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Structure and Tectonic Reconstruction of Bayah Complex Area, Banten Ahnaf, Jemi Saputra; Patonah, Aton; Permana, Haryadi; Ismawan, Ismawan
Journal of Geoscience, Engineering, Environment, and Technology Vol 3 No 2 (2018): JGEET Vol 03 No 02 : June (2018)
Publisher : UIR PRESS

The research aimed to reconstruct the geological structures and tectonics of the Bayah complex area. The structures found that grouped into regional structural patterns used to determine the ages and the events that responsible to its formation. The methods used in this research include field and studio method. Field method carried out to map the outcrops and record geological structures data using geological compass, GPS, tape measurement, and geological hammer, while studio method performed to process and analyze data using software such as Win Tensor, Dips, MapInfo Professional 10.5 and CorelDraw X4. The geological structure of the Bayah has varying patterns and ages. The fracture patterns show N-S and E-W direction which is belong to Sundanese and Java Pattern formed in range of the Early Eocene to Pliocene. While the faults that have direction of SW-NE and E-W are classified into Meratus and Java Pattern. However, metamorphic rock foliations show NW-SE and N-S direction that belonging to the Pre-Tertiary Sumatra Pattern. The three faults of this research are estimated to be formed by the effect of orogenesis that occurring in different events and ages. JSA-014 fault is predicted to form due to orogeny I or orogeny II in the Early Oligocene - Middle Miocene, this fault classified as the 2nd order right lateral wrench fault. JSA-034 fault is formed by orogeny I in Early Oligocene - Middle Miocene, this fault is also classified as the 2nd order right lateral wrench fault. While JSA-080 fault has relatively young age that formed due to orogeny III in the Middle Miocene - Pliocene and belonging to the 3rd order left lateral wrench fault.

Structure and Tectonic Reconstruction of Bayah Complex Area, Banten Jemi Saputra Ahnaf; Aton Patonah; Haryadi Permana; Ismawan Ismawan
Journal of Geoscience, Engineering, Environment, and Technology Vol. 3 No. 2 (2018): JGEET Vol 03 No 02 : June (2018)
Publisher : UIR PRESS

The research aimed to reconstruct the geological structures and tectonics of the Bayah complex area. The structures found that grouped into regional structural patterns used to determine the ages and the events that responsible to its formation. The methods used in this research include field and studio method. Field method carried out to map the outcrops and record geological structures data using geological compass, GPS, tape measurement, and geological hammer, while studio method performed to process and analyze data using software such as Win Tensor, Dips, MapInfo Professional 10.5 and CorelDraw X4. The geological structure of the Bayah has varying patterns and ages. The fracture patterns show N-S and E-W direction which is belong to Sundanese and Java Pattern formed in range of the Early Eocene to Pliocene. While the faults that have direction of SW-NE and E-W are classified into Meratus and Java Pattern. However, metamorphic rock foliations show NW-SE and N-S direction that belonging to the Pre-Tertiary Sumatra Pattern. The three faults of this research are estimated to be formed by the effect of orogenesis that occurring in different events and ages. JSA-014 fault is predicted to form due to orogeny I or orogeny II in the Early Oligocene - Middle Miocene, this fault classified as the 2nd order right lateral wrench fault. JSA-034 fault is formed by orogeny I in Early Oligocene - Middle Miocene, this fault is also classified as the 2nd order right lateral wrench fault. While JSA-080 fault has relatively young age that formed due to orogeny III in the Middle Miocene - Pliocene and belonging to the 3rd order left lateral wrench fault.

Petrogenesis of Volcanic Arc Granites from Bayah Complex, Banten, Indonesia Jemi Saputra Ahnaf; Aton Patonah; Haryadi Permana
Journal of Geoscience, Engineering, Environment, and Technology Vol. 4 No. 2 (2019): JGEET Vol 04 No 02 : June (2019)
Publisher : UIR PRESS

