长江口及邻近陆架沉积物中Pt、Pd分异的物源示踪

张霄宇; 张富元; 高爱根; 章伟艳

长江口及邻近陆架沉积物中Pt、Pd分异的物源示踪

1.
浙江大学地球科学系, 浙江杭州 310027
2.
国家海洋局海底科学重点实验室，浙江杭州 310012

基金项目:

国家科学技术部科技基础性工作专项 2006FY220400

国家自然科学基金青年基金项目 40706057

浙江省自然科学基金项目 Y506205

详细信息

作者简介:
张霄宇(1972-), 女, 博士﹐副教授, 主要从事地球化学的教学和科研工作.E-mail: zhang_xiaoyu@zju.edu.en

中图分类号: P588.2
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出版历程
- 收稿日期: 2008-06-03
- 刊出日期: 2009-07-25

Source Tracing Implication of Pt and Pd Fractionation in the Surface Sediment of Continental Shelf around Changjiang Estuary

1.
Department of Earth Sciences, Zhejiang University, Hangzhou 310027, China
2.
Key Laboratory of Submarine Geoscience, State 0ceanic Administration, Hangzhou 310012, China

摘要

摘要: Pt/Pd比值在研究区分布呈显著的区域特征.南黄海沿岸流输送物质以Pt/Pd > 1为特征, 为古黄河三角洲来源; 长江流域来源物质以Pt/Pd≤1为特征.长江物源组分的影响范围广, 在125°E、33°N沉积物中还能发现受长江物质的明显影响.除了源岩中Pt、Pd分配因素外, 黄河和长江流域不同类型和程度的风化作用对沉积物中Pt、Pd分异起着关键的控制作用.虽然沉积物中氯含量、粒度效应在一定程度上影响着Pt、Pd分布, 但是没有造成显著的Pt、Pd分馏.Pt/Pd≤1区域中元素组成和长江沉积物的组成特征一致, 呈现比较强的硅质风化作用; Pt/Pd > 1区域沉积物中的元素组成和黄河沉积物一致, K/Na-Rb/Sr图解显示古黄河物质在再侵蚀、搬运和沉积过程中化学成分进一步分异.
- 黄海东海陆架 /
- 沉积物 /
- 铂族元素 /
- Pt/Pd /
- 物源示踪 /
- 沉积学
Abstract: Over the past decades extensive studies on the sediment source tracing and transporting routine of Yellow Sea and East China Sea have been carried out but not yet resolved completely.The present research suggests Pt/Pd ratio is a promising index to distinguish sediments transported from Changjiang and those from Huanghe drainage basins.The erosive sediment of old Huanghe Delta transported by southern Yellow Sea coastal current is characterized by Pt/Pd > 1;land source sediment carried by Changjiang River was characterized by Pt/Pd≤1.The two unique weathering regime in the Chanjiang and Huanghe drainage basins was the key factor causing the fractionation of Pt and Pd in the sediment.The element composition in the sediment of Pt/Pd≤1 corresponds well with that of Changjiang sediments, and the element composition in the sediment of Pt/Pd≤1 is in accordance with that of Huanghe sediments.The K/Na-Rb/Sr diagram suggests that the chemical composition of land source sediment varied during re-erosion and re-transportion and re-sedimentation.
- Yellow Sea and East China Sea /
- sediment /
- PGE /
- Pt/Pd /
- source tracing /
- sedimentology.

HTML全文

图 1 研究区域采样站位分布示意

Fig. 1. The location of sampling stations

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图 2 研究区域内Pt/Pd比值分布趋势

Fig. 2. Distribution tendency of Pt/Pd ratio in the research area

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图 3 Pt/Pd≤1区域沉积物中铂、钯和氯的相关性分析

Fig. 3. Relationship between Pt and Cl, Pd and Cl in the sediment of Pt/Pd≤1

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图 4 研究海域粘土、粉砂、砂的分布趋势

Fig. 4. Distribution of clay, silt and sand in the research area

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图 5 Pt/Pd比值和粒度相关性分析(以Pt/Pd≤1的长江口区域为例)

●表示粘土; ■表示粉砂; ▲表示砂

Fig. 5. Relationship analysis between grain size and Pt/Pd ratio of Pt/Pd≤1

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图 6 分区内各个元素的分配

Fig. 6. Allocation of different elements between two areas

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图 7 沉积物中K/Na-Rb/Sr图解

口表示Pt/Pd: 表示Pt/Pd≤1区域; ■表示Pt/Pd>1区域; ●表示长江沉积物; ○表示黄河沉积物; ▲表示黄土; ★表示北美页岩平均; ☆表示中国沉积物平均; 底图来自Yang et al.(2004)

Fig. 7. Diagram of K/Na-Rb/Sr of sediments

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表 1 铂族元素数据检测评价参数(ng/g)

Table 1. Parameters describing the analytical quality of the PGE data

表 2 研究区域内沉积物中各类元素含量特征值

Table 2. Elemental concentrations in sediments

表 3 主要地质赋存体中Pt.Pd含量和Pt/Pd比值分布

Table 3. Concentration of Pt and Pd and Pt/Pd ratio

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