COMPARISON OF CORE SEDIMENT GRAIN-SIZE CHARACTERISTICS BETWEEN YANGTZE RIVER ESTUARY AND ZHOUSHAN ISLANDS AND ITS SIGNIFICANCE TO SEDIMENT SOURCE ANALYSIS
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摘要: 对取自长江口南槽口门南部和舟山群岛海域的8个柱状沉积物陆源碎屑进行了粒度分析,对比了其粒度特征。结果表明,除舟山群岛峡道的站位(ZSC7孔)样品外,其他各站位沉积物的粒度组成和粒度参数均表现出明显的相似性;利用粒度参数间的关系,可以判定舟山群岛外侧与长江口外沉积物中的陆源碎屑来源相近。在舟山群岛的峡道内,由于特殊的峡道沉积作用,形成了与其他海域明显相异的沉积物组成和粒度特征。研究认为,对于具较单一来源的临近海域沉积物,利用粒度数据可以较为简单地判断沉积物的物质"亲源性"。Abstract: We analyzed grain-size compositions of terrigenous fractions in 8 core sediments from the southern Yangtze River mouth and Zhoushan Islands area, and compared the grain-size characteristics between them by using the calculated grain-size parameters. The grain-size compositions and parameters of most of the core sediments from different sites and environments show very clear comparability, except for a core (ZSC07) from the inner part of the Zhoushan Islands. Further more, by using plots of mean grain size vs. sorting coefficient and grain size vs. standard deviation, we can easily know that the fine-grained terrigenous fractions in the core sediments all originate from the Yangtze River discharge. In the inner part of Zhoushan Islands, because of special hydrodynamic conditions and sedimentation processes in the strait channels, there developed very different sedimentation patterns with distinguished grain-size compositions and parameters. At last, we think that the grain-size composition data could be used to directly determine the sediment origins of different sedimentation environments but of the same sediment provenance.
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Keywords:
- source analysis /
- grain-size parameter /
- standard deviation /
- Zhoushan Islands
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