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INDONESIA
BULLETIN OF THE MARINE GEOLOGY
Published by Marine Geological Institute of Indonesia
ISSN : 14106175     EISSN : 25278843     DOI : -
Core Subject : Science,
Earth & Planetary Sciences
Bulletin of the Marine Geology is a scientific journal of Marine geoscience that is published periodically, twice a year (June and December). The publication identification could be recognized on the ISSN 1410-6175 (print) and e-ISSN: 2527-8843 (on-line) twice a year (June & December) and it has been accredited by Lembaga Ilmu Pengetahuan Indonesia (Indonesian Institute of Sciences) by Decree Number: 818/E/2015. As an open access journal, thus all content are freely available without any charge to the user. Users are allowed to download, and distribute the full texts of the articles without permission from the publisher.
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Articles 5 Documents
 1 
Search results for , issue "Vol 35, No 2 (2020)" : 5 Documents clear
Simple Statistical Testing on Existing Data of Core 39 KL SO189/2 to Reveal its Correlation Towards Sea Surface Temperature Variation Taufan Wiguna; Khoiril Anwar Maryunani; Mirzam Abdurrachman; Yusuf Surachman Djajadihardja
BULLETIN OF THE MARINE GEOLOGY Vol 35, No 2 (2020)
Publisher : Marine Geological Institute of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32693/bomg.35.2.2020.682

Abstract

Several paleotemperature proxies using marine core sediment data have been developed and well-proven, but they need excellent laboratory handling and destructive tools. Spectrophotometer and Multi-Sensor Core Logger (MSCL) is considered rapid and non-destructive tools compared to other climate proxies. This paper enhances the correlation between existing data of spectrophotometer, MSCL, and sea surface temperature (SST) of the sediment core 39 KL from SO189/2 through a statistical test. The dataset is processed using interpolation, Pearson correlation, and K-means clustering. Pearson correlation reveals a strong correlation between spectrophotometer, MSCL, and SST. K-means clustering points out that SST is shifting from relatively colder to warmer. This study also tries to understand the source of four tephra and one terrigenous layer. It can be concluded that the spectrophotometer and MSCL have a positive correlation to SST variation. Keywords: statistical approach, existing data of SO189/2, spectrophotometer, Multi-Sensor Core Logger, sea surface temperatureBeberapa proksi paleotemperature menggunakan sedimen inti laut telah dikambangkan dan terbukti baik, namun membutuhkan penanganan laboratorium yang bagus dan bersifat destruktif. Spektrofotometer dan Multi Sensor Core Logger (MSCL) relatif lebih cepat dan tidak destruktif. Makalah ini membahas hubungan antara spektrofotometer, MSCL, dan temperature muka laut (SST) berdasarkan data sedimen inti 39 KL dari SO189/2 melalui pendekatan statistik. Data diolah menggunakan metode interpolasi, korelasi Pearson, dan kluster K-means. Korelasi Pearson menunjukkan korelasi kuat antara spektrofotometer, MSCL, dan SST. Kluster K-means menunjukkan pergeseran SST dari kondisi yang lebih dingin ke lebih hangat hubungan Stufi ini juga mencoba untuk memahami sumber 4 lapisan tefra dan 1 lapisan mineral terrigenous. Melalui studi ini, dapat disimpulkan bahwa spektrofotometer dan MSCL mempunyai korelasi positif terhadap variasi SST.Kata Kunci: Pendekatan statistik, Data existing SO189/2, spektrofotometer, Multi Sensor Core Logger, Suhu Permukaan Laut
Study of Granitoid Distribution at Toboali Waters, Bangka Belitung Province: Seismic data interpretation approach Muhammad Zulfikar; Noor Cahyo Dwi Aryanto; Andi Agus Nur; Ildrem Syafri
BULLETIN OF THE MARINE GEOLOGY Vol 35, No 2 (2020)
Publisher : Marine Geological Institute of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32693/bomg.35.2.2020.681

