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BULLETIN OF THE MARINE GEOLOGY

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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 173 Documents

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THE INCLINATION OF COASTLINE CHANGES AND ITS IMPLICATION FOR LANDUSE MANAGEMENT OF KARAWANG DISTRICT, WEST JAWA PROVINCE Ediar Usman
BULLETIN OF THE MARINE GEOLOGY Vol 24, No 1 (2009)
Publisher : Marine Geological Institute of Indonesia

Result of observation at 11 locations and the coastline analysis at year map 1990 published by Bakosurtanal and year map 2005 published by Bappeda of Karawang District shows that the existence of changes of the coastline is caused by abrasion and accretion process. The coastal abrasions are occurred in Muarabaru, South Pusakajaya, Cemarajaya and Tanjungpakis areas. The coastal accretions are occurred in Ciparage - Sukajaya, Mekarpohaci, Cemarajaya - South Pusakajaya, East and West Tanjungpakis areas. During the periods of 15 years the abrasions are occurred with the width of 813,171 ha (8,13171 km2) and the coastal long of 30,637 km, and accretions with the width of 1346,22 ha (13,4622 km2) and the coastal long of 43,313 km. Every year the width of abrasion is about 54,21 ha or about 0,5421 km2/year and the width of accretion is about 89,748 ha/year or 0,8975 km2/year. The growth of coastal area about 89,748 ha/year or 0,8975 km2/year. If the coastal management is conducted at the abrasion coasts, the coastal damage can be decreased, and the coastal growth for the productive landuse can be increased. Keywords: coastline changes, abrasion, accretion, landuse development. Hasil pengamatan pada 11 lokasi dan analisis garis pantai pada peta tahun 1990 yang dipublikasikan oleh Bakosurtanal dan peta tahun 2005 yang dipublikasikan oleh Bappeda Kabupaten Karawang menunjukkan adanya perubahan garis pantai yang disebabkan oleh proses abrasi dan akresi. Pantai abrasi terjadi di daerah Muarabaru, Pusakajaya Selatan, Cemarajaya, Sedari dan Tanjungpakis. Pantai akresi terjadi di daerah Ciparage - Sukajaya, Mekarpohaci, Cemarajaya - Pusakajaya Selatan dan Tanjungpakis Timur & Barat Selama kurun 15 tahun telah terjadi abrasi seluas 813,171 ha (8,13171 km2) dengan panjang pantai 30,637 km, dan akresi seluas 1346,22 ha (13,4622 km2) dengan panjang pantai 43,313 km. Setiap tahun terjadi abrasi seluas 54,21 ha atau sekitar 0,5421 km2/tahun dan akresi seluas 89,748 ha/tahun atau sekitar 0,8975 km2/tahun. Pertumbuhan kawasan pantai masih lebih besar, yaitu sekitar 89,748 ha/tahun atau sekitar 0,8975 km2/tahun. Bila pengelolaan dilakukan pada pantai-pantai abrasi, maka kerusakan pantai dapat dikurangi dan pertumbuhan pantai untuk lahan produktif masih dapat ditingkatkan. Kata kunci: perubahan garis pantai, abrasi, akresi, pengembangan tataguna lahan.

CHARACTERISTIC OF SHALLOW SUBSURFACE LITHOLOGY BASED ON GROUND PROBING RADAR DATA INTERPRETATION AT TEMAJU COAST, SAMBAS DISTRICT, WEST KALIMANTAN PROVINCE Yogi Noviadi
BULLETIN OF THE MARINE GEOLOGY Vol 29, No 2 (2014)
Publisher : Marine Geological Institute of Indonesia

