STUDY OF DELTA SEDIMENT DEPOSITS AT THE CITARUM RIVER MOUTH, BEKASI REGENCY, WEST JAVA
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Abstract
Delta Muara Bendera is a meeting place between the Citarum river and the North coast of Northwest Java Basin which is known as one of the producers of hydrocarbons on the island of Java. The purpose of this study was to determine the relationship between environmental morphology, sediment characteristics, and microfauna characteristics found at the mouth of the Citarum River. The methods used during this study were field sampling, satellite imagery analysis, stratigraphic column analysis, granulometric analysis, hydrometric analysis, and foraminifera analysis.
Based on satellite imagery analysis. It is divided into 3 morphological sections namely: Delta Plain, Delta Front, and Pro Delta. Stratigraphic column analysis on sample codes CDAF 1 to CDAF 5, the sediment characteristics are interbedded sediments from carbonic mud at the bottom to siliciclastic mud at the top. The carbonic mud in this sample is rich in organic material, there are also plant fragments such as roots, leaf bones, and twigs. The CDAF 6 to 10 have similarities with the previous samples but there are differences with high activity of bioturbation in sediment layer. CDAF 11 to 15 show a deltaic deposition pattern in the form of a fine and coarse pattern in sediments with a range of silt grains to medium sand. Sediment grain analysis in the sand fraction showed the presence of fine sand grains with moderate sorting, based on microscopic observations of sand grains having rounded roundness and low sphericity. Analysis of the mud fraction showed medium sand to medium silt, based on the overall sample the percentage of the fine sand fraction in the sample only had less than 60%. Benthic foraminifera found on research area has dominated by genus Ammonia
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