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PENDUGAAN TEMPERATUR BAWAH PERMUKAAN PADA MANIFESTASI PANAS BUMI BERDASARKAN ANALISIS GEOKIMIA AIR PANAS DAERAH KECAMATAN TEHORU, KABUPATEN MALUKU TENGAH, PROVINSI MALUKU Johanes Hutabarat, Dewi Gentana, Yusuf Mehdi Toisuta, Agus Didit H,
Geoscience Journal Vol 5, No 3 (2021): Padjadjaran Geoscience Journal
Publisher : Unpad

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/pgj.v5i3.35231

Daerah penelitian berada di Desa Tehoru, Kabupaten Maluku Tengah, ProvinsiMaluku. Secara geografis terletak pada koordinat 129°30’25,05” -129°33’37,59” BTdan 3°21’37,05”-3°24’50,25”LS, dipilih sebagai lokasi penelitian karena terdapatmanifestasi panas bumi permukaan berupa mata air panas. Tujuan penelitian untukmengetahui karakteristik fluida panas bumi dan perkiraan temperatur bawahpermukaan. Penelitian ini menggunakan dua metode yaitu pengamatan lapangan dananalisis berdasarkan data hasil laboratorium kimia mata air panas (THR-1, THR-2 danTHR-3). Hasil ploting rasio unsur kimia mata air panas pada diagram segitiga Cl-SO4-HCO3 memperlihatkan ketiga mata air panas termasuk tipe air bikarbonat pada kondisi“pheripiral waters” dengan kandungan HCO3 dominan. Hasil ploting rasio unsur kimiadari mata air panas pada diagram segitiga Cl-Li-B memperlihatkan ketiga mata airpanas di posisi tengah diagram segitiga Cl, Li dan B. Rasio unsur Cl dan B relatifseimbang, dengan kandungan Li yang rendah, dikarenakan Li mudah terserap olehmineral sekunder seperti klorit, kuarsa dan lempung, akibat reaksi dengan batuansamping yang dilaluinya saat fluida bergerak ke permukaan. Hasil ploting rasio unsurkimia dari mata air panas pada diagram segitiga Na-K-Mg memperlihatkan ketiga mataair panas terbentuk pada kondisi “partial equilibrium” mengindikasikan mata air panasyang muncul ke permukaan dipengaruhi oleh interaksi antara fluida dengan batuandalam keadaan panas bercampur dengan air permukaan. Hasil perhitungan denganmenggunakan persamaan geotermometer fluida terhadap ke tiga sampel mata air panasdiperkirakan memiliki temperatur reservoar, 129˚C-175 ˚C (sistem panas bumi bersuhusedang).

IDENTIFIKASI ZONA PROSPEK PANAS BUMI MENGGUNAKAN DIGITAL ELEVATION MODEL DENGAN METODE DENSITAS KELURUSAN DAN TEMPERATUR SUHU PERMUKAAN DI DAERAH SEULAWAH, PROVINSI ACEH Johanes Hutabarat, Muhammad Ronggour Pardamean Siahaan, Audi Farhan, Agus Didit Haryanto,
Geoscience Journal Vol 5, No 1 (2021): Padjadjaran Geoscience Journal
Publisher : Unpad

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/pgj.v5i1.35213

Pada penelitian ini, daerah yang diteliti adalah potensi panas bumi di daerah Seulawah,Provinsi Aceh. Penelitian ini dilakukan menggunakan teknik penginderaan jauh dalammengetahui zona prospek panas bumi tahap awal. Dengan menggunakan data citra DEMNASuntuk mengetahui denistas kelurusan daerah penelitian yang diasumsikan nilai densitas tinggimerupakan zona permeabel yang memungkinkan munculnya manifestasi ke permukaan.Serta data citra Landsat 8 untuk mengetahui kerapatan vegetasi dan suhu permukaan tanahpada daerah penelitian yang nantinya digunakan untuk mendapatkan anomali temperaturpermukaan. Hasil penelitian menunjukan bahwa zona prospek pada daerah penelitian beradapada daerah Timur dari manifestasi Ie Suum dengan memiliki densitas kelurusan yang tinggi,suhu permukaan sedang sampai tinggi pada kerapatan vegetasi rapat sampai sedang denganestimasi luas reservoir 1.55 km2.Kata kunci: Panas bumi, Penginderaan Jauh, Gunung Seulawah Agam, Suhupermukaan, Densitas Kelurusan