In order to know the subsurface lithology characteristic at Temaju coast, the Ground Probing Radar (GPR) detection have been carried out. The detection was done along the coast around 11 GPR track line. The equipment which was used are SIR III with 270 MHz antenna. Based on the analysis results of GPR image data which were correlated with the exposed of surface lithology and core drilling log, show that the maximum penetration is about 10 m with the lithology composition as follow: the upper most layer is characterized by sand deposits with about 2 â€“ 3 m width. Below the sand layer is characterized by coral limestone and sandstone. Keywords: subsurface lithology, ground penetrating radar, Temaju Coast Untuk mengetahui karakteristik litologi bawah permukaan di sekitar pantai Temaju, telah dilakukan penditeksian dengan mempergunakan metoda Ground Probing Radar (GPR). Penditeksian telah dilakukan pada sekitar 11 panjang lintasan di sepanjang pantai. Peralatan yang dipergunakan terdiri dari SIR III dengan antenna 270 MHz. Berdasarkan hasil analisis data citra GPR yang dikorelasikan dengan singkapan litologi permukaan dan log pemboran inti, memperlihatkan bahwa penetrasi masimum sekitar 10 m dengan urutan litologi sebagai berikut: lapisan paling atas dicirikan oleh pasir dengan ketebalan sekitar 2-3m. Di bawah lapisan pasir dicirikan oleh batuan gamping terumbu karang dan batu pasir Kata kunci: litologi bawah permukaan, â€œGround Probing Radarâ€, Pantai Temaju

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

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

PALEOENVIRONMENTAL RECONSTRUCTION FROM BENTHIC FORAMINIFERAL ASSEMBLAGES OF EARLY HOLOCENE, SHALLOW MARINE DEPOSITS IN GOMBONG, CENTRAL JAVA Luli Gustiantini; Kresna Tri Dewi; Anne Muller; Praptisih Praptisih
BULLETIN OF THE MARINE GEOLOGY Vol 22, No 1 (2007)
Publisher : Marine Geological Institute of Indonesia

A 30m-long sediment core covering the Holocene period was taken from the area of Gombong in the southern part of Central Java. The sediments were deposited in a shallow marine to lagoonal environment that was confirmed by the dominance of Ammonia beccarii along the core intervals. In addition, the species Quinqueloculina poeyana, Miliolinella lakemacquariensis, and Miliolinella subrotunda were also found in the sediments that are typical of normal shallow marine conditions. The decrease and increase in the abundance of these species throughout the core is an expression of sea level change in the area, which results the environmental changes. Low sea level is expressed by the dominance of Ammonia beccarii, and the low abundances or absence of the other three species. In contrast, high sea level stands are reflected by the presence of all four species. The high sea level would imply favorable conditions for benthic foraminifera because it would result in normal shallow marine conditions in the area. Finally, from this benthic assemblages study, it can be assumed that the environmental transformation from the originally shallow marine environment into land was occurred at level 5.5m depths of the sediment core, when all benthic foraminifera were terminated, including Ammonia beccarii. These new results from the shallow marine deposits in the Gombong area are a new contribution to the understanding of paleoenvironmental change in the region, which in turn is important for understanding sea level change as well as climate change in the region. Keywords: Benthic foraminifera, Holocene, paleoenvironmental changes, sea level changes Southcoast of Central Java Sebuah percontoh sedimen bor sepanjang 30m yang berumur Holosen diambil dari daerah Gombong, bagian selatan Jawa Tengah. Percontoh sedimen diendapkan pada lingkungan laut dangkal â€“laguna, berdasarkan kelimpahan foraminifera bentik Ammonia beccarii di sepanjang sedimen bor. Selain itu ditemukan juga spesies-spesies Quinqueloculina poeyana, Miliolinella lakemacquariensis, dan Miliolinella subrotunda, yang merupakan penciri lingkungan laut dangkal dengan kondisi normal. Penurunan dan kenaikan dari kelimpahan masing-masing spesies foraminifera bentik di atas, dapat mencerminkan perubahan permukaan air laut daerah studi, yang menghasilkan terjadinya perubahan lingkungan. Penurunan muka air laut dapat dicirikan dengan hadirnya Ammonia beccarii yang sangat dominan, sementara spesies lainnya cenderung berkurang bahkan hampir tidak ada. Sebaliknya ketika muka air laut naik, maka keempat spesies foraminifera tersebut cenderung hadir dengan jumlah yang seimbang satu sama lainnya. Kenaikan muka air laut akan menghasilkan lingkungan laut normal yang merupakan kondisi ideal bagi foraminifera. Akhirnya, dari kajian perubahan kelimpahan foraminifera bentik ini, dapat diperkirakan bahwa pada level kedalaman bor 5,5m, terjadi perubahan lingkungan dari lingkungan laut dangkal-laguna menjadi daratan, yang ditandai dengan musnahnya semua jenis foraminifera bentik, termasuk Ammonia beccarii. HAsil kajian ini merupakan kontribusi baru untuk mempelajari perubahan lingkungan pada lokasi penelitian, terutama penting untuk lebih mengerti mengenai perubahan muka air laut dan perubahan iklim. Keywords: Benthic foraminifera, Holocene, paleoenvironmental changes, sea level changes