This research aimed to reveal the petrogenesis of granitic rocks of Bayah Complex starting from magma differentiation to exposing event, this research also intended to determine the tectonic environment. The methods carried out in this research include field observation, petrographic analysis using polarized light microscopy, and geochemical analysis using X-Ray Fluorescence (XRF) and Inductively Coupled Mass Spectrometry (ICP-MS). Petrographic analysis shows that Bayah granitic rocks are composed of quartz, plagioclase, and K-feldspar while the rest are amphibole, biotite, sericite, chlorite, epidote, and opaque. Based on its major oxide concentrations, Bayah granitic rocks classified as granite and diorite-quartz which have high-K calc-alkaline magma. 4 samples of granitic rocks showed the A/N+K+C > 1 molar ratios belonging to the peraluminous S-type granite index while the remaining 1 sample showed a molar ratio of A/N+ K+C < 1 and A/N+K > 1 which classified as metaluminous I-type granite. Accordingly, Bayah granitic rocks are S-type granite which crystallized from sediment-derived magma, the sediments itself estimated sourced from continental especially Malay Peninsula, Indonesian Tin Island, and Schwaner Mountains. During differentiation, the magma undergone crustal contamination reflected by the increase in both SiO2 0.51 wt% and Al2O3 1.95 wt%, and decrease in Fe2O3 + MgO 0.61 wt% from the pure composition of sediment-derived magma. Furthermore, the occurrence of crustal contamination also recognized from high concentrations of Rb and Ba which indicate the interaction of magma with the materials of continental crust. Regard to the exposing event, Bayah granitic rocks approximated to be exposed due to regional tectonic activity which caused Orogenesa I in the Early Oligocene to the Late Oligocene. Moreover, based on the plot of trace elements especially Rb, Y, Nb, Ta, and Yb on Harker and tectonic discriminant diagrams, Bayah granitic rocks are formed on volcanic-arc active continental margins in accordance with regional tectonic setting.

The Transitional Gabbroic Rocks in Bayah Geological Complex, Western part of Java, Indonesia, Inferred from XRF, ICP-MS, and Microprobe Analysis Aton Patonah; Haryadi Permana; Ildrem Syafri
Journal of Geoscience, Engineering, Environment, and Technology Vol. 6 No. 4 (2021): JGEET Vol 06 No 04 : December (2021)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2021.6.4.7189

Gabbro, is a fossil remnant of oceanic crust in western part of Java, found at Bayah Geological Complex (BGC) and Ciletuh Melange Complex (CMC), Indonesia. It has been studied by using petrographic, X-Ray Fluorescence (XRF), and inductively coupled plasma-mass spectrometry (ICP-MS) and mineralogical (microprobe) analyses. Mineral and geochemical composition of these rocks provide important clues to their origins since the rocks have been deformed and gone through auto metamorphism, beside they contain the economic mineral and or rare earth elements (REE). Gabbroic rocks in these two areas generally shows phaneritic to porphyritic texture, granular texture. These rocks in CMC are dominated by plagioclase (oligoclase to albite), hornblende, pyroxene, partly altered to tremolite, actinolite, chlorite, epidote, and sericite; meanwhile those of BGC dominantly consist of plagioclase, pyroxene, hornblende, some present of chlorite, actinolite, epidote and biotite as secondary minerals. In multi-element diagrams, gabbroic rocks in CMC show strong negative Sr and Zr, but positive Nb anomaly, while those of BGC show strong negative anomaly of Nb and Zr. In addition, based on rare earth elements (REE) diagrams, gabbroic rocks in CMC show depleted of light rare earth elements (LREE) with negative Eu anomaly, while gabbro’s in BGC show enrichment of LREE. These characteristics indicate that GBC’s and CMC’s gabbroic rocks came from different magma sources, one was formed by partial melting of depleted upper mantle reservoir while the other one was formed by partial melting of mantle wedge with active participation of subducted slab in an arc tectonic setting, suprasubduction zone which were formed at started Upper Cretaceous to Paleogene, and they had retrograde metamorphism to epidote amphibolite facies.

PEMBERDAYAAN MASYARAKAT DESA CISEWU BERBASIS POTENSI LOKAL DALAM MEWUJUDKAN MASYARAKAT TANGGAP BENCANA Emi Sukiyah; Patonah Aton; Zakaria Zufialdi; Rina Devnita; Adjat Sudradjat; Edi Tri Haryanto; Dwi Purnomo
Dharmakarya Vol 7, No 2 (2018): Juni
Publisher : Universitas Padjadjaran

