Udaya Kamiludin
Marine Geological Institute of Indonesia, Jl. DR. Junjunan No. 236, Telp. 022 603 2020, 603 2201, Faksimile 022 601 7887, Bandung

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INDICATION OF GOLD AND SILVER OCCURRENCE AT SAMPIT BAY, KOTA WARINGIN TIMUR DISTRICT, CENTRAL KALIMANTAN PROVINCE I Wayan Lugra; Udaya Kamiludin
BULLETIN OF THE MARINE GEOLOGY Vol 28, No 1 (2013)
Publisher : Marine Geological Institute of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (830.816 KB) | DOI: 10.32693/bomg.28.1.2013.50

Abstract

The study area is fluviatile deposit which consists of yellow to light gray loose sand, iron oxide, and kaoline spreading from the land shallowing to sea direction. Concentration grade for determining of gold and silver content used a total analysis of the hot mixture HF-HNO3-HClO4 with measurements "Atomic Absorption Spectrofotometry".(AAS). Highest concentration of gold and silver found at sample GCTS-31 that gold 0.096 ppm and silver 2.284 ppm, in muddy sand type sediment, at 3.1 meters depth and arround 1,250 meter length from coast line. While the lowest concentration of the gold was 0.025 ppm found at sample GBTS 14 in very fine sand type sediment located at 1.07 meter depth and approximately 320 meters length from coast line. The lowest concentration of the silver was founded at sample GBTS 25 that is 0.860 ppm in sandy mud sediment type located at 2.49 meters depth and approximately 3,000 meters length from the coast line. The gold placer is may derived from weathering of Pambuang Formation which spreads in the west and north of Sampit Bay, and transported by Mentaya River and longshore current system. Key word : sediment samples, laboratory analyses, gold, silver and Sampit Bay. Daerah penelitian merupakan endapan fluviatil terdiri dari pasir lepas berwarna kuning muda sampai abu-abu pucat, oksida besi, dan kaolin yang memiliki sebaran makin mendangkal ke arah laut. Kadar konsentrasi untuk menentukan kandungan emas dan perak menggunakan analisis total campuran HF-HNO3-HClO4 dengan metoda AAS. Analisa besar butir digunakan untuk memisahkan sedimen fraksi kasar sedangkan analisa pipet dilakukan terhadap sediment fraksi halus. Kadar emas dan perak tertinggi terdapat pada contoh GCTS -31, yaitu emas 0,096 ppm dan perak 2,284 ppm, pada jenis sedimen lumpur pasiran, di kedalaman 3,1 meter dan sekitar 1.250 meter dari garis pantai. Sedangkan kadar emas terendah yaitu 0,025 ppm terdapat pada contoh GBTS 14 pada jenis sedimen pasir sangat halus di kedalaman 1,07 meter dan sekitar 320 meter dari garis pantai. Kadar perak terendah dijumpai pada contoh GBTS 25 yaitu 0,860 ppm dengan jenis sedimen pasir lumpuran pada kedalaman 2,49 meter dan sekitar 3.000 meter dari garis pantai. Sumber emas plaser diperkirakan dari lapukan Formasi Pembuang yang memiliki sebaran cukup luas di sebelah barat dan utara Teluk Sampit dan ditransportasi oleh Sungai Mentaya dengan anak-anak sungainya, serta sistem arus memanjang pantai. Kata kunci : contoh sedimen, analisis laboratorium, emas, perak dan Perairan Teluk Sampit.
COASTAL CHARACTERISTICS OF PAPELA AND ADJACENT AREA, ROTE ISLAND, EAST NUSA TENGGARA Nineu Yayu Gerhanae; Udaya Kamiludin
BULLETIN OF THE MARINE GEOLOGY Vol 28, No 1 (2013)
Publisher : Marine Geological Institute of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (692.173 KB) | DOI: 10.32693/bomg.28.1.2013.52

Abstract

Coastal typhology as data base that describes the result of interaction among geophysical element to geological elements and anthropogenic aspects. This data can provide any information of morphological development processes which is reflected in the coastal characteristics map. Identification of the Papela coastal area, Rote Island, about 60 km length, based on indirect and direct methods. Direct method is done by field observation such as : geological condition, relief, shoreline character and dominant process. While indirect method is done by imagery satellite interpretation and related previous data. Observation results of coastal condition, that the study area is divided into four coastal types, there are rocky cliff, sandy pocket beach, muddy and sandy beach. Coastal geology of study area composed of Holocene Alluvium, Quaternary Coral Limestone and Tertiary Bobonaro Complex that has low to high rocks resistance. Coastal morphology form by alluvium plain until slope rugged hills with low-high relief. The coastline characters consist of the rocky cliff, sandy pocket, sandy and muddy beach, with dominant process that influenced by fluviatil which is characterized by mangrove. Beach face material composed of sand and float stone, from 15-30 meters width with 5O-15O slope. Although the coastal area is relatively stable but erosion active process occurs at some places. It is characterized by float stone, and notches accompanied by rock fall. While, accretion occur in muddy coastal type that is characterized by mangrove plants. Key words : Coastal type, marine process, abrasion, accretion, Papela coast, Rote Island. Tipologi pantai sebagai data dasar yang menggambarkan hasil interaksi antara unsur geofisika terhadap unsur geologi dan aspek antropogenik. Data ini dapat memberikan informasi proses pembentukan morfologi yang tercermin di dalam peta karakteristik pantai. Identifikasi pesisir sepanjang lebih kurang 60 km di sekitar pantai Papela, Pulau Rote, Nusa Tenggara Timur menggunakan pendekatan metode langsung dan tidak langsung. Metode langsung dilakukan dengan pengamatan lapangan seperti kondisi geologi, relief, karakteristik garis pantai dan proses dominan. Sedangkan pendekatan tidak langsung melalui kajian citra satelit dan data terdahulu yang terkait. Hasil pengamatan kondisi pantai, bahwa daerah penelitian dibagi mejadi empat tipe pantai yaitu pantai bertebing batuan, berkantong pasir, berlumpur dan pantai berpasir. Geologi pantai daerah penelitian disusun oleh Alluvium Holosen, Batugamping Koral Kuarter dan Komplek Bobonaro Tersier yang mempunyai resistensi batuan rendah sampai tinggi. Morfologi pantainya berupa pedataran pantai alluvium sampai kaki/lereng perbukitan bertebing dengan relief rendah-tinggi. Karakter garis pantainya terdiri dari bertebing batuan, berkantong pasir, pantai berpasir, dan berlumpur dengan proses dominan yang dipengaruhi oleh fluviatil dicirikan oleh tumbuhan bakau. Paras muka pantai disusun oleh material pasir dan rataan batuan, memiliki lebar berkisar 50 meter dengan kemiringan datar-landai pada tipe pantai berpasir. Meskipun terjadi kesetimbangan pantai atau merupakan pantai yang relatif stabil tetapi di beberapa tempat proses abrasi tetap aktif. Hal ini dicirikan oleh adanya rataan batuan, dan takik-takik yang disertai oleh jatuhan batuan. Sebaliknya, sedimentasi terjadi pada tipe pantai berlumpur yang dicirikan oleh tumbuhan bakau. Kata kunci: Tipologi pantai, proses laut, abrasi, akrasi, dan pantai Papela
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