SUBMARINE MASS MOVEMENT AND LOCALIZED TSUNAMI POTENTIALITY OF MENTAWAI BASIN, SUMATERA, INDONESIA Haryadi Permana; C. Singh
BULLETIN OF THE MARINE GEOLOGY Vol 25, No 2 (2010)
Publisher : Marine Geological Institute of Indonesia

The new bathymetry and seismic data were acquired during the PreTI-Gap marine survey (February 15 to March 6, 2008). The survey was carried out along the NE margin of Mentawai Island using multi-beam swath bathymetry equipment, and 28-channels seismic streamer and four-airgun source. The first target was the Mega Island region near the epicenter of the 2007 great earthquake. The shallow bathymetry is characterized as a flat coral platform suggesting that 200 km elongated plateau is slowly subsiding without any active faults. Further north, from South Pagai to North of Siberut Islands, the seafloor morphology changes significantly. The deep and wide canyons or valleys produce very rough seafloor morphology between 50 and 1100 m water depth. In general, the submarine topography shows two break slopes at different depths. Between slope breaks, the undulating, hilly and circular features dominate, possibly caused by mass movement. A push-up ridge is observed that dams the sediments eroded within a steep slope northeastward side. The seismic reflection data acquired along 14 dip seismic lines at the NE flank of Mentawai Islands, from Siberut to the South of Pagai Islands. We observed a set of southwestward dipping back thrust bounding the NE margin of the Mentawai Island and the push-up ridge observed on bathymetric image, which suggest that Mentawai fault is not pure a strike slip fault, but consists of a set of back thrusts. Such kind of back thrust movement at the flank of Mentawai basin can trigger mass movement or landslide that can produce localized tsunami causing damages to Sumatera mainland such as Padang, Painan or northern Bengkulu provinces and Mentawai Islands. Therefore, it is important to re-design the tsunami warning system, especially in this region, in order to mitigate tsunami risk to coastal region of western Sumatera. Keywords: multi-beam swath bathymetry, 28-channels seismic streamer, seismic reflection, back thrust, mass movement or landslide, tsunami warning system, mitigate tsunami risk Data batimetri dan seismik baru telah didapatkan selama survey kelautan PreTi-Gap (15 Februari hingga 6 Maret 2008). Survei dilaksanakan sepanjang tepian timurlaut Kepulauan. Mentawai menggunakan peralatan multibeam batimetri, seismik saluran ganda 28 kanal dengan 4 sumber energi airgun. Sasaran pertama adalah memetakan kawasan perairan P. Mega dekat pusat gempa besar tahun 2007. Kenampakan batimetri dangkal dicirikan dengan adanya dataran paparan terumbu karang sepanjang 200km yang secara perlahan mengalami penurunan tanpa akifitas sesar. Lebih jauh ke utara dari P. Pagai Selatan sampai di utara P. Siberut, morfologi dasar laut memperlihatkan perubahan secara signifikan yaitu lembah dalam dan lebar membentuk morfologi dasarlaut yang kasar dengan beda kedalaman antara 50 hingga 1100 meter. Secara umum, topografi dasar laut memperlihatkan perhentian dua lereng pada kedalaman yang berbeda. Diantara batas lereng yang dicirikan adanya kenampakan perlipatan, perbukitan dan bentuk melingkar diperkirakan sebagai hasil gelinciran batuan/tanah. Punggungan terangkat yang teramati merupakan penahan endapan yang melongsor pada lereng curam pada sisi sebelah timurlaut. Sebanyak 14 lintasan sismik refleksi pada sayap bagian timurlaut Kepulauan Mentawai, dari P. Siberut hingga ke selatan P. Pagai. Patahan anjak belakang yang teramati dengan sudut kemiringan ke arah baratdaya memotong bagian tepian timurlaut dari Kepulauan Mentawai dan punggungan terangkat yang terekam pada peta batimetri menegaskan bahwa Patahan Mentawai bukan murni sebagai patahan geser mengkanan akan tetapi juga memiliki komponen patahan anjak belakang. Setiap pergerakan sesar anjak di sisi Cekungan Mentawai dapat memicu gerakan tanah atau longsoran bawah laut dapat membangkitkan tsunami lokal yang mengakibatkan kerusakan di daratan Sumatera seperti di Padang, Painan atau Propinsi Bengkulu bagian utara dan Kepulauan Mentawai. Oleh karena itu adalah sangat penting untuk merencanakan sistim peringatan tsunami khususnya di kawasan tersebut dengan tujuan untuk melakukan mitigasi resiko bencana tsunami di kawasan pantai barat Sumatera. Kata Kunci: multibeam batimetri, seismik saluran ganda 28 kanal, sismik refleksi, sesar anjak belakang, gerakan tanah atau longsoran, peringatan dini tsunami, mitigasi resiko tsunami

