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Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources)
Published by Pusat Survei Geologi
ISSN : 08539634     EISSN : 25494759     DOI : https://doi.org/10.33332
Core Subject : Science,
Chemistry Earth & Planetary Sciences Energy
The JGSM acts as a publication media of high quality scientific investigations resulted from various geological scientific issues. Published articles covers Geo-sciences, Geo-resources, Geo-hazards, and Geo-environments. Geo-sciences are basic earth sciences in geology, geophysics, and geochemistry. Geo-resources are applied earth sciences scoping in geological resources. Geo-hazards are applied earth sciences concerning in geological hazards. Geo-environments are applied earth sciences focusing in environmental geology.
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Geologi
Articles 482 Documents
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Palynostratigraphy, Paleoecology and Paleoclimatology of Early Pleistocene Based on Pollen Study of Pucangan Formation in Sangiran Area Eko Yulianto; Woro Sri Sukapti; Ruly Setiawan
Jurnal Geologi dan Sumberdaya Mineral Vol. 20 No. 3 (2019): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v20i3.461

Abstract

A pollen study has been conducted on samples taken from Pucangan Formation in Sangiran area. This study aims to reconstruct palynostratigraphy and to reveal environmental dynamics along with the deposition of Pucangan Formation with an emphasis on the influence of high frequency volcanism to the vegetational landscape in the montane area. The co-occurrence of Phyllocladus hypophyllus and Podocarpus imbricatus indicates Plistocene age of samples, and their stratigraphic position overlied by Middle Pleistocene Kabuh Formation leads to a conclusion of Early Pleistocene. All samples are included in Monoporites annulatus Peak Zone and subdivided into three Peak Subzone i.e. Polypodisporites radiates, Psilotum nudum, Magnastriatites grandiosa, Cyathea sp. and Laevigatosporites sp. Concurrent Peak Subzone, Interval Subzone between two Peak Subzones i.e. Polypodisporites radiates, Psilotum nudum, Magnastriatites grandiosa, Cyathea sp., Laevigatosporites sp. Concurrent Peak Subzone and Casuarina sp. Peak Subzone. Along with the deposition of Pucangan Formation, savannah with sparse swamp, riparian and lowland forest spreaded out around particularly on lowland, while few mangrove forest grew on muddy sea-land interface environment and heterogenous montane forests occupied highland. During the deposition of stratigraphic profile, savannah got flourished on new emerged land due to regression. Frequent volcanic eruptions along with the deposition of the upper stratigraphic profile has destroyed heterogenous montane forest and led to the homogenous Casuarina junghuniana forest.Keywords: Palynology, Early Pleistocene, vegetational landscape, savannah, montane forest, regression, volcanism
Morphotectonic Characteristics Of Cisadane Watersshed Based On Satellite Images Analysis Sonny Mawardi; Emi Sukiyah; Iyan Haryanto
Jurnal Geologi dan Sumberdaya Mineral Vol. 20 No. 3 (2019): Jurnal Geologi dan Sumberdaya Mineral
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Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v20i3.464

Abstract

Cisadane Watershed is one of the most rapidly growing areas and infrastructure development, and has developed as a residential, industrial, administrative centers and other economic activities. The purpose of this paper is to use remote sensing satellite imageries to identify the morphotectonic characteristics of the Cisadane watershed both qualitatively and quantitatively. Processing stereomodel, stereoplotting and stereocompilation on TerraSAR-X Digital Surface Model (DSM) and SPOT 6 imageries, produced the  Digital Terrain Model (DTM) image, which has not been affected by land cover. Fusion of the DTM  and Landsat 8 RGB 567+8 images  is used to interpret the distribution of lithology, geomorphological units, and lineaments, which are an indication of geological structures. The morphotectonic characteristics of sub-watersheds qualitatively was carried out a bifurcation ratio calculation (Rb) which indicates tectonic deformation. Based on the analysis of satellite images both qualitatively and quantitatively, the morphotectonic characteristics of the upstream, middle and downstream Cisadane Watershed have been deformed.Keywords : satellite images, morphotectonic, DSM, DTM, Cisadane Watershed.
Geology of the Eastern Part of the Volcanic-Kendeng Zone of East Java: Stratigraphy, Structures and Sedimentation Review from Besuki and Situbondo Areas Agus Handoyo Harsolumakso; Dardji Noeradi; Alfend Rudyawan; Dadan Amiarsa; Satryo Wicaksono; Affan A Nurfarhan
Jurnal Geologi dan Sumberdaya Mineral Vol. 20 No. 3 (2019): Jurnal Geologi dan Sumberdaya Mineral
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Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v20i3.465

