The result of this study might add the geological data for limestone in this study area and Wonosari-Punung Formation as well. The petrographical observation and X-ray diffraction results of red limestone indicated the presence of calcite, quartz, siderite, hematite and titanite. Major element analysis of the red limestone showed enrichment of SiO2, TiO2, Fe2O3 and MnO, which have considered to have relation to the presence of titanite (CaTiSiO5), siderite (FeCO3), hematite (Fe2O3), and rhodochrosite (MnCO3) in the red limestone. The minerals are typically yellowish brown, pink to red in colour, and are therefore interpreted to be responsible in giving red colour of the limestone. There are three processes that are considered in the genesis of the Ponjong red limestone, which are: impact of terrigenous material when deposition of the limestone, diagenesis process of meteoric water that enriched Fe2O3, and processof hidrotermal fluid activity.

Co-Authors A. Harijoko A. Harijoko A. Imai A. Imai A. M. Imran Abdul, Abdul Agung Harijoko Ahmad Ahmad Aji Syailendra Ubaidillah Aji Syailendra Ubaidillah Anastasia Dewi Titisari Araki, Naoto Asrafil Asrafil Ati, E. M. Atmoko, Didik Dwi Atmoko, Didik Dwi Bambang Priadi Dana, Cendi D. P. Danny, Rama Didik Dwi Atmoko Didik Dwi Atmoko Djoko Wintolo, Djoko Donatus Hendra Amijaya E. M. Ati E. M. Ati Edy Nursanto Ernowo Ernowo Ernowo Ernowo Ernowo Harjanto Ernowo Harjanto, Ernowo Ernowo, Ernowo F. M. Meyer F. M. Meyer F. Thamba F. Thamba Fadlin Fadlin Fadlin Fadlin Fadlin Fadlin Fadlin Fadlin Fadlin Idrus Fadlin Idrus Fadlin, Fadlin Fadlin, Fadlin Ferian Anggara Franklin Franklin Franklin Franklin Franklin, Franklin Franz Michael Meyer Franz Michael Meyer Franz Michael Meyer, Franz Michael Godang, Shaban Godang, Shaban Hakim, Fahmi Handayani, Esti Harijoko, A. Harjoko, Agung Hasria Hasria Hasria Hasria, Hasria Herfien Samalehu Herfien Samalehu Hill Gendoet Hartono Himawan Tri Bayu Murti Petrus I Gde Sukadana I Wayan Warmada I. Nur I. Nur I. Nur Idrus, Fadlin Imai, A. Imai, Akira Indra Sanjaya Irzal Nur, Irzal Isyqi Isyqi Iwan Setiawan Iwan Setiawan Johan Arif, Johan Kaharuddin Kaharuddin Kaharuddin, Kaharuddin Kant, Win Khant, Win Koichiro Watanabe, Koichiro Kolb, Jochen L. D. Setijadji L. D. Setijadji Lai, Chun-Kit Leeuwen, Theo Van Lia Novelia Agung Lia Novelia Agung, Lia Novelia Lucas Donny Setijadji Mansur, Suaib Meak, Ignas A. Meyer, F. M. Meyer, Franz M Mochammad Aziz Mochammad Aziz, Mochammad Moetamar Moetamar Moetamar Moetamar Moetamar, Moetamar Mohamad Anis Mohamad Anis, Mohamad Mudinillah, Adam Myaing, Yu Yu Nugroho Imam Setiawan Nur, I. Nur, I. Okki Verdiansyah Pramumijoyo, Pranayoga Pramumijoyo, S. Pratomo, Septyo Uji Priadi, Bambang Prihatmoko, Sukmandaru Putranto, Sapto Putranto, Sapto Rahmah, Yuyun Prihatining Rahmayuddin, Rahmayuddin Rika Ernawati Rohaya Langkoke S. Pramumijoyo S. Pramumijoyo Sapto Putranto Setiawan, Iwan Setiawan, Iwan Setijadji, L. D. Setijadji, Lucas D Shaban Godang Shaban Godang Sindern, Sven Siti Rahmawati H. Budiawan Subagyo Pramumijoyo, Subagyo Subagyo Subagyo Subagyo Subagyo Sufriadin, Sufriadin Sukadana, I Gde Sukamandaru Prihatmoko Sukamandaru Prihatmoko, Sukamandaru Sukmandaru Prihatmoko Sukmandaru Prihatmoko Sutarto Sutarto Sutarto Sutarto Sven Sindern Syafruddin Maula Syafruddin Maula Tamba, Fenny Thamba, F. Theo Van Leeuwen Thwee Aye, May Titisari, Anastasia Dewi Tun, Myo Min Wahyu Widodo Wahyu Widodo Waterman Sulistyana Bargawa Yonezu, Kotaro Yu Yu Myaing Yurniadi, Feddy

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