GEOCHEMISTRY OF REE IN SEDIMENTS OF CORE QDZ03 OFF SOUTHERN SHANDONG PENINSULA AND ITS IMPLICATIONS FOR PROVENANCE
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摘要: 对最近在山东半岛南部滨浅海区获得的全取心QDZ03孔做了稀土元素地球化学分析,探讨了稀土元素组成特征和钻孔沉积物物质来源。根据钻孔稀土元素的垂向变化特征,并结合沉积物粒度、颜色、测年等其他指标,QDZ03孔可分为5段,包括2个海相段和3个陆相段,海相段的稀土元素总量略大于陆相段。钻孔稀土元素总量为83.87~219.26 μg/g,平均值为167.55 μg/g,与北美页岩平均值相当,高于上部地壳和黄河沉积物平均值。通过稀土元素配分模式、Ce-La元素的DF判别函数及LREE/HREE与ΣREE关系分析认为,钻孔沉积物物质来源在晚更新世前后发生了一定的变化,在晚更新世前,物源可能是混合源或受到后期环境改造影响较大,晚更新世以后,钻孔沉积物主要受到五龙河和黄河沉积物的影响,尤其是近2 000 a以来,钻孔沉积物物质与黄河沉积物接近程度最高。Abstract: With the data of rare earth elements (REE) of the sediments from the core QDZ03 acquired off the southern Shandong Peninsula recently, we discuss the REE composition and its bearing on provenance of the sediments in this paper. According to the vertical change in REE, grain size and color with age, the core QDZ03 can be divided into 5 segments, including 2 marine and 3 continental segments. The total of REE in the marine is higher than that in the continental facies. The total REE of the core changes between 83.87~219.26μg/g, with an average at 167.55μg/g, which is the same as the north American shale, but higher than those of the upper crust and the Yellow River sediment. Based on the distribution patterns of REEs,using the D/F discrimination function of Ce-La and correlation of LREE/HREE and ΣREE, we infer that the source of core QDZ03 has an obvious change before and after late Pleistocene. Before late Pleistocene, there might be a mixed-source or the sediments have affected by the later environment. The main source after late Pleistocene is mainly from the Yellow River and the local small rivers, especially for the deposits of recent 2000 yr, which are close to the Yellow River sediment.
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Key words:
- rare earth elements /
- provenance /
- core QDZ03 /
- Shandong Peninsula
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