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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 26, No 1 (2011)" : 5 Documents clear
ABRASION WAVE OBSTRUCTS TOURISM DEVELOPMENT IN COASTAL REGIONS OF BINUANGEUN, LEBAK - BANTEN Delyuzar Ilahude; Udaya Kamiludin
BULLETIN OF THE MARINE GEOLOGY Vol 26, No 1 (2011)
Publisher : Marine Geological Institute of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (515.94 KB) | DOI: 10.32693/bomg.26.1.2011.34

Abstract

Geographically, the study area is located in the southern coast of Java and also exposed to the influence of wave energy from the southeast, south and southwest. The energy flux of waves generated by surface wind components that affect the coastline and the surrounding waters of Binuangeun. The impact of the wave coming from southeast direction caused a continuous abrasion process in Binuangeun coast and its adjacent areas, included the tourism area in the eastern part of Binuangeun coast towards the center of the study area. The current movement along the coast was accompanied by sediments deposition which tends to westward. The value of sediments supply (Vq) in sample area point number 9 was bigger than the sample area number 4 about 33.703 m3/year within the same direction tendency of sediments deposition. Western part of Binuangeun coastal area would presumably become the sediment accumulation point throughout the year, while the erosion process in the central part of the study area were expanding and occured seasonally. Keywords : abrasion, Binuangeun, flux energy Secara geografis daerah penelitian terletak di pesisir selatan Pulau Jawa dan termasuk pantai terbuka terhadap pengaruh energi gelombang dari arah tenggara, selatan dan barat daya. Energi fluks gelombang yang dibangkitkan oleh komponen angin permukaan berpengaruh terhadap garis pantai perairan Binuangen dan sekitarnya. Efek gelombang dari arah tenggara mengakibatkan proses abrasi di pantai Binuangen dan sekitarnya, terutama kawasan wisata bagian timur pantai Binuangen hingga ke bagian tengah. Pergerakan arus sepanjang pantainya disertai oleh pengendapan sedimen yang cenderung mengarah ke barat. Nilai pasokan sedimen (Vq) pada titik tinjau 9 lebih besar dari pada di titik 4 yaitu sebesar 33.703 m3/tahun dengan pasokan sedimen cenderung bergerak ke arah barat. Daerah pesisir kawasan bagian barat Binuangen diperkirakan akan menjadi zona akumulasi sedimen sepanjang tahun, sementara proses erosi di bagian tengah daerah penelitian tetap berkembang dan berlangsung secara musiman. Kata kunci : abrasi, Binuangen, energi fluks
IDENTIFICATION OF HARD ROCK BASED ON SHALLOW SEISMIC INTERPRETATION AND SPT TEST FOR FOUNDATION OF BRIDGE AT BALANG ISLAND, BALIKPAPAN BAY, EAST KALIMANTAN Ediar Usman; Kris Budiono
BULLETIN OF THE MARINE GEOLOGY Vol 26, No 1 (2011)
Publisher : Marine Geological Institute of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1238.535 KB) | DOI: 10.32693/bomg.26.1.2011.30