KARAKTERISTIK GEOKIMIA AIR PANAS DAN PERKIRAAN TEMPERATUR BAWAH PERMUKAAN PANAS BUMI DAERAH OMA DAN TULEHU KABUPATEN MALUKU TENGAH Johanes Hutabarat , Dewi Gentana, William Simon Tala, Agus Didit Haryanto
Geoscience Journal Vol 4, No 4 (2020): Padjadjaran Geoscience Journal
Publisher : Unpad

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/pgj.v4i4.32173

Desa Oma, Kecamatan pulau Haruku dan Desa Tulehu, Kecamatan Salahutu pulau Ambon, Kabupaten Maluku Tengah, Provinsi Maluku. Kedua daerah penelitian tersebut memiliki mata air panas di permukaan yang diperkirakan dari suatu sistim panas bumi, analisis geokimia air dilakukan untuk mengetahui karakteristik mata air panas, jenis air panas, asal air panas dan temperatur bawah permukaan di daerah penelitian. Hasil ploting data laboratorium kimia air panas pada diagram segitiga Cl-SO4-HCO3 dari mata air panas, memiliki tipe air klorida-bikarbonat pada kondisi “mature waters”, terbentuk pada kondisi “absorption of low B/Cl steam” mendekati puncak Cl, menunjukkan mata air panas tersebut sedikit sekali dipengaruhi oleh aktifitas gunung api muncul ke permukaan pada zona outflow, tetapi daerah penelitian tidak memiliki gunung api indikasi Cl yang tinggi diduga dikarenakan hasil kontaminasi dengan air laut mengingat daerah pengambilan sampel tidak jauh darih daerah pantai. Hasil dari ploting rasio Na-K-Mg, menunjukkan mata air panas OMA-1 terbentuk pada kondisi partial water, mata air panas THU-1 dan THU-2 berada kondisi “immature waters” dengan kandungan Mg yang tinggi. Hasil perhitungan menggunakan persamaan geotermometer fluida (air) terhadap sampel mata air panas di daerah penelitian diperkirakan memiliki temperatur bawah permukaan 134,09°C - 251°C.Kata Kunci : Panas bumi, Geokimia, Temperatur

PETROGRAFI BATUAN BEKU VOLKANIK BAWAH LAUT KOMPLEKS GUNUNG KOMBA, LAUT FLORES, INDONESIA -, Johanes Hutabarat; -, Agus Didit Haryanto; -, L. Sarmili
Bulletin of Scientific Contribution Vol 4, No 1 (2006): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

This study focuses on the petrography characteristics of the volcanic rocks in Mount Komba, Flores Sea, Nusa Tenggara Timur.Based on textural and mineralogical characteristics, volcanic rocks Mount Komba are composed of andesite-basaltic lava flows. It is chiefly porphyritic, intergranular, intersertal to glomeroporphyritic clots textures that contains variable proportion of plagioclase, pyroxene, biotite, hornblende and opaque oxide minerals phenocryst in very fine grained groundmass contains clinopyroxene, plagopclase laths, devitrified glass and opaque oxide minerals. Plagioclase phenocrysts show sieve-textured cores, opaque inclusions, compositional zoning, and skeletal melt pockets. Pyroxenes are strong zones with rims. Some are poikilitic. Biotite commonly exhibits a deep russet color parallel to its slow ray, the perpendicular direction being light to medium yellow brown. Some are altered to an asseblage of chlorite and finely granular opaque oxide minerals. Hornblende is perhaps slightly less abundant than biotite and occurs typically in euhedral to subhedralo crystals. It is pleochroic in shade of olive green and brownish yellow, rarely exhibiting a bright apple-green shade. Among the accessory minerals, opaque oxide minerals occurs as euhedral wedge-shape or blocky to slightly rounded, broken grains are common and also as a fine grainded alteration product associated with chlorite, formed from biotite and hornblende. Fresh glass is present, though in most cases the glass is devitrified.Some Mount Komba volcanic rocks studied exhibit varying degrees of propylitic or sericitic alteration. Feldspars plagioclase in particular, in most of the intensely hydrothermally altered Mount Komba volcanic rocks have been replaced by fine grained sericite, clay minerals, carbonate, chlorite, epidote and opaque oxide minerals.