Rare Earth Elements Vapor Transport By Fumaroles in the Post Caldera Complex of Weh Island Submarine Volcano, Aceh Province Northern Sumatra Hananto Kurnio; Ediar Usman
BULLETIN OF THE MARINE GEOLOGY Vol 31, No 2 (2016)
Publisher : Marine Geological Institute of Indonesia

Research found out that fumaroles and solfataras are rare earth element (REE) vapor transport agents in Weh Island submarine volcano – Aceh. Shallow high resolution single channel seismic was used to map the distribution of seafloor fumaroles surrounding the submarine volcano. Samples of REE depositions were taken from Jaboi geothermal field, and mineralization zone at Pria Laot coast; as well as seafloor surrounding active fumaroles by divers. Rare earth elements (REE) were analysed using ICP – MS (inductively coupled plasma – mass spectrometry) with detection limits ranged from 0.05 to 0.1 ppm (part per million).The central part of Weh submarine volcano is the most active REE deposition. This area is build by normal faults and grabens oriented north – south of open character which acted as channel for hydrothermal fluids reaching seafloor surface.Some REE abundances such as La, Ce, Pr, and Nd due to its location in the central of hydrothermal activity. This proximity explains such abundances of this andesitic component sample of agglomerate. Keywords: REE, vapor transport, fumaroles, Weh Island, Aceh.Penelitian mendapatkan bahwa fumarole dan solfatara adalah sebagai agen transportasi uap Logam Tanah Jarang (LTJ) di gunungapi bawah laut Pulau Weh – Aceh, Provinsi Nanggroe Aceh Darussalam (NAD). Seismik saluran tunggal dangkal resolusi tinggi digunakan untuk memetakan fumarole dasarlaut di sekitar gunungapi bawah laut tersebut.Bagian tengah gunungapi bawah laut Pulau Weh merupakan area paling aktif pengendapan LTJ. Bagian ini dibangun oleh sesar-sesar normal dan graben berorientasi utara – selatan dengan karakter terbuka sebagai saluran untuk fluida hidrotermal mencapai permukaan dasar laut.Kelimpahan unsur tanah jarang La, Ce, Pr dan Nd dikarenakan posisinya pada pusat aktivitas hidrotermal. Kedekatan dengan pusat hidrotermal ini menjelaskan kelimpahan REE dari contoh komponen andesitic yang diambil dari aglomerat ini.Kata kunci: UTJ (Unsur Tanah Jarang), transportasi uap, fumarol, PulauWeh, Aceh.

