冲绳海槽中部沉积物物质来源和沉积环境分析

张丹丹; 曾志刚; 殷学博

doi:10.3969/j.issn.0253-4193.2017.07.009

冲绳海槽中部沉积物物质来源和沉积环境分析

doi: 10.3969/j.issn.0253-4193.2017.07.009

1.
中国科学院海洋研究所海洋地质与环境重点实验室, 山东青岛 260071;青岛海洋科学与技术国家实验室海洋矿产资源评价与探测技术功能实验室, 山东青岛 266061;中国科学院大学, 北京 100049
2.
中国科学院海洋研究所海洋地质与环境重点实验室, 山东青岛 260071

基金项目: 国家重点基础研究发展计划（973计划）项目（2013CB429700）；中国科学院战略性先导科技专项（XDA11030302）；国家自然科学基金项目（41325021）；泰山学者工程专项（ts201511061）；青岛海洋科学与技术国家实验室‘鳌山人才’计划项目（2015ASTP-0S17）；青岛海洋科学与技术国家实验室鳌山科技创新计划项目（2015ASKJ03）。

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出版历程
- 收稿日期: 2016-10-08
- 修回日期: 2016-12-15

Analysis on sediment provenance and environmental changes in the middle Okinawa Trough

1.
Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266061, China;University of Chinese Academy of Sciences, Beijing 100049, China
2.
Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China

摘要

摘要: 本文基于AMS¹⁴C高精度测年，通过对柱状沉积物HOBAB2-S2的粒度、微量元素和稀土元素的分析，对冲绳海槽中部区5 300 a以来的物质来源和沉积环境进行了研究。通过对该孔的稀土元素与微量元素的研究发现研究区沉积物质具有陆源属性，并且通过不同物源区沉积物的稀土元素散点图表明5 300 a以来沉积物主要来自于台湾。文中将粒度特征作为研究区域沉积环境，尤其是水动力（黑潮）强弱的指示参数，根据粒度变化曲线，可将沉积过程分为4个阶段：第一阶段（5.30~3.81 ka BP），粒径由粗变细，黑潮强度逐渐减小；第二阶段（3.81~2.70 ka BP），粒径波动较大，无明显增大或减小趋势，表明沉积环境处于相对波动状态，水动力强弱不稳定；第三阶段（2.70~0.97 ka BP），粒径变化较小，表明沉积环境处于相对稳定状态，研究区的水动力条件较稳定；第四阶段（从0.97 ka BP至今），粒径逐渐变粗，水动力条件增强。
- 冲绳海槽 /
- 物质来源 /
- 微量元素 /
- 粒度 /
- 沉积环境
Abstract: Based on the data of grain size and trace elements coupled with high-precise AMS¹⁴C dating, this paper dealed with the provenance and sediment environment evolution of the middle Okinawa Trough for the last 5 300 a with the sample from the Core HOBAB2-S2. The analysis on REE and trace elements showed their affinities to the terrigenous sediments in the study area. In combination with REE parameters of potential sediment sources, the sediments were mainly originated from Taiwan. The grain size was used to be the indicators of sediment environment, especially the vigor of local current(the current was mainly referred to Kuroshio Current in this paper). The conclusions were summarized as follows. Four periods were divided. During the first period(5.30-3.81 ka BP), grain size was getting finer, which indicated the Kuroshio Current weakened gradually. In the period of 3.18-2.70 ka BP, the garin size showed distinct change and we can deduce that the sediments suffered a relative volatility period. During the third period, from 2.70 ka BP to 0.97 ka BP, the environment was stable inferred from the grain size with little changes. Since 0.97 ka BP, the sediments grain size was larger than before and indicated the enhance of the strength of Kuroshio Current.
- Okinawa Trough /
- provenance /
- trace elements /
- grain size /
- sediment environment

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