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Jurnal Geologi dan Sumberdaya Mineral

JGSM
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Published by Kementerian Energi dan Sumber Daya Mineral

ISSN : 08539634 EISSN : 25494759 DOI : -

Core Subject : Science, Education, Social, Engineering,

Education Energy Engineering Environmental Science

Jurnal Geologi dan Sumberdaya Mineral (JGSM) is an Indonesian scientific journal published by the Center for Geological Survey, Geological Agency, Ministry of Energy and Mineral Resources. The journal receives Indonesian or English articles. Those articles are selected and reviewed by our professional editors and peer reviewers.

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Articles 6 Documents

Search results for , issue "Vol 20, No 4 (2019): Jurnal Geologi dan Sumberdaya Mineral" : 6 Documents clear

Geoconservation of Vertebrate and Human Ancient Fossils Site, The South TulungagungArea East Java Setiyabudi, Erick; Trihascaryo, Agus; Koesbarditi, Tutik; Adi Suriyanto, Rusyad; Bayu Murti, Delta
Jurnal Geologi dan Sumberdaya Mineral Vol 20, No 4 (2019): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

The paleontology and archeology sites in southern Tulungagung, East Java are part of the geodiversity and geological heritage that has significance for the process of evolution and migration of early modern humans. The sites are Wajak Cave, Song Gentong, and Tenggar Cave (Late Pleistocene to Early Holocene) located in the marble and limestone ornaments mining area of the Campurdarat Formation. Geoconservation of the geological heritage continues to be carried out by research or excavation in these fossil sites to reveal the past life and paleoenvironment, where the fossil site is susceptible to the threat of damage due to surrounded mining activities.Keyword: Wajak Cave, Song Gentong, Tenggar Cave, limestone, marble, Campurdarat Formation.

Protolith Oceanic Island Arc dari Granitoid Tipe M dan I di Karangsambung, Kebumen, Jawa Tengah Ansori, Chusni; Godang, Shaban; Hastria, Defry; isyqi, Isyqi
Jurnal Geologi dan Sumberdaya Mineral Vol 20, No 4 (2019): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

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

Petrology and Geochemistry of The Volcanic Arc Tarusan Pluton in Comparison to Lolo Pluton, West Sumatra Irzon, Ronaldo; Syafri, Ildrem; Agustiany, Irfani; Prabowo, Arief; Sendjaja, Purnama
Jurnal Geologi dan Sumberdaya Mineral Vol 20, No 4 (2019): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

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.

Studi Alterasi, Mineralisasi Dan Inklusi Fluida Prospek Hidrotermal (Pb-Zn-CuÂ±Au-Ag) Kubah Kulonprogo Bagian Selatan, Jawa Tengah Fadlin, Fadlin; Hajar Sulystiawan, Isnu; Adi Prasetyo, Luthfi
Jurnal Geologi dan Sumberdaya Mineral Vol 20, No 4 (2019): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

Ore potential especially base metals, gold and silver in the Kulonprogo Mountains have been a discussion of Indonesian geologists for a long time, until now its prospects as economic value has not been found, which made it a challenge to conduct an intensive and detailed study. This study is conducted to understand the mineralization-alteration characteristics and the deposit fluid of the study area. The method used in this study is a surface geological mapping, laboratory analysis such as mineragraphy, X-ray diffraction, ore geochemistry (Atomic Absorption Spectrometry-fire assay) and fluid inclusion. Alteration zone of the study area is divided into prophylitic, advanced argilic, argilic and silicification. Vein texture that develop in the study area is a massive quartz, stock work, and vuggy quartz which has NE-SW orientation, while the sulphide mineral abundance which found are enargite, pyrite, chalcopyrite, sphalerite, malachite, and molybdenite, occur in quartz veins or disseminated in gangue rock. Ore geochemistry AAS-fire assay of five vein samples show Au and the highest Ag content shown in sample 3 (Au:3.8. g/t, Ag:10 g/t). Fluid inclusion analysis results show homogenization temperature value (Th) which is 293,4-322,4o C, melting temperature (Tm) is -5,22o C until -6,3o C with average salinity value 10,58-12,89 wt,%NaCl equivalent. Hydrothermal fluid evolution of the study area is at the mixing with cooler phase and less saline fluids. Fluid is estimated from magmatic water that slowly mixed with meteoric water which is shown by the cooling temperature and salinity value. Based on alteration, mineralization, vein texture, ore geochemistry and fluid inclusion data results, therefore the deposit type at the study area is an intermediate epithermal sulphidation (IS).Keyword: alteration-mineralization, intermediate epithermal sulphidation, fluid inclusion, Kulonprogo Dome.

Evolusi Cekungan pada Periode Holosen Kaitannya dengan Fluktuasi Muka Air Laut, Tektonik dan Perubahan Iklim di Nabire dan Sekitarnya, Papua Moechtar, Rio Alcanadre Tanjung
Jurnal Geologi dan Sumberdaya Mineral Vol 20, No 4 (2019): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

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

Prediksi Model 2d Data Magnetotelurik Terbaik Berdasarkan Pendekatan Model Irisan Di Cekungan Tomori dan Sekitarnya Junursyah, Gusti Muhammad Lucki; Bagus Maulana, Dimas; Rusdiana, Randi
Jurnal Geologi dan Sumberdaya Mineral Vol 20, No 4 (2019): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

2D modeling of magnetotelluric data produce various models that are influenced by noise and differences in coordinate measurement systems with strike directions, so the results are inaccurate. A technique that can be done to identify the accuracy of the data is the rotation analysis based on the overlay model approach. The type of rotation used are strike angle and fix angle. The strike angle rotation is done by maximizing the anti-diagonal impedance value, while the rotation fix angle refers to the isotropic homogeneous earth model by eliminating the static effect on the surface. The overlay model approach is based on the assumption that the distribution of resistivity variations of the rock in the subsurface has same value in various models. 2D modeling used in this analysis consists of three trajectories of correlation results from 30 magnetotelluric measurement points in the Tomori and surrounding areas. The results of the analysis show that the strike angle rotation model is the best model that can be used in the study area with the approach of determination value reaches 0.7735, therefore it can reduce subsurface geological interpretation deviation based on various 2D models.Keywords: Magnetotelluric, impedance rotation, strike angle rotation, fix angle rotation

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