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Study on the Sedimentary Environment Evolution of Kushuiyang Eastern Sandy Ridge Since the Late Pleistocene, Jiangsu Offshore, Southern Yellow Sea

Author: LiuQun
Tutor: YinYong
School: Nanjing University
Course: Marine Geology
Keywords: Accumulation type tidal sand ridges Sedimentary facies The evolution of the sedimentary environment
CLC: P736.21
Type: Master's thesis
Year: 2011
Downloads: 88
Quote: 3
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Abstract


South Yellow Sea radial sand ridges save changes and accumulation of land and sea continental shelf evolution since the Late Quaternary history. Sand ridges layer internal implicit Quaternary sea-level change, land and sea interactions, climate change and environmental evolution of the wealth of information is the best carrier to study the changes in the marine environment following the polar ice cores, deep-sea sediments and loess accumulation. Radial sand ridges giant pile of the Yellow River, the Yangtze River two rivers in the western Pacific marginal seas, is a typical product of the interaction between land and sea. Grievances ocean east side of the sand ridge large sand ridges of sand ridges northeast trend bulk-South Yellow Sea radiation research since the late Pleistocene and evolution of sedimentary environment, genetic mechanism, is of great significance for understanding the dynamic changes of the entire radial sand ridges. Radiation in the Southern Yellow Sea in January 2008 the sand ridges grievances ocean east side sand ridges implemented 07SR04 hole (33 ° 27.178 'N, 122 ° 5.617' E) coring work. This hole footage depth of 30.8m, the actual core length of 24.8m, coring rate of 80.5%. By indoor the drilling described and lithology catalog based on the need to collect, including particle size, magnetic susceptibility, mineral, dating, foraminifera identification of the required samples, combined with the sedimentary facies paragraph conducted a comprehensive analysis of the evolution of its long cycle. Sediments are silty clay, clayey silt, fine sand and silt, and silt particle size from the bottom up, from the entire core of view, the gradual coarsening trend. Mainly light minerals (quartz, feldspar), heavy mineral content to the highest content of hornblende, epidote followed. Silt average content of 52.7%, followed by sand, the average content of 40.9%, the average clay content of 6.4%. The average particle size of the sediment cores fluctuated between 1.85 ~ 6.5Φ average 4.7Φ. Lithology, grain size, sedimentary structures, bottom-up, divided into the holes sediment four sedimentary facies paragraph: (1) Coastal Plain (hole depth of 30.80-22.75m): yellowish brown silty clay mainly foraminifera abundance greatly reduced, single species, littoral and shallow marine color. Contains a large number of local authigenic pyrite, the representatives appeared restore environment. (2) tidal flat phase (hole depth 22.75-20.44m): sediment mainly olive black silty clay, shell fragments into segments accumulation of the clay layer, the mixed deposition. This layer exists chronological interval, the judge may have a lack of formation. There is a clear depositional environment marked the gorgeous Blue clams (Corbicula leana Prime) and box cockles (undetermined species) debris environment as tidal flat phase. (3) shallow marine, estuarine (hole depth 20.44m-9.42m): sediments mainly silty clay, clayey silt, more obvious erosion interface between the layered, bottom-up by the fluctuations deeper water shallow marine subtidal shallow marine to stable, the upper part of the re-deposition of the sediments of shallow water fluctuations subtidal zone. Two cycles sedimentary sequence, typical of shallow marine sedimentary facies. Foraminifera highest abundance, typical of shallow marine foraminifera A.beccarii-Elphidium sp. Combination, this layer formed between 4290-2005a BP. Tidal sand ridge phase (hole depth of 9.42-0m): (4) sediments mainly fine sand and silt, clayey silt, light olive gray, the color of the main particulate matter up gradually thicken. Oblique bedding the massive sands white sands and biological development burrows. 450cm at the obvious erosion interface, this section is divided into upper and lower parts of the tidal sand ridge, the lower shale content, on behalf of the body of water is also deep; upper sand of argillaceous sediments body or aggradational sequence . Water power from the bottom up weakened. Probability cumulative to a double hop characterized by the degree of, reflecting the the Fluctuations trend reciprocation. Cm Figure distribution area is consistent with the modern tidal sand ridges. The magnetic susceptibility variations in this layer.

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CLC: > Astronomy,Earth Sciences > Oceanography > Marine basic science > Marine geology > Marine deposition,the history of oceanography > Marine sedimentary
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