| 太平洋东部CC48孔沉积物稀土元素地球化学研究 |
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| 引用本文： | 刘季花,张丽洁,梁宏峰.太平洋东部CC48孔沉积物稀土元素地球化学研究[J].海洋与湖沼,1994,25(1):15-22. |
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| 作者姓名： | 刘季花 张丽洁 梁宏峰 |
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| 作者单位： | 地质矿产部海洋地质研究所!青岛，266071，地质矿产部海洋地质研究所!青岛，266071，地质矿产部海洋地质研究所!青岛，266071 |
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| 基金项目： | 国家自然科学基金!49070263 |
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| 摘 要： | 研究样品于１９８８年采自太平洋东部ＣＣ４８孔。通过对沉积物稀土元素地球化学特征的分析发现：（１）各种类型深海沉积物的稀土含量有所差别，以稀土元素总量而论，深海粘土＞硅质软泥＞硅钙质软泥＞钙质软泥；沉积物中的自生矿物、硅质生物成因的非晶质ＳｉＯ２及碎屑矿物对稀土元素起富集作用，而生物ＣａＣＯ３则起分散作用。（２）稀土元素含量随深度发生变化。为地层划分提供了依据，应用元素地层学方法将岩芯分成５个层段。
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| 关 键 词： | 地球化学 沉积物 太平洋 稀土族 |
| 收稿时间： | 1991/8/20 0:00:00 |
| 修稿时间： | 1993/4/14 0:00:00 |
THE REE GEOCHEMISTRY OF SEDIMENTS IN CORE CC48 FROM THE EAST PACIFIC OCEAN |
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| Liu Jihu,Zhang Lijie and Liang Hongfeng.THE REE GEOCHEMISTRY OF SEDIMENTS IN CORE CC48 FROM THE EAST PACIFIC OCEAN[J].Oceanologia Et Limnologia Sinica,1994,25(1):15-22. |
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| Authors: | Liu Jihu Zhang Lijie and Liang Hongfeng |
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| Institution: | Institute of Marine Geology, Ministry of Geology and Mineral Resources, Qingdao 266071;Institute of Marine Geology, Ministry of Geology and Mineral Resources, Qingdao 266071;Institute of Marine Geology, Ministry of Geology and Mineral Resources, Qingdao 266071 |
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| Abstract: | The studies of the REE geochemistry of sediments of core CC48 taken from the East Pacific Ocean, revealed that (1) Vertically downward, the sediments of core CC48 change from pelagic clay to siliceous ooze to calcareous ooze to silicalcareous ooze. The REE contents were distinct in different types of sediments. Clay had the highest REE concentration, calcareous ooze the lowest. There were strong relationships between the REE contents and authigenic minerals such as smectite, phillipsite and barite and detrital plagioclase and biogenic amorphous SiO2, CaCO3. They,except CaCO3, have major roles in REE enrichment. (2) The sharp changes of the REE contents in depth divided core CC48 into 5 layers that provided information for deep sea stratigraphic division. (3) The REE fractionation such as nagtive Ce anomaly, Eu anomaly and the fractionation between light REE and heavy REE (La/Lu)sh show that three types of sedimentary environments existed since early Miocene (above CCD, below CCD and near CCD). The Ce depletion (La/Ce)sh showed that,in early Miocene, sedimentary redox coditions changed in three cycles that reflect the cyclic changing of paleoclimate and the effects of AABW. |
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| Keywords: | Rare earth element Geochemistry Sediment Paleoceano-graphic environment East Pacific Ocean |
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