STUDI GEOKIMIA BATUAN VULKANIK PRIMER KOMPLEKS GUNUNG SINGA - GUNUNG HULU LISUNG, BOGOR - JAWA BARAT -, Johanes Hutabarat
Bulletin of Scientific Contribution Vol 5, No 3 (2007): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

The research about study on geochemistry volcanic rocks of Gunung Singa - Gunung Hulu Lisung, Nanggung, Bogor, West Java.Samples of the Gunung Singa-Gunung Hulu Lisung were extensively analyzed for major oxides and trace elements. Compositions of geochemical samples have been plotted and are used in drawing petrogenetic inferences. volcanic rocks Gunung Singa - Gunung Hulu Lisung belong to the medium calc-alkalic to high Calc-alkalic dacite suite, and have SiO2 contents in the range of 61,34-68,55%, high Al2O3 (14,99-19,63%) and low TiO2 content and relatively high K2O (1,90-2,55%)Oxide variation diagrams for the Gunung Singa-Gunung Hulu Lisung show linear trend with much scatter. This is partially due to the fact that SiO2 makes up an increasing percentage of silicic rocks allowing less scatter in the other oxides. However, we suggest that mich of the scatter is due to mixing of variably fractionated basaltic magma with silicic magma

STUDI PETROGRAFI BATUAN BEKU GUNUNG SINGA BOGOR - JAWA BARAT -, Johanes Hutabarat; -, Mulyono
Bulletin of Scientific Contribution Vol 5, No 3 (2007): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

This research about study on petrography of igneous rocks (dacitic) of Gunung Singa, Nanggung, Bogor, West Java.Results of petrography and chemical analysis of these igneous rocks indicates that volcanics rock (lava) as dacite.Petrographic description of dacite show by porphyritic textures with plagioclase and pyroxene minerals as phenocryst. Mineralogical composition of these rocks consist of plagioclase, pyroxen, K-Felsdpar, amfibole, and opaque minerals, and secondary minerals like chlorite, clay minerals, epidote and opaque minerals.

INTERPRETASI GEOKIMIA UNSUR UTAMA DAN JEJAK KOMPLEKS VOLKANIK GUNUNG PONGKOR KABUPATEN BOGOR, JAWA BARAT -, Johanes Hutabarat
Bulletin of Scientific Contribution Vol 4, No 1 (2006): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

The research about study on geochemistry igneous rocks of Gunung Pongkor, Bogor, West Java. Basuki, et al., (1994) summarized the geology of the Pongkor areas consists of pyroclastic rocks (breccias and tuff) and lava flows and domes. Some problem to identifications which can in this research shall be as follows : How chemical composition and rocks afinity and also its evolution of exist in Mount Pongkor area have typical marking?.Samples of the Gunung Pongkor were extensively analyzed for major oxides and trace elements. Compositions of geochemical samples have been plotted and are used in drawing petrogenetic inferences. Igneous rocks Gunung Pongkor belong to the medium calc-alkalic to high Calc-alkalice suites (Peccerillo and Taylor; 1976), and have SiO2 contents in the range of 61,34-68,55%, middle and TiO2 and Al2O3 successively high (14,99-19,63%) and lower (< 0,50%); while K2O range from 1,90-2,55%. Other characteristic is the existence of some example of more enriched in Rb content and Ba. This Enrichment is also expressed by K2O content which relative higher. Than Ni element content and low Cr, and also Mg number ([Mg#]) less than 65, designate that its rock is not primitive, or equally experience of larger ones crystal fraksinasi from its mains magma.