Abstract

The study area is located in Balikpapan Bay, the connecting waters between Pancur village at the southwest and Balang Island at the northeast. The objective of study is to know the engineering properties of rock as a foundation groundwork of bridge. Result of seismic reflection interpretation profiles in the survey area indicates that the seismic sequences can be divided into two sequences, those are sequence A and B. Sequence A lies at the upper part, which is characterized by concordance, parallel, wavy and hummocky reflectors. Sequence B is characterized by mounded, chaotic and free reflectors. Sediment thickness obtained from seismic profiles show that Quaternary sediment is about 1.56 to 4.89 meters, while harder substrate thickness ranging between 7.03 and 21.60 meters. While, based on core drilling data, hard rock started to appear between 3 and 4 meters below seafloor with Standard Penetration Test (SPT) between 32 and 34 blows as Tertiary sediments. Based on field observation and correlated with geological map of Balang Island, Balikpapan Sheet, the hard rock proposed for base of bridge foundation is Balang Island Formation (Middle Miocene) that consist of claystone, sandstone and coal layers that have been deformated and start to form fold as anticline. The seismic record show that, the hard rock is interpreted as B sequence that underlain by Quaternary sediments. Key words: seismic, drilling, Quaternary sediment, hard rock, bridge foundation, Balang Island Daerah penelitian terletak di Teluk Balikpapan, merupakan perairan penghubung antara desa Pancur di bagian baratdaya dan Pulau Balang di bagian timurlaut. Tujuan penelitian in untuk mengetahui sifat keteknikan batuan keras sebagai tapak jembatan. Hasil interpretasi rekaman seismik di lokasi penelitian menunjukkan bahwa sekuen sedimen dapat dibagi menjadi dua yaitu Sekuen A dan B. Sekuen A terletak di bagian atas dengan ciri reflektor selaras, sejajar, bergelombang terputus-putus dan perlapisan terputus-putus. Bagian paling bawah adalah Sekuen B dicirikan oleh bentuk reflektor berbukit-bukit kecil, berbintik-bintik kacau tidak beraturan dan makin ke bawah dicirikan oleh bebas pantul. Hasil perhitungan ketebalan sedimen pada penampang seismik diperoleh ketebalan sedimen Kuarter antara 1,56 - 4,89 meter dan kedalaman batuan keras berkisar antara 7,03 – 21,60 meter. Sedangkan berdasarkan data pemboran, batuan keras mulai muncul pada kedalaman 3 - 4 meter di bawah dasar laut dengan SPT antara 32 – 34 sebagai sedimen Tersier. Berdasarkan pengamatan di lapangan dan dikorelasikan dengan peta geologi P. Balang, Lembar Balikpapan, batuan keras yang diusulkan sebagai dasar tapak jembatan adalah Formasi Pulau Balang (Miosen Tengah) yang terdiri atas batulempung, batupasir and batubara yang sudah mengalami deformasi dan mulai terlipat membentuk antiklin. Pada penampang seismik, batuan keras tersebut adalah Sekuen B yang ditutupi oleh sedimen Kuarter. Kata kunci: seismik, pemboran, sedimen Kuarter, batuan keras, tapak jembatan, Pulau Balang.
LITOSTRATIGRAPHIC AND SEDIMENTOLOGICAL SIGNIFICANTS OF DEEPENING MARINE SEDIMENTS OF THE SAMBIPITU FORMATION GUNUNG KIDUL RESIDENCE, YOGYAKARTA Surono Surono; Asep Permana
BULLETIN OF THE MARINE GEOLOGY Vol 26, No 1 (2011)
Publisher : Marine Geological Institute of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (966.614 KB) | DOI: 10.32693/bomg.26.1.2011.31