Abstract

Bangka Island is one of the islands in Indonesia which is traversed by Southeast Asia granitoid belt. This belt stretches from Burma (Myanmar) to Bangka Belitung. This granitoid has potential as a source rock of mineral that carrying tin and rare earth element. At present, mapping of granitoid rocks to the waters area is rarely published, so acoustic basement mapping is necessary to do in order to determine the distribution of granitoids in Toboali waters. The research method used is a single channel seismic with an energy source of 300 joules. The sound source uses a single plate boomer, so it has a high enough resolution but the penetration is not deep enough. Acoustic basement in Toboali waters varies in depth from 15 - 75 ms or getting deeper south. When viewed from the continuity of the acoustic basement, it is estimated that the granitoid is 7 km from the nearest coastline.Key words: single channel seismic, seismic interprtation, granitoid distribution, Toboali Waters, Bangka Belitung ProvincePulau Bangka merupakan salah satu pulau di Indonesia yang dilalui oleh jalur granitoid Asia Tenggara. Jalur ini membentang dari Burma (Myanmar) hingga Bangka Belitung. Granitoid ini memiliki potensi sebagai batuan sumber pembawa mineral timah dan unsur tanah jarang. Pada saat ini pemetaan batuan granitoid pada daerah perairan jarang dipublikasikan, sehingga pemetaan batuan dasar akustik perlu dilakukan dalam rangka mengetahui sebaran granitoid di Perairan Toboali. Metode penelitian yang digunakan yaitu seismik single channel dengan sumber energi yang dikeluarkan sebesar 300 joule. Sumber suaranya menggunakan boomer single plate, sehingga memiliki resolusi yang cukup tinggi akan tetapi penetrasinya tidak cukup dalam. Batuan dasar akustik di Perairan Toboali memiliki kedalaman bervariasi mulai dari 15 – 75 ms atau semakin ke selatan semakin dalam. Jika dilihat dari kemenerusan batuan dasar akustiknya diperkirakan granitoid tersebut berada 7 km dari garis pantai terdekat.Kata kunci: Seismik single channel, interpretasi seismik, distribusi granitoid, Perairan Toboali, Provinsi Bangka Belitung
Estuary Changes of Cipunagara and Cimanuk River Using Landsat Imagery Spatial Analysis Wawan Hendriawan Nur; Marfasran Hendrizan; Ayu Utami Nurhidayati; Ahmad Fauzi Ismayanto
BULLETIN OF THE MARINE GEOLOGY Vol 35, No 2 (2020)
Publisher : Marine Geological Institute of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32693/bomg.35.2.2020.690

