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Analysis of Sedimentary Characteristics and Provenance of Surficial Sediments on the West South Yellow Sea

Author: XuGang
Tutor: LiAnLong；LiuJian
School: Ocean University of China
Course: Marine Geology
Keywords: Western South Yellow Sea shelf Granularity Clay minerals Element geochemistry Sedimentary features Provenance analysis
CLC: P736.21
Type: Master's thesis
Year: 2010
Downloads: 189
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Abstract

This study area is located in the western waters of the Southern Yellow Sea, geographic coordinates 33.5 ° -36 ° N, 119 ° -122 ° E. Explore the sedimentary characteristics of the study area and material sources, the modern sediment dynamic process and evaluation rivers understanding of the continental shelf of great significance to the role of the ocean. Therefore, the testing and analysis of the granularity of clay minerals and elemental geochemical seabed surface sediment samples in the study area, and the combination of the above indicators of the depositional environment of the study area, sedimentation and provenance discussed. Granularity test submarine surface sediments in the study area, 486 laser particle size analyzer. The results showed that the sediment types in the region in accordance with the classification of Folk (1970), gravel, silt, sandy silt, silty sand and mud, the local sea sand, sandy clay, sandy silt and silt quality sand for the local distribution of the most widely used type of sediments. The depositional environment of the study area and sediment provenance is a major factor in the control of surface sediment grain size characteristics. 486 surface sediment samples of the study area, chemical testing and analysis of major elements and trace elements. The results show that many of the elements in the surface sediments have similar geochemical behavior in the supergene geochemical environment, basically follow the \Main elements Al, Ti, Fe, Mg, and most of the elements the correlation is high, indicating that the material sources with unity. Trace elements Li, V, Cr, Co, Ni, Zn elements showed a significant linear relationship, indicating that they have similar geochemical behavior. REE patterns on chondrite-normalized curve significantly rightist relatively enriched in light rare earth elements reflect sediment moderate negative Eu anomalies. North American shale and the upper continental crust distribution curves were nearly flat, curve no obvious Eu anomaly, Ce anomalies were not evident. 482 surface sediment samples were selected in the study area, clay mineral analysis by X-ray diffraction. The analysis results show that the type of clay mineral assemblages of the study area is mainly illite - smectite - chlorite - kaolinite, a combination of the type of the same type as the Yellow River clay mineral assemblages. Several typical cores in the study area, shallow surface deposition characteristics of the study area was analyzed and discussed. The results indicate that the the Haizhou Bay the calcareous concretions gravel formation in the late Pleistocene and Holocene transgression period of erosion and exposed on the sea floor late due to the transformation of the hydrodynamic and mixed new material. Study area silty sand and sand the granularity parameter has the characteristics of high-energy band of the shore, and the formation of early Holocene coastal environment. The 1128-1855 Yellow River into the sea from northern Jiangsu, the formation of a large-scale old Yellow River Delta in northern Jiangsu, part of which covers the Holocene transgression during the formation of residual sand on top of. Limited data analysis, this article infer study area northeast sandy silt the underwater wedge the end of the Shandong Peninsula deposition body, the thickness is only about 25Cm sandy silt covering residues formed in the early Holocene sand top . Finally, this article indicates the role of the provenance of the clay minerals, elemental ratios, the chondrite-normalized curve, stepwise discriminant analysis, discriminant function, and carbonate provenance indicates the role of the source of the material of the surface sediments of western South Yellow Sea shelf area discussed, the results show that the western South Yellow Sea continental shelf waters of the main material source of the Yellow River transport of substances. Carry from the modern Yellow River substances; Subei Huang estuary accumulation body substances transported from eroded stream by the Yellow Sea coast, the two substances are related with the Yellow River. In addition, the northeastern part of the study area and Lianyungang Nearshore substances may also be eroded bedrock material and adjacent waters inshore of the impact of the erosion of bedrock material.

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