Abstract

The Tertiary stratigraphy of Situbondo was constructed by a series of volcanoclastic-carbonate turbidite facies of Menuran Formation with Pacalan limestone Member, and Leprak Formation. These formations formed a regional east-west trending circular anticlinorium. The Tertiary formations were covered by Quaternary volcano-clastic Ringgit Formation and subsequent younger Bagor volcanic products. The oldest Tertiary rock units are the Late Miocene-Pliocene Menuran Formation, with Pacalan Limestone Member. Formation is mainly composed of foram-rich marls and calcareous, sometimes tuffaceous sandstones, with conglomerate intercalations. Sedimentation of this formation is interpreted as to be a mixing, from proximal to distal turbidite, involving volcaniclastic and carbonate sources, in  a bathyal open marine environment. The Early Pliocene Leprak Formation overlies conformably the Menuran Formation, which consists of alternating calcareous sandstones and tuff sandstones deposited in a bathyal open marine environment with proximal turbidite mechanism suggesting that basin depocenter was located to the east. Up to Late Pliocene, the region was dominated by developments proximal turbidite volcanoclastic sedimentation of The Leprak Formation, contemporaneous with increasing volcanic activity in the south. Deformation of Plio-Pleistocene in Java is believed to be the last major tectonic period, which forms the west-east trending structures. In Situbondo area, folding structures in this direction involves the Neogene Menuran Formation, Pacalan Member and Leprak Formation. Volcanic activity persists, and increases, with the activity of Ringgit-Beser volcano in Pleistocene. These late events of magmatism, volcanism and uplift were contributed to the last structural configuration of the area.Keyword : Situbondo, structural geology, volcanic-kendeng zone, stratigraphy
Plagioclase Fractionation On The Holocene Volcanic Rocks Evolution In West Halmahera Regency Ipranta Ipranta; Ronaldo Irzon
Jurnal Geologi dan Sumberdaya Mineral Vol. 20 No. 3 (2019): Jurnal Geologi dan Sumberdaya Mineral
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Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v20i3.468

Abstract

The tectonic complexity in the Maluku region is caused by the interaction of the three main platesin this area, namely: the Philippine Plate, the Australian Plate, and the Eurasian Plate. The origin of volcanic rock-forming material from Jailolo Mount., Sahu Mount., Gamkonora Mount., and Ibu Mount. in West Halmahera Regency is the aim of this study. Petrographic, trace elements, rare earth elements analysis are also used to study rock formation processes and correlations between sample groups. Bipolar microscope and Inductively Coupled Plasma - Mass Spectrometry of the Center for Geological Survey Laboratory are the analytical devices used in this study. Almost all samples are classified as andesite based on the comparison of the quartz, K-feldspar, and plagioclase compositions. There is a possibility of mixing between oceanic crust and continental crust of the studied Holocene volcanic which is indicated by La/Yb versus Nb/La diagrams. Fractional crystallization is considered more influential in rock formation compared to partial melting. The effect of plagioclase fractionation on the four volcanic rock groups is shown by the Y versus Sr/Y diagram and rare earth spider diagram patterns. Increased levels of rare earths in samples from G. Gamkonora and G. Sahu are strongly influenced by crystallization of plagioclase during rock formation.Key words: volcanic rocks, petrography, geochemistry, West Halmahera
Petrology and Geochemistry of The Volcanic Arc Tarusan Pluton in Comparison to Lolo Pluton, West Sumatra Ronaldo Irzon; Ildrem Syafri; Irfani Agustiany; Arief Prabowo; Purnama Sendjaja
Jurnal Geologi dan Sumberdaya Mineral Vol. 20 No. 4 (2019): Jurnal Geologi dan Sumberdaya Mineral
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Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v20i4.471