Abstract

Sambipitu Formation in the Southern Mountains plays an important role due to its stratigraphic position, between syn-volcanism and post- volcanism periods. The formation widely distributes along the southern slope of the Baturagung Mountains, Gunung Kidul Residence, Yogyakarta Province. Stratigraphically, the Sambipitu Formation is conformably underlain by dominated unit of volcanic breccias of the Nglanggran Formation, and conformably overlain by dominated unit of marl of the Oyo Formation. Based on detail section along the river of Ngalang, the Sambipitu Formation can be divided into Lower and Upper Members. The Lower Member is dominated by sandstone and siltstone, which is alternated by breccias. The Upper Member is dominated by siltstone and mudstone, which is intercalated by sandstone, marl and conglomerate. The Lower Member was deposited on an environment influenced by tidal current, which was highly affected by gravity flows of volcanic material. This deposition environment was getting deeper to be an inner shelf, where the Upper Member was deposited. Furthermore, based on Rock-eval pyrolysis, TOC value of the Sambipitu Formation ranges from 0.08% to 0.43%, whilst the PY (potential yield) value less than 0.15 mg HC/g rock. Thus, on the basis of those two parameters, the Sambipitu Formation is included into oil prone source rock potential of poor category. Moreover, Tmax value of the Sambipitu Formation ranges from 226°C - 335°C, with the HI (hydrogen Index) value varies from 0 – 12. It indicates that this formation contains kerogen Type III. Therefore, the organic thermal maturation based on plotting of Tmax vs HI, this formation falls into an immature category. Key word: Lithostratigraphy, volcanic material, tidal flat, inner shelf, and Sambipitu Formation. Formasi Sambipitu memegang peran penting karena posisi stratigrafinya yang terletak diantara perioda volkanisme dan pasca volkanisme. Formasi ini tersebar luas di lereng selatan Pegunungan Baturagung, Kabupaten Gunung Kidul, Provinsi Daerah Istimewa Yogyakarta. Formasi Sambipitu menindih selaras Formasi Nglanggran dan ditindih selaras oleh Formasi Oyo. Berdasarkan penampang stratigrafi rinci sepanjang Sungai Ngalang, Formasi Sambipitu dapat dibagi menjadi: Anggota Bawah dan Anggota Atas. Anggota Bawah didominasi oleh perselingan batupasir dan batulanau, dengan sisipani breksi gunung api. Sedangkan Anggota Atas didominasi oleh batulanau dan batulumpur dengan sisipan batupasir dan konglomerat. Anggota Bawah diendapkan di lingkungan paparan pasang-surut yang dipengaruhi oleh pengendapan material gunung api. Paparan pasang-surut itu semakin dalam menjadi paparan dalam dimana diendapkan Anggota Atas. Berdasarkan analisis Rock-eval pirolisis, nilai kandungan karbon total (TOC) serpih Formasi Sambipitu berkisar 0,08% – 0,43%, sedangkan Potential yield (kandungan cairan hidrokarbon) kurang dari 0,15 mg HC/g batuan. Berdasarkan dua parameter tersebut diatas, formasi tersebut termasuk kedalam kategori oil prone source rock, dengan kategori buruk (poor). Formasi Sambipitu mempunyai nilai temperatur maksimum (Tmax) antara 226°C - 335°C, dengan nilai HI (Hydrogen Index) kurang dari 12, menunjukkan formasi ini memiliki kerogen tipe III. Berdasarkan diagram temperatur maksimum (Tmax) terhadap nilai indeks hidrogen (HI) bahan organik, kematangan organik dari formasi ini termasuk ke dalam tingkat belum matang. Kata kunci: Litostratigrafi, material volkanik, paparan pasang-surut, paparan dalam, dan Formasi Sambipitu.
ABNORMAL MICROFAUNAL SHELLS AS EARLY WARNING INDICATOR OF ENVIRONMENTAL CHANGES SURROUNDING BERAU DELTA, EAST KALIMANTAN Kresna Tri Dewi; Yusuf Adam Priohandono
BULLETIN OF THE MARINE GEOLOGY Vol 26, No 1 (2011)
Publisher : Marine Geological Institute of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (707.917 KB) | DOI: 10.32693/bomg.26.1.2011.32

