| 冲绳海槽中段表层沉积物物质来源的定量分离:Sr-Nd同位素方法 |
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| 引用本文： | 孟宪伟,杜德文,吴金龙.冲绳海槽中段表层沉积物物质来源的定量分离:Sr-Nd同位素方法[J].海洋与湖沼,2001,32(3):319-326. |
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| 作者姓名： | 孟宪伟 杜德文 吴金龙 |
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| 作者单位： | 国家海洋局第一海洋研究所 |
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| 基金项目： | 国家自然科学基金!资助项目，4 970 60 68号，国家自然科学重点基金!资助项目，4 973 62 1 0号 |
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| 摘 要： | 利用1994年85－904航次获取的冲绳海槽中段表层沉积物样品，测定其硅酸盐相的^87Sr/^86Cr和^143Nd/^144Nd比值，以定量研究冲绳海槽中段表层沉积物硅酸盐物质的来源，结果表明，冲绳海槽中段陆坡区表层沉积物硅酸盐相的^87Sr/^86Sr/^143Nd/^144Nd与东海陆架沉物硅酸盐相的^87Sr/^86Sr和^143Nd/^143Nd相当，槽底和东坡沉积物硅酸盐相的^87Sr/^86Cr和^143Nd/^144Nd值介于中国大陆硅酸盐物质和海槽水山碎屑的^87Sr/^86Sr,^143Nd/^144Nd比值之间，并大致具有两端员混合特征，利用以Sr同位素为参数的二端员混合方程进行物源定量分析的结果表明，冲绳海槽中段的西坡和槽底表层沉积物硅酸盐相以陆源物质为主，最大值为91．07％，由西向东，陆源物逐渐减少，在海槽东坡含量最小，最小值为9．93％，火山源物质在东坡含量最高，量大值为64．92％，由东向西，由北向东，火山源物质逐渐减少为零。
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| 关 键 词： | 冲绳海槽 物质来源 锶同位素 钕同位素 定量分离 表层沉积物 |
| 收稿时间： | 1999/12/18 0:00:00 |
| 修稿时间： | 1999年12月18 |
QUANTITATIVE PARTITION OF MIXED SURFACE SEDIMENTS FROM THE MIDDLE OKINAWA TROUGH INTO THEIR END-MEMBERS USING Sr-Nd ISOTOPE |
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| MENG Xian Wei,DU De Wen and MENG Xian Wei,DU De Wen,WU Jin Long.QUANTITATIVE PARTITION OF MIXED SURFACE SEDIMENTS FROM THE MIDDLE OKINAWA TROUGH INTO THEIR END-MEMBERS USING Sr-Nd ISOTOPE[J].Oceanologia Et Limnologia Sinica,2001,32(3):319-326. |
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| Authors: | MENG Xian Wei DU De Wen and MENG Xian Wei DU De Wen WU Jin Long |
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| Institution: | First Institute of Oceanography, State Oceanic Administration; Key Laboratory of Marine Science and Numerical Modeling, State Oceanic Administration, Qingdao, 266003;First Institute of Oceanography, State Oceanic Administration; Key Laboratory of Marine Science and Numerical Modeling, State Oceanic Administration, Qingdao, 266003;First Institute of Oceanography, State Oceanic Administration Qingdao, 266003 |
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| Abstract: | Provenance of sediments from the meddle Okinawa Trough has always been a focused problem, for which, many researches have conducted in terms of the mineralogy and geochemistry. However, none of them is not concerned with quantitative partition of mixed sediments according their endmembers. In the present paper, the provenance of mixed surface sediments from the middle Okinawa Trough is discussed using Sr and Nd isotopes, on the basis of which the sediments are partitioned into endmembers using strontium isotope. It is shown that the 87 Sr?/ 86 Sr and 143 Nd?/ 144 Nd ratios of silicate facies in mixed sediments of the western slope from the middle Okinawa Trough are equal to those of silicate facies in the sediments from the East China Sea shelf. 87 Sr?/ 86 Sr and 143 Nd?/ 144 Nd ratios of silicate detritus in the sediments from the bottom and eastern slope of the middle Okinawa Trough are between those from China's land and those of volcanoclastic materials of the Okinawa Trough, demonstrating the nature of two end member mixture. Quantitative partition illustrates that sediments from the bottom and eastern slope of the middle Okinawa Trough are dominated by terrigenous detritus, maximum content accounting for 91 07%. Terrigenous detritus gradually decreased from the west to the east, and minimium content is located on the eastern slope, accounting for 14%. Oppositely, volcanic detritus has a maximium on the eastern slope, accounting for 64.92%; it gradually decreases to zero to wards the west. |
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| Keywords: | Middle Okinawa Trough Provenance of sediments Sr Nd isotopes Quantitative partition |
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