Abstract

The Volcanic Arc Suite is the group of batholiths in the range of the Barisan Mountains and mostly denotes I-type affinity. Previous investigations of the intrusions in West Sumatra emphasized the crystallization age without completing geochemistry characteristics. No former study discussed a pluton which mapped in the Kota XI Tarusan District. This study explains the geochemistry and petrology of the Tarusan Pluton using polarized microscope, XRF, and ICP-MS at the Center for Geology Survey of Indonesia. The microscopic analysis confirms the granite character of the samples. Although both plutons are identified as I-type calc-alkaline series, the Tarusan Pluton is peraluminous granite whilst the Lolo Pluton denotes wider range from metaluminous to peraluminous of granodiorite to granite. Both the plutons are clearly classified as volcanic arc granitoid in the correlation to Volcanic Arc Suite of Sumatra. Negative Ba, Nb, and P anomalies together with positive K, Nd, and Y anomalies are pronounced on the two felsic intrusions. Negative Eu anomaly on the Tarusan Pluton but the positive one at the Lolo Pluton might explain different magma evolution process.Keywords: volcanic arc granite, geochemistry, Tarusan Pluton, Lolo Pluton.
Perubahan Komposisi Batuan Metamorf Akibat Proses Alterasi Hidrotermal pada Endapan Emas di Pegunungan Rumbia, Pada Lengan Tenggara Pulau Sulawesi Hasria Hasria; Arifudin Idrus; I Wayan Warmada
Jurnal Geologi dan Sumberdaya Mineral Vol. 21 No. 3 (2020): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v21i3.477

Abstract

Pada proses alterasi hidrotermal, reaksi batuan samping dengan fluida hidrotermal yang melewatinya akan  menyebabkan perubahan komposisi (oksida/unsur) pada batuan yang dilewati maupun pada fluida itu sendiri. Perhitungan perubahan oksida/unsur bertujuan untuk menentukan oksida/unsur dalam batuan yang bertambah atau berkurang karena proses alterasi hidrotemal, dilakukan dengan menggunakan analisis ICP-AES (Inductively Coupled Plasma Atomic Emission  Spectroscopy) dan ICP-MS (Inductively Coupled Plasma Mass Spectrometry). Hasil penelitian menunjukkan bahwa oksida/unsur yang immobile umumnya relatif tidak mengalami perubahan komposisi selama proses alterasi hidrotermal berlangsung,  sedangkan oksida/unsur mobile umumnya mengalami penambahan dan pengurangan selama proses alterasi hidrotermal berlangsung. Pada alterasi propilitik, oksida/unsur mobile yang mengalami penambahan adalah As, Zr, Cu, Sb, Ca, CaO, MgO, MnO dan SiO2 dan yang mengalami pengurangan adalah U, Th, Co, Sn, Sr, Nb, Ba, K, Au, Pb, Zn, V, Fe, K2O, Na2O dan Fe2O3. Pada alterasi serisitik, oksida/unsur mobile yang mengalami penambahan adalah Sb, Zr, Ag, Pb, K, Na2O, SiO2 dan yang mengalami pengurangan  adalah U, Th, Co, As, Nb, Ba, Sn, Sr, Ca, S, Au, V, Zn, Cu, Fe, K2O, MnO, CaO, MgO, Fe2O3. Pada alterasi argilik, oksida/unsur mobile yang mengalami penambahan adalah  Sb, Fe, S, Cu, Zr, Ba, As, Au, Zn, V, dan SiO2 sedangkan yang cenderung mengalami pengurangan adalah Ca, U, Th, Nb, Sn, Sr, Co, Pb, K, CaO, Na2O, MnO, MgO, K2O dan Fe2O3.Katakunci : Alterasi hidrotermal, Pegunungan Rumbia, Kabupaten Bombana, perubahan oksida/unsur, mobile, immobile.
Depth Estimation of the Aquifer Using Geoelectric Technique and It′s Comparison with Drilling Result in Pekuncen Village, Jatilawang District, Banyumas Regency Septiawan Nurul Handika; Muhammad Sehah
Jurnal Geologi dan Sumberdaya Mineral Vol. 21 No. 2 (2020): JURNAL GEOLOGI DAN SUMBERDAYA MINERAL
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Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v21i2.478