Abstract

A total of 25 sediment samples from surrounding Berau Delta, East Kalimantan have been used for microfaunal study. It is found some abnormal shells of ostracoda, foraminifera and other forms with darkish shells (black, dark green and dark brown). These forms were analyzed using SEM-Energy Dispersive X-ray spectroscopy (EDX or EDS) to know their chemical composition. The result shows that these abnormal forms composed of CaO, SiO2, C, FeO, Al2O3, K2O, and small amount of Na2O and Cl. They may derive from different sources: CaO and MgO from neutralized component during the environmental management to handle the Acid Mine Drainage (AMD). The other components may derive from coal ash during combustion process or other activities. From this result, the small amount (less than 5%) of abnormal shells may be used as early warning indicator of environmental changes in the study area. Keywords: abnormal microfaunal shells, chemical composition, Berau Delta. Sebanyak 25 sampel sedimen dari sekitar Delta Berau, Kalimantan Timur telah digunakan untuk studi mikrofauna. Ditemukan cangkang abnormal dari ostracoda, foraminifera dan spesimen bentuk lain dengan cangkang kegelapan (hitam, hijau tua dan coklat tua) Bentuk-bentuk ini kemudian dianalisa menggunakan SEM-Energy Dispersive X-ray spectroscopy (EDX or EDS) untuk mengetahui komposisi kimiawinya. Hasilnya menunjukkan bahwa cangkang-cangkang mikrofauna yang abnormal ini mengandung CaO, SiO2, C, FeO, Al2O3, K2O, dan sedikit kandungan Na2O dan Cl. Komponen ini kemungkinan mempunyai sumber yang berbeda: CaO dan MgO mungkin berasal dari bahan penetral selama pengelolaan lingkungan untuk mengatasi air asam tambang (AMD). Komponen lain berasal dari abu batubara saat proses pembakaran atau aktivitas lain. Jumlah cangkang abnormal yang sedikit (kurang dari 5%) ini kemungkinan dapat digunakan sebagai indikator peringatan dini adanya perubahan lingkungan di daerah penelitian. Kata kunci: cangkang mikrofauna abnormal, komposisi kimiawi, Delta Berau
FAULT PATTERN AND ACTIVE DEFORMATION OF OUTER ARC RIDGE OF NORTHWEST OF SIMEULUE ISLAND, ACEH, INDONESIA Haryadi Permana; K. Hirata
BULLETIN OF THE MARINE GEOLOGY Vol 26, No 1 (2011)
Publisher : Marine Geological Institute of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1412.318 KB) | DOI: 10.32693/bomg.26.1.2011.33

Abstract

New bathymetric map of northwest Simeuleu Island area (3° 01’N-4°57’N and 93°16’E-94°08’E) has evidently illustrated fine morphological image of Outer Arc ridge and Aceh Fore Arc. The structural lineament pattern, inferred from the bathymetric map, could define in general elongated major NW-SE thrust fault complex, thrust fold, or bedding trace and N-S, NNE-SSW, WNW-ESE or ENE-WSW and E-W structural lineament trend. High intensity deformation processes related to high degree obliquity subducted plate was represented by rough and sigmoidal morphological shape, landward and steep to very steep dip angle of bedding plan. Rough morphology, V to U shape valley, dissected ridge and circular shape of landslide trace are common morphology features of active deformation zone. In the near future, high resolution marine seismic will be planned across this area to capture and confirm the subsurface structure configuration and fault movement. Keyword: bathymetric map, Outer Arc ridge, thrust fault, thrust fold, bedding trace, sigmoidal morphological, V to U shape valley,and landslide. Peta batimetri baru di sebelah barat laut Pulau Simelue (3° 01’LU - 4°57’LU and 93°16’BT-94°08’BT), memperlihatkan citra morfologi yang halus pada punggungan busur luar dan busur depan Aceh. Pola kelurusan struktur mengacu pada peta batimetri, dibagi dalam komplek sesar naik yang berarah umum baratlaut - tenggara, lipatan, atau jejak perlapisan dengan kecendrungan arah struktur utara-selatan, utara timur laut – selatan barat daya, barat - barat daya, timur tenggara atau timur laut - barat daya dan timur - barat. Proses deformasi intensitas tinggi berkaitan dengan derajat kemiringan penunjaman yang tinggi, diwakili oleh bentuk morfologi sigmoid dan kasar, ke arah darat dicirikan oleh kemiringan bidang lapisan terjal hingga sangat terjal. Bentuk morfologi kasar seperti bentuk lembah V hingga U, punggungan yang terpotong dan bentuk melingkar dari jejak longsoran merupakan gambaran morfologi umum dari zona deformasi aktif. Dalam waktu dekat, seismik laut resolusi tinggi akan direncanakan memotong daerah ini untuk menggambarkan dan mengkonfirmasi konfigurasi struktur bawah permukaan dan pergerakan sesar. Kata kunci : peta batimetri, punggungan busur luar, sesar naik, lipatan, jejak bidang perlapisan, morfologi sigmoid, bentuk lembah V hingga U,dan longsoran.

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