CHARACTERISTIC OF RARE EARTH ELEMENT IN SEDIMENT AT COASTAL AND OFFSHORE AREA OF KUNDUR ISLAND, RIAU PROVINCE Deny Setiady; I Wayan Lugra
BULLETIN OF THE MARINE GEOLOGY Vol 28, No 2 (2013)
Publisher : Marine Geological Institute of Indonesia

The study area is located at coastal and offshore Kundur and Adjacent Area, geographically located at coordinates of 0Âº 39'00 "0Âº 50'00" N and 103Âº 10'00 "103Âº 25 '00" S. Rare earth elements are found in seven seafloor surfacial sediment and 3 core samples are Cerium (15.41 to 16.88 ppm), Lanthanum (5.40 to 6.80 ppm), Ytrium (5.18 to 5, 58 ppm), Zirconium (5.05 to 5.95 ppm) and Neodymium 20.25 to 20.95 ppm). The minerals that containing of rare earth elements at the study area are apatite, zircon, monazite, and pyrochlore and xenotime. Seafloor surfacial sediment at Kundur are composed by silt (Z), sandy silt (sZ), sandy gravel, mud and sand. Silt unit covering nearly 55% of the study area and followed by sandy gravel, sand, silt and sandy silt. Seafloor morphology varies those are flat morphology with gradually depth changes and a regularly shaped identation curves and holes likely a result of sand mining. Coastal characteristics consists of: sandy and muddy beach. Sandy beach has medium relief (5Â° - 8Â°), composed by medium to coarse sand, brownish yellow. The muddy beach has low relief (1Â° - 5Â°) where the edges of the beach is mangroves planted by the local peoples. Key words : rare earth elements, seabed sediments, sea floor morphology, and Kundur Island Daerah penelitian terletak di kawasan pantai dan lepas pantai perairan Pulau Kundur dan Sekitarnya. Secara geografis terletak pada koordinat 0Âº 39â€™00â€ - 0Âº 50'00â€ LU dan 103Âº 10'00â€- 103Âº 35' 00â€BT. Mineral di daerah penelitian yang mengandung unsur tanah jarang adalah mineral apatit, zirkon, monazit, dan mineral pyrochlore. Unsur tanah jarang yang dijumpai pada tujuh contoh sedimen permukaan dasar laut dan 3 contoh bor inti adalah Cerium (15,41 â€“ 16,88 ppm), Lanthanum (5,40 â€“ 6,80 ppm), Ytrium (5,18-5,58 ppm), Zirkonium ( 5,05-5,95 ppm) dan Neodimium 20,25 â€“ 20,95 ppm). Sedimen permukaan dasar laut di perairan Kundur tersusun oleh lanau (Z), lanau pasiran (sZ), kerikil pasiran, lumpur dan pasir. Satuan lanau menutupi hampir 55% dari seluruh daerah penelitian diikuti oleh krikil pasiran , pasir, lumpur dan lanau pasiran. Morfologi permukaan dasar laut sangat bervariasi ada yang landai dengan perubahan kedalaman yang teratur ada juga yang berbentuk lekukan lekukan dan lubang lubang besar kemungkinan akibat dari penambangan pasir. Karakteristik pantainya terdiri dari : pantai berpasir dan pantai berlumpur. Â Pantai berpasir, berelief sedang (5Â° - 8Â°), tersusun oleh pasir ukuran butir sedang sampai kasar, berwarna kuning kecoklatan. Pantai berlumpur berelief rendah berkisar antaraÂ (1Â° - 5Â°) dimana pada bagian tepinya ditanami bakau oleh penduduk setempat. Kata kunci: unsur tanah jarang, sedimen permukaan dasar laut, morfologi permukaan dasar laut, dan Pulau Kundur

CONCENTRATION AND DISTRIBUTION OF POLYCYCLIC AROMATIC HIDROCARBONS (PAHs) DURING BIOREMEDIATION PROCESSES OF OIL-CONTAMINATED BEACH SEDIMENTS IN KARANG SONG BEACH, INDRAMAYU Khozanah Khozanah; Dede Falahudin
BULLETIN OF THE MARINE GEOLOGY Vol 31, No 1 (2016)
Publisher : Marine Geological Institute of Indonesia

