| 摘要: |
| 用多元成分数据统计分析中的端元估计算法，处理混合源沉积物地球化学数据，定量判识沉积物物源端元的化学成分和比例。将该方法应用于已知端元的人工数据，端元的化学成分和含量的估计值与已知值非常接近。实验结果说明，这种成分数据分析算法是定量判识沉积物物源端元的有效方法。用此方法处理冲绳海槽中段表层沉积物地球化学数据集，成功地定量估计出陆源物质、火山源物质和生物源物质的平均化学成分；同时定量计算出该区底质沉积物中陆源物质、火山源物质和生物源物质的百分含量。最后，将实算结果与矿物学判识的物源分布进行对比，二者总趋势一致，前者的局部变化大。此方法用于物源组成的定量估计工作，既经济又快速。 |
| 关键词: 物源端元 成分数据分析 地球化学数据 冲绳海槽 |
| DOI： |
| 分类号: |
| 基金项目:国家863计划资助项目，863-820-01-02号 |
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| METHOD OF ESTIMATING SEDIMENTARY END-MEMBERS AND ITS APPLICATION TO OKINAWA TROUGH REGION |
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DU De-wen,MENG Xian-wei,WANG Yong-ji,WU Jin-long
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First Institute Of Oceanography , State Oceanic Administration, Qingdao, 266003
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| Abstract: |
| The method of composition data analysis used in estimation origin end-members from submarine sediment is introduced here. The method is demonstrated for known end-members artificial data; the estimated error between known and estimated proportion of end-members is 7.8%, correlation coefficient between the known and estimated end-members is close to 1, and their compositions are almost the same. These results have shown that the method is efficient in estimating end-members from submarine sedimentary samples. Further, the method is used for submarine sedimentary datasets of the Okinawa Trough Region. Three origin end-members are identified from the datasets successfully. These estimated end-members represent continental, biologic and volcanic origin composition, respectively. Geochemical characters of the continental end-members are that SiO2, Al2O3, TiO2, Sr, Zr, Hf, and FREE are high, and CaO and CO2 are low in abundance; the biologic end-member has characters of high CaO and CO2 and low SiO2 and Al2O3 in abundance; the volcanic end-member is characterized by high Cu, Co, Ni, S and Cr contents. Estimated proportion range of continental, biologic and volcanic end members are 20.3%–81.2%, 3.6%–64.9% and 1.7%–38.1%, respectively. Estimated distribution figures of these end-members are presented in this paper too. The distribution of estimated end-members are compared with that obtained by traditional method — petrology and mineralogy method; they are similar in the mass, but the former contains more detail. The method is also adaptable for petrology, pedology and water pollution studies. |
| Key words: Sedimentary origin end-members, Composition data analysis, Geochemistry data, Okinawa Trough |