Abstract

Pekuncen Village, Jatilawang District is one of the villages in Banyumas Regency which often experiences drought in the dry season. Exploration to obtain the groundwater sources needs to be done, especially to estimate the depth of the aquifer. The chosen exploration method was resistivity geoelectric using vertical sounding technique. Resistivity data acquisition is carried out on 3 trajectories with the length of the 1st and 3rd trajectories are 200 m, and the 2nd trajectory is 240 m. The sounding point on the 2nd trajectory was drilled, where rock samples were taken at every 5 m depth. The rock samples obtained were correlated with the resistivity data interpretation results, including the type and thickness of each depth. The aquifer in the research area consisted of two parts, namely unconfined aquifer and confined aquifer. The unconfined aquifer at the first sounding point is located at 6.80 – 34.38 m depth, the second sounding point at 7.00 – 28.89 m depth, and the third sounding point at 4.39 – 31.39 m depth. Then the confined aquifer at the first sounding point is located at less than 48.24 m depth, the second sounding point at less than 47.22 m depth, and the third sounding point at less than 47.36 m depth. The correlation between the resistivity data interpretation results at the second sounding point and the drill log data shows a slight difference in rock types and thickness. The difference of the rock types due to the drilling data interpretation results which divides the sand in the confined aquifers into fine, medium, and coarse grained sand. The difference of confined aquifer depth after being correlated is less than 2 m depth.Keywords: Aquifer, geoelectric survey, resistivity data, drill, Pekuncen, Banyumas.
Optimization of Limestone Production Based on Geological Structure Conditions for Blasting Geometry Design Fachrur Reza Assegaff; Cipta Endayana; Nana Sulaksana; Dwi Putranto Waloeyo
Jurnal Geologi dan Sumberdaya Mineral Vol. 21 No. 2 (2020): JURNAL GEOLOGI DAN SUMBERDAYA MINERAL
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Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v21i2.483

Abstract

The research location is in Sumber Arum, a village in Kerek District, Tuban Regency, East Java. The object of this study includes the state of the geological structure around the mining site and its effect on blasting activities. The purpose of this study is to obtain a blasting geometry design that is suitable for the geological structure conditions at the mining site so that the resulting blasting fragmentation has a uniform size to increase the amount of company production. The method used in this study is to combine data from measurements and observations in the field with blasting design theory. From these data, further analysis and trial blasting activities are conducted and the results obtained from the actual blasting plan with the proposed blasting plan are compared. The calculation results of the blasting geometry design obtained the proposed blasting geometry values, including the burden of 2.5 meters, the spacing of 3 meters, the stemming of 1.75 meters, the subdrilling of 0.5 meters, the shot hole depth of 6.5 meters, and the direction of the explosion of 6.5 meters that is located at point N37ºE. Based on the application, the blasting fragmentation with a size of ≤ 80 cm is evenly distributed, with a percentage of 99.44% of the total fragmentation resulting from blasting. The amount of limestone produced in one year is 20.138.946 tons.Keywords: blasting geometry, production, limestone, geological structure
Evolusi Cekungan pada Periode Holosen Kaitannya dengan Fluktuasi Muka Air Laut, Tektonik dan Perubahan Iklim di Nabire dan Sekitarnya, Papua Rio Alcanadre Tanjung Moechtar
Jurnal Geologi dan Sumberdaya Mineral Vol. 20 No. 4 (2019): Jurnal Geologi dan Sumberdaya Mineral
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Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v20i4.484

