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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 5 Documents

Search results for , issue "Vol 24, No 2 (2009)" : 5 Documents clear

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

DIAGENETIC FEATURES OF PALEO LAGOONAL REEF OF TACIPI AREA, SOUTH CELEBES Andri Slamet Subandrio
BULLETIN OF THE MARINE GEOLOGY Vol 24, No 2 (2009)
Publisher : Marine Geological Institute of Indonesia

Limestone outcrops of the Tacipi area is an ideal carbonate platform part of Neogene East and West Sengkang Basin that are located in the south part of Sulawesi, precisely in western of Bone city. The limestones of this area, outcropping mainly on the north-south oriented hills such as Temapole, Anadara, Tamping, Lappa, etc., are the best reef example in the Tacipi area, as the reef itself, its debris and detritus can be distinguished in the field. Throughout the ridges and pinnacle in Tacipi field the limestones are predominantly homogenous boundstones on the top and detrital bioclastic packstones with local grainstones, and wackestones at the bottom. There are four major reef zonation indentified pacth reef, barrier reef, fore reef and lagoon. The extensive freshwater leaching of fossil fragments and calcareous cement give the preservation of biomouldic and vug pore spaces. Key words : limestones, reef, Tacipi Singkapan batugamping daerah Tacipi merupakan suatu paparan karbonat Neogen yang ideal di timur dan barat Cekungan Sengkan yang terletak di bagian selatan Sulawesi, tepatnya di sebelah barat kota Bone. Batugamping di daerah tersebut, terutama tersingkap berorientasi utara â€“ selatan sejajar gunung-gunung seperti di Tempole, Anadara, Tamping, Lappa dan lain-lain, merupakan contoh terumbu terbesar di daerah Tacipi, sebagai bagian dari terumbu, sisa-sisa dan runtuhannya dapat dibedakan di daerah tersebut. Sepanjang punggungan dan puncaknya di daerah Tacipi, batugamping merupakan bagian utama dari lapisan pengikat yang homogen di bagian atas dan detrital bioklastik koral terpilah buruk dengan lokal struktur butiran secara setempat, dan struktur bioklastik laut pada bagian bawah. Ada empat zonasi utama terumbu yang telah identifikasi sebagai karang gosong, karang penghalang, karang depan dan lagun. Air tawar yang luas terlarut dari pecahan fosil dan semen mengandung zat kapur memberikan pengawetan terhadap jejak-jejak kehidupan dan pori-pori. Kata kunci : batugamping, terumbu, Tacipi

PALYNOLOGY OF TÃ–GI NDRAWA CAVE,COASTAL AREA OF NIAS ISLAND, NORTH SUMATERA A.A Polhaupessy
BULLETIN OF THE MARINE GEOLOGY Vol 24, No 2 (2009)
Publisher : Marine Geological Institute of Indonesia

Environmental study of the TÃ¶gi Ndrawa Cave by means of pollen analysis has been carried out. The interpretation is made based on the occurring pollen types as guide, the resulted pollen spectra, and curves exhibited in the pollen diagram. Combined evidences obtained from the palynological, geological and archaeologi cal studies provide the basis for the interpretation of plant ecology of shore and further the vegetational history of the marine area. In the meantime, plant ecology itself is concerned not only with plant communities but also the interaction among the plants involved, and their environmental factors. Keyword: Environmental, Pollen Analysis, TÃ¶gi Ndrawa Cave Studi lingkungan GuaTÃ¶gi Ndrawa, Pulau Nias, telah dilakukan dengan menggunakan analisis polen. Interpretasi ini berdasarkan hadirnya jenis polen sebagai petunjuk dalam membentuk diagram polen. Hasil studi palinologi, geologi dan arkeologi telah menghasilkan interpretasi dasar mengenai ekologi tumbuhan pantai kemudian sejarah tumbuhan yang pernah tumbuh didaerah laut dangkal. Pada zaman ini, ekologi tumbuhan tidak hanya tergantung komunitas tumbuhan tetapi justru tergantung pada interaksi diantara komunitas tumbuhan dan faktor lingkungannya. Kata Kunci: Lingkungan, Analisis polen, Gua TÃ¶gi Ndrawa

