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浙江大学学报（理学版）
浙江大学学报（理学版）  2020, Vol. 47 Issue (3): 345-354    DOI: 10.3785/j.issn.1008-9497.2020.03.012
地球科学     
西北太平洋表层沉积物地球化学特征及其物源指示意义
邱忠荣1, 马维林1, 张霄宇2,3, 董彦辉1, 章伟艳1, 杨克红1
1.自然资源部第二海洋研究所 自然资源部海底科学实验室，浙江 杭州 310012
2.浙江大学 地球科学学院， 浙江 杭州 310027
3.浙江大学 海洋研究院，浙江 舟山 316021
Geochemical characteristics of surface sediments in Northwest Pacific and their indication of material sources
QIU Zhongrong1, MA Weilin1, ZHANG Xiaoyu2,3, DONG Yanhui1, ZHANG Weiyan1, YANG Kehong1
1.Key Laboratory of Submarine Geosciences, MNR, Second Institute of Oceanography, MNR, Hangzhou 310012, China
1.School of Earth Sciences, Zhejiang University, Hangzhou 310027, China
1.Ocean Academy, Zhejiang University, Zhoushan 316021, Zhejiang Province, China
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摘要： 为深入了解西北太平洋表层沉积物地球化学特征及物质来源，对大洋40航次在西北太平洋马尔库斯-威克海山区采集的表层沉积物进行了全岩地球化学和黏土矿物测试分析。结果表明，研究区表层沉积物稀土元素（REE)平均质量分数为302.87×10-6，北美页岩标准化稀土配分模式与黄土相似，并具Ce轻微负异常和Eu无异常特征。稀土配分模式、判别函数（discriminant functions,DF）、M/I（蒙脱石/伊利石）及涂片鉴定等结果指示沉积物物源具有多源性，主要为陆源风尘物质，并受海洋自生物质的强烈影响，海山玄武岩及其蚀变产物和硅质生物也有一定的贡献。研究区沉积物稀土特征既不同于边缘海沉积物，也有别于远洋沉积物，而与弧后盆地沉积物类似。结合1/δCe-LREE/HREE和LREE/HREE-Y/Ho判别图解结果，研究区沉积物物源结构属性应介于边缘海沉积物与远洋沉积物之间，为洋陆过渡区沉积。
关键词： 西北太平洋;  表层沉积物;  黏土矿物;  地球化学;  物质来源    
Abstract: For a deep insight of the geochemical characteristics and material origins of surface sediments in Northwest Pacific，the measurements on whole-rock geochemistry and clay minerals were taken on the surface sediments collected during the DY-40 cruise in the Marcus-Wake Seamount of the Northwest Pacific. The results show that the average content of REE is 302.87×10-6，North American shale normalized REE pattern for samples are similar to that of loess with slightly negative Ce and positive Eu anomalies. The results of REE distribution patterns, discriminant functions（DF), M/I（montmorillonite/illite） and smear identification indicate that the samples show multiple material origins and are strongly influenced by the marine biomass, seamount basalts and their alteration products and siliceous organisms also have certain contributions. The REE characteristics of sediments in the study area are different from those of marginal sea sediments and pelagic sediments, similar to sediments in the back-arc basins. Based on the 1/δCe-LREE/HREE and LREE/HREE-Y/Ho discrimination plot, the sedimentary material source structure properties of the study area should be between marginal sea sediments and pelagic sediments,which is an ocean-continent transitional sedimentary property.
Key words: Northwest Pacific    surface sediments    clay minerals    geochemistry    material origin
收稿日期: 2019-03-14 出版日期: 2020-06-25
CLC:  P76  
基金资助: 国际海域资源调查与开发“十三五”课题（DY135-C1-1-05，DY135-N1-1-01，DY135-C1-1-02）；国家自然科学基金资助项目（41773005）.
通讯作者: ORCID: https://orcid.org/0000-0002-8957-5059, E-mail：maweilin308@sina.com.     E-mail: maweilin308@sina.com
作者简介: 邱忠荣（1994—），ORCID: https://orcid.org/0000-0002-7908-0319, 男，硕士研究生，主要从事海洋地质研究，E-mail:qiuzhongrong@sio.org.cn.
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引用本文:

邱忠荣, 马维林, 张霄宇, 董彦辉, 章伟艳, 杨克红. 西北太平洋表层沉积物地球化学特征及其物源指示意义[J]. 浙江大学学报（理学版）, 2020, 47(3): 345-354.

QIU Zhongrong, MA Weilin, ZHANG Xiaoyu, DONG Yanhui, ZHANG Weiyan, YANG Kehong. Geochemical characteristics of surface sediments in Northwest Pacific and their indication of material sources. Journal of Zhejiang University (Science Edition), 2020, 47(3): 345-354.

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https://www.zjujournals.com/sci/CN/10.3785/j.issn.1008-9497.2020.03.012    或    https://www.zjujournals.com/sci/CN/Y2020/V47/I3/345

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