Abstract

The north coastal Java located in the West Java, especially in Cirebon, Indramayu, and Subang, occurs loss and forming new land by abrasion and accretion processes. Observation using satellite imagery can be used as an initial stage to determine the distribution of abrasion and accretion around the north coastal area. Observation of land changes was assigned using Landsat imagery from 1978 to 2020. The result shows that inland change was controlled by abrasion and accretion. It is occurred in Indramayu and Subang, especially in several areas around large rivers e.g. Cipunegara and Cimanuk Rivers. Estuary changes in the Cipunegara and Cimanuk Rivers were controlled by the high flux sediment deposition of the river mouths affecting the new land forming due to the accretion process. Monitoring through Landsat satellite imagery on the Cipunagara River from 1978 to 2020 shows that there was 205 Ha of new land. Remote sensing analysis in the Cimanuk River area shows that the estuary line from 1978 to 2020 experienced accretion or new land forming for 629 Ha.Keywords: North coastal Java, accretion, Landsat, river estuary analysis, Cipunegara River, Cimanuk RiverKawasan pantai utara Jawa di Jawa Barat, khususnya daerah Cirebon, Indramayu, dan Subang, memiliki permasalahan hilang atau terbentuknya daratan baru melalui proses abrasi dan akresi. Pengamatan mengunakan citra dapat dijadikan tahapan awal untuk mengetahui sebaran abrasi dan akresi di sekitar wilayah pantai utara. Observasi perubahan daratan dilakukan dengan menggunakan citra landsat tahun 1978 dan 2020. Hasilnya memperlihatkan bahwa telah terjadi perubahan daratan, baik proses abrasi maupun akresi, di beberapa wilayah di sekitar muara-muara sungai besar seperti Sungai Cipunegara dan Sungai Cimanuk. Perubahan muara Sungai Cipunegara dan Sungai Cimanuk lebih disebabkan oleh tingginya pengendapan sedimen pada muara sungai tersebut dan membentuk lahan baru karena proses akresi. Pemantauan melalui citra satelit di Sungai Cipunagara data citra tahun 1978 sampai 2020 memperlihatkan penambahan lahan baru sebanyak 205 H. Analisis remote sensing citra di wilayah Sungai Cimanuk terlihat garis muara pantai pada tahun 1978 hingga tahun 2020 mengalami akresi atau penambahan lahan baru 629 H.Kata Kunci: Pantai utara Jawa, akresi, Landsat, analisis muara sungai, Sungai Cipunegara, Sungai Cimanuk
Application of Spectral Decomposition and RGB Blending for Delineation of “S” Channel At Asri Basin Swasty Aninda Piranti; Shaska Zulivandama; Noor Cahyo Dwi Aryanto; Andi Agus Nur; Ildrem Syafri
BULLETIN OF THE MARINE GEOLOGY Vol 35, No 2 (2020)
Publisher : Marine Geological Institute of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32693/bomg.35.2.2020.688

Abstract

Gita member is part of Talang Akar Formation is known as hydrocarbon reservoir at Asri Basin, eastern part of South Sumatra. This formation consists of several depositional systems such as braided channel, meandering channel, fluvial-deltaic, and estuarine system. A channel system was an interesting system developed in the Asri Basin, however, to get the channel distribution in Asri Basin is quite challenging because the thickness of the channels caused its appearance is generally close or under seismic resolution, the existence of coal below our target also affects the impression of “S” sand on seismic data. In this study, spectral decomposition and RGB Blending have been successful to identify “S” sand. RGB Blending map is extracted from 15 Hz as low frequency, 45 Hz as middle frequency, and 75 Hz as high frequency. Our interpretation was applied at RGB Blending map and reveal the “S” sand is classified as a meandering channel depositional system with the main direction of the channel is Northeast – Southwest.Keywords: spectral decomposition, RGB Blending, Gita reservoir, Asri Basin: Anggota Gita merupakan bagian dari Formasi Talang Akar yang dikenal sebagai reservoar hidrokarbon di Cekungan Asri, Sumatra Selatan bagian timur. Formasi ini terdiri dari beberapa sistem pengendapan seperti sistem sungai teranyam, meander, fluvial-delta, dan estuari. Sistem pengendapan sungai purba di Cekungan Asri merupakan sistem yang menarik untuk dieksplorasi namun untuk mendapatkan persebaran sungai tersebut merupakan hal yang menantang dikarenakan tipisnya ketebalan sungai yang mengakibatkan kenampakannya pada data seismik berada disekitar atau bahkan dibawah resolusi seismik, keberadaan lapisan batubara dibawah target turut mempengaruhi kenampakan pasir “S” pada data seismik. Dekomposisi spektral serta RGB Blending yang diaplikasikan pada penelitian ini dapat mengidentifikasi pasir “S”. Peta RGB Blending diekstraksi dari beberapa frekuensi, yaitu frekuensi 15 Hz yang diambil sebagai frekuensi rendah, 45 Hz sebagai frekuensi tengah, dan 75 Hz sebagai frekuensi tinggi. Selanjutnya dilakukan interpretasi pada peta hasil RGB Blending dan menunjukkan pasir “S” diklasifikasikan sebagai sungai dengan sistem meander dengan arah utama sedimentasi adalah Timurlaut - Baratdaya.Kata kunci: dekomposisi spektral, RGB Blending, reservoar Gita, Cekungan Asri 
Tectonics of Volcanogenic Massive Sulphide (VMS) Deposits at Flores Back Arc Basin: A Review Noor Cahyo Dwi Aryanto; Hananto Kurnio
BULLETIN OF THE MARINE GEOLOGY Vol 35, No 2 (2020)
Publisher : Marine Geological Institute of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32693/bomg.35.2.2020.679