SEDIMENTATION AND DEPOSITIONAL ENVIRONMENT BASED ON SEISMIC AND DRILLING CORE ANALYSES IN CIMANUK DELTA INDRAMAYU, WEST JAVA I Nyoman Astawa
BULLETIN OF THE MARINE GEOLOGY Vol 24, No 2 (2009)
Publisher : Marine Geological Institute of Indonesia

Core drilling had been carried out in three locations such as in Brondong Village (BH-01), Pasekan Village (BH-02), and Karangsong Village (BH-03). Those three cores are similar in lithology consist of clay. They are correlated based on fragment content, such as fine sand lenses, mollusk shells, rock and carbonate materials which discovered from different depths. Single side band of shallow seismic reflection recorded paleochannels in E sequence at the north and the west of investigated area. Itâ€™s predicted the north paleo channels were part of Lawas River or Tegar River, while the west paleo channels were part of Rambatan Lama River. Microfauna content of all those three cores indicated that from the depth of 0.00 meter down to 25,00 meters are Holocene/Recent, from 25,00 meters to the bottom are Pleistocene which were deposited in the bay to middle neritic environment. Key words: Core drilling, seismic interpretation, Cimanuk Delta Pemboran inti dilakukan di 3 (tiga) lokasi yaitu di Desa Brondong (BH-01), Desa Pasekan (BH- 02), dan Desa Karangsong (BH-03). Ke tiga inti bor itu mempunyai kesamaan litologi yaitu lempung. Korelasi dilakukan berdasarkan kandungan fragmen seperti lensa-lensa pasir halus, cangkang moluska, material batuan dan material karbonat yang terdapat pada kedalaman yang berbeda. Seismik pantul dangkal saluran tunggal merekam adanya alur purba pada runtunan E di bagian utara dan barat daerah penelitian. Diduga alur purba di bagian utara merupakan bagian dari tubuh Kali Lawas atau Kali Tegar, sedangkan di bagian barat sebagai bagian dari tubuh Kali Rambatan Lama. Kandungan mikrofaunanya menunjukkan ketiga bor inti mulai kedalaman 0,00 meter sampai 25,00 meter berumur Holosen/Resen, sedangkan dari 25,00 meter sampai batas bawah pemboran berumur Plistosen yang diendapkan pada lingkungan teluk hingga Neritik Tengah. Kata kunci: Bor inti, penafsiran seismik, Delta Cimanuk.

BIOGENIC GAS IN DELTAIC DEPOSITION ENVIRONMENT IN KAPUAS RIVER, WEST KALIMANTAN AND ITS UTILIZATIONS FOR LOCAL COMMUNITY Hananto Kurnio; Yudi Darlan
BULLETIN OF THE MARINE GEOLOGY Vol 24, No 2 (2009)
Publisher : Marine Geological Institute of Indonesia

Biogenic gas within a deltaic deposition environment in the Kapuas rivermouth of West Kalimantan occurred in fine to very fine quartz sand reservoir of shallow boreholes of having the depth of 1-12 m below ground surface. This reservoir is covered by peaty layers of semi-impermeable property. During high tide, gas bubbling took place in the water column above the ground of these semi-impermeable layers. Utilizations of biogenic gas had been done succesfully. These works were carried out through drilling, piping, gas storage and installations for gas stove and gas electricity generator of 500 watt capacity at chief village house as an example before widely used to the local community. Keywords: Biogenic Gas; Deltaic Deposition Environment; Kapuas River; west Kalimantan, Utilization. Gas biogenik dalam suatu lingkungan pengendapan delta di muara Sungai Kapuas Kalimantan Barat terdapat dalam reservoar pasir kuarsa berukuran halus hingga sangat halus pada kedalaman bor dangkal 1-12 m di bawah permukaan tanah. Reservoar ini ditutupi oleh lapisan gambut semiimpermeabel. Selama pasang naik, gelembung gas teramati dalam kolom air di atas permukaan lapisan semi-impermeabel ini. Pemanfaatan gas biogenik telah dilaksanakan dengan sukses. Pemanfaatan ini dilakukan melalui pemboran, pipanisasi, penampungan gas dan instalasi untuk kompor gas dan generator listrik berbahan bakar gas kapasitas 500 watt di rumah Kepala Desa sebagai contoh sebelum dimanfaatkan secara luas oleh masyarakat setempat. Kata kunci: Gas Biogenik, Lingkungan Pengendapan Delta, Sungai Kapuas, Kalimantan Barat, Pemanfaatan

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