Abstract

Daerah penelitian terletak di Kabupaten Nabire, Papua yang sebagian besar wilayahnya ditutupi endapan Kuarter. Penelitian bertujuan untuk mengungkap dinamika Kuarter serta interval proses pengendapan berdasarkan aspek sedimentologi dan stratigrafi. Metode yang dilakukan adalah pemboran dangkal menggunakan hand auger sebanyak 48 titik. Hasil pengeboran menunjukkan  7 (tujuh) fasies pengendapan, yaitu: endapan limpah banjir, endapan cekungan banjir, endapan sungai, endapan rawa bakau, endapan pantai, endapan laut dekat pantai, dan batuan pra-Holosen. Berdasarkan rekonstruksi penampang stratigrafi, kelompok fasies pengendapan tersebut terbagi menjadi dua interval periode pengendapan. Interval periode pengendapan pertama merupakan fasies muka airlaut tinggi (transgresi) dan tersusun atas sistem laut dan sistem rawa. Interval periode pengendapan kedua merupakan fasies muka airlaut rendah (regresi) dan tersusun atas sistem laut, sistem rawa dan sistem sungai. Hasil pentarikhan umur menggunakan metode pentarikhan radiokarbon menunjukkan bahwa batas antara periode pertama dan periode kedua terjadi pada kisaran umur 9.200-10.700 tahun yang lalu. Kemunculan sistem sungai pada periode kedua diakibatkan oleh turunnya muka air laut. Kondisi ini menunjukkan kecenderungan tingkat energi semakin mengecil, berkaitan dengan jumlah volume air ketika itu. Jumlah volume air tersebut berhubungan dengan tingkat kelembapan yang bergantung pada siklus perubahan iklim. Fasies endapan rawa bakau dicirikan dengan keterdapatan Rhizophora sp., Sonneratia alba, dan Bruguiera cylindrica, terjadi penipisan endapan gambut pada fasies tersebut. Peristiwa tersebut menunjukkan bahwa iklim menuju ke kering. Munculnya fasies pantai di bagian tengah fasies endapan rawa bakau membuktikan bahwa ketika muka airlaut turun secara global, secara lokal muka airlaut tinggi pada periode tertentu. Gejala ini cenderung berkaitan dengan turunnya dasar cekungan (base level) akibat tektonik.Katakunci : Muka air laut, tektonik, iklim, Holosen, Nabire
Protolith Oceanic Island Arc dari Granitoid Tipe M dan I di Karangsambung, Kebumen, Jawa Tengah Chusni Ansori; Shaban Godang; Defry Hastria; Isyqi isyqi
Jurnal Geologi dan Sumberdaya Mineral Vol. 20 No. 4 (2019): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v20i4.485

Abstract

Granitoid rocks which found at Luk Ulo melange complex as rock fragments with  pale gray colour and faneritic texture. Petrogenesis and geotectonic of the granitoid is under debate. Some geologists consider as plagiogranite, which is formed from the Mid Ocean-ridge (MOR); or leucogranite which is formed from continental collision, and others argue as arc-related granitoid type.The field studies ware carried out on 5 (five) tracks around Luk Ulo River and 1 (one) track at Lokidang River. The pale grey Karangsambung granitoid is composed of the mainly  K-feldspar (34-55%), plagioclase (10-25%) and quartz (25-35%), and chemically contains SiO2 (61.25 - 66.06%); Al2O3 (13.94 – 14.61%), K2O (2.53 - 4.00%), Na2O (3.42 - 4.10%), CaO (2.32 - 4.76%), Fe2O3 total (5.85 – 8.71%), MgO (0.98 – 1.97%). The granitoid is M- and I-type that were formed at 760o - 800o C with a depth of about 20-30 km, resulting from the differentiation of magma from a fragment origin of the K-enriched oceanic island arc originating from drifting of the IAB fragment. The sample of basalt 17D has a relatively high of Nb/Ta ratio (20), low Rb (<2 ppm), low Ba (17 ppm), and is interpreted as interacting with MORB mantle magma containing rutile-melt;whereas quartz monzonite (17A) has a relatively low of Zr/Sm ratio (3.86), which is indicated to have been contaminated by a carbonatite magma. The spidergram pattern of mantle metagabbro (sample no. 13) similar with the basalt from IAB-Bransfield Strait (Antarctica). Results of a comprehensive geochemical study proposes that the current condition of the Karangsambung zone is part of geotectonic of ACM-Eurasia, that composed of a combination of four rock fragments, i.e. (a) the rocks which sourced from IAB fragments, (b) mantle MORB, (c) continental crust from the origin of ACM-Eurasia, (d) the origin fragment from carbonatite magma.Keyword: Luk Ulo Melange Complex, pale grey granitoid, Island-arc granitoid, M  and I-type granitoid

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