Abstract

The bathymetry, petrology, marine magnetic, and seismic-SBP data have identified the northwest-southeast direction submarine ridge that shows hydrothermal activity. This activity occurred through Mount Baruna Komba, Abang Komba, and Ibu Komba. The volcanic rocks are andesite basaltic lava flows, tuff, and pumice. The andesite basaltic lava shows porphyritic, intergranular, intersertal to glomeroporphyritic textures. The rock composes anhedral minerals of k-feldspar, plagioclase, and pyroxene. These minerals present in small-sized, short prismatic dispersed in very fine groundmass minerals or glasses. Most of the volcanic rocks have experienced various degrees of alteration. The k-feldspar and plagioclase are most dominantly transformed into sericite, clay mineral, carbonate, epidote and oxide mineral, opaque mineral, and secondary plagioclase through the albitization process, while pyroxene replaced by chlorite. Other minerals are biotite and quartz, and base metals are present Cu, Zn, Ag, As, Pb, and gold. Mineralization categorizes as the phyllic zone, sub-prophylithic zone, and phyllic-potassic zone that formed at a temperature range of 250-400oC. The submarine hydrothermal alteration in the Komba Ridge is associated with a volcanogenic sulphide deposit controlled by crust thinning due to the crust rifts in the back-arc tectonic setting.Keywords: volcanic rocks, submarine hydrothermal alterations, Komba ridge, volcanogenic massif sulphide (VMS), back-arcData batimetri, petrologi, magnetic laut dan seismic-SBP telah memetakan dan mengidentifikasi suatu punggungan bawahlaut berarah baratlaut-tenggara yang memperlihatkan aktifitas hidrotermal bawah laut. Aktifitas tersebut muncul melalui Gunung Baruna Komba, Abang Komba dan Ibu Komba. Batuan gunungapi penyusun adalah aliran lava andesit basaltic, tuf dan pumis. Lava andesit basaltik memperlihatkan tekstur porfiritik, intergranular, intersertal to glomeroporfiritik. Mineral penyusun berupa k-felspar, plagioklas, dan piroksen dalam bentuk mineral anhedral, prismatik pendek berukuran kecil yang berada dalam masa dasar mineral sangat halus atau gelas. Batuan vulkanik telah mengalami ubahan dalam berbagai tingkat, dimana k-flespar dan plagioklas paling dominan terubah menjadi serisit, lempung, karbonat, epidot dan mineral oksida, opak atau plagioklas sekunder melalui proses albitisasi sedangkan piroksen mengalami proses ubahan digantikan oleh klorit. Mineral ubahan lainnya adalah biotit dan kuarsa dan logam dasar seperti Cu, Zn, Ag, As, Pb, dan emas. Mineralisasi dikategorikan sebagai zona filik, zona sub-profillitik, dan zona filik-potasik yang terbentuk pada kisaran suhu 250-400oC. Alterasi hidrotermal bawah laut di Punggungan Komba berasosiasi dengan suatu endapan sulfida volkanogenik yang dikontrol oleh penipisan kerak akibat peregangan kerak dalam tatan tektonik busur belakang.Keywords: batuan gunungapi, alterasi hidrotermal bawah laut, punggungan Komba, sulfida massif vulkanogenik, busur belakang

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