Desa Cisewu berada di Kabupaten Garut bagian selatan. Wilayah ini merupakan bentangalam perbukitan yang tersusun oleh material vulkanik berumur Kuarter. Struktur geologi berupa kekar dan sesar di kawasan tersebut menambah risiko lahan bersifat labil. Oleh karena itu wajar jika kawasan tersebut rawan gerakan tanah. Populasi penduduk berkembang pesat mengingat wilayah ini strategis. Apalagi wilayah Cisewu merupakan penghubung, antara Jawa Barat bagian tengah dan selatan. Sebagian masyarakat Desa Cisewu telah berulang kali mengalami kerugian akibat bencana longsor. Relokasi warga hampir sulit dilakukan, mengingat budaya masyarakat setempat yang sulit meninggalkan tanah leluhur. Masyarakat Desa Cisewu perlu diberdayakan agar mampu berdikari serta tanggap terhadap darurat bencana gerakan tanah. Pemberdayaan masyarakat dapat dilakukan dengan cara memberikan berbagai pelatihan dan pendampingan dengan metode yang mudah dipahami. Pemahaman wilayah yang labil bisa disisipkan pada berbagai kegiatan dalam rangka pemberdayaan masyarakat. Sosialisasi beragam fenomena alam terkait kebencanaan perlu dilakukan dengan bahasa yang sederhana dan sesuai dengan tingkat pendidikan masyarakat setempat. Di sisi lain, masalah konservasi kawasan rawan bahaya alam juga perlu disosialisasikan. Target masyarakat dapat dikelompokkan berdasarkan usia dan latar belakang pendidikan. Pengembangan usaha berbasis potensi lokal perlu mendapat perhatian khusus. Potensi lokal ini perlu mendapat pendampingan untuk dapat bersaing dengan produk unggulan di daerah lainnya.

KARAKTERISTIK ALTERASI BAWAH PERMUKAAN DI LAPANGAN PANAS BUMI “X”, KABUPATEN SUKABUMI, PROVINSI JAWA BARAT : CHARACTERISTICS ALTERATION OF SUB-SURVEY IN “X” GEOTHERMAL FIELD, SUKABUMI, WEST JAVA PROVINCE Flaurentina Nadya; Aton Patonah; Undang Mardiana; Mochammad Nurhadi
Buletin Sumber Daya Geologi Vol. 17 No. 3 (2022): 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.v17i3.356

Indonesia is one of the countries that has the largest geothermal potential in the world. One of them is located in Sukabumi Regency, West Java. In order to optimize geothermal potential, research on geothermal characteristics is needed, one of which is the study of alteration minerals in geothermal manifestations. This research is focused on alteration studies using coring and cutting data from the drilling of Well X. The sequence of rocks in Well X from oldest to younger succession consists of lake deposits, altered tuff, altered tuff breccias, altered dacite, altered andesite, altered andesite breccias and late volcanic breccias. which is divided into two volcanic periods, namely the Pliocene period from the eruption of Mount Citorek and the Pleistocene from the eruption of Mount Halimun and Mount Tapos. Based on the assemblage of alteration minerals, the alteration zone in Well X is divided into 3 zones, namely the smectite-chlorite zone at a depth of 24 to 600 MD, illite-chlorite zone at a depth of 600 to 700 MD, and the chlorite-smectite zone at a depth of 700 to 821 MD. Based on the mineral composition and alteration zone, the type of alteration in Well X is sub-prophylitic with neutral pH and temperature 200-300°C and can act as a containment zone and judging from the appearance of manifestations controlled by the structure, the study area is in the outflow zone.

TIPE ENDAPAN MINERAL PADA BATUAN METAMORF KUBAH BAYAH, BANTEN KHOLIS, NUR.; Patonah, Aton.; Barkah, Mochamad. Nursiyam
Bulletin of Scientific Contribution Vol 22, No 1 (2024): Bulletin of Scientific Contribution : GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc.v22i1.48948

