Distribution of Mineral Assemblages in Offshore Surface Sediments of <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:PlaceName w:st="on">Dalian</st1:PlaceName> <st1:PlaceType w:st="on">Bay</st1:PlaceType> in the Northwestern <st1:place w:st="on">North Yellow Sea</st1:place> and Their Provenance and Environmental Implications <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>

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line-level: 2" class=MsoNormal>weight: bold" lang=EN-US>Distribution of Mineral Assemblages in Offshore Surface Sediments of Dalian Bay in the Northwestern North Yellow Sea and Their Provenance and Environmental Implications

详细信息

责任者：Li Yan (Key Laboratory of Marine Geology and Environment ; Institute of Oceanology ; Chinese Academy of Sciences ; Qingdao 266071 ; China) ; Li Anchun
刊名：Marine Geology & Quaternary Geology
出版年：2009
卷期：29(4)
关键词：浅海沉积物 ; shallow-sea sediments ; 物源分析 ; provenance analysis ; 辽宁 ; Liaoning Province
页码：p.115-121
图表：7 illus., 19 refs.
分类号：0200
issnNo：ISSN0256-1492
isbnNo：CN37-1117/P

摘要

///Based on X-ray diffraction analysis of clay mineral compositions in the offshore surface sediments of Dalian Bay and Dayao Bay, together with separation and identification on light minerals, the assemblages and distribution characteristics of these minerals were studied. Their sources and sedimentary environments were discussed. The mineral distribution is obviously controlled by local topography. The coastal shallow-water slope in the north of the study area is characterized by enrichment of plagioclase, quartz and K-feldspar, and lower weight percentage of light minerals, indicating strong hydrodynamic conditions and nearby source. With water depth increasing southward to a submarine platform, there are high contents of chlorite, muscovite, rich clay and silt in sediments, and lower contents of plagioclase, quartz and K-feldspar, indicating weakened hydrodynamic conditions and far sediment source. Calcite is a characteristic mineral of Yellow River sediments and mainly distributed in the western study area, which illustrates that sediments in the western study area are partly from the Yellow River. According to the distribution patterns of chlorite, muscovite and clay, fine grained sediment zone in the middle of the study area is transported from east to west.

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