Bioremediation research was conducted from June to September, 2010 in oil-contaminated beach sediment in Karang Song Beach, Indramayu. The objective of this paper is to determine concentration and distribution of polycyclic aromatic hydrocarbon (PAH) during bioremediation processes. Upon 90 days biodegradation treatment, PAH concentration was reduced in several mesocosms. Concentration of PAH before treatment and after 90 day incubation were follows, Mesocosm A (110.499 mg/kg to 16.125 mg/kg), Mesocosm B (217.067 mg/kg to 12.239 mg/kg), Mesocosm C (102.016 mg/kg to 16.695 mg/kg), Mesocosm D (124.256 mg/kg to 60.869 mg/kg), Mesocosm E (117.723 mg/kg to 50.663 mg/kg), Mesocosm F (143.495 mg/kg to 38.310 mg/kg), and Mesocosm G (9.838 mg/kg to 4.248 mg/kg). Generally, all mesocosms treatment was reduced of PAH concentration, but there are no stable degraded after 60, and 90 days incubation. Fertilizer application has showed good influence for increasing degradation rate of bacteria to degraded oil contaminant. Keywords: polycyclic aromatic hydrocarbons (PAH), bioremediation, mesocosm, Karang Song, IndramayuPenelitian bioremediasi dilakukan dari Juni hingga September, 2010 di pantai Karang Song, Indramayu yang sedimen telah terkontaminasi minyak. Tujuan penelitian dari makalah ini adalah untuk mengamati konsentrasi dan distribusi Polisklik Aromatik Hidrokarbon (PAH) selama proses bioremediasi. Setelah 90 hari pengamatan biodegradasi, konsentrasi PAH dalam beberapa mesokosme menjadi menurun.. Konsentrasi PAH saat awal perlakuan dan setelah 90 hari inkubasi adalah sebagai berikut:, Mesokosme A (110,499 mg / kg menjadi 16,125 mg / kg), Mesokosme B (217,067 mg / kg menjadi 12,239 mg / kg), Mesokosme C (102,016 mg / kg menjadi 16,695 mg / kg), Mesokosme D (124,256 mg / kg menjadi sampai 60,869 mg / kg), Mesokosme E (117,723 mg / kg menjadi 50,663 mg / kg), Mesokosme F (143,495 mg / kg menjadi 38,310 mg / kg), dan Mesokosme G (9,838 mg / kg menjadi 4,248 mg / kg). Umumnya, semua pengobatan mesokosme menyebabkan berkurang konsentrasi PAH, tetapi tidak ada yang stabil terdegradasi setelah 60, dan 90 hari inkubasi. Pemupukan telah menunjukkan pengaruh yang baik untuk meningkatkan tingkat degradasi bakteri kontaminan minyak terdegradasi.Kata kunci: polycyclic aromatic hydrocarbons (PAH), bioremediasi, mesocosm, Karang Song, Indramayu

INVESTIGATION OF GROUND PENETRATING RADAR FOR DETECTION OF ROAD SUBSIDENCE NORTHCOAST OF JAKARTA, INDONESIA Kris Budiono; Yogi Noviadi
BULLETIN OF THE MARINE GEOLOGY Vol 27, No 2 (2012)
Publisher : Marine Geological Institute of Indonesia