Penelitian ini dilakukan di daerah Kubah Bayah, Kecamatan Cihara, Kabupaten Lebak, Provinsi Banten, dengan tujuan untuk mengidentifikasi karakteristik, jenis, asosiasi mineral ubahan, mineral logam, dan tipe endapan mineral pada batuan induk berupa batuan metamorf. Petrografi dan mineragrafi adalah metode yang digunakan dalam penelitian ini. Berdasarkan hasil petrografi, didapatkan 6 jenis batuan metamorf, yaitu sekis klorit, sekis biotit klorit, sekis muskvoit klorit, sekis biotit muskovit klorit, sekis garnet biotit muskovit klorit, dan sekis aktinolit klorit sebagai batuan induk. Berdasarkan hasil identifikasi mineral ubahan dan asosiasinya, alterasi daerah penelitian dibagi ke dalam 2 zona mineral alterasi, yaitu zona epidot – klorit ± kuarsa yang termasuk ke dalam tipe alterasi propilitik dan zona serisit ± pirit yang termasuk ke dalam tipe alterasi filik. Selanjutnya, hasil mineragrafi, menunjukkan bahwa terdapat 2 asosiasi mineralisasi logam bijih, yaitu pos-metamorfik dan sin-metamorfik. Mineral penyusun asosiasi mineralisasi pos-metamorfik terdiri atas pirit, kalkopirit, sfalerit, bornit, kovelit, dan hematit, sedangkan mineral penyusun asosiasi mineralisasi sin-metamorfik terdiri atas pirit. Selain itu, juga teridentifikasi mineral logam berharga berupa emas pada asosiasi mineral pos-metamorfik. Berdasarkan karakteristik di atas, maka tipe endapan yang terbentuk di daerah penelitian adalah didominasi oleh tipe endapan hidrotermal yaitu endapan epitermal sulfidasi menengah. Namun, sebagian kecil juga hadir, diduga sebagai endapan orogenik yang dicirikan oleh urat-urat paralel foliasi yang diisi oleh kuarsa sekunder, klorit sekunder, mineral lempung sekunder, dan mineral opak dan mineralisasi berupa mineral pirit yang terbentuk mengikuti foliasi pada mineral klorit.Kata kunci: Kubah Bayah, Zona alterasi – mineralisasi, batuan metamorf, epitermal sulfidasi menengah This research was conducted in the Bayah Dome area, Cihara District, Lebak Regency, Banten Province, with the aim of identifying the characteristics, types, associations of alteration minerals, metallic minerals, and types of metallic mineral deposits in metamorphic – hosted rocks. Petrography and mineragraphy are the methods used in this study. Based on the petrographic results, 6 types of metamorphic rocks were obtained, namely chlorite schist, chlorite biotite schist, chlorite muscovite schist, chlorite muscovite biotite schist, chlorite muscovite biotite garnet schist, and chlorite actinolite schist as the host rock. Based on the identification of alteration minerals and their associations, the alteration of the study area is divided into 2 zones of alteration minerals, namely the epidote - chlorite ± quartz alteration mineral zone which belongs to the propylitic alteration type and the sericite ± pyrite alteration mineral zone which belongs to the phyllic alteration type. Furthermore, mineragraphic results show that there are 2 ore metal mineralization associations, namely post-metamorphic and syn-metamorphic. The constituent minerals of the post-metamorphic mineralization association consist of pyrite, chalcopyrite, sphalerite, bornite, covellite and hematite, while the constituent minerals of the syn-metamorphic mineralization association consist of pyrite. In addition, valuable metal minerals in the form of gold were also identified in the post-metamorphic mineral association. Based on the above characteristics, the type of deposits formed in the study area is dominated by medium sulfidation epithermal deposits. However, a small part is also present, presumably as orogenic deposits characterized by foliation parallel veins filled with secondary quartz, secondary chlorite, secondary clay minerals, and opaque minerals and mineralization in the form of pyrite minerals formed following foliation on chlorite minerals.Keywords: Bayah Dome, Alteration-mineralization type, Metamorphic-hosted rock, Intermediate sulfide ephitermal

UMUR BATUAN SEDIMEN ANGGOTA CIKARANG FORMASI JAMPANG DI SUNGAI CIGANGSA, KECAMATAN SURADE, KABUPATEN SUKABUMI BERDASARKAN NANNOFOSIL GAMPINGAN Ramdhani, Muhammad Alfi Gilang; Pratiwi, Santi Dwi; Patonah, Aton
Bulletin of Scientific Contribution Vol 22, No 1 (2024): Bulletin of Scientific Contribution : GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc.v22i1.54443

Penelitian dilakukan pada batuan sedimen yang tersingkap di Sungai Cigangsa, Kecamatan Surade. Singkapan ini merupakan bagian dari Anggota Cikarang Formasi Jampang dengan susunan singkapan batuan di lapangan berupa batupasir dalam berbagai ukuran butir dan ketebalan dan batulempung. Secara stratigrafi, di bagian atas dan bawah disusun oleh batupasir karbonatan dengan ketebalan bervariasi antara 10 sampai 45 cm. Di bagian tengah disusun oleh batulempung dengan ketebalan 3 sampai 32 cm. Penelitian bertujuan untuk mengidentifikasi umur relatif batuan sedimen Anggota Cikarang Formasi Jampang di Sungai Cigangsa dengan menggunakan metode measuring section dan analisis nannofosil gampingan secara semi kuantitatif. Sebanyak 36 spesies nannofosil telah diidentifikasi dari 47 sampel batuan sedimen yang telah diamati dengan preparasi nannofosil metode smear slide. Enam datum marker spesies nannofosil yang dapat digunakan untuk rekonstruksi biostratigrafi dari tua ke muda yaitu kemunculan akhir Sphenolithus ciperoensis (Zona NP25), kemunculan akhir dari Cyclicargolithus abisectus (Zona NN1), kemunculan awal Sphenolithus disbelemnos (Zona NN2/NN1), kemunculan awal Sphenolithus belemnos (Zona NN3/NN2), kemunculan umum akhir dari Sphenolithus belemnos (Zona NN4/NN3), dan kemunculan umum awal Sphenolithus heteromorphus (Zona NN4). Dapat disimpulkan bahwa Anggota Cikarang Formasi Jampang memiliki rentang umur NP25-NN4 (Oligosen Akhir – Miosen Awal).