KARAKTERISASI MINERALISASI TEMBAGA-EMAS BERDASARKAN GEOKIMIA MULTIUNSUR DENGAN METODE K-MEANS DAN ANALISIS KOMPONEN UTAMA, TOGURACI, INDONESIA: CHARACTERIZATION OF COPPER-GOLD MINERALIZATION BASED ON MULTIELEMENT GEOCHEMISTRY WITH K-MEANS AND PRINCIPAL COMPONENT ANALYSIS METHODS, TOGURACI, INDONESIA irwanda, Dharma; Mega F Rosana; Johanes Hutabarat
Buletin Sumber Daya Geologi Vol 19 No 2 (2024): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v19i2.466

Multielement geochemical data processing with K-means and principal component analysis was carried out in the Toguraci, part of the Gosowong gold mine contract of work in North Halmahera Regency, North Maluku Province. Previous research has suggested that there is overprinting low sulphidation epithermal Au-Ag mineralization and Cu-Au porphyry. This research focused on 2 selected drill holes with a total of 540 samples that were analyzed for Au and 46 other geochemical elements. The purpose of this research is to determine the characteristics of the copper-gold mineralization, and its host rock with multielement geochemical analysis, in order to provide a guide for exploration activities. Multielement geochemical data processing with K-means produced 3 lithogeochemical clusters based on their immobile element composition, namely basalt and diorite which are the host rocks, and quartz vein. Principal component analysis shows consistent results for the 3 clusters, where the combination of PC1 and PC2 which cumulatively represented 46,32% of the variance, indicates high and low loading scores describing the association of immobile elements that separates basalt, diorite and quartz vein. Data simplification with 7 principal components (P1-PC7) representing 73,62% of the variance has produced 6 geological domains which have their respective geochemical characteristics, namely Quartz vein, Basalt-1, Basalt-2, Diorite-1, Diorite-2, and Diorite-3. Copper mineralization is found in Basalt-1 and Diorite-1 related to porphyry type that has characteristics of Mo-Cu-Re-Ge-Au elemental association. While gold mineralization is found in the Quartz vein domain related to low sulphidation epithermal type which is characterized by Ag-Sb-Te-Au-Tl-Bi-As-Pb-Se-In elemental association.

KARAKTERISASI MINERALISASI TEMBAGA-EMAS BERDASARKAN GEOKIMIA MULTIUNSUR DENGAN METODE K-MEANS DAN ANALISIS KOMPONEN UTAMA, TOGURACI, INDONESIA: CHARACTERIZATION OF COPPER-GOLD MINERALIZATION BASED ON MULTIELEMENT GEOCHEMISTRY WITH K-MEANS AND PRINCIPAL COMPONENT ANALYSIS METHODS, TOGURACI, INDONESIA irwanda, Dharma; Mega F Rosana; Johanes Hutabarat
Buletin Sumber Daya Geologi Vol 19 No 2 (2024): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47599/bsdg.v19i2.466

Multielement geochemical data processing with K-means and principal component analysis was carried out in the Toguraci, part of the Gosowong gold mine contract of work in North Halmahera Regency, North Maluku Province. Previous research has suggested that there is overprinting low sulphidation epithermal Au-Ag mineralization and Cu-Au porphyry. This research focused on 2 selected drill holes with a total of 540 samples that were analyzed for Au and 46 other geochemical elements. The purpose of this research is to determine the characteristics of the copper-gold mineralization, and its host rock with multielement geochemical analysis, in order to provide a guide for exploration activities. Multielement geochemical data processing with K-means produced 3 lithogeochemical clusters based on their immobile element composition, namely basalt and diorite which are the host rocks, and quartz vein. Principal component analysis shows consistent results for the 3 clusters, where the combination of PC1 and PC2 which cumulatively represented 46,32% of the variance, indicates high and low loading scores describing the association of immobile elements that separates basalt, diorite and quartz vein. Data simplification with 7 principal components (P1-PC7) representing 73,62% of the variance has produced 6 geological domains which have their respective geochemical characteristics, namely Quartz vein, Basalt-1, Basalt-2, Diorite-1, Diorite-2, and Diorite-3. Copper mineralization is found in Basalt-1 and Diorite-1 related to porphyry type that has characteristics of Mo-Cu-Re-Ge-Au elemental association. While gold mineralization is found in the Quartz vein domain related to low sulphidation epithermal type which is characterized by Ag-Sb-Te-Au-Tl-Bi-As-Pb-Se-In elemental association.

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