CHARACTERISTIC OF RARE EARTH ELEMENT IN SEDIMENT AT COASTAL AND OFFSHORE AREA OF KUNDUR ISLAND, RIAU PROVINCE

• Main Authors: Deny Setiady, I Wayan Lugra
• Format: Article
• Language: English
• Published: Marine Geological Institute of Indonesia 2017-07-01
• Series: Bulletin of the Marine Geology
• Subjects: rare earth elements; seabed sediments; sea floor morphology; Kundur Island
• Online Access: http://ejournal.mgi.esdm.go.id/index.php/bomg/article/view/57
• ISSN: 1410-6175; 2527-8843

The study area is located at coastal and offshore Kundur and Adjacent Area, geographically located at coordinates of 0º 39'00 "0º 50'00" N and 103º 10'00 "103º 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 (5° - 8°), composed by medium to coarse sand, brownish yellow. The muddy beach has low relief (1° - 5°) where the edges of the beach is mangroves planted by the local peoples.