KARAKTERISTIK UNSUR TANAH JARANG (LTJ) LANTANUM DAN CERIUM PADA LAPUKAN GRANIT DI DAERAH PARMONANGAN Musyaffa, Muhammad Ayyasy; Patonah, Aton; Faisal, Reza Mochammad
JURNAL GEOMINERBA (JURNAL GEOLOGI, MINERAL DAN BATUBARA) Vol 9 No 1 (2024): Jurnal Geominerba - 2024
Publisher : PPSDM Geominerba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58522/ppsdm22.v9i1.157

As a critical mineral category, the demand for rare earth metals (LTJ) has increased significantly. Rare earth metals, Lanthanum (La) and Cerium (Ce), are utilized in a variety of contemporary technologies. Rare earth elements such as La and Ce are present in rare earth element-bearing minerals and can be found in granitoid-weathered deposits. The purpose of this study is to determine the characteristics of La and Ce elements conttained in ion adsorption deposits resulting from the weathering of granite boulders, as well as their relationship to other chemical elements. In this study, acid igneous rock weathering samples obtained from drilling in Parmonangan District, North Tapanuli Regency, North Sumatra were analyzed to identify La and Ce element-bearing minerals, enrichment zones, and types of rare earth element deposits. La is enriched in the rare earth element accumulation zone of the ion adsorption precipitate model, while Ce is enriched in the leaching zone, according to the findings of the investigation. This occurs as a result of the movement of La element during weathering, which is then bound by alteration minerals such as kaolinite. As a result of the oxidation process in the rare earth element leaching zone, the element Ce has a distinct ion value, resulting in limited mobility.

GEOLOGICAL STRUCTURE OF CITUNDUN AND SURROUNDING CIWARU DISTRICT, KUNINGAN REGENCY, WEST JAVA PROVINCE Arfiansyah, Kurnia; ICHSAN, MUHAMAD; Patonah, Aton
Journal of Geological Sciences and Applied Geology Vol 6, No 1 (2022): Journal of Geological Science and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v6i1.45212

Based on the Regional Geological Map of the Majenang sheet (Kastowo and Suwarna, 1996), the study area is part of the Halang Formation and the Bogor Zone (Van Bemmelen, 1949). Research conducted using the geological mapping method shows that the Citundun area and its surroundings have complex geological and tectonic structural conditions.The geological structures that develop are folds, joints and faults. The fold structure in the study area occurs during the Miocene – Pliocene transition with the main axis of the fold trending relatively northwest – southeast where from north to south, namely the Karangkancana Anticline, Kaduagung Syncline, Kaduagung Anticline, Cipari Syncline, Cipari Anticline, Sagara Syncline, Sagara Anticline, Jabranti Syncline, and Jabranti Anticline.Based on joint processing data and structural lineaments, the lineament results trending northwest-southeast and southwest-northeast. Joint structures are found in carbonate sandstones and carbonate claystones with hard and rather hard levels of hardness. In the study area, there are two strike slip fault structures, namely Sagara Sinistral Strike Slip Fault and Cipari Dextral Strike Slip Fault which are trending northeast-southwest. From the results of joint data analysis, a fault indication was withdrawn because the distribution of joint directions was supportive. Based on the regional tectonic age of West Java, during the Miocene - Pliocene the fault in the study area occurred after deposition of sandstone unit (Sbpn), carbonate claystone unit (Sblk) and carbonate sandstone unit (Sbpk) so that this fault structure is interpreted to be Pliocene in age. Referring to the concept of Moody and Hill (1956), the faults in the study area are strike slip faults of the first and second order.Keywords: Citundun, Geological Structure, Syncline, Anticline, Strike Slip Fault.

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