A survey of Ground Penetrating Radar (GPR) was conducted in the coastal zone of northern part of Jakarta, Indonesia. The purpose of this survey was to provide the subsurface of coastal Quaternary sedimentary features and stratigraphy disturbances associated with induce post road subsidence 2009. The possibility of subsurface lithology disturbance shown by the GPR record. This record resulted from GPR methods using SIR system 20 GSSI, 270 MHz and 400 MHz and MLF 3200 transducer. The method is a promising tool for resolving changes of physical properties in subsurface lithology condition at the natural scale due to composition changes of physical properties.The reflection data resulted that GPR can distinguish between image the basic geometry forms such as lithology , structure geology , soil and subsurface utilities condition Keywords: Quaternary geology, Jakarta subsidence northern road 2009, Ground Penetrating Radar Penyelidikan â€œGround Penerating Radarâ€ (GPR) telah dilaksanakan di kawasan pantai utara Jakarta Utara, Indonesia. Tujuan dari penyelidikan GPR ini adalah untuk melihat kondisi sedimen Kuarter bawah permukaan dan gangguan stratigrafi sehubungan dengan penurunan jalan raya pada tahun 2009. Kemungkinan gangguan terhadap litologi bawah permukaan terlihat pada rekaman GPR. Hasil rekaman metoda GPR mempergunakan model SIR 20 GSSI, transduser 270MHz, 400 MHz dan MLF 3200.Metoda GPR merupakan alat bantu yang cukup menjanjikan untuk melihat perubahan sifat fisik litologi bawah permukaan pada skala sebenarnya yang disebabkan oleh perubahan komposisi sifat fisiknya. Hasil refleksi data GPR dapat membedakan bentuk dasar geometri seperti litologi, struktur geologi, kondisi utilitas bawah permukaan. Kata kunci : Geologi Kuarter, Penurunan jalan utara Jakarta 2009, Ground Penetrating Radar

THE CHARACTERISTIC OF RECENT SEDIMENT IN SEGARA ANAKAN LAGOON, CIAMIS REGENCY, WEST JAVA I Wayan Lugra; Hananto Kurnio
BULLETIN OF THE MARINE GEOLOGY Vol 24, No 2 (2009)
Publisher : Marine Geological Institute of Indonesia

The high intensity of erosions at the rivers upstream which are rivermouthed into the Segara Anakan Lagoon, as sources of the materials which are causing the sedimentation on the lagoon systematically. Based on smear slide analyses and major element contents, source of the sediment which is deposited in the lagoon floor, was predicted as the volcanic products. This condition is supported by the existence of non biogenic materials such as quartz, mica, ferro-oxides, manganese oxides and tuff in the lagoon. Beside that, the existence of major elements such as SiO2 (36,6 â€“ 51,4%) Al2O3 (13,38 â€“ 24,70%), and Fe2O3 (8,69 â€“ 30,6%), is particular element indicators of volcanic products. The lithology in the survey area are volcanic products such as Jampang Formation and Panutuan Formation. Jampang Formation consist of volcano breccia, tuff intercalated with lava and sandstone, claystone, napal intercalated with conglomerate. Panutuan Formation consist of sandstone, napal and tuff, Formation Members of Tuff Napalan, Panutuan Formation, which are spread on the basinal area of Citanduy, Cibeureum, and Ciseel rivers which are rivermouthed into Segara Anakan Lagoon. Key words : smear slide, major element, Segara Anakan. Intensitas erosi yang tinggi di daerah hulu sungai-sungai yang bermuara di Segara Anakan sebagai sumber material yang mengakibatkan sedimetnasi laguna secara sistematis. Sumber pasokan sedimen yang diendapkan di dasar laguna berdasarkan analisis sayatan oles, dan unsur utama mineral diperkirakan merupakan produk vulkanik yang bersifat basa. Hal ini didukung oleh terdapatnya mineral non biogenik seperti mineral kuarsa, mika, oksida besi, oksida mangan yang dijumpai tersebar secara merata, adalah produk vulkanik, berupa tuff. Disamping itu keterdapatan unsur utama mineral seperti SiO2 dengan kisaran 36,6 â€“ 51,4%, kemudian Al2O3 dengan kisaran 13,38 â€“ 24,70% sedangkan Fe2O3 dengan kisaran 8,69 â€“ 30,6%, merupakan mineral khas hasil produk vulkanik yang bersifat basa. Litologi daerah penelitian merupakan produk gunungapi, seperti Formasi Jampang yang tersusun oleh breksi gunungapi tuff dengan sisipan lava, berselingan dengan batupasir, batulempung napal dengan sisipan konglomerat. Formasi Panutuan yang tersusun batupasir, napal dan tuff, Anggota Tuff Napalan formasi Panutuan, dan berada di daerah rendahan sungai Citanduy, Cibeureum, Ciseel beserta anak anak sungainya yang bermuara di Segara Anakan. Kata kunci : sayatan oles, unsur